Subgrade material specification

Material Specification for Aggregates - Base, Subbase

3.1.5 Dispose of material in accordance with Section 3.4 of CW 1130. 3.2 Excavation 3.2.1 Excavate site material to the depth that accommodates the pavement structure as shown on the Drawings or as directed by the Contract Administrator. 3.2.2 Stockpile suitable sub-grade material and suitable site sub-base material at locations on sit This specification covers the material requirements for aggregates for use in base, subbase, select subgrade, granular surface, shouldering, and backfill material. Page 1 Rev. Date: 11/2013 OPSS.MUNI 101

The type of soil (or subgrade material) determines the type of equipment needed for compaction: Cohesive soils need to be sheared to get compaction, so you need a machine that has high impact force. A rammer is the best choice, or for bigger jobs, a pad-foot roller (similar to a sheepsfoot roller) The subgrade is the soil that is at the bottom of the slab system. It can be the native soil or fill brought in from elsewhere §733-05 through Specification §733-07 and Specification 19 §are 733-being assigned the material specifications related to recycled materials that may be used as an alternate to a granular subbase material. §733-08 through Specification Specification 733-16 are being § assigned the material specifications related to earthwork

Special Specification for Subgrade and Foundation

Specification of material which is used in subgrade INDOT Subgrade Standard Specification & ITM Updates Construction Conference, 2021 Nayyar Siddiki 219.02 Materials • Subgrade shall have minimum unconfined compressive strength of 300 psi at 7 days. (AASHTO T 208

Design Guide for Subgrades and Subbase

Subgrade materials are typically characterized by (1) their resistance to deformation under load, in other words, their stiffness or (2) their bearing capacity, in other words, their strength. In general, the more resistant to deformation a subgrade is, the more load it can support before reaching a critical deformation value Characteristics of materials used in Sub Base: The subgrade material should be clean and free from organic matter and should be able to be compacted by roller, to form stable sub-base. The material should have following characteristic. Well graded uniformity coefficient (D60/D10) should not be less than 3 Material Specification for Aggregates - Base, Subbase, Select Subgrade, and Backfill Material Page 3 of 8 TS 1010 - September 2017 . Subsection 1010.05.02 of OPSS.MUNI 1010 is amended by the addition of the following clause: OPSS 1010.05.02.03 Granular A RAP . Granular A RAP produced from reclaimed asphalt pavement material 1601 Description. Stabilize designated portions of the roadbed to provide a firm and unyielding subgrade, having the required bearing value specified in the plans

Soils containing greater than 3 % by dry weight calcium, magnesium carbonate, or organic material, or with a maximum dry density of less than 100 lb/ft3, or with liquid limit of greater than 50, are not allowed within the specified thickness of the subgrade. Density is determined in accordance with AASHTO T 99 and loss of ignition is determined in accordance with AASHTO T 267.Liquid limit is determined in accordance with AASHTO T 89 2.7 Blanket: Blanket is a layer of specified coarse, granular material of designed thickness provided over full width of formation between subgrade and ballast. 2.8 Prepared Subgrade:In case of two layer system, it is provided over the subgrade and below the blanket layer with a view to economise the thickness of blanket layer Before adding lime, the subgrade material to be treated is scarified, pulverized, mixed, and windrowed or re-laid. It may be necessary to remove oversize material (see Standard Specification Subsection 301-3.01). Windrows should be sized so that the mixer can easily process all the material at once. This may mean that several windrows will be. Aggregate subbase is designated by class. The Bid Item List and plans specify the class of aggregate subbase, and the Standard Specifications and special provisions provide the requirements for each class. Aggregate subbase is usually the lowest layer in the pavement structure, as shown in the typical cross sections of the contract plans 9.22 DESIGN SUBGRADE CROSS SECTION .1 Design subgrade cross section shall mean the surface of the finished subgrade upon which select granular sub-base material is to be placed. 9.23 OVERBURDEN .1 Overburden shall mean the surface material which, in the opinion of the Engineer, is not suitable for classifying as topsoil or earth fill

Subgrades & Subbases for Concrete Slabs - The Concrete Networ

The work shall consist of Construction of Sub-grade with approved and specified materials obtained from approved borrow areas or suitable material obtained from roadway excavation and drain excavation and in accordance with clause 305 of MORT&H specification. 2.0 Reference: - Reference Documents:-Ministry of Road Transport & Highway. Although these materials can be graded and compacted to a uniform and level subgrade surface, this surface should receive further treatment by the application of a finer material, such as sand, to form a cushion or bedding for the lining system. The bedding material should be a minimum of 150 mm (6) thick and should be compacted

Base and subgrade materials are treated with chemical additives to achieve one or more goals when available materials do not meet project-specific requirements. Reasons for treatment include the following: increase strength to provide long-term support for the pavement structure, reduce the required pavement thickness Compaction Specification for the Control of Pavement Subgrade Rutting HaNr A. Lorrr, Cnenrns W. ScnwARTZ, aNo MarrHEw W. Wrrczex Soil compaction is a primary measure for controlling perma. nent deformations of pavement subgrade materials. Major parameters in any compaction specification include the com Section 3 Specification 3.1 Subgrade Preparation 23 APR 2001 1 3.1 SUBGRADE PREPARATION 3.1.1 GENERAL Description Subgrade shall be considered as the soil surface on which a subsequent layer or layers of base course, gravel surfacing, surface treatment, pavement or other material is to be placed. Prior to the deposition of an 2004 Specifications CSJ 0009-11-210, etc. SPECIAL SPECIFICATION . 2006 Moisture Treated Subgrade . 1. Description.The purpose is to provide a layer of low swelling, strain absorbing material 260 - LIME TREATMENT FOR MATERIALS USED AS SUBGRADE (ROAD MIXED) SPECIFICATION REQUIREMENTS 1) Limits must be shown on the plans. 2) Width, depth and number of courses must be shown on the typical section(s). 3) Specify the type or types of lime to be used on the plans

The finished material shall comply with specification requirements. 302.03 Construction Requirements. The selected material shall be placed on a completed and approved subgrade substantially conforming to the grades and cross section shown on the plans. The subgrade shall be prepared as specified in Section 212, an Specification for Cement-Stabilized Subgrade Soils 42 1. General 42 2. Referenced Documents 42 3. Submittals 42 4. Materials 42 5. Equipment 42 6. Construction Requirements 43 7. Inspection and Testing 44 8. Measurement and Payment 44 Appendix B. Mix Design Swell Test Method for Soil Treatment Using Additives (Cement or Other) 45 Section 1. Selection of steel quality (sub-grade) for material toughness is covered by EN 1993-1-10[1], its UK NA[2] and PD 6695-1-10[3]. 1.2 Risk factors in brittle fracture Since brittle fracture of an individual component depends on factors that cannot be precisely known - actual material toughness, actual flaw size, actua of the quantity of material needed and identification of borrow sites or other known sources of material should be included in the specifications. If subgrade material is needed and has to be hauled to the pond site, the inclusion of the bid item will help avoid an unexpected cost increase for hauling subgrade material

SPECIFICATION REQUIREMENTS. 1) Specify aggregate type and grade on the plans. 2) Do not use additives such as but not limited to lime, cement, or fly ash to modify aggregates to meet the requirements of Table 1, unless shown on the plans. 3) Material Type E will be as shown on the plans. 4) Grade 4 material requirements will be as shown on the. AustStab Model Specification for insitu stabilisation of subgrade materials using lime for main roads 1 General The purpose of this specification is for the construction of new or existing subgrades or pavement materials for main roads by insitu stabilisation with quicklime or hydrated lime. Incorporation of the binder shall b The proposed thickness & specifications of blanket material, subgrade layers along with design methodology of formation design for axle loads 25t to 32.5t shall provide a fillup for present formation design adoption on Dedicated Fright Corridor Routes, Feeder Routes and new construction of HDN routes on IR suggestions are given for application to design and specifications of the classification data: (1) data to be reported, (2) subgrade and subbase, (3) granular base course materials, (4) embankment materials, (5) frost susceptibility, and (6) subbase thicknesses

coated material as determined by petrographic examination, or other suitable granular materials. Granular aggregates from natural or slag sources shall comply with Tables 1 and 2 O.P.S.S. 1010 as amended by Supplemental Specifications for Sewers. 3. Recovered Bituminous Pavement for Blending With Granular for Granular subgrade. Use removed or excavated materials in the Work when the material conforms to the specifications; if not, then recycle or dispose of the material according to 105.16 and 105.19. 204.02 Materials. Furnish suitable material conforming to 203.02.R, 203.03, and 703.16, except use soils in the top 12 inches (300 mm) of the subgrade that have The lime-treated subgrade shall not be mixed when it is raining, or when the subgrade material is frozen. The lime-treated subgrade shall not be mixed or compacted if the temperature of the lime or soil is below 35 °F. 307.05 Preparation of Subgrade. Prior to beginning any lime treatment, the subgrade shall be constructed an Lime Stabilized Subgrade is used to modify the subgrade to bridge soft areas. See Figure 204.H Subgrade Treatment Chart and the other pertinent sections. Use average N values as low as 10, average U of 1.0 tons/ ft 2 and to remove ruts < 6 inches (150mm). A brief outline of the specification requirements follows: Materials (206.02 SUBGRADE PREPARATION 02610-2 SPECIFICATIONS - MAY 1996 REVISED MARCH 2001 02610.02 MATERIALS A. Material Furnished by the County The County will not furnish any materials for subgrade preparation except as is available on the site within the limits designated on the Plans by sections, gradelines, and/or contour lines. B. Contractor's Option

Civil enginee Technical Specification, MRTS04 General Earthworks Transport and Main Roads Specifications, November 2018 1 . 1 Introduction . 1.1 General . This Technical Specification applies to the construction of earthworks in roadworks and bridgeworks AND MATERIAL SPECIFICATIONS ONLINE VERSION January 1ST, 2021 An Equal Opportunity Employer NOTICE: The page layout of this online document WILL NOT MATCH that of the official printed specification book due to page size and formatting differences Any soft areas in embankment, be removed and replaced by app.material, compaction Tests On Borrow Materials Of Embankment/subgrade Test Desirable Frequency / 3000 cum Gradation/ Sand Content 2 Tests Plasticity Index 2 Tests Modified Proctor Test 2 Tests CBR on a set of 3 One Test Specimens Deleterious Constituents As Required Natural Moisture.

During subgrade preparation, adequate drainage is required to be provided at all times to prevent water from standing on the subgrade. The final goal is to have a subgrade that meets the cross section and finish grade requirements as well as satisfying the density and proof rolling Specification prior to placing the initial subbase material The binding characteristics of these materials generally increase subgrade load-bearing capacity. Typically, lime is used with highly plastic soils (plasticity index greater than 10), cement is used with less plastic soils (plasticity index less than 10) and emulsified asphalt can be used with sandy soils STANDARD SPECIFICATION LIME-STABILIZED SUBGRADE 02336-1 02-01-08 Section 02336 . LIME-STABILIZED SUBGRADE . PART 1 G E N E R A L . 1.01 SECTION INCLUDES . A. Foundation course of lime-stabilized sub grade material. 1. Application of lime slurry to sub grade. 2. Mixing, compaction, and curing of lime slurry, water, and sub grade into a.

In order to achieve specified properties, subgrade, select fill, and base materials frequently require chemical treatment with additives such as lime, cement, fly ash, and asphalt. Each of these materials must be properly designed to determine the most appropriate additive and concentration to achieve the desired improvement Section 307 of the Standard Specifications is hereby modified for this project to add the following: DESCRIPTION. 307.01 . This work consists of treating the earth subgrade by combining Portland cement and water with a mixture of imported subgrade soil to the specified depth and compaction requirements as shown on the plans. MATERIALS

Granular Sub Base. Granular Sub-base (GSB) consists of laying and compacting well graded material on prepared sub-grade in accordance with the specifications.: GSB layer is intermediate layer in between Sub-grade and Wet mix macadam. GSB layer is laid in roads and higway works due to its properties This Specification shall be read in conjunction with MRS01 Introduction to Specifications, MRS50 Specific Quality System Requirements Excavation of non-rippable material in Subgrade treatments, rate additional to rate for Standard Work Items 32322, 32326, 32330, 32334, 32338 and 32342 (Provisional Quantity) m³ Specification 2301.03, B The subgrade or subbase should be periodically checked throughout the paving day to ensure that the material is uniformly moist. Moisture should be added as needed to keep the material in a uniformly moist condition. As the subgrade or subbase material dries out, moisture will b Material selection and product specification. Steel material is supplied in two product forms - 'flat products' (steel plate and strip) and 'long products' (rolled sections, either open beams, angles, etc or hollow sections). For structural use in bridges these products are inevitably cut (to size and shape) and welded, one component. The following materials are suitable for use as pavement subbase: A. Select granular material (Specification 3149.2B.2): This is the most commonly specified material. B. Select granular material (super sand) (Specification 3149.2B.3): This is select granular material wit

Subgrades and Subbases for Slabs Concrete Construction

Pre-design and construction geotechnical assessment of subgrade and sub-base materials was carried out for optimal performance and pavement sustainability. Method involved boring of 59holes and trial pits, sampling and geotechnical testing. Soi The subgrade material shall be compacted in accordance with the requirements detailed in Main Roads Standard Specification MRTS 04 General Earthworks, with the testing frequency and requirements are detailed herein: 2. The subgrade material shall be compacted to provide a relative compaction determined by AS1289 for Standard Specifications (16) or Test Procedures (17), as applicable. 2.0 The Subgrade Stability Problem Subgrade stability is defined as the strength and deformation (rutting) properties of the finished subgrade soils that impact pavement construction activities. To be stable, the finished subgrade at the time of placing pavement layers must When the subgrade material is not adequate to support the necessary loads, then additional work should be done to make the material suitable for the construction. Normally, subgrade material is improved by installing geotextiles. They are used to prevent mixing of soft or inadequate soil that might affect the structural capacity of the subgrade

Engineering Instructio

  1. (2) Before placing material, identify areas of yielding subgrade and perform corrective work as specified in 205.3.13. 301.3.3 Stockpiling (1) If continuous compliance with material specifications is questionable, the engineer may require the contractor to supply material from a stockpile of previously tested material
  2. 708 Joint Materials 709 Metals 710 Wood Materials 711 Paints, Coatings, Oils, and Inks 712 Guardrail and Fence 713 Metal Pipe 714 Concrete, Clay, Fiber and Plastic Pipe 715 Miscellaneous Materials 716 Embankment and Subgrade Material 717 Compaction Control of Base Course Material 718 Sewer and Waterline Material
  3. Technical Specification, MRTS05 Unbound Pavements Transport and Main Roads Specifications, July 2021 1 . 1 Introduction . This Technical Specification applies to the supply and construction of unbound granular pavements. Material from natural, quarried and recycled sources, or a combination of these, can all be used
  4. Specification 501 Pavements - 04/10110-04 Issued 20/02/2020 Document No: DXX#XXXX Page 9 of 70 Contract No: XXX/XX [Contract Name] 4. The material laid on the Subgrade and below the Basecourse either for the purpose of making up the additional pavement thickness required, t
  5. materials (both aggregates and soils), effect of repeated loading cycles, and the magnitude of these loads. As trackbed design evolves it will be necessary to treat the subgrade as an integral part of the trackbed that operates in harmony with the sub-ballast, ballast, ties, and rail
  6. imum characteristic dry density ratio of 100% of Standard Compaction depressions excavated below the base of the subgrade zone in ordinary excavation shall be reinstated with subgrade material complying with the requirements of.


A material called DuPont Clay sourced from Woodstown, New Jersey was used for medium strength subgrade with the target CBR of 8. For the high strength subgrade, the locally available sand was used with a target CBR of 20. The specification for pavement and subgrade construction was modeled after the FAA specification contained in Advisory. NOTE: The 2015 Standard Specifications can be ordered by using the Standard Specifications and Construction Manual Order Form. If you have any questions or comments, please contact: Construction: Lee Ann Legge. Bureau of Construction & Materials, 7th Floor. 700 SW Harrison St. Topeka, KS 66603-3754 That fraction of the material passing the No. 40 (425 um) sieve shall have a plasticity index not to exceed 8 when tested in accordance with ASTM D 4318. 2202.3 Placement: A. Subgrade: Prior to placement of base course material the previously prepared subgrade surface shall be cleared of all foreign substances and restored in shape

Subgrade - Pavement Interactiv

If subgrade is replaced, grade depressions in the native material to drain to the subsoil drainage system or connect by mitre drains. In rock subgrades, drain depressions with subgrade drains at least 150 mm wide, backfilled with coarse filter, and connected to the subsoil drainage system Consult the Region Materials Engineer for guidance on use of this specification. It should be considered still in development and long-term field performance is currently being monitored. Use the Project Special Provision. to reclaim existing HBP in place and utilize the material as base or sub-base in the finished pavement template 1. Materials for earthworks construction shall be managed under the sustainability hierarchy of REDUCE, REUSE and RECYCLE. 2. Unless defined otherwise, the materials described in this specification shall be sourced from pits or quarries of natural materials, and shall be blended, crushed or processed as applicable to produce a homogenous material This specification covers the quality management of compacted materials using modulus for the construction of embankments and pavement foundation layers including subgrade, subbase , and base. 2. REFERENCED DOCUMENTS . AASHTO Standards: • M 57 Materials for Embankments and Subgrades (C) Compaction of Subgrade Compact all material to a depth of 200 mm below the finished surface of the subgrade to a density equal to at least 100% of that obtained by compacting a sample of the material in accordance with AASHTO T99 as modified by the Department. Copies of these modified testing procedures are available upo

Prepare the subgrade so that it is firm and able to support without displacement the construction equipment and the compaction operations hereinafter specified. Soft or yielding subgrade shall be corrected and made stable before construction proceeds. Moisten the subgrade as needed before spreading the base material materials are compacted to the specified depth and density. 2201.4 Construction A. General: The subgrade surface shall be brought to the specified lines, grades and cross-section by adding or removing material and compacting to the specified density. Tolerance allowed on all lines, grades and cross-sections shall be no more than 1/4 inch embankment specifications 2105, 2111, and 2123. Emphasis is placed on constructing embankments using established procedures that consider soil type (natural soils if possible), project conditions, and structural design and specifications. Enhancement is the improvement of existing embankment materials by the following methods: 1

Typical Road Structure Cross Section - Sub Grade, Base

Subgrade Soils In California Authors: D. Jones, A. Rahim, S. Saadeh, and J.T. Harvey standard, specification, or regulation. strength testing of cement stabilized materials is acknowledged. PROJECT OBJECTIVES The objective of this project (PPRC Contract SPE 3.14) is to prepare a guideline document on pavement. • Prepare subgrade as required by the plans. • Construct subgrade elevation within the tolerance presented in ACI 117. • If not specified on the plans or related specification compact subgrade to a minimum of 95% of the maximum dry density as determined by ASTM D698 and within ±2% of the optimum moisture conten 1.5 Material Suitability Tests for Subgrade Improvement Layer, Sub-base, Road base and Capping Layer Before a section of road works is commenced and during the construction period, tests shall be carried out to confirm the suitability of materials and to determine the degree of compaction in the sub grade and the layers of the pavement New Specifications: • Section 326: Placement and Construction of Polymer Modified Asphalt Concrete • Section 719: Polymer Modified Asphalt Concrete Specifications rewritten, or with major updates: • Section 106: Control of Materials • Section 309: Lime Stabilization or Modification of Subgrade

SECTION 160 - fdotewp1

Section 5: Pavement Naperville Standard Specifications 500-5 REV 08/01/18 502 MATERIALS 502.1 SUBGRADE All subgrade material shall have a minimum Illinois Bearing Ratio (IBR) of 3.0 as measured by a dynamic cone penetrometer. Subgrade material having an IBR of less than 3.0 shall be modifie Effective with the November 2020 Letting 2021 Standard Specifications 205 Roadway and Drainage Excavation 205.1 Description (1) This section describes excavating and disposing of material taken from within the right-of-way for project construction RE: DGA as SubGrade Material. SirAl (Geotechnical) 17 Sep 04 10:09. A well graded gravel base product is structurally superior to a sand base of equal thickness without question. Whether a switch from 3 of sand to 3 of crush gravel (if that is what is proposed) can justify a 1 reduction in the thickness of your concrete slab thickness.

Chapter 4: Construction Details, Section 4-25 Aggregate

  1. The work to be done under this section of the Specifications and the accompanying plans consists of all labor, material, accessories, and equipment necessary to perform excavations, fills, embankments, subgrade preparation, topsoiling, and such other work and incidentals as may be necessary to properly complete the work
  2. 3. Subgrade should be inspected by the liner installer prior to placement of the liner. Upon completion of the workmanship and/or materials which are believed to not be in compliance with the project plans and specifications, or if subgrade is found to be adequate, issue a certification to that effect to the contractor. Th
  3. The simplest form of sub-grade formation is a 'site-strip'. This process involves the removal of all surface vegetation along with the root zone, approximately 50mm in depth, and any topsoil. It is bad practice to construct a pavement over surface vegetation or topsoil; as organic material, it will decompose, which could lead to the formation.
  4. Specification: Section 17 - In-situ Stabilisation of Subgrade Frankston City Council (Last Updated 24/08/00) Page 1 of 11 SECTION 17 - IN-SITU STABILISATION OF SUBGRADE 17.1 DESCRIPTION This section covers the requirements for in situ stabilisation of the subgrade by addition of cement, blende
  5. Specifications for Embankment and Subgrade Compaction. Six approaches were developed for specifying embankment and subgrade compaction and/or verifying compaction quality on Virginia Department of Transportation (VDOT) construction projects. These approaches, along with VDOT's current practices, were qualitatively evaluated for applicability.
  6. 4.5 Alternative materials for Category A material as sub-base 14 4.5.1 Less Stiff Materials 14 4.5.2 More stiff materials 14 4.6 Alternative Materials for capping layer and sub-base 15 4.6.1 Recycled aggregates and secondary materials 15 4.6.2 Categories of Alternative Granular Materials 1
  7. Often poor subgrade soils do not possess the strength to support road construction activities and the subsequent intended traffic loads. Nilex's subgrade separation and stabilization geosynthetic materials maximize load distribution and increase the effective bearing capacity of the subgrade to help provide a stable foundation layer from which a permanent or temporary road/working platform.
Triax and Biaxial Geogrids - Road Fabrics Inc

Subgrade Material for Paver Installation. With the many types and styles of pavers available today, it's easy to incorporate them in a variety of hardscapes around your home. No paver. The measured density of the subgrade material for a residential application should be 90% to 95% of the Standard Proctor Density. This density can be achieved using a combination of three to four passes with a vibratory plate compactor or rammer, in addition to good moisture content in the subbase obvious deflecting subgrade, subgrade material color changes, unusual adjoining vegetation or other observable conditions which could affect pavement performance. 3. Borings are to be a minimum of 4 feet in depth below design subgrade, with every fourth (minimum of one) boring 9 feet in depth below rough roadway subgrade elevation. 4

PavementTech on Twitter: &quot;Inverted Pavements

NRCS, WI SPECIFICATION - Page 1 of 12 Month Year Construction Specification 202 Polyrthylene Geomembrane Lining and the thickness or weight of the material. SUBGRADE PREPARATION The area to be lined shall be drained and allowed to dry until the surface is firm. The surface must suppor Subgrade materials are typically characterized by their resistance to deformation under load, which can be either a measure of their strength (the stress needed to break or rupture a material) or. Subgrade. The subgrade is the in situ material upon which the pavement structure is placed. Although there is a tendency to look at pavement performance in terms of pavement structure and mix design alone, the subgrade can often be the overriding factor in pavement performance. Figure 1: Subgrade Preparation on SR 528 The KDOT reserves the right to run any test at any time to determine specification compliance. When test results on aggregates or mineral filler supplements indicate non-compliance with specifications, the Engineer may cause those materials to be rejected and removed from the work site at the expense of the Contractor. c. Certification of.

Subgrade preparation includes excavation, earthfill, installation of bedding or filter material, and geotextile instal-lation. Prepare the subgrade in accordance with ASTM D6884, Standard Practice for Installation of Articulating Concrete Block (ACB) Revetment Systems. Compact the subgrade to the density specified on the drawings or in section 7 of this specification to secure a completed subgrade containing a uniform lime mixture, free from loose or segregated areas, of uniform density and moisture content, well bound for its subgrade material accurately to the secondary grade and pulverize the material at the same time, he will not be required to expose the. were unsuitable to use as a subgrade material for pavement construction based on [10] manual specification; thus, for the unsuitable subgrade soils, stabilize by mechanical method of stabilization by A-3 soil, with different percentages ratio (10% , 15% and 20% of locally available selected material that is A3 soil) by weight, were used to. The subgrade is extremely essential, as it is the foundation of the pavement. It should be free of topsoil and vegetation. It must be well compacted and free of soft spots. A subgrade that is not properly installed or compacted will compromise the pavement's structure in the future. The first step of any preparation is an extensive evaluation. This specification shall apply to the in-situ stabilisation of subgrade layers comprising either natural in situ soils, imported fill materials or a combination of both using cement, lime or a combination of these. The subgrade layer(s) shall be constructed in accordance with the levels, grades and cross

PPT - Bases, Subbases, & Low Cost Surfaces PowerPoint

Methodology for Subgrade Construction - Highway Guid

11 Soil exploration and sampling should be performed as described in the preceding sections. The soil can be classified as either a subgrade category or base category material on the basis of AASHTO M145. A key decision factor in selecting the appropriate subgrade additive is the concentration of water soluble sulfates in the soil the soil type of the subgrade, could esult in variations of the moduli. In optimumr conditions, the subgrade would be compacted to 99% of dry unit weight and at optimum moisture content. During seasonal changes, storm and groundwater may infiltrate the subgrade, changing the moisture content and, therefore, changing the resilient modulus Lime Stabilized Subgrade materials, equipment, and construction methods shall comply with most current COA specifications, except moisture content will be determined by test method Tex-103-E . I

where subgrade material is pushed above the elevation of the rail and ties. Under those conditions, ballast drainage is impeded, resulting in further softening and degradation of the subgrade to a point where large, saturated pockets of ballast are trapped in the subgrade. Frost heave and further degradation commonly follow, leading eventually t Departmental Material Specifications (DMS). Reference specifications for various materials published by the TxDOT Construction Division. 25. Direct Traffic Culvert. Concrete box culvert whose top slab is used as the final riding surface or is to have an overlay or other riding surface treatment. 26. Engineer v Disclaimers Author's Disclaimer: The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official view or policies of the Federal Highway Administration or th

Subgrade Preparation - Layfiel

Originally California bearing ratio test was developed in 1929 by California division of highway for evaluating the stability of soil sub-grade and other flexible Highway Materials which was later modified by the U.S. Corps of Engineers. The abbreviation of the California bearing ratio is (C.B.R.) A. Subgrade: The uppermost surface of an excavation, including excavation for trenches, or the top surface of a fill or backfill immediately below base course, pavement, or topsoil materials. B. Backfill: Soil material or controlled low -strength material used to fill an excavation The subgrade may contain a layer of selected subgrade material in the Selected Material Zone (SMZ) and other layer(s) on top of the natural subgrade. See . Figure 2. Figure 1: Typical layers of flexible and rigid pavements . Figure 2: Typical layers of a road embankment according to specification IC-QA-R44 . UZF other than SMZ UZF other than SM Provides individual specifications from AC 150/5370-10, Standards for Specifying Construction of Airports, including construction standards for general provisions, earthwork, flexible base courses, rigid base courses, flexible surface courses, rigid pavement, fencing, drainage, turfing, lighting installation, pavement rejuvenatio materials in accordance with these specifications. The Developer has the option of treating subgrade materials with hydrated lime, quicklime and Portland cement or combinations thereof when determined to be necessary through laboratory analysis of subgrade materials. Stone per LADOTD Subsection 1003.01 and 1003.03(b) may b

Pavement Manual: Treated Subgrade and Base Course

  1. In case of extremely poor subgrade, it may be necessary to remove the upper portion of the subgrade and replace it with a select material. When finished, the graded subgrade should not deviate from the required grade and cross section by more than one-half inch (1/2) in ten feet (10′)
  2. A. The geomembrane shall consist of new, virgin materials and be manufactured specifically for this work and will have satisfactorily demonstrated by prior testing to be suitable and durable for such purposes. The geomembrane shall be manufactured and fabricated by a member of the PGI and to the PGI 1104 specifications. 3.01 Subgrade Preparation A
  3. ation of the California Bearing Ratio (CBR) of pavement subgrade, subbase, and base course materials from laboratory compacted specimens. The test method is primarily intended for, but not limited to, evaluating the strength of materials having maximum particle size less than 3 / 4 in. (19 mm)
  4. MATERIAL SPECIFICATION FOR AGGREGATES - BASE, SUBBASE, SELECT SUBGRADE, AND BACKFILL MATERIAL . OPSS 1010.04.01 The first paragraph is superseded by the following . OPSS 1010.04.01 Submission of Test Data . The Contractor shall have test results available for the aggregates to be used in th
  5. g and curing of such materials. 3. This Specification provides the requirements for stabilisation of the types of pavement courses and subgrade zones or layers as shown in Table 241.1
Road Construction Method Statement6 BASIC STEPS COMPRISING WBM ROAD CONSTRUCTION PROCEDUREHeavy Steel High Quality Cbr Mould Annular Surcharge

TxDOT Specification

  1. When all the various sub-routines have been coded the program is ready for testing. Just how movies and television shows are inspired by popular novels and comics, K-dramas are no different
  2. Classification of Highway Subgrade Material
  3. Item 204 Subgrade Compaction and Proof Rolling / Test Rollin
  4. Division 300 Bases Section 304 Aggregate Base Course
  5. 206 Lime Stabilized Subgrad
Chapter 2