road base and subbase material requirement

  • CHAPTER 3: SUBGRADE, SUBBASES, and BASES

    301-2 material . 301-3 construction requirements . 301-3.01 preparation of roadbed . 301-3.02 application of lime . 301-3.03 mixing . 301-3.04 compaction and finishing . 301-3.06 safety program . 302 cement treated subgrade . 302-3 construction requirements . 302-3.03 mixing . 303 aggregate subbase and aggregate base . 303-2 materials . 303-3 ...

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  • Fill/Backfill Compaction Requirements for Sub Base, Base ...

    Jul 04, 2021 · The compaction requirement for base coarse (Road) shall not be less than 100% of the maximum laboratory dry density as determined by ASTM D1557 or AASHTO T180. The compaction requirement for subbase (Road) shall not be less than 95% of the maximum laboratory dry density as determined by ASTM D1557 or AASHTO T180.

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  • Bases and Subbases for Concrete Pavement

    Bases and Subbases for Concrete Pavements • Los Angeles (L.A.) abrasion resistance (AASHTO T 96) of 50 percent or less. • Permeability of approximately 150 ft/day and not exceeding 350 ft/day. Limiting the amount of fines is the most important criterion for preventing pumping, base erosion, and frost action.

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  • Typical Road Structure Cross Section - Sub Grade, Base ...

    Mar 23, 2017 · It acts as a separating layer b/w subgrade and road base. By this it prevent the two layers from mixing up. b. 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.

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  • 22 Spec - 301 Base, Subbase, and Subgrade Aggregate

    301 Base, Subbase, and Subgrade Aggregate 301.1 Description (1) This section describes requirements common to sections 305 through 313 and 350. Exceptions and additional requirements are specified in those sections. 301.2 Materials 301.2.1 General (1) Provide coarse aggregates from a department-approved source as specified under 106.3.4.2.

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  • What is the difference between a road base and a subbase ...

    A road base is defined as a layer or layers of bound material intended to give structural integrity to a pavement. The base consists of well-graded material, usually crushed stone. Sub-base consists of a lower quality material, sometimes crusher-run product, or the finer fraction of crushed stone production.

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  • (PDF) CONSTRUCTION OF SUBGRADE, SUBBASE AND BASE

    CONSTRUCTION OF SUBGRADE, SUBBASE AND BASE LAYERS Dr. Anjaneyappa Department of Civil Engineering RV College of Engineering Bengaluru – 59 Email: [email protected] Pavement Types Flexible pavements Rigid pavements / Cement Concrete (CC) Pavements Semi-rigid pavements Composite pavements Pavement

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  • ENGINEERING REVISION TO STANDARD SPECIFICATION

    667-2.02 Materials Requirements. Provide materials for road gravel surface, base, and subbase courses that consist of Sand and Gravel, approved Blast Furnace Slag or Stone that meet the requirements contained herein. Provide materials well graded from coarse to fine, and free from organic or other deleterious materials.

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  • Road Aggregate 101: Important Stuff

    PennDOT requires gravel used for road construction to be durable with a minimum of 85% crushed particles and at least two faces resulting from fracture. Stone - a piece of rock quarried and worked into a specific size and shape for a particular purpose. PennDOT requires that stone be durable and free from slate texture or cleavage planes.

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  • SECTION 300 – AGGREGATE PAVEMENT AND BASES SECTION

    SECTION 302 – SUBBASE 302.01 Description This work shall consist of a foundation course of selected materials, placed and compacted on a prepared subgrade in accordance with 105.03. Subbase for PCCP shall consist of 3 in. of coarse aggregate No. 8 as the aggregate drainage layer placed over a 6 in. coarse aggregate No. 53 as the separation layer.

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  • ENGINEERING REVISION TO STANDARD SPECIFICATION

    667-2.02 Materials Requirements. Provide materials for road gravel surface, base, and subbase courses that consist of Sand and Gravel, approved Blast Furnace Slag or Stone that meet the requirements contained herein. Provide materials well graded from coarse to fine, and free from organic or other deleterious materials.

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  • Standard Subgrade and Base Construction

    This item establishes the requirements for hydrated lime and commercial lime slurry of the type and grade considered suitable for use in the treatment of natural or processed materials or mixtures for stabilization of subgrade, subbase and base construction. This specification is applicable for projects or work involving either inch-pound or SI

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  • “SECTION 304 - SUBBASE COURSE

    compact the material in accordance with the requirements of §203-3.12 , Compaction. Density tests are not required for the acceptance of these courses. When a subbase course has been placed, but subsequent paving operations have been delayed so that the subbase has been disturbed by frost action, recompact the subbase where directed by the ...

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  • Concrete Pavement Bases and Sub-Bases | Specify Concrete

    Mar 12, 2019 · A sub-base beneath the pavement is not an inherent requirement, but ever since the first cement pavement was placed in America in 1891, the industry as a whole has shifted towards utilizing cement base and sub-bases. An adequately prepared sub-base and base are a prerequisite in order to achieve uniformity across the pavement structure.

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  • Granular Sub Base Construction And Quality Control ...

    Granular Sub Base is a layer in road foundation just above the compacted sub-grade layer. GSB or granular sub-base prevents capillary water from rising; its particle size is so designed that the capillary action stops and cant go beyond GSB layer. Secondly, it works like a drainage layer where water can pass without damaging other road layers.

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  • 1141 Flexible pavement base and subbase 20.0 MARKUP

    undesirable material to Base/Subbase material properties and test methods tables. - Test results from a NATA accredited laboratory. Alternative unbound base and subbase materials: If proposed, submit details of the following: - Test results from a NATA accredited laboratory. - Evidence of conformance to the Shear strength table. Records

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  • Granular Sub-base (GSB)-Specification and construction ...

    Aug 18, 2020 · 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 .

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  • SECTION 300 – AGGREGATE PAVEMENT AND BASES SECTION

    SECTION 302 – SUBBASE 302.01 Description This work shall consist of a foundation course of selected materials, placed and compacted on a prepared subgrade in accordance with 105.03. Subbase for PCCP shall consist of 3 in. of coarse aggregate No. 8 as the aggregate drainage layer placed over a 6 in. coarse aggregate No. 53 as the separation layer.

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  • Materials - QA specifications - Specifications - Technical ...

    May 03, 2021 · 3051 - Granular Base and Subbase Materials for Surfaced Road Pavements. 3051 - Granular Base and Subbase Materials for Surfaced Road Pavements download pdf

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  • 32 11 23 - Aggregate Base Course

    A. Aggregate for the two classes of aggregate bases at the time the base material is deposited on the prepared sub grade or sub base shall conform with ASTM D1241 and the following requirements: 1. Class 1 Aggregate Base: a. Class 1 aggregate base shall consist of crushed stone or gravel, free from vegetable matter and other deleterious substances.

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  • Bill Text - AB-1035 Transportation: Road Maintenance and ...

    Feb 18, 2021 · The standard specifications shall allow recycled materials at or above the level allowed in the department’s standard specifications for recycled base and subbase materials set forth in Sections 25-1.02 and 26-1.02, reclaimed asphalt pavement and other materials in asphalt set forth in Section 39-2.02B, reclaimed aggregate, fly ash, returned ...

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  • SECTION 160 - fdotewp1.dot.state.fl.us

    1604.1 Commercial and Local Materials: Meet the requirements of Section 914 for the particular type of stabilizing material to be used. 1604.2 Use of Materials from Existing Base: When the use of materials from an existing base is required as all, or a portion, of the stabilizing additives, the Engineer will direct the location, placement, and ...

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  • ANALYSIS OF USING RECLAIMED ASPHALT PAVEMENT (RAP)

    Oct 19, 2006 · the field(12). Base and subbase materials were sampled from three regions in that state and evaluated under the following performance tests: permeability (falling and constant head conditions), triaxial shear strength, cyclic triaxial loading, California Bearing Ratio (CBR) and resilient modulus.

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  • Application Description - Granular Base - User Guidelines ...

    Mar 08, 2016 · Granular subbase is also dense graded, but tends to be somewhat more coarse than granular base. The requirement for crushed content for granular subbase is not required by many agencies, although provision of 100 percent crushed aggregates for base and subbase use is increasing in premium pavement structures to promote rutting resistance.

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  • SUB-BASE AND ROAD-BASE - Method Statement HQ

    2.2 Placing of Upper Subbase 2.3 Placing of Road Base and Wet Mix Macadam 2.1 Placing of Subbase 2.1.1 Prior to placing any Lower Subbase material, the underlaying subgrade shall be shaped and compacted in accordance to the specifications. 2.1.2 The material shall be placed over the full width of the formation to

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  • Method Statement for Placement of Sub Base and Road Base ...

    Sep 17, 2018 · In the course of the road construction, the level shall be checked using control/dipping pegs, set out at regular interval along both sides of the pavement. Step 2: Placement of Upper Sub base. Prior to placing any upper sub base material, the underlaying subgrade or subbase shall be shaped and compacted in accordance to the specifications.

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  • Subgrades & Subbases for Concrete Slabs - Concrete Network

    Jul 31, 2018 · The entire subbase and base system should be at least 4 inches thick—thicker if the engineer feels it is needed for proper support. The base course material, according to ACI 302, "Concrete Floor and Slab Construction," should be "compactible, easy to trim, granular fill that will remain stable and support construction traffic."

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  • Sub-bases | Pavingexpert

    The sub-base layer is often the main load-bearing layer of a pavement. It is designed to evenly spread the load of the paving, and any traffic thereon, to the sub-grade below. A well-constructed sub-base will aid drainage and prevent settlement and channelisation - the phenomenon common on cheap installations of block paving, where two 'ruts' develop in the paving.

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  • R40 P avement Base and Subbase Dat e: July 2014 Editi on 1 ...

    The material and construction standards for the five material categories (Base Class A and B, Subbase 1 and 2 and Unsealed Road and Unsealed Shoulders Wearing Surface) are included in the Appendices.

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  • Section 00641 - Aggregate Subbase, Base, and Shoulders

    00641.42 Placing Aggregate Base or Subbase on Geotextile - When subgrade or drainage geotextile is required between the subgrade and base, place the first lift of material directly on the fabric, without road mixing. 00641.43 Thickness and Number of Layers:

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  • Chapter Three - Granular Base and Subbase Construction ...

    However, the survey of state and Canadian provincial transportation agencies conducted under the scope of this synthesis study indicated that only 37% of the responding agencies (17 of 46) currently have specific guidelines regarding the transportation and storage (stock- piling) of aggregate materials for base and subbase construc- tion.

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  • Table 3602/1 CRUSHED STONE BASE AND SUBBASE:

    Table 3602/1 CRUSHED STONE BASE AND SUBBASE: MATERIAL REQUIREMENTS Material TYPE OF MATERIAL Characteristic G1 G2 G3 Parent Sound rock from an approved Sound rock, boulders Sound rock, boulders or Material quarry, or clean, sound mine or coarse gravel coarse gravel rock from mine dumps, or clean sound boulders

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  • Materials Used for the Construction of Roads: Methods ...

    Binder materials such as bitumen and cement mixed with appropriate types and proportions of aggregates are used for the construction of superior types of roads that are characterised by their durability and load-carrying capacity. Thus, base courses, sub-base courses and even the surface or wearing courses require the use of these materials.

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  • SECTION 160 STABILIZING 160-2 Stabilized Subgrade.

    160-4.1 Commercial and Local Materials: Meet the requirements of Section 914 for the particular type of stabilizing material to be used. 160-4.2 Use of Materials from Existing Base: When the use of materials from an existing base is required as all, or a portion, of the stabilizing additives, the Engineer will direct the location,

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  • Introduction to roadbase products and testing

    Sub-base material layers tend to be placed deeper within a pavement where loading is less, and as such the quality of the materials within sub-bases may not need to be premium. Significant fines and plasticity (plastic fines) may also be incorporated to assist in the binding nature of the sub-base material required during placement.

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  • Granular sub base : Its function , requirements , its ...

    Apr 09, 2020 · The material used in sub-grade is Natural sand, moorum, Gravel, crushed stone, crushed slag. Use of materials like brick material, kankar and crushed concrete shall be permitted in the lower sub Base. Natural sand can not fulfill the grading requirement of granular sub Base hence natural sand can be used with a combination of other material.

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  • Effect of Fine Percentage on the Properties of Sub-base ...

    Finding sub-base material as per required specifications is a major issue in many parts of Sri Lanka. Therefore, in some cases, crushed stone is used as an alternative to sub-base material.

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  • DIVISION II MATERIALS

    Plasticity: Subbase and aggregate base materials shall be either non-plastic (PI=0) or shall conform to the requirements of Table II-11 of the Specifications when tested in accordance with VTM-7. If the material is classified as non-plastic (PI=0), in accordance with VTM-7, the Liquid Limit requirement will be waived.

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