base course consist

  • 401. GRANULAR SUB BASE 401. 1. Scope 401.2.1.

    406. WET MIX MACADAM SUB-BASE/BASE 406.1. Scope This work shall consist of laying and compacting clean, crushed, graded aggregate and granular material, premixed with water, to a dense mass on a prepared subgrade/sub-base/base or existing pavement as the case may be in accordance with the requirements of these Specifications.

  • Asphalt Driveway Base Material - Should Base Be Installed ...

    Adding asphalt driveway base material or any other type of structural base to unstable sub-grade can stabilize the soil and in turn lengthen the life expectancy of the asphalt driveway. However, whether base should be installed or should not be is a difficult question to .

  • Subbase (pavement) - Wikipedia

    In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the pavement, but it is necessary for surfaces used by vehicles. Subbase is often the main load-bearing layer of the pavement.Its role is to spread the load evenly over the subgrade.

  • Section 3 Specification 3.6 TABLE OF CONTENTS

    Granular base course shall consist of an intimate mixture of crushed aggregate and water, which is placed in layers upon a prepared surface, compacted and finished, as specified herein. 3.6.1.2 Definitions A "Control Strip" is a lift of granular base course constructed using the equipment and method of

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  • 02204 - Base Course - Juneau

    A. Aggregate base course shall consist of crushed gravel or crushed stone, conforming to the quality requirements of AASHTO M 147. The aggregate shall be free from lumps, balls of clay, or other objectionable matter, and shall be durable and sound. B. Base course material shall conform to one of the following gradations as specified:

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  • SUBBASE AND BASE COURSE

    SUBBASE AND BASE COURSE Pavements ... Any distortion or displacement in the subgrade of a flexible pavement is reflected in the base course and upward into the surface course. These ... For example, a two-layer structure consists of a compacted subgrade and a base course only.

  • Base course - Wikipedia

    The base course or basecourse in pavements is a layer of material in an asphalt roadway, race track, riding arena, or sporting field.It is located under the surface layer consisting of the wearing course and sometimes an extra binder course.. If there is a sub-base course, the base course is constructed directly above this layer.

  • SECTION 304

    SECTION 304 -130- 2006 NHDOT STANDARD SPECIFICATIONS DIVISION 300 -- BASE COURSES SECTION 304 -- AGGREGATE BASE COURSE Description 1.1 This work shall consist of furnishing and placing base courses on a previously prepared subgrade or course .

  • HMA Pavement BASICS

    Base Course: The base course is the bottom layer of a pavement system designed to create a strong foundation for the wearing course. The two most common base courses are 25mm and Bituminous Concrete Base Course (BCBC), with a nominal maximum aggregate size of 25mm (1 inch).

  • SECTION 903-AGGREGATES - University of Memphis

    (c) Coarse aggregate for cement treated permeable base shall be Size No. 57 meeting the quality requirements above. 903.04-Aggregate for Lean Concrete Base. Aggregate for Lean Concrete Base shall consist of crushed limestone, crushed slag, crushed or uncrushed gravel meeting the requirements of Subsection 903.05, for Class B, Grading D.

  • GRANULAR MATERIAL FOR SUB BASE | Road Works

    Jul 18, 2019 · B. Gravel shall consist of hard, durable and sound rock fragments, free from dirt, organic matter, shale and other deleterious substances. C. Granular materials for sub-base shall meet the requirement of class A or B as shown in table 3.1.2, when tested in accordance with AASHTO T-27 after dry mixing and just before spreading and compacting ...

  • Residential Driveway Paving 101 - Carroll Construction ...

    The crushed aggregate base course should consist of one or more layers placed directly on the prepared sub-grade, spread, and compacted to the uniform thickness and density as required on the plans or established in the contract. Absolute minimum crushed aggregate thickness is four inches (4″).

  • SECTION 02621 AGGREGATE BASE AND SUBBASE .

    SECTION 02621 AGGREGATE BASE AND SUBBASE COURSES ... Aggregate base and subbase courses shall include, but not necessarily be limited to, furnishing and placing one or more courses of aggregate, including additives when ... When the base course consists of two or more superimposed courses, the total thickness of the composite base courses shall ...

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  • PART III BASE COURSES -

    301.02.1 Soils for Soil Cement: Soils for soil cement base course shall consist of materials that will stabilize with cement in accordance with DOTD TR 432. Such materials are those soils classified as A-1-a, A-1-b, A-2-4, A-2-6, A-4, and A-6 in accordance with DOTD TR 423. Do not use soil

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  • DIVISION 22. BASE COURSES

    DIVISION 22. BASE COURSES Construct base courses on prepared subgrades or subbases. Base courses consist of construction performed according to the requirements specified for the various types in the following sections. Comply with the lines, grades, thicknesses, and typical cross sections shown in the contract documents.

  • PCC Pavement - Pavement Interactive

    Base course. This is the layer directly below the PCC layer and generally consists of aggregate or stabilized subgrade.. Subbase course. This is the layer (or layers) under the base layer. A subbase is not always needed and therefore may often be omitted.

  • Components Of Road Pavement Structure - Daily Civil

    Components Of Road Pavement Structure: Following are the different components of road structure: 1. Subgrade 2. Sub-base 3. Base course 4. Surface course or wearing course All these components belong to a typical flexible pavement, whereas rigid pavement usually consists of subgrade, subbase and a concrete slab. 1. Subgrade: The finished and compacted surface of [.]

  • Bases and Subbases for Concrete Pavement

    Bases and Subbases for Concrete Pavements . ... The base layer may consist of unbound aggregate, bitumen-, or cement-bound aggregate. The bound ... Base Course Subgrade (existing soil) Subbase Course Figure 5. Illustration. Definitions of base and subbase layers. DESIGN CONSIDERATIONS FOR

  • Recycled Aggregate.gov

    Crushed Aggregate Base (CAB) does NOT include recycled aggregate. CAB may sometimes be specified where recycled base (CMB or PMB) would also meet requirements. Crushed Miscellaneous Base (CMB) allows recycled aggregate. The Greenbook states that CMB "shall consist of broken and crushed AC or PCC and may contain crushed aggregate base or other ...

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  • 32 11 23 Aggregate Base Course - UDFCD

    Preparation of foundation for construction of a subbase, base, or surface course shall consist of the WORK necessary to restore, correct, strengthen, or prepare the foundation to a condition suitable for applying and ... 32 11 23 Aggregate Base Course ...

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  • AGGREGATES FOR BASE COURSES | Road works

    Jul 23, 2019 · A. Aggregates for use in base course construction shall be either crushed stone or crushed gravel. The fine aggregate shall consist of screenings obtained from crushed stone, gravel or sand. Aggregate shall be washed if necessary to remove excessive quantities of clay, silty clay or salts.

  • Flexible Pavement Composition and Structure

    The composition and structure of flexible pavement consists of surface course, binder course, base course, subbase course, frost protection course, subgrade. Flexible pavements contain bitumen or asphalt layer as wearing course and supports loads through bearing. They have low flexural strength ...

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  • Item P-219 Recycled Concrete Aggregate Base Course

    This item consists of a base course composed of recycled concrete aggregate, crushed to meet a particular gradation, constructed on a prepared course in accordance with these specifications and in conformity to the dimensions and typical cross sections shown on the plans.

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  • FM 5-430-00-1 Chptr 5 Subgrades and Base Courses

    The crushed rock used for macadam base courses should consist of clean, angular, durable particles free of clay, organic matter, and other unwanted material or coating.

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  • SPECIFICATION P–208. AGGREGATE BASE COURSE

    P-208 SPECIFICATION P–208. AGGREGATE BASE COURSE DESCRIPTION 208–1.1 This Work consists of a base course composed of hard, durable particles or fragments of crushed coarse aggregate blended with either binder and fine aggregate or filler. Construct it on a prepared underlying course in accordance with these Specifications and in conformance

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  • PART III BASE COURSES -

    301.02.1 Soils for Soil Cement: Soils for soil cement base course shall consist of materials that will stabilize with cement in accordance with DOTD TR 432. Such materials are those soils classified as A-1-a, A-1-b, A-2-4, A-2-6, A-4, and A-6 in accordance with DOTD TR 423. Do not use soil

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  • INDEX FOR SPECIFICATIONS FOR GRANULAR BASE .

    base course thereon. The surface shall be prepared at least one but not more than three kilometres in advance of placing granular base course. Material that is blade mixed and watered shall be compacted in maximum lifts of 150 mm to a minimum of 95% AASHTO Standard Dry Density. No direct payment will be made for providing water for compaction.

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  • DPWH Accredited Contractors Materials Engineer: ITEM 202 ...

    ITEM 202 – CRUSHED AGGREGATE BASE COURSE. 202.1 Description. This item shall consist of furnishing, placing and compacting crushed gravel, crushed stone or crushed rock on a prepared subgrade/subbase in one or more layers in accordance with this Specification and lines, grades, thickness and typical cross-sections shown on the Plans, or as ...

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  • DPWH Accredited Contractors Materials Engineer: ITEM 202 ...

    ITEM 202 – CRUSHED AGGREGATE BASE COURSE. 202.1 Description. This item shall consist of furnishing, placing and compacting crushed gravel, crushed stone or crushed rock on a prepared subgrade/subbase in one or more layers in accordance with this Specification and lines, grades, thickness and typical cross-sections shown on the Plans, or as ...

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  • Reclaimed Asphalt Pavement - Material Description - User ...

    Granular Base Aggregate. To produce a granular base or subbase aggregate, RAP must be crushed, screened, and blended with conventional granular aggregate, or sometimes reclaimed concrete material. Blending granular RAP with suitable materials is necessary to attain the bearing strengths needed for most load-bearing unbound granular applications.

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