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    16 - Roadbase - Pavement Works

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    asr.engineering2023
    This document provides a method statement for constructing a flexible pavement roadbase layer. It outlines responsibilities, materials, equipment, and the construction process. The process involves leveling and compacting the subbase, delivering and spreading crushed aggregate roadbase material, compacting it to 95% maximum dry density using a vibratory roller, and conducting quality checks such as density measurements. The method statement is intended to clearly define the process to ensure the roadbase is constructed according to specifications.

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    16 - Roadbase - Pavement Works

    Uploaded by

    asr.engineering2023
    6 views4 pages
    This document provides a method statement for constructing a flexible pavement roadbase layer. It outlines responsibilities, materials, equipment, and the construction process. The process involves leveling and compacting the subbase, delivering and spreading crushed aggregate roadbase material, compacting it to 95% maximum dry density using a vibratory roller, and conducting quality checks such as density measurements. The method statement is intended to clearly define the process to ensure the roadbase is constructed according to specifications.

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    This document provides a method statement for constructing a flexible pavement roadbase layer. It outlines responsibilities, materials, equipment, and the construction process. The process involves leveling and compacting the subbase, delivering and spreading crushed aggregate roadbase material, compacting it to 95% maximum dry density using a vibratory roller, and conducting quality checks such as density measurements. The method statement is intended to clearly define the process to ensure the roadbase is constructed according to specifications.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    6 views4 pages

    16 - Roadbase - Pavement Works

    Uploaded by

    asr.engineering2023
    This document provides a method statement for constructing a flexible pavement roadbase layer. It outlines responsibilities, materials, equipment, and the construction process. The process involves leveling and compacting the subbase, delivering and spreading crushed aggregate roadbase material, compacting it to 95% maximum dry density using a vibratory roller, and conducting quality checks such as density measurements. The method statement is intended to clearly define the process to ensure the roadbase is constructed according to specifications.

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    © All Rights Reserved
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    of 4

    S_04 ECET-02

    ROADBASE – PAVEMENT WORKS

    1.0 PURPOSE

    This purpose is to define and establish the method statement to be used for
    construction of flexible pavement such as roadbase layer.

    2.0 SCOPE

    To provide clear instruction for construction, of flexible pavement.

    2.1 The work shall be performed in accordance with the horizontal alignments,
    surface levels.
    2.2 The longitudinal regularity of the surfaces shall be carried out as shown on
    drawing and specification.

    3.0 REFERENCES

    BS 1377 Test 15B (Sand Replacement Method);


    Test 13 (Maximum Dry Density).
    Test 16 5.1/1975(California Bearing Rations).
    Standard Drawing & JKR Spec.

    4.0 DEFINITION

    -Nil-

    5.0 RESPONSIBILITIES

    5.1 Project Manager.

     Ensure that method statement comply with client requirement.


     Submit method statement to client/SO for approval;

    5.2 Deputy Project Manager / Section or Site Engineer

     Monitor implementation of this method statement and ensure quality of


    works comply with the specified requirements;
     Co-ordinate with laboratory testing/consultant if required;

    5.3 Machine Operators.

     Carry out crushed aggregate compaction using the motor grader / vibratory
    roller;
     Follow site engineer/ supervisor instruction;

    Version 1.B 01-April-02 Page 1 of 4


    S_04 ECET-02
    ROADBASE – PAVEMENT WORKS

    6.0 MATERIALS

    6.1 Approved roadbase materials shall be delivered to site by tipper trucks.


    6.2 Maximum particle size shall be not exceeded the size shown on JKR Spec.
    6.3 Material shall conform with specification :
    a) Crushed Aggregate –CBR shall not be less than 80% (CBR > 80%).

    7.0 EQUIPMENT’S

    7.1 Motor Grader;


    7.2 Water Tanker;
    7.3 Tipper Trucks;
    7.4 Vibrating Compactor;

    8.0 SAFETY CONDITION

    Refer to Safety Booklet

    9.0 ACTIVITY PROCESS

    9.1 Method of working for subbase preparation.

    9.1.1 Work shall commence on site upon approval and acceptance of the
    subbase.

    9.1.2 The subbase shall be leveled and compacted by using vibratory roller
    after compaction of any specified subbase in pavement area.

    9.1.3 Verification of the subbase compaction shall be carried out using sand
    replacement method or other method deemed suitable by the engineer.

    9.2 Construction Procedure

    9.2.1 Works shall commence on site upon approval and acceptance of the
    subbase layer.

    9.2.2 Approval roadbase material shall be delivered to site by tipper trucks.

    9.2.3 Laying and spreading in full width of the roadbase material shall be out
    using backpushers and motor grader or other approval mechanical.

    Version 1.B 01-April-02 Page 2 of 4


    S_04 ECET-02
    ROADBASE – PAVEMENT WORKS

    9.2.4 Compaction using vibratory roller shall commence when the moisture
    value compaction shall be carried out in a single layer.

    9.2.5 The surface of the crushed aggregate roadbase and grades,by the
    drawing and comply with the tolerance ( +0mm – 20mm ) specified.

    9.2.6 On compaction of laying and compaction joint survey and insitu density
    measurement shall be conducted to check for compliance with the
    specified requirement.

    9.2.7 Compaction requirement


    Method of compaction to achieve not less than 95% of the maximum
    Dry Density as dererminede by BS 1377 Test 13 ( 4.5kg remmer
    method ).

    9.3 Field control

    9.3.1 Compaction trial


    a. Compaction trial shall be out to asses the suitability of the
    compaction plant and to establish the rolling pattern required to
    achieve the specified compaction required.
    b. Compaction shall be carried out using vibratory roller with
    specifications as given below :

    Model : Dynapac CA 25 or equivalent

    Operating weight total : 10,400 kg

    Vibration Frequency : 1700rpm – 28.3 Hz

    Speed : 3 – 5 km/hr

    In order to achieve the specified compacted density,compaction using the


    vibrator roller as specified / equivalent shall commence only when the moisture
    content of the subbase determined in accordance with BS 1377 test 13.

    Version 1.B 01-April-02 Page 3 of 4


    S_04 ECET-02
    ROADBASE – PAVEMENT WORKS

    10.0 QUALITY RECORD

     Request for Inspection ( RFI )


     Laboratory Test Report
     Survey Record
     Quality Verification Checklist (QVC)
     Daily reports

    11.0 MANPOWER

     Site Engineer/Supervisor 01
     Machine Operators 02
     Laborers 02
     Trucks Drivers 04

    Version 1.B 01-April-02 Page 4 of 4

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