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SYABAS’ STANDARD SPECIFICATION FOR PIPE LAYING WOKS

First Edition : May 2007

L–C O N C R E T E W O R K

1.0 CONCRETE

1.1 Scope

This section covers the supply of materials for concrete, design of concrete mixes,

quality control of concrete, mixing, transporting, placing and curing of concrete,

and testing of concrete.

The standard of materials and workmanship shall not be inferior to the

recommendations of the current:

British Standard 8110 : Structural Use of Concrete

British Standard Code of Practice BS 8007 1987: Design of Concrete Structures for Retaining Aqueous liquids.

Appropriate Malaysian Standards approved by the S.O.

Unless otherwise specified, all reinforced concrete for retaining aqueous liquids

shall comply with BS 8007 and shall be of Grade C35A designed to resist Class 2

Sulphate Conditions as defined in BS 5238: Part 1 Table 7.

1.2 Concrete Production at the Site

At the commencement of the Contract the Contractor shall submit for the approval

of the S.O. a method statement detailing with regard to the requirements of this

Specification his proposal for the organization of concreting activities at the site.

The method statement shall include the following items :-

(a) Plant proposed;

(b) Laying of concrete production facility;

(c) Proposed method of organisation of the concrete production facility;

(d) Quality control procedures for concrete and concrete materials;

(e) Method of transport and placing of concrete;

(f) Striking times for formwork and procedure for temporary support of beams

and slabs.

Certificates

1.3 Test

Unless otherwise directed by the S.O., manufacturer's test sheets shall be supplied

with each consignment of cement and admixture certifying compliance with the

relevant standard.

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SYABAS’ STANDARD SPECIFICATION FOR PIPE LAYING WOKS

First Edition : May 2007

The Contractor shall also submit to the S.O. certificates of calibration for the

weighing and dispensing equipment on the concrete batch mixing plant, certified

test results for all tests carried out on aggregate, water, fresh concrete and hardened

concrete, all as specified.

Samples

1.4 Aggregate

Prior to the commencement of the trial mixes of concrete the Contractor shall

submit for approval samples 50 kg in weight of each aggregate which he proposes

to use.

The source of each aggregate shall be clearly marked on the container of each

sample.

Certified test results demonstrating compliance with the relevant quality standard

shall be submitted at the same time. Samples approved by the S.O. shall remain

preserved at site for reference.

1.5 Records of Concreting

An accurate and up to date record showing dates, times, weather and temperature

conditions when various sections of the works are concreted shall be kept by the

Contractor and shall be available for inspection by the S.O. The Contractor shall

also record the results of all tests of concrete and shall identify these results with the

parts of the works of which the samples material is representative.

For each grade of concrete, the Contractor shall submit to the S.O., not later than

twenty-four hours after concreting, a daily return of the number of batches mixed,

the number of batches and total volume of concrete placed, the number of batches

wasted or rejected and the weight of cement used.

The return shall also include specific details of each location in the works where

concrete is placed, together with the grade of concrete, total volume of concrete

placed and the number of batches used for each location.

Mixes

1.6 Concrete

At the commencement of the works the Contractor shall design a mix for each grade

of concrete which will be required for use in the works and shall submit full details

of the mix designs to the S.O. for his approval. Each mix design shall be according

to the requirements of BS 5328.

1.7 Construction Joints and Lifts

The Contractor shall submit to the S.O. for his approval, as soon as is practicable

after the acceptance of his tender and not less than three weeks before the

commencement of concreting, drawings showing his proposals for placing concrete

on which the position of all construction joints and lifts shall be shown. No

concreting shall be started until the S.O. has approved the method of placing, the

positions and form of the construction joints and the lifts. The construction joints

shall be located so as to impair the strength of the structure.

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SYABAS’ STANDARD SPECIFICATION FOR PIPE LAYING WOKS

First Edition : May 2007

Rebates, keys or notches shall be formed and waterstops inserted as the S.O. may

require. The position of construction joints and the size of formwork panels shall be

so coordinated that where possible the line of any construction joint coincides with

the line of a formwork joint and that in any case all construction joint lines and

formwork joint lines appear as a regular and uniform series.

For all exposed horizontal joints and purposely inclined joints, a uniform joint shall

be formed with a batten of approved dimensions to give a straight and neat joint

line.

1.8 Cement

The cement used for any particular mix shall comply with whichever of the

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