DESIGN OF CONCRETE MIX

Infrastructure Program Management (GHD Pty Ltd)Quality Assurance / Quality Control ProceduresForm No. TC - G - 6

DESIGN OF CONCRETE MIX

(Per Bag of Cement)

Subproject Name:__________________________________________________________________

Contractor:_____________________________________Contract No.:_______________

Source of Supply:Lab. Ref. No.:

Stores Entry No.:No. of Samples:

Date of Sample Collected:Tested as per:ACI 211

SNI 03-2834-1983

Date Tested:No. of Sample Tested:

Materials Description:

DATE FROM PRELIMINARY TEST:

FINE AGGREGATESCOARSE AGGREGATES

Laboratory no.:Laboratory no.:

Type:Type:

Fineness modulus:Maximum size, mm:

Bulk specific gravity (SSD):Abrasion loss, % (LAM):

Moisture content, %:Bulk specific gravity (SSD):

Absorption, %:Moisture content, %:

Unit weight (loose), kg/m3:Absorption, %:

Specific gravity of cement:Dry unit weight (loose), kg/m3:

DESIGN SPECIFICATION REQUIREMENTS:

Class of concrete:Slump, mm:

Cement factor, bag/m3:Type of concrete:

Compressive strength, MPa:

Absolute volume of concrete, m3:

Absolute volume of cement, m3:

Absolute volume of water, m3:

Absolute volume of water and cement, m3:

Absolute volume of fine and coarse aggregates, m3:

Absolute volume of fine aggregates, % of total aggregates by absolute volume:

Fine aggregates:(from table I)

Total correction:(from table II)

Corrected fine aggregates:

Absolute volume of fine aggregates, m3:

Absolute volume of coarse aggregates, m3:

BATCH WEIGHTS:

Absolute Volume (cu. m.)Uncorrected (kg)Corrected (kg)12 x 12 x 12 (cu. ft.)

Cement

Fine aggregate

Coarse aggregate

Water

Remarks/Recommendation:

Prepared by:Checked by:Witnessed by:

Contractors Laboratory TechnicianContractors Material EngineerPDCS Engineer

Note: Condition of aggregate in saturated surface dry.

Corrected as often as moisture content of aggregate varies.

Corrected for free water or water required for absorption in field mix.

(Uncorrected Wt.) x ( 1 - % of free water)

100

or

(Uncorrected Wt.) x (1 + % of water required for absorption)

100

Uncorrected weight minus total weight of free water or plus total weight of water required for absorption.

The proportions are for starting mix only. In the course of mixing operation the quality of the concrete will be periodically checked as to the following: Workability, net water content and cement as per yield test. If found not meeting the requirements in the Materials Procedures, necessary adjustments should be made before proceeding further to insure uniform quality of concrete throughout the structure.

Based on mix having a water cement ratio of 0.57 by weight of 24.7 liters per sack of cement 76.2 mm slump and natural sand having fineness modulus of about 2.75.

For mixes having either proportion, see adjustments below.

Table I. APPROXIMATE SAND & WATER CONTENTS PER CUBIC METER OF CONCRETE

Max. size of coarse aggregateROUNDED COARSE AGGREGATEANGULAR AGGREGATE

Sand, %of total aggregate by volumeNet water content per cubic meterSand, % of total aggregate by volumeNet water content per cubic meter

mminchcu. m.kg.literscu. m.kg.liters

12.7 5119919956214214

19 4818418451199199

25.4 14117817846192192

38.1 1 3716616642181181

50.8 23415715739172172

76.2 33114814836163163

152.4 62613113131146146

Table II. ADJUSTED SAND AND WATER CONTENT FOR OTHER CONDITIONS

CHANGES IN CONDITIONS STIPULATED IN TABLE 1Effect on value in Table 1

Percent sandNet water content

Each 0.05 increase or decrease in water cement ratio+ 10

Each 0.1 increase or decrease in fineness modulus of sand + 1/20

Each 25.4 mm increase or decrease in slump 0+ 3 %

Manufactured sand+ 3+ 8.9 kg.

For less workable concrete as pavement- 3- 4.7 kg.

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