QC Department

 Must do slump test before making our cubes to ensure the concrete is usable. If the slump test fails to meet the range limit then the load should be rejected.

1. TYPES OF SLUMP

- Normal slump = 80 +/- 25(4 in)- Pump slump = 100 +/- 25(5in)- Tremie 1 = 125 +/- 25- Tremie 2 = 175 +/- 25 (7 in)- Tremie 3 = 220+/- 40 (8 in) &

= the flow 600+/- 100

2. APPARATUS 1)

SLUMP CONE

SLUMP ROD

SLUMP PLATE

Place the damp slump cone on a flat, hard surface. Fill the concrete sample at the cone until 3 layers. Once each stage is filled, tamp the mix with the tamping rod 25

times. After the third tamping the excess concrete shall be struck off

flush to the top of the cone. Lift the mould carefully upwards with 3 second, to minimise

disturbance of the concrete inside. The slump is measured by placing the cone just besides the slump

concrete and the temping rod is placed over the cone so that it should also come over the area of slumped concrete. Measure the difference in height in mm between the top of the cone and the top of the highest point of the concrete

Check that the moulds are clean and lightly oiled with all bolts tightened so that there will be no leakage

Fill the mould with concrete in 50 mm layers using the tamping bar. Compact the concrete with no fewer than 35 tamps for each of the three layers in a 150 mm mould

After tamping of each layer, tap the sides of the mould with the hammer until the sample of concrete compact at the hole left with air space .

Remove surplus concrete and clean around the mould

•Complete the sampling and label the cube

Slacken all nuts Part the sides of the mould, tapping

gently with the hammer Lift off the cube carefully

•MARKING •CURING

Use crayon to marking

Must curing after 24 hour…

•USE CRUSHING MACHINE

1 day – 25% 3 days – 50% 7 days – 75% 14 days – 100% 28 days – 125%

DENSITY (Kg/m3) Example Calculation:-

150mm X 150mm X 150mm= (change to m3)

0.15mm X 0.15mm X 0.15mm= 0.003375m3

Density = kg/m3

= 8.0kg/0.003375m3

=2370kg/m3

CUBE DIMENSION WEIGHT

150mm X 150mm X 150mm

8.0

Example calculation:- 1 Pa = 1N/mm2

1 Mpa = 1000KN/m2

= (area of mould m2 X 1000) = 0.15m X 0.15m x 1000 = 22.5 kn

To determine the percentage and the fine modulus(FM) Fine Modulus for Mining sand = 2.6 to

3.2 (if 3.2 above the sand is too coarse) Fine Modulus for M.Sand = 2.6 to 3.0

(if 3.0 above the sand is too coarse) For 20 mm aggregate achieve the passing

allowable 10 mm is 30% to 60%

WEIGHING SCALE SIEVE SETS

OVEN SIEVE SHAKER

RIFFLE BOX (AGGREGATE) REFFLE BOX (SAND)

1. Divide coarse aggregate/ fine aggregate(sand) in two place use the riffle box

2. Choose one of the tray3. Then weighing the coarse aggregate 3 kg

& for sand 600gram/ 0.60kg

FINE AGGREGATE

(SAND)

COARSE AGGREGATE

5. Take the reading of the coarse aggregate & fine

aggregate (sand) after drying .Other than that, can

know the moisture of fine aggregate(sand)

6. Make sure that all sieve are clean, and assemble

them in the ascending order of sieve number.

Carefully pour the soil & aggregate sample into the

top sieve and place the cap over it.

7. Place the sieve stack in the sieve shaker and shake

for 10 minutes

8. Remove the stack from the shaker and carefully weigh and record the weight of each sieve with its retained soil & aggregate. In addition. Remember to weigh and record the weight of the bottom pan with its retained fine soiled.

Coarse Aggregate Fine Aggregate(Sand)

Mining Sand

1. Accumulative Weight Retained

30 + 10 = 4030 + 10 = 40

10.00 / 560(total of weight retained ) X 100 = 1.8

100-1.8 = 98.2

Add the cumulative % retained from 10mm sieve size until 0.150mm sieve size and devided by 100

Take the reading of the sand after drying to know the moisture content of sand.

- Formula :-MS = Weight density-Dry Density X 100 - 0.7 Dry Density

To determined the content percentage of clay and silt in the sand not more

than the specified limit.

Glass Cylinder Sodium hydroxide

sand

Weighing the sand 200 gram @ 0.20 kg Add sand into the cylinder Then add the water mix with sodium

hydroxide to the same cylinder until the total volume in the measuring cylinder reach the 300ml level.

Hold the measuring cylinder and cover the measuring cylinder . shake it for a while.

Place the cylinder on a flat surface. Allow it to stand over the same place in a

stable way for a period minimum 6 hour. Measure the silt of sand.

Sodium hydroxide

Silt

Sand

Formula:- Total of silt/total of sand & silt X 100

Example :- 10/135 x100 =7.41 %

Color chart :- 1

For silt test will accept 8% below and if above 8% the sand can’t be used. Therefore, for color chart will accept until 3 and above 3 the sand very dirty.

N30400A2 N = Normal 30= Grade 4 = Slump 0 =Same Grade 0= Natural sand(mining ) A= 30% GGBS 2= no additional opc/cementitios

N normally use for lower grade G10-G25 (N254)

S normally use for upper grade G30 above(S304)

Flow mix normally use G (G558) N change to special become P S change to special become J K is use blanded sand Q is 1 grade lower (J404Q0A1) R is 2 grade lower (J404R0A1)

EVERYDAY BY WEEK Technician

attendance Arrangement

technician (am & pm) Incoming raw

material (am& pm) Control mix Plant performance NCR update for

internal Witness cube test Sign result

Control mix update result

Plant performance update result for all plant

Incoming raw material update

ISO NCR update to GM

MONTH OTHERS(INDEPENDENT)

Independent invoive (BSEN,Geolab,Cast Consult,BIG I)

Bill utilities(SAJ,TNB,Telekom)

ISO OT & Cube Claim

Tehnician

Correspondence propose letter

Correspondence official result with letter head

Witness independent test(core , windsor & etc)

NO

PLANT NAME PLANT CODE LAST SUBMISSION

1 TAMPOI B63 5/7/2014

2 PASIR GUDANG B95 5/7/2014

3 AUSTIN B35 7/7/2014

4 SENAI B34 17/5/2014

5 GELANG PATAH B93 15/2/2014

6 MEDINI B13 -

7 TROPICANA B69 -

8 KEMPAS B65 -

9 ECOBOTANIC B10 -

10 COUNTRY GARDEN B98 -

CHARACTERISTICS A The group of test results exceeds the

specified characteristic compressive strength by grade

Any individual test result not less than the characteristic compressive strength at least

Proposed letter

Official result

GEOLAB & BIG I lab ( TEST CUBE & TRIAL MIX)

Cast consult, Geolab, BSEN & etc

NO

PLANT NAME PLANT CODE LAST SUBMIT

1 TAMPOI B63 10/07/2014

2 MEDINI B13 26/5/2014

3 AUSTIN B35 3/7/2014

4 SENAI B34 30/6/2014

5 PASIR GUDANG B95 10/6/2014

6 GELANG PATAH B93 19/5/2014

7 KEMPAS B65 22/5/2014

8 TROPICANA B69 29/5/2014

9 COUNTRY GARDEN B98 29/5/2014

10 ECOBOTANIC B10 -

Calibration equipment Sieve analysis Moisture content Silt test Cube submission log book Plant performance Control mix Design mix NCR Independent result