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.
- 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
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
Slacken all nuts Part the sides of the mould, tapping
gently with the hammer Lift off the cube carefully
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%
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
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)
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.
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
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
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