lab report building kontruction

LAB REPORT

Concrete Slump Test

PREPARED FOR : Mrs. KARYATI Spd.

By : Achsanul chusna XII TKBB 01

February 24, 2014

1.       INTRUDUCE

Slump test is an empirical test / method used to determine the consistency / rigidity ( feasible or not ) of freshly mixed concrete ( fresh concrete ) to determine the level of its workability . Stiffness in a concrete mix shows how much water is in use. For the slump test indicates whether the concrete mixture deficiency , excess , or enough water .
In a mortar / concrete mix , water content is of considerable concern because of its workability determines the level or not . Liquid concrete mixture that is too low will cause the concrete quality , and longer to dry . While the mixture is too dry concrete mix causing uneven and difficult to print .
Slump test refers to ISO 1972-2008 and ICS 91.100.30
Slump can be done in the laboratory and in the field ( usually when ready mix up , tested every arrival ) . The results of the concrete is Slump Test Slump value . Values ​​shown are expressed in international units ( SI ) and have standards .

2.       MATERIAL AND METHODS

MATERIALS

1.Fresh concrete (fresh concrete) taken at random in order to represent the overall concrete.

EQUIPMENT:
1. Truncated cone (pointy cone part is lost) as a slump mold. Bottom diameter 30 cm, diameter of 10 cm, height 30 cm.
2. Round metal rod with a length of ± 50 cm in diameter 10-16 mm.
3. Flat metal plate as base and water-resistant
4. spoon mixture
5. Measure tape

TEST PHASE Slump:
1. Dampen the mold cone and plate with a damp cloth
2. Place the mold on a plate
3. Fill 1/3 molds with fresh concrete, condense as much evenly with a metal rod with a thrust. This layer is done by pricking the edges of the iron is tilted in accordance with the mold wall. Make sure the iron touch the bottom. Perform 25-30 x prick.
4. Fill 1/3 the next section (be filled 2/3) with the same thing as much as 25-30 x prick. Make sure the iron touch the first layer.
5. Fill 1/3 as the final stages of number 4
6. Once completed compacted, flatten the specimen surface, wait about half a minute. While waiting outside wipe excess concrete in the mold and plate.
7. Mold slowly lifted straight up
8. Measure the value of slump with reverse cone next to it using the average difference in height of the specimen.
9. Tolerance values ​​of fresh concrete Slump ± 2 cm
10. If the slump value in accordance with the standards, the concrete can be used

3.       RESULTS AND DISCUSSION

VALUE CALCULATION Slump :
VALUE = High Slump mold - the average height of the test specimen

Slump value standard commonly used :
0-25 mm for highway
10-40 mm for the foundation (low workability)
50-90 mm ​​for normal reinforced concrete using vibrators (medium workability)
> 100 mm for high workability

4.       CONCLUSION

The advantages of Slump Test is to be done by all people: easy to do and easy to measure, even by artisan / worker though. So this test is more popular than other tests and is still used , so do not pass the test concrete slump will not be used in the field, because if forced will damage the road or the building itself, all the existing laws and regulations will be subject to sanctions if violated

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