Building Construction Technology
BUILDING CONSTRUCTION TECHNOLOGY
Task-1 1.1 Explain the quality control testing before you allow starting the concreting work for the foundation, columns, slab and beams. There are two main tests to be done on concrete The slump test: the slump test shows the workability of concrete. The compression test: the compression test shows the best possible strength Concrete can reach in perfect conditions. Testing should always be done carefully. Wrong test results can be costly. SAMPLING The first step is to take a test sample from the large batch of concrete. This should be done as soon as discharge of the concrete commences. The sample should be representative of the concrete supplied. The sample is taken in one of two ways: For purposes of accepting or rejecting the load: Sampling after 0.2 m3 of the load has been poured. For routine quality checks: Sampling from three places in the load.
THE SLUMP TEST
The slump test is done to make sure a concrete mix is workable. The measured slump must be within a set range, or tolerance, from the target slump. Tools Standard slump cone,(100 mm top diameter x 200 mm bottom diameter x 300 mm high) Small scoop, Bullet-nosed rod,(600 mm long x 16 mm diameter) Rule, Slump plate (500 mm x 500 mm). Method 1. Clean the cone. Dampen with water and place on the slump plate.
1|P a ge
U.M.NAWEETH
BUILDING CONSTRUCTION TECHNOLOGY
The slump plate should be clean, firm, level and non-absorbent. 2. Collect a sample. 3. Stand firmly on the foot pieces and fill 1/3 the volume of the cone with the sample. Compact the concrete by 'rodding ' 25 times. 4. Now fill to 2/3 and again rod 25 times, just into the top of the first layer. 5. Fill to overflowing, rodding again this time just into the top of the second layer. Top up the cone till it overflows. 6. Level off the surface with the steel rod using a rolling action. Clean any concrete from around the base and top of the cone, push down on the handles and step off the foot pieces. 7.
Task-1 1.1 Explain the quality control testing before you allow starting the concreting work for the foundation, columns, slab and beams. There are two main tests to be done on concrete The slump test: the slump test shows the workability of concrete. The compression test: the compression test shows the best possible strength Concrete can reach in perfect conditions. Testing should always be done carefully. Wrong test results can be costly. SAMPLING The first step is to take a test sample from the large batch of concrete. This should be done as soon as discharge of the concrete commences. The sample should be representative of the concrete supplied. The sample is taken in one of two ways: For purposes of accepting or rejecting the load: Sampling after 0.2 m3 of the load has been poured. For routine quality checks: Sampling from three places in the load.
THE SLUMP TEST
The slump test is done to make sure a concrete mix is workable. The measured slump must be within a set range, or tolerance, from the target slump. Tools Standard slump cone,(100 mm top diameter x 200 mm bottom diameter x 300 mm high) Small scoop, Bullet-nosed rod,(600 mm long x 16 mm diameter) Rule, Slump plate (500 mm x 500 mm). Method 1. Clean the cone. Dampen with water and place on the slump plate.
1|P a ge
U.M.NAWEETH
BUILDING CONSTRUCTION TECHNOLOGY
The slump plate should be clean, firm, level and non-absorbent. 2. Collect a sample. 3. Stand firmly on the foot pieces and fill 1/3 the volume of the cone with the sample. Compact the concrete by 'rodding ' 25 times. 4. Now fill to 2/3 and again rod 25 times, just into the top of the first layer. 5. Fill to overflowing, rodding again this time just into the top of the second layer. Top up the cone till it overflows. 6. Level off the surface with the steel rod using a rolling action. Clean any concrete from around the base and top of the cone, push down on the handles and step off the foot pieces. 7.
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