Concrete Test

Laboratory Tests Purposes

The tests were carried out on the fresh concrete for strength and baccilus subtilus bacteria samples to know which of the bacteria samples has high calcium with oxygen and carbondioxide to form calcite which could heal its own hairline cracking, heal tiny cracks as well arrest the seepage of water.

3.3.1 Laboratory Tests Conducted

There are two categories of tests conducted namely: Concrete and bacteria test

Group A: Test on Concrete

1. Slump test

2. Compressive strength

3. Split-tensile Strength

4. Flexural strength

Group B: Test on Bacteria

1. Bacteriological Oxygen demand

2. Chemical oxygen demand

3. Physical Test i Conductivity ii. PH iii. Temperature iv. Salinity

v. Total Dissolve solid

4. Calcium test

5. Carbondioxide

Most simple workability test on fresh concrete with low cost and immediate results. Workability of concrete illustrates the ease or difficulty with which the concrete is handled, transported as well placed between the forms with minimum homogeneity loss. Concrete slump test is done from batch to batch to check concrete uniform quality during construction. The slump is performed as per techniques mentioned in ASTM C143 in the United States, IS: 1199 – 1959 in India and EN 12350-2 in

Specimen: 3 cubes of 15 cm size Mix. M20

Mixing of Concrete for Cube Test: Mix the concrete either by hand or in a laboratory batch mixer. Hand mixing was used for this experiment.

Hand Mixing: Mix the cement and fine aggregate until the mixture is thoroughly blended and is of uniform color, add coarse aggregate and mix until the coarse aggregate is uniformly distributed throughout the batch, add water and mix until the concrete looks homogeneous and of the desired consistency.

Sampling of Cubes for Test: Clean the mounds and apply oil, fill the concrete in the molds in three layers, compact each layer with 25strokes per layer uniformly distributed using a tamping rod of steel bar 16mm diameter and 60cm long, bullet pointed at lower end three times and level the top surface then smoothen it with a trowel.

Curing of