| Popis: |
The concrete structural requires a criteria design such as the compressive strength and modulus of elasticity. The empirical formulas to determine the value of concrete modulus of elasticity has been provided based on the compressive strength of the concrete. The theoretical value of modulus of elasticity could be different from the results obtained from experimental laboratory tests. This may be influenced by a material proportion, admixture dosage, and curing process. To determine the magnitude of these affects, the test method is made by comparing various proportions of concrete material. Experiments conducted on concrete containing sand to the aggregate ratio that is S/A 35%, 43%, and 50% with the design fc’ 55 MPa. It has the slump shown 8, 18 and 55 cm. The sample is made each 3 pieces for testing compressive strength and modulus of elasticity at 3, 7, 14 and 28 days age. This experimental explained that the same of w/c will produce the same relative compressive strength at 28 days, but modulus of elasticity for S/A variation of concrete in age 3, 7, 14 and 28 days had shown the different. The development of the modulus of elasticity value had a different pattern with the development of concrete compressive strength. The determination of concrete modulus of elasticity should take the coefficient factor that influenced by sand to aggregate ratio and admixture dosage. |
