Strength Properties of Self-Compacting Concrete (SCC) Produced With Opepe Saw Dust Ash (SDA) Addictive

Concrete is one of the widely used materials in the construction world. It is primarily made up of cement, fine aggregates, coarse aggregates and water, pozolanic materials and super plasticizer can be added based on demand. For over 150 years, concrete as proven to be a very good construction material. As the demand for concrete increases, the demand for cement also increases. Thus there is a linear relationship between the demand for concrete and volume of cement needed. Self-compacting concrete mix was designed by using the same constituent materials as those for conventional concrete mix, but their relative proportions were different. The mix design was done by considering past projects and EFNARC guidelines. The Pozolanic reactivity test was carried out for different samples of opepe sawdust ash at different temperatures of 4000C, 5000C, 6000C, 7000C, 8000C, 8500C, 8700C and 9000C. The Pozolanic reactivity of the sawdust ash was determined by Chappelle test in accordance to NF P 18-513. The test is necessary to check the optimum calcined temperature of Sawdust. For this test, two samples which include the blank and the pozolanic mixture were used. The blank sample contained 2g of calcium oxide (CaO) mixed with 1g of Sawdust ash for different temperatures of 400-800oC at intervals of 100oC, other temperatures were 850oC, 870oC and 900 oC. The compressive and tensile strength test was carried out for the samples and it was deducted that samples at 10% are more efficient. As regards the other mixes, the strength of Self Compacting Concrete mixture containing opepe Saw Dust Ash dosages beyond 10% were lower in strength than mixture without opepe Saw Dust Ash irrespective of curing age.