Effects of Rice-Husk Ash as Partial Replacement for Cement on Compressive Strength of Recycled Aggregate Concrete

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Author(s) Akinkurolere O. O.
Pages 777-780
Volume 3
Issue 8
Date August, 2013
Keywords Recycled Aggregate, Concrete, Water-cement ratio, Rice-Husk Ash.

Abstract

The cost of cement and other construction materials is on the increase in developing countries like Africa. This problem is further aggravated by the incessant scarcity of the cement due to high exchange rate of the local currency (which discourages importation of cement and other construction materials). Furthermore, the source of raw materials for building industries is clearly changing in many countries and more attention is being given to environmental safety regulations. Therefore, the recycled concrete aggregate has been widely reused for making different construction materials. And this is believed to have positive impact on the reservation of natural resources, prevention of environmental pollution, and cost-saving consideration of construction project. Experimental studies were carried out to evaluate the influence of Rice-Husk Ash on the Compressive strength of Recycled Aggregate Concrete. The experimental program consisted of testing 100 x 100 x 100mm concrete cubes. The experimental variables used were the Water-cement ratio, Recycled Aggregate, and Rice-Husk Ash as partial replacement for cement. Orthogonal Array table with three levels and three factors was used to prepare the mixing proportions, and Analysis of Variance and significance test with F statistic were used to check the existence of interaction and level of significance. The results indicate that the orders of significance of the three factors are: Recycled Aggregate content, Rice-Husk Ash content and Water-Cement ratio, respectively. The effects of these variables on the compressive strength of concrete are presented and discussed.

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