Exploring the Influence of Rice Husk Ash on Compressive Strength: Experimental Investigations in Construction Materials

Abdullha Mudhafar Shawka AL-obaidi

Abstract

This paper aims to know the effect of rice husk ash on compressive strength 6 molds were collected and laboratory tests were conducted in cooperation with private laboratories in Baghdad Governorate, Iraq. The tests were conducted for a period of 7 and 28 days, where the samples were divided into 1 control and 5 samples distributed on a different percentage from 5% to 25% of the rice husks. The compressive strength and properties of concrete, which is one of the most important properties of concrete at all, and expresses the degree of its quality and suitability, were determined. In this paper, a study of the behavior of concrete was carried out, by designing a mixture by replacing the volume percentages of cement with rice husk ash (RHA), which is burned in the industrial process of the Baghdad rice factory. Characterization of the ash was performed and it was found to have a content of silicon dioxide 87.23%, and aluminum oxide 0.2. The samples were tested according to Iraqi specification standards which resulted in the collection of 6 samples with processing ages ranging from 7 to 28 days. The results were compared with the control group samples without adding RHA and has been found the compressive strength increased with the increase of the addition, and its highest percentage was reached with 10% weight of cement, and the percentage increase became 23.41% with age 28 days and 12.6% with age 7 days. The results showed that the super-resistant concrete showed an increase in the dynamic modulus of elasticity compared to the reference mixture. The results showed that the super-resistant concrete containing RHA 10% contributed to increasing the compressive strength at the age of 28 days, and this is based on a direct relationship in this study.

Abstract

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