Utilization of Rice Husk Ash as partial replacement with Cement for production of Concrete Brick

Rice husk ash (RHA) obtained from agricultural by-product is a potential source for partial cement replacement to produce concrete brick. Preliminary analyses were conducted to evaluate some properties of RHA at an temperature of 500degree Celsius to evaluate loss of ignition (LOI), morphology, chemical and phase compositions. Cement was replaced with RHA by weight at 10 %wt. The effects of RHA on the physical and mechanical properties of the aggregate cement bricks were investigated. Results demonstrated that the compressive strength of concrete bricks increased with age .It is recommended that further studies should be carried out to achieve optimum parameters for production of concrete brick in economic aspects.

Concrete bricks comprise of cement, fine and coarse aggregates. They are bound together tightly into a compact whole without sintering since cement has ability to be cohesive and adhesive when mixed with water. For that reason, energy and environmental issues could reduce significantly in mass production. Cement is the most expensive component among the raw materials of concrete bricks. Alternative materials have been considered in order to reduce the manufacturing cost. Every year million tons of paddies are produced are produced in India , China , Vietnam etc. This results in large amount of agricultural waste materials that are not adequately managed and utilized. Rice husk, generally considered as agricultural by-products, is mainly used for fertilizer and energy production. Rice husk ash (RHA) is obtained from the burning of rice husk. Previous predominant component of RHA is silica (SiO2). It could chemically react with calcium hydroxide (Ca(OH)2) at room temperature to achieve adhering properties and combine materials firmly. Therefore, reactive silica is also known as pozzolanic additive commonly used in cement production and the manufacture of concrete. Despite research on RHA utilization in construction materials is not new, the use of RHA as a partial replacement to cement will solve the enviromental problem of argicultural by – product as well as contribute to reduce the manufacturing cost of concrete bricks.

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Source - https://www.matec-conferences.org/articles/matecconf/pdf/2017/11/matecconf_etic2017_01121.pdf