International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Effect of Effective Porosity and Saturated Water Absorption on Rice Husk Ash-Filtered Sand Self-Compacting Concrete Manjunath N K1, Lohith Kumar B C2, Annapurna B P3, Pavan Kumar Jogi4 1,2Assistant
Professor, Dept. of Civil Engg, Madda Walabu University, Bale Robe, Ethiopia
3Assistant
Professor, Faculty of Engineering-Civil, U.V.C.E, Bangalore-560056
4Assistant
Professor, Dept. of Civil Engg, AASTU, Addis Ababa, Ethiopia
----------------------------------------------------------------------------------------------------------------------------------------------------------Abstract- Experiments were conducted to study the effect of rice husk ash and filtered sand on the durability properties such as effective porosity and saturated water absorption. In this study M70 grade concrete with rice husk ash, filtered sand and superplasticizer were used. Cement and sand was replaced at the levels of 5%, 10%, 15%, 20% and 25%, 50%, 75%, 100% respectively. From the test results, it was observed that rice husk ash SCC and rice husk ash filtered sand SCC has shown better performance than conventional concrete.
From the middle of 20th century, there had been an increase in the consumption of mineral admixtures by the cement and concrete industries. This increasing demand for cement and concrete is met by partial cement replacement. Substantial energy and cost savings can result when industrial by-products are used as a partial replacement for the energy intense Portland cement. The use of by-products is an environmental– friendly method of disposal of large quantities of materials that would otherwise pollute land, water and air. The current cement production rate of the world, which is approximately 1.2 billion tones/year, is expected to grow exponentially to about 2 billion tones/year by 2015. Most of the increase in demand will be met by the use of supplementary cementing materials.
Keywords: Durability, Self-Compacting Concrete (SCC), Rice Husk Ash (RHA), Filtered Sand (FS)
1.0 INTRODUCTION
Prior to 1970, RHA was usually produced by uncontrolled combustion and the ash so produced was crystalline and possessed poor pozzolanic properties. In 1973, Mehta published the first of several papers describing the effect of pyro processing parameters on the pozzolanic reactivity of RHA. Based on his research, Pitt designed a fluidized bed furnace for controlled burning of rice husks. By burning the rice husks under a controlled temperature and atmosphere, a highly reactive RHA was obtained. The utilization of RHA as a pozzolanic material in cement and concrete provides several advantages, such as improved strength and durability properties, reduced materials cost due to cement savings and environmental benefits related to the disposal of waste materials.
Concrete is a widely used construction material for various types of structures due to structural stability and strength. All the materials required producing such huge quantities of concrete come from the earth’s crust. Thus, it deflects its resources every year creating ecological strains. On the other hand, human activities on earth produce solid wastes in considerable quantities of over 2500/MT per year, including industrial wastes, agricultural wastes and wastes from rural and urban societies. Recent technological development has shown that these materials are valuable as inorganic and organic resources and can produce various useful products. Amongst the solid wastes, the most prominent ones are fly ash, blast furnace slag, rice husk ash, silica fume and demolished construction materials.
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