Abstract
One of the biggest issues, all over the world is getting affordable house to the community. In developing countries, where it is difficult for most people to satisfy basic needs, construction of modern house is a big challenge. Different ways were tried by researchers and scholars to find alternative construction materials. One of this is replacing the costly construction material of cement with locally available material, especially with those considered as waste. Corncob is an agricultural waste, which is considered as one of binding materials. Very few researchers tried to use corncob ash as a means of producing lightweight concrete. So, this research was aimed to check whether corncob ash is used to produce lightweight concrete by replacing cement as a binding material or not. In order to reach on conclusion, corncob was collected from agricultural farmers and burned in furnace at a temperature of 850°C. The burned ash powder was sieved in order to remove coarser material and replacement of cement was done by 5%, 10%, 15%, 20%, 25%, 30%, and 35% with corncob ash. For each replacement, including control, 3 samples were prepared based on ASTM standards. After curing for 7 and 28 days in curing tank, the weight and compressive strength of samples were checked. Based on the experimental result, as the percentage of corncob ash increase, the weight of cubes decreased and 15% and above corn cob ash replacement makes concrete cubes lightweight. The compressive strength was also decreasing as the amount of replacement increase. However, up to 15% replacement, compressive strength is found within the range of concrete grade requirement.
Highlights
Shelter is one of the basic needs of human being
Workability of fresh concrete was determined using slump test. This was done for all percentage of corncob ash replacement
Even though the slump value is decreased as percentage of corn cob ash is increased, until the amount of percentage is became 20% the slump value is within the specified limit
Summary
Shelter is one of the basic needs of human being. United Nations Center for Human Settlements estimates indicated that, more than half of the urban populations in developing countries live in life and health threatening conditions [1]. Basic conventional building materials like cement and aggregates are becoming increasingly expensive due to high cost incurred in their processes, production and transportation [2]. The key factors to be considered when selecting alternative construction materials are: cost, availability of technology to implement, availability of material and attitude of community towards the materail [5]. Over 95% of the cement used in concrete throughout the world is Portland cement in its various forms [6] It is by no means a simple material, and its complexities have an impact on the properties and behavior of concrete from mixing right through to the end of its life [6]
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