Volume No. 9 Issue No.: 3A Page No.: 960-970 January-March 2015




Harsha H. N., Radhakrsihna*1 and Devanand R.2

1. Department of Civil Engineering, R. V. College of Engineering, Bangalore (INDIA) 2. Department of Civil Engineering, Government Engineering College Hassan, Bangalore (INDIA)


Received on : September 15, 2014




One of the reasons for the environmental pollution is the unscientific processes and disposal of waste materials. The best way to dispose the waste materials is to use them in the construction. Among many materials, coal ash and granite dust are by-products of industries which have high potential to use in making building blocks. Use of coal ash reduces the cement composition which in turn reduces the burden on the raw materials for the manufacturing of cement. It also saves the fuel used in the kiln in turn conserving the energy and reduces the carbon dioxide emission thus reducing the air pollution. In the present study, an attempt has been made to explore the potential of these two materials. Coal ash was obtained from brick industry where coal is used as fuel in the kiln and granite dust obtained from granite processing unit. They were characterised for different properties. They were used in making of stabilised mud blocks which is a better alternative for regular burnt bricks in masonry by using 5 to 12% of cement. The compressive strength and other properties were determined at 7 and 28 days. Various tests like block density, wet and dry compressive strength, water absorption, efflorescence, dimensionality, durability, stressstrain characteristics of blocks and prisms were conducted. It was found that stabilised mud blocks with 4% Ce + 4% CA was considered optimum as it satisfied the minimum strength criteria of class 30 grade as per IS 1725-1982. Thus coal ash and granite dust can be recommended to make stabilised mud blocks


Keywords : Coal ash, Granite dust, Stabilised mud blocks, Masonry, Block density