A Study on Low Performance Concrete Using Mineral Admixtures (Brick Kiln Dust and Silica Fume)

The mix proportions should be prepared in such a way that the coarse aggregate participation in volume should be reduced and the fine aggregate in the powder form is to be increased. In present work, cement is a permanent agent, the replacement of cement by Silica Fume in percentages namely(0% 5%,10%and 15%) and Brick Kiln Dust (BKD) in percentages namely ( 0% 5%,10% and15%) with W/C ratio of 0.50 the study on fresh properties of LPC; Compressive strength and split tensile strength of LPC were made. it was found that the replacement of cement by15% silica fume (FA) and 10% Brick kiln Dust (BKD) gives maximum compressive strength and split tensile strength respectively Dumping of brick dust and other waste brick particles, flakes etc., not only occupy land but also create environmental problems. The problems could be reduced to a large extent by using these waste materials in cement concrete. The reasons for using brick dust include economical gain and beneficial modification of certain properties of fresh and hardened concrete elements. This study gives an overview of the physical and chemical properties of brick dust as a mineral admixture (BDMA), which is dumped as waste from brick and tile factories in Bangladesh. Various properties of brick dust have been studied. Experimental results indicate that brick dust could be used for partial replacement of cement in concrete. Concrete cubes prepared with 20% cement replaced by brick dust (BDMA) shows compressive strength comparable to concrete cubes prepared with Portland cement only. Concrete prepared with 20% cement replaced by BDMA also shows good resistance to chemical attack, specially the sulfate attack. They also show better pore refinement after long period. Chemical composition and lime reactivity strength of brick dusts have been found to be within the range given for good pozzolanic material. The pore refinement and relatively low heat of hydration in the presence of BDMA show that certain properties of concrete could be improved by using brick dust in combination with Portland cement.India is the second largest producer of clay fired bricks, accounting for more than 10 percent of global production. India is estimated to have more than 100,000 brick kilns, producing about 150-200 billion bricks annually, employing about 10 million workers and consuming about 25 million tons of coal annually. India's brick sector is characterized by traditional firing technologies; environmental pollution; reliance on manual labour and low mechanization rate; dominance of small-scale brick kilns with limited financial, technical and managerial capacity; dominance of single raw material.