Coal Mine Overburden As Resource Material For Making Brick

Coal Mine Overburden As Resource Material For Making Brick
  IJETT-book-cover           
  
© 2022 by IJETT Journal
Volume-70 Issue-1
Year of Publication : 2022
Authors : A. S. Rathore, Manoj Pradhan, S. V. Deo, A. K. Dash
DOI :  10.14445/22315381/IJETT-V70I1P213

How to Cite?

A. S. Rathore, Manoj Pradhan, S. V. Deo, A. K. Dash, "Coal Mine Overburden As Resource Material For Making Brick," International Journal of Engineering Trends and Technology, vol. 70, no. 3, pp. 118-125, 2022. Crossref, https://doi.org/10.14445/22315381/IJETT-V70I1P213

Abstract
The coal mine`s overburden (CMOB) waste rock consists mainly of sandstone and shale. Among these two, sandstone predominates. Sandstone found with coal seam is generally argillaceous, and hence sand and cementing materials, which are clay minerals, can be easily segregated by simple crushing and washing. An attempt to utilize CMOB clay separated from overburden is made. Three types of mixes of sand and clay are used for the preparation of compressed stabilized earth brick (CSEB) specimens by varying clay and sand percentages. Tests were conducted on these bricks for determining the important parameters influencing the quality of brick viz. dry density, compressive strength both dry and wet, water absorption, and weathering tests.
The CSEB brick specimens were prepared with pure CMOB clay and stabilized with 8% and 10% Portland cement. The average density of the CSEB specimens fabricated with different mixes is found to vary between 1705 kg/m3 to 2142 kg/m3, respectively. Due to the poor texture of CMOB clay, the water absorption and weight loss due to alternate wetting and drying of the brick were found very high. The texture of CMOB clay is improved for the production of CSEBs, by blending it with 57% of CMOB sand. As the texture of the CMOB clay is improved, both the dry and wet compressive strength of the CSEB specimens also improved significantly. The water absorption of the specimens prepared with Clay:Silt: Sand ratios of 22:60:18 and 19:53:28 exceeded the limit prescribed in the code, whereas the water absorption of the specimen prepared with Clay:Silt: Sand ratio of 09:26:65 is found well within the limit. The tests also exhibited that the weight loss due to abrasion from the wire brush significantly reduced with improvement in the texture of the soil mixes.

Keywords
Compressed stabilized earth brick (CSEB), coal mines overburden (CMOB), mine waste utilization.

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