Characteristics of Panoba Shale as an “Aglite” lightweight concrete aggregate in Kohat-Hangu districts, NW Pakistan
Keywords:
: Panoba Shale, lightweight concrete aggregates, aglite, geochemistry, physical properties.Abstract
The 21st century urbanization has strained the global housing sector to go vertical by developing high- rise buildings and skyscrapers to meet the growing accommodation demands. Concerns that were raised in designing and constructing such heavier building foundations and consequently their probable settlement have brought new dimensions in concrete technology by introducing lightweight concrete. Lightweight concrete produced from either natural or synthetic lightweight aggregates (LWA) has addressed such complications. Bloated shale used as LWA has shown remarkable results in many developed countries so it may be easily adopted in developing Pakistani construction industry too. For the present study, Panoba Shale from Kohat-Hangu region was evaluated as “aglite” LWA. The average geochemical concentration (in %wt) for studied shale exhibit silica 57%; alumina 20%; Fe2O3 9.45% and LOI 8.14% whereas, rest of oxides are in traces. Neither iron staining nor any organic impurities were found in these bloated specimens. The average physical characteristics for these aggregates exhibit; loose bulk density of 601kg/m3, clay lumps 0.7%, specific gravity 1.44 and water absorption 13% thus conforming to ASTM C330 specifications for structural LWA. The abundance of essential raw material (shale) and the availability of required energy resources for its processing make the study area an ideal location for the installation of LWA manufacturing plants. The end- product can be marketed in neighboring major cities of northern Pakistan (Islamabad and Peshawar), boosting economic activities in the area and bringing new dimensions in construction industry of the region.
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