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原文传递 RECYCLE OF ZINC TAILING WASTE MATERIAL FOR RIGID PAVEMENT CONCRETE MIXES

题名：	RECYCLE OF ZINC TAILING WASTE MATERIAL FOR RIGID PAVEMENT CONCRETE MIXES
正文语种：	eng
作者：	A. K. Sinha;G. D. Vasantrao
作者单位：	Geotechnical Engineering Division CSIR-Central Road Research Institute New Delhi;Rigid Pavement Division CSIR-Central Road Research Institute New Delhi
摘要：	Zinc tailing is a waste material generated from zinc producing industry in huge quantity. Presently, it is partially used as a backfill material for mines and large amounts are dumped near by the producing plants. Its deposit is increasing day by day due to increase in demand of zinc. However, it has potential for application in concrete mixes (Dry Lean Concrete, DLC and Pavement Quality Concrete, PQC) for road construction as a partial replacement for sand. Physical characterisation including morphology of tailing was carried out in the laboratory. DLC/PQC concrete mixes were prepared by replacing sand with tailing (20 to 100 percent). Concrete mix samples were prepared at maximum density and optimum water content. To examine the gain in strength of mixes for road construction, mixes were cured for different periods, ranging from 7 to 28 days. The compressive strength of DLC and PQC mixes was evaluated. In addition to this, flexural strength of PQC mixes was also determined at different curing periods (7 to 28 days). To compare the behaviour of mixes, the control mix of DLC was prepared with 170 kg/m~3 of ordinary Portland cement and sand, while 420 kg/m~3 of ordinary Portland cement, aggregate, and sand at water/cement ratio of 0.39 was used in the case of PQC mix. It was observed that there is an increase in compressive and flexural strength of PQC mixes after the replacement of sand with tailing while there is a decrease in compressive strength of DLC mixes. It is inferred that tailing may be used as a partial replacement of fine aggregate in the DLC and PQC mixes up to 60 percent and 40 percent respectively for rigid pavement construction.
出版年：	2023
期刊名称：	Indian Highways
卷：	51
期：	8
页码：	34-42