Utilization of wastewater sludge for lightweight concrete and the use of wastewater as curing medium

Case Studies in Construction Materials

卷:15

W.K. Kupolati¹  E.R. Sadiku²  K.S. Mojapelo²  J.M. Ndambuki²  I.D. Ibrahim³ 

[1] Corresponding author.;

[2] Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa;

[3] Institute for NanoEngineering Research (INER) and Department of Chemical Metallurgy and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa;

关键词: Wastewater;    Dry sludge;    Heavy metals;    Concrete composites;   

DOI  :  

来源: DOAJ

【 摘 要 】

The increasing population have resulted in a higher generation of domestic and industrial wastewater sludge. The sludge ends up as a landfill in designated areas which makes the land unusable. The search for lightweight materials for construction has led to the use of sludge as a viable replacement for the basic composition of concrete due to its low density. The dry sludge collected from Polokwane Waste Water Treatment Works (WWTW) in Limpopo Province was used as a partial replacement of sand in concrete. The sludge content in the sand was varied from 2.5, 5, 7.5, 10, to 12.5 %. The outcomes of the analysis indicate that the partial replacement of sand with dry sludge in the concrete mix is viable and useful. The result showed that up to 7.5 % of sand could be replaced with dry sludge in concrete for structural applications. Also, wastewater can be used as a curing medium. The unit weight of the concrete decreased with increasing sludge content, which was attributed to the lower density of the sludge. The SEM image revealed a porous nature and irregular surface morphology of the sludge and the concrete.

【 授权许可】

Unknown