Utilization of Waste Polysilicon Sludge in Concrete

Abstract

Increasing use of cement in the construction industry is causing an alarming increase in carbon dioxide (CO2) emissions, which is a serious environmental threat, it can be reduced by the addition of supplementary cementitious materials (SCMs). The commonly used SCMs like ground granulated blast furnace slag (GGBS), metakaolin (MK) and fly ash (FA) have been successfully used to replace the cement partially or completely. Polysilicon sludge obtained from the photovoltaic industry is also a type of waste material that can be used as SCM because it has high content of reactive SiO2. This study investigates the effects of replacing cement with polysilicon sludge in concrete. Different concrete specimens were made by replacing varying proportions of cement with polysilicon sludge and their properties, such as, fresh properties, compressive strength, heat release, chloride penetration, freeze/thaw resistance and microstructural investigations were determined. The results demonstrate that the polysilicon sludge can be used effectively to replace cement, and environmental threats associated with its disposal can be reduced.

Utilization of textile denim sludge waste in high load-bearing structural applications

“…Another study showed the decrease in compressive strength of concrete when cement was replaced with dried sewage sludge [26]. Incorporating the waste polysilicon sludge in concrete up to 20% replacement level resulted in the increase in compressive strength after 28 days of curing period [27]. The amounts of both dry and wet waste water sludge can be used up to 15% as an additive without causing considerable reduction in concrete compressive strength, because of the fact that sludge acts as filler materials responsible for improving the mechanical properties of concrete mix [28].…”

Utilização de lodo tratado de indústria de produtos de limpeza em matrizes cimentícias

“…Em alguns casos como na incorporação de lodo de papel, a considerável atividade pozolânica do material proporciona um refinamento da microestrutura e permite que os concretos com resíduo obtenham maiores resistências à penetração dos íons cloreto [79], comportamento não constatado nos concretos com lodo de produtos de limpeza. Materiais suplementares contendo alumínio em sua composição também podem ser capazes de adsorver os íons de cloreto para formais sais, reduzindo a quantidade de íons livres na estrutura de poros e consequentemente a taxa de penetração desse agente em concretos [80].…”