Use of Binary Cementitious Systems Containing Lime Sludge and Wollastonite Powder in Concrete

Abstract

An important environmental concern is the wide use of cement in the construction industry. In this scenario the cement usage should be reduced using supplementary cementitious materials like Lime-sludge (LS) and Wollastonite-powder (WP). LS and WP, due to their properties and environmental friendliness they have a huge potential as replacements to Ordinary Portland cement (OPC). Using LS and WP as partial replacements in cement long term sustainable cement concrete can be produced. In the current study a novel process is implemented to produce a long-term sustainable concrete using Lime sludge and Wollastonite powder to form binary mixes and validate it by mechanical properties of M30 grade concrete. Cement was partially replaced with mineral admixture lime sludge at 5%, 10%, and 15% by weight of cement to form a binary blended mix and by wollastonite at 10%, 15%, and 20% by weight of cement to form a second binary blended mix. To make a comparison, the strength properties of both the control mix and the blended concrete mixes are determined. The concrete used in this study performed better when mineral admixtures were added. The blended mix concrete had enhanced strength. It was concluded that LS10 and WP15 performed better in terms of strength.