Effect of waste red brick powder on fresh properties and strength development of cement paste

Abstract

This study aims to assess the fresh properties and strength development of an environmentally friendly paste produced with waste red brick powder (WRP) as partial cement replacement. The WRP was collected from construction demolished waste (CDW) and ground into fine particles (<75μm). The paste samples were prepared with different WRP amounts (0%, 10%, 20%, 30% and 40 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> ) of total binder weight and the water to binder (w/b) ratio was fixed at 0.5. The flowability, fresh unit weight and setting time were used to examine the fresh properties, while the compressive strength, flexural strength and ultrasonic pulse velocity (UPV) were conducted to examine the mechanical properties of paste specimens. Incorporating WRP reduced the flowability and fresh unit weight of paste samples, while the setting time increased with a higher amount of WRP content. The 28-day compressive strength and flexural strength were improved with 10% WRP content and reduced with a high WRP content. However, the inclusion of WRP reduced the UPV results of paste samples.