Utilization of Solid Waste from Brick Industry and Hydrated Lime in Self-Compacting Cement Pastes.

Muhammad Usman,Sara Farooq,Iqra Naseem,Mati Ullah Shah,Muhammad Usman Hanif

doi:10.3390/ma14051109

Muhammad Usman, Sara Farooq + Show 3 more

Open Access

https://doi.org/10.3390/ma14051109

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Abstract

The huge amount of solid waste from the brick manufacturing industry can be used as a cement replacement. However, replacement exceeding 10% causes a reduction in strength due to the slowing of the pozzolanic reaction. Therefore, in this study, the pozzolanic potential of brick waste is enhanced using ultrafine brick powder with hydrated lime (HL). A total of six self-compacting paste mixes were studied. HL 2.5% by weight of binder was added in two formulations: 10% and 20% of waste burnt brick powder (WBBP), to activate the pozzolanic reaction. An increase in the water demand and setting time was observed by increasing the replacement percentage of WBBP. It was found that the mechanical properties of mixes containing 5% and 10% WBBP performed better than the control mix, while the mechanical properties of the mixes containing 20% WBBP were found to be almost equal to the control mix at 90 days. The addition of HL enhanced the early-age strength. Furthermore, WBBP formulations endorsed improvements in both durability and rheological properties, complemented by reduced early-age shrinkage. Overall, it was found that brick waste in ultrafine size has a very high degree of pozzolanic potential and can be effectively utilized as a supplementary cementitious material.

Highlights

Self-compacting concrete (SCC) is an unconventional and revolutionary concrete technology
The waste burnt brick powder (WBBP) particles are very fine in size and have a large surface area that increases the water demand
scanning electron microscopy images (SEM) images indicate that the particles of WBBP are irregular with a rough surface, which might be a reason for the increased water demand (WD) of the formulations containing WBBP [74]

Summary

Introduction

Self-compacting concrete (SCC) is an unconventional and revolutionary concrete technology It can flow under its own weight without bleeding and segregation and can achieve full compaction without any mechanical effort [1,2]. These unique properties of SCC are attributed to the high volume of self-compacting paste (SCP) in SCC [3]. SCP properties are governed by the chemical properties of supplementary cementitious material (SCM) and the physical properties such as particle shape, size, and morphology.

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