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砖工业固体废弃物与熟石灰在自密实水泥浆体中的应用

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

作者信息

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

机构信息

School of Civil and Environmental Engineering, National University of Sciences and Technology (NUST), H-12 Sector Islamabad 46000, Pakistan.

出版信息

Materials (Basel). 2021 Feb 27;14(5):1109. doi: 10.3390/ma14051109.

DOI:10.3390/ma14051109
PMID:33673473
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7956721/
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.

摘要

砖制造行业产生的大量固体废弃物可作为水泥替代品。然而，替代量超过10%会因火山灰反应减缓而导致强度降低。因此，在本研究中，使用超细砖粉与熟石灰（HL）来提高砖废料的火山灰活性。总共研究了六种自密实浆体混合料。在两种配方中添加了占粘结剂重量2.5%的HL：10%和20%的废烧砖粉（WBBP），以激活火山灰反应。随着WBBP替代率的增加，观察到需水量和凝结时间增加。结果发现，含5%和10%WBBP的混合料的力学性能优于对照混合料，而含20%WBBP的混合料在90天时的力学性能几乎与对照混合料相当。HL的添加提高了早期强度。此外，WBBP配方在耐久性和流变性能方面均有改善，同时早期收缩减小。总体而言，发现超细尺寸的砖废料具有很高的火山灰活性，可有效用作辅助胶凝材料。

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