Northern Fluminense State University, Laboratory of Advanced Materials, Group of Ceramic Materials, 28013-602 Campos dos Goytacazes, RJ, Brazil.
J Environ Manage. 2013 Dec 15;131:1-6. doi: 10.1016/j.jenvman.2013.09.040. Epub 2013 Oct 17.
This investigation focuses on the reuse of grits waste as a raw material for replacing Portland cement by up to 30 wt.% in soil-cement bricks. The grits waste was obtained from a cellulose factory located in south-eastern Brazil. We initially characterized the waste sample with respect to its chemical composition, X-ray diffraction, fineness index, morphology, pozzolanic activity, and pollution potential. Soil-cement bricks were then prepared using the waste material and were tested to determine their technological properties (e.g., water absorption, apparent density, volumetric shrinkage, and compressive strength). Microstructural evolution was accompanied by confocal microscopy. It was found that the grits waste is mainly composed of calcite (CaCO3) particles. Our results indicate that grits waste can be used economically, safely, and sustainably at weight percentages of up to 20% to partially replace Portland cement in soil-cement bricks.
本研究以巴西东南部一家纤维素工厂产生的废渣为原料，探讨了废渣替代高达 30wt.%波特兰水泥用于制备土壤水泥砖的可行性。首先对废渣的化学组成、X 射线衍射、细度指数、形貌、火山灰活性和潜在污染性进行了表征。然后使用废渣制备土壤水泥砖，并测试其技术性能（如吸水率、表观密度、体积收缩和抗压强度）。采用共聚焦显微镜观察微观结构演变。结果表明，废渣主要由方解石（CaCO3）颗粒组成。研究结果表明，废渣可经济、安全和可持续地应用于土壤水泥砖中，在不超过 20wt.%的掺量下，部分替代波特兰水泥。
