Effect of activated coal mining wastes on the properties of blended cement

被引:195
作者
Frias, M. [1 ]
Sanchez de Rojas, M. I. [1 ]
Garcia, R. [2 ]
Juan Valdes, A. [3 ]
Medina, C. [3 ]
机构
[1] Eduardo Torroja Inst CSIC, Madrid 28033, Spain
[2] Univ Autonoma Madrid, Dpto Geol & Geoquim, Unidad Asociada CSIC UAM, E-28049 Madrid, Spain
[3] Univ Leon, Dpto Ingn & Ciencias Agr, E-24071 Leon, Spain
关键词
Coal waste; Activation; Pozzolan; Blended cement; Technical properties; POZZOLANIC BEHAVIOR; CALCINATION; HYDRATION; ADDITIONS; SLUDGE;
D O I
10.1016/j.cemconcomp.2012.02.006
中图分类号
TU [建筑科学];
学科分类号
081407 [建筑环境与能源工程];
摘要
The large volumes of coal waste generated world-wide in mining operations are mostly deposited in refuse dumps, to the severe detriment of the surrounding groundwater and soil. After calcination under controlled conditions, this waste has been shown to exhibit high pozzolanicity, making it apt for use as an addition in the manufacture of blended cements. The present paper describes the first detailed study designed to evaluate the behavior of coal tailings from different sources. After activation at 650 degrees C for 2 h, this waste was used to manufacture blended cements containing 10 and 20 wt.% of the addition. Inclusion of this pozzolan did not affect the initial setting time, although the compressive strength of the blended mortars declined, by 4.7-8.3% in the 10% and by 9.76-14.9% in the 20% material. Nonetheless, the activated carbon waste (ACW) blends complied with all the requirements for Type II/A cement in the existing European legislation. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:678 / 683
页数:6
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