Beneficiation of stockpiled fluidized bed coal ash in road base course construction

被引：12
|
作者：
Mejeoumov, Gleb G. [2 ]
Shon, Chang-Seon [1 ]
Saylak, Don [1 ]
Estakhri, Cindy K. [3 ]
机构：
[1] Texas A&M Univ, Zachry Dept Civil Engn, College Stn, TX 77843 USA
[2] Pavil Technol, Austin, TX 78759 USA
[3] Texas A&M Univ, Texas Transportat Inst, College Stn, TX 77843 USA
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2010年 / 24卷 / 11期
关键词：
Circulating fluidized bed combustion ash; Stockpiled ash; Base course construction;
D O I：
10.1016/j.conbuildmat.2010.04.055
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The presented paper investigates the potential for the utilization of unprocessed, as excavated (i.e. unground), stockpiled coal combustion fluidized bed ash in road base course construction. In addition to functioning as a stabilizer of the fines in the stockpiled material, this ash also permits treating the stockpiled ash agglomerates as an aggregate. Both untreated and cement-treated mix designs were evaluated. The laboratory program included unconfined strength measurements, triaxial, volumetric swell, and moisture susceptibility testing protocols performed on cylindrical specimens compacted at their optimum moisture content. The results have shown that, without breaking down the agglomerates by grinding, the unstabilized stockpiled ash possesses very little residual cementitious activity; whereas, if treated with small amounts of cement (3%), it meets the required strength criteria for cement-treated base courses while minimizing the volumetric swell characteristics. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2072 / 2078
页数：7
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