Design and performance optimization of alkali-activated waste coal bottom ash/slag porous concrete

被引：14
作者：
Tan, Yi [1 ,2 ]
He, Yan [1 ,2 ]
Cui, Xuemin [1 ,2 ]
Liu, Leping [3 ]
机构：
[1] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China
[2] Guangxi Univ, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China
[3] Nanning Normal Univ, Coll Chem & Sci, Guangxi Key Lab Nat Polymer Chem & Phys, Nanning 530001, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 359卷
基金：
中国国家自然科学基金;
关键词：
Porous concrete; Rheological properties; Alkali -activated materials; Coal bottom ash (CBA); Compressive strength; Paste film thickness (PFT); PERVIOUS CONCRETE; FLY-ASH; MECHANICAL-PROPERTIES; SLAG; STRENGTH; BINDER; GEOPOLYMERS; METAKAOLIN; SHRINKAGE; AGGREGATE;
D O I：
10.1016/j.conbuildmat.2022.129413
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
When alkali-activated slag material is used in porous concrete, it has the problems of short setting time and poor operability. In this paper, the effect of coal bottom ash content on the rheological properties, the mechanical properties, porosity, permeability coefficient, and PFT of AACS-PC of the paste was investigated. The results showed that the fluidity and porosity of the paste with a water-solid ratio of 0.35 were positively correlated with the coal bottom ash content, but negatively correlated with the PFT. When the content of coal bottom ash was 20 wt% and the waterglass modulus was 1.4, the compressive strength of AACS-PC can reach 22.1Mpa and the water permeability coefficient of AACS-PC was 2.9 mm/s. Both the compressive strength and water permeability coefficient could meet the requirements of the standard of ASTM and JIS A. The addition of CBA can effectively improve the operability of alkali -activated materials in the preparation of porous concrete.
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页数：9
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