Effect of steam curing on compressive strength and microstructure of high volume ultrafine fly ash cement mortar

被引：114

作者：

Yang, Jin ^{[1
,2
]}

Hu, Huachao ^{[1
]}

He, Xingyang ^{[1
,2
]}

Su, Ying ^{[1
,2
]}

Wang, Yingbin ^{[1
,2
]}

Tan, Hongbo ^{[3
]}

Pan, Han ^{[4
]}

机构：

[1] Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China

[2] Hubei Univ Technol, Bldg Waterproof Engn & Technol Res Ctr Hubei Prov, Wuhan 430068, Peoples R China

[3] Wuhan Univ Technol, State Key Lab Silicate Mat Architecture, Wuhan 430070, Peoples R China

[4] China Construct Third Bur Green Ind Investment Co, Wuhan 430100, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 266卷

关键词：

Wet-grinding; Ultrafine fly ash; Steam curing; Compressive strength; Microstructure; DELAYED ETTRINGITE FORMATION; BLAST-FURNACE SLAG; PORE STRUCTURE; HYDRATION CHARACTERISTICS; MECHANICAL-PROPERTIES; LITHIUM SLAG; NANO-SILICA; CONCRETE; TEMPERATURE; FINENESS;

D O I：

10.1016/j.conbuildmat.2020.120894

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Utilization of high volume fly ash is generally limited in steam-cured concrete products due to the delayed strength development. In present work, ultrafine fly ash (UFA) with a median particle size of 2.3 um was prepared with wet-grinding technology. The influence of different FA fineness, UFA content (30-70%) and curing regimes on the compressive strength and microstructure of steam-cured high volume fly ash cement composites were studied. Both the early and late compressive strength of steamcured FA blended composites were enhanced by wet-milled UFA with replacement level as high as 50%, and the strength was even higher than that of pure cement group. Pore structure of steam-cured high volume FA blended composites was effectively refined by UFA. The amount of CH after steam curing was generally lower than that with standard curing. Furthermore, the main chain length and Al/Si of C-S-H gels under steam curing were improved by UFA. Compared with prolonging the curing duration, increasing the curing temperature seems more efficient for the incorporation of aluminum from fly ash into the calcium silicate hydrates. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：13

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