Influence of CaO Content on the Fly Ash–Lime System Hydrothermal Synthesis Reaction Under Autoclave Curing

Chenhui Zhu; Yilong Lou; Xuemei Shen; Hesi Xu; Jie Yang

doi:10.3389/fphy.2021.782309

Frontiers in Physics (Nov 2021)

Influence of CaO Content on the Fly Ash–Lime System Hydrothermal Synthesis Reaction Under Autoclave Curing

Chenhui Zhu,
Yilong Lou,
Xuemei Shen,
Hesi Xu,
Jie Yang

Affiliations

Chenhui Zhu: School of Transportation and Civil Engineering, Nantong University, Nantong, China
Yilong Lou: Quzhou Water Resources and Soil and Water Conservation Management Center, Quzhou, China
Xuemei Shen: Water Project Management of Nantong-Lvsi Canal, Nantong, China
Hesi Xu: School of Transportation and Civil Engineering, Nantong University, Nantong, China
Jie Yang: School of Transportation and Civil Engineering, Nantong University, Nantong, China

DOI: https://doi.org/10.3389/fphy.2021.782309
Journal volume & issue: Vol. 9

Abstract

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As a substitute for traditional Portland cement, the development and research of “low-temperature-synthesized fly ash cement” has been receiving extensive attention. This study explores the effects of calcium oxide content on the fly ash–lime system hydrothermal synthesis reaction under autoclave curing, focusing on the effects of CaO content on the strength of the cement paste. The changes in phase composition, microstructure, and morphology were characterized using X-ray diffraction and scanning electron microscopy (SEM) analysis. The results show that with an increase in the CaO content, the amounts of β-C2S and C12A7 in the gelling material also increase. However, when the CaO content is very high, the amounts of β-C2S and C12A7 in the gelling material no longer increase, and the strength is lost.

Published in Frontiers in Physics

ISSN: 2296-424X (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science: Physics
Website: https://www.frontiersin.org/journals/physics

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