掺废陶瓷粉对碱激发矿渣早期反应、硬化体强度及收缩性能的影响

doi:10.11896/cldb.22030249

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Abstract Alkali activated slag cement (AAS) has the characteristics of rapid strength development and good binding property, however, its large shrinkage and high cost hinder the industrial application. To explore the feasibility of using waste ceramic powder as new raw materials, this study investigated the effects of its blending amount on the early reaction, compressive strength of hardened products, shrinkage and microstructure properties. Results show that the incorporation of ceramic powder can delay the setting time of paste due to its lower reactivity than slag. Alkali activated 100% ceramic powder cannot set and harden at room temperature as normal cement does. The compressive strengths of AAS pastes with 10%—50% ceramic powder develop slowly before 7 d, but increase progressively and become comparable to alkali activated 100% slag at 90 d. However, strengths of AAS pastes and mortars both decrease significantly when more than 50% ceramic powder is used. As expected, blending ceramic powder can effectively reduce autogenous shrinkage of AAS mortar but will increase drying shrinkage, while blending a small amount (less than 20%) has little negative effect on drying shrinkage though. Given the comprehensive properties of the tested pastes and mortars, waste ceramic powder can be regarded as valuable raw materials.

Key words： alkali activated cement waste ceramic powder slag compressive strength shrinkage property

Published: 10 September 2023 Online: 2023-09-05

CLC number:

TQ172.4

Fund:National Natural Science Foundation of China (U2001225,51878263).

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	CHEN Ruqi
	ZHANG Zuhua
	SHI Caijun

Cite this article:

CHEN Ruqi,ZHANG Zuhua,SHI Caijun. Effects of Blending Waste Ceramic Powder in Alkali Activated Slag on Early Reaction, Strength of Hardened Products and Shrinkage Property[J]. Materials Reports, 2023, 37(17): 22030249-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22030249 OR http://www.mater-rep.com/EN/Y2023/V37/I17/22030249

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