Effects of Blending Waste Ceramic Powder in Alkali Activated Slag on Early Reaction, Strength of Hardened Products and Shrinkage Property
CHEN Ruqi1,2,3, ZHANG Zuhua1,2,3,4,*, SHI Caijun1,2,3
1 Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China 2 International Innovation Center for Green & Advanced Civil Engineering Materials of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China 3 Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, Changsha 410082, China 4 Key Laboratory of Advanced Building Materials of the Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
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.
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2023, Vol. 37 
