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Effect of incorporating nanosilica on properties of self compacting 26 architectural mortars prepared with waste glass

Author(s): Jianxin Lu and Chi Sun Poon
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
Publisher: RILEM Publications SARL
Publication year:2018
Total Pages:1
Language : English

Abstract: The aim of this study was using nanosilica (NS) to improve the early-age properties for self compacting architectural mortars prepared with glass powder (GP) and glass aggregates. The effect of NS on workability, stiffening time, setting time, early-age strength and corresponding mechanism were reported. The results showed that the flow values of cement mortar were reduced with increasing dosage of NS due to the high specific surface of the NS. The inclusion of GP delayed the setting time of the cement paste, whereas further addition of NS was conducive to shorten the setting time. Also, the addition of NS could recover the strength losses of the mortar due to the replacement of cement by GP. The hydration kinetics of the GP blended cement was significantly modified by the addition of the NS, i.e. acceleration of the second and third peaks in isothermal calorimetry. In terms of microstructure, the inclusion of NS could improve the ITZ between GP particles and the binder matrix similar to the role of SCMs in concrete. Moreover, the incorporating of NS in the system contributed to refining the coarsening pore structure induced by the incorporation of GP.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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