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Effect of Lightweight Aggregates Incorporation on the Mechanical Properties and Shrinkage Compensation of a Cement-Ground Granulated Blast Furnace Slag-Phosphogypsum Ternary System

Yu Wang1,2, Mengyang Ma1,2,*, Yong Long1,2, Qingxiang Zhao1,2, Zhifei Cheng1,2
1 State Key Laboratory of Bridge Intelligent and Green Construction, China Railway Major Bridge Engineering Group Co., Ltd., Wuhan, 430034, China
2 China Railway Bridge Science Research Institute., Ltd., Wuhan, 430034, China
* Corresponding Author: Mengyang Ma. Email: email
(This article belongs to the Special Issue: Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials)

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2024.048695

Received 15 December 2023; Accepted 22 February 2024; Published online 08 April 2024

Abstract

Shrinkage-induced cracking is a common issue in concrete structures, where the formation of cracks not only affects the aesthetic appearance of concrete but also potentially reduces its durability and strength. In this study, the effect of ceramsite sand addition on the properties of a ternary system of cement-ground granulated blast furnace slag (GGBFS)-phosphogypsum (PG) is investigated. In particular, the fluidity, rheology, hydration heat, compressive strength, autogenous shrinkage, and drying shrinkage of the considered mortar specimens are analyzed. The results indicate that an increase in PG content leads to a decrease in fluidity, higher viscosity, lower exothermic peak, and lower compressive strength. However, the shrinkage of the mortar specimens is effectively compensated. The incorporation of internal curing water from ceramsite sand improves fluidity, decreases both yield stress and viscosity, enhances the degree of hydration, and induces mortar expansion. However, the inferior mechanical properties of the ceramsite sand generally produce a decrease in the compressive strength.


Keywords

Phosphogypsum; ceramsite sand; internal curing; mechanical property; shrinkage
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