Effect of Glass Powder on Mechanical Properties of Recycled Concrete

Abstract

Abstract: In order to realize the recycling of waste glass, a kind of solid waste in the urban area, this paper studied the mechanical properties such as compressive strength, splitting tensile strength and elastic modulus of recycled concrete with different content (0%, 5%, 10% and 20%, mass fraction) of glass powder (GP) in cement. The internal microstructure of recycled concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that glass powder reduces the mechanical properties of recycled concrete in the early stage, but the addition of an appropriate amount of glass powder is beneficial to improve the mechanical properties of recycled concrete in the later stage. The compressive strength, splitting tensile strength and elastic modulus of the sample containing 10% (mass fraction) glass powder at 90 d are higher than that of ordinary recycled concrete, and the total porosity reduceds by 19.3%. The secondary pozzolanic activity of glass powder and the filling effect of micro-aggregates improve the microstructure of recycled concrete.

Key words: glass powder, recycled concrete, compressive strength, splitting tensile strength, elastic modulus

CLC Number:

TU528.01

YANG Zhenying, ZHOU Changshun. Effect of Glass Powder on Mechanical Properties of Recycled Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3874-3880.

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