Mechanical Properties and Microstructure of Ultra-High Performance Concrete Containing Glass Powder

Abstract

Abstract: Glass powder (GP) is an environmental-friendly solid waste material. A kind of green ultra-high performance concrete (UHPC) was prepared using GP in order to save resources and solve the environmental pollution problem effectively. The effect of GP as a variety of supplementary cementitious materials on the mechanical properties and microstructure of UHPC was studied. Results show that GP improves the flowability of UHPC. The incorporation of GP reduces the early age mechanical properties of UHPC, while enhances the mechanical properties of UHPC at later age. The compressive strength of UHPC sample with 20% (mass fraction) GP at 28 d is close to that of the reference group, while the compressive strength at 90 d is 13.2% higher than that of the reference group. UHPC sample (90 d) with an addition of 20% GP owns the lowest total porosity, which is 14.6% lower than that of the reference group. At the same time, the content of high-density hydrated calcium silicate gel increases by 20%, resulting in denser microstructure of UHPC. GP has a good combination of the micro-aggregate filling effect and the pozzolanic effect.

Key words: ultra-high performance concrete, glass powder, mechanical property, microstructure, flowability, porosity

CLC Number:

TU528.01

YANG Zhenying, ZHOU Changshun. Mechanical Properties and Microstructure of Ultra-High Performance Concrete Containing Glass Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 3956-3962.

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