Open Access

ARTICLE

Effect of Mitigating Strength Retrogradation of Alkali Accelerator by the Synergism of Sodium Sulfate and Waste Glass Powder

Yongdong Xu, Tingshu He^*

College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

* Corresponding Author: Tingshu He. Email:

(This article belongs to this Special Issue: Renewable Material from Agricultural Waste and By-Product and Its Applications)

Journal of Renewable Materials 2021, 9(11), 1991-1999. https://doi.org/10.32604/jrm.2021.015931

Received 24 January 2021; Accepted 26 March 2021; Issue published 04 June 2021

Abstract

This work aims to utilize waste glass powder (WGP) as a plementary material to mitigate the strength shrinkage caused by the alkaline accelerator. Waste glass power was used to replace cement by 0%, 10%, and 20% to evaluate waste glass powder on the alkaline accelerator’s strength retrogradation. The results show that the strength improvement effect of unitary glass powder is inconspicuous. Innovative methods have been proposed to use sodium sulfate and waste glass powder synergism, using the activity of amorphous silica in glass powder. Compared with the reference group, the compressive strength of 28d mortar increases by 67% when the sodium sulfate content is 2.5%, and the replacement amount of waste glass powder is 10%. Besides, XRD and SEM analysis of hydration products also confirmed that the synergistic effect of sodium sulfate and waste glass powder could reduce strength inversion. The findings presented in this paper are pivotal for using waste glass to solve the problem of strength inversion caused by the alkaline accelerator.

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