Effect of pre-wetting treatment for waste waterglass foundry sand on the properties of alkali-activated slag

X. Shen; P. Chen; S. Li; Y. Wang; S. Hu; C. Pei; J. Xie

doi:10.3989/mc.2024.371123

Authors

X. Shen School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0009-0007-4897-943X
P. Chen School of Civil Engineering and Architecture, Anhui University of Science and Technology - State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology https://orcid.org/0000-0002-5538-617X
S. Li School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0002-7103-5011
Y. Wang School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0003-4992-7205
S. Hu School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0009-0003-3189-6882
C. Pei School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0009-0002-5145-6174
J. Xie School of Civil Engineering and Architecture, Anhui University of Science and Technology https://orcid.org/0000-0002-0364-8406

DOI:

https://doi.org/10.3989/mc.2024.371123

Keywords:

Alkali-activated slag materials, Waste waterglass foundry sand, Interface, Compressive strength, Nanoindentation

Abstract

Waste waterglass foundry sand (WwFS) is a solid waste generated by the foundry industries that is commonly discarded in landfills and has urgent needs for disposal and recycling. Accordingly, this study suggests using WwFS as aggregates source for the preparation of alkali-activated slag mortars (AASM). Two different pre-wetting methods (24 h pre-wetting at 20°C and 1~6 h pre-wetting at 70°C) were used to treat WwFS and compared their performances with adding quartz sand and dried WwFS mortars. Compared to WwFS mortars without pre-wetting treatment, the compressive strengths of WwFS mortars containing WwFS pre-wetting in water at 70°C at 28d were increased by 1.3~10.0%, and the C-(A)-S-H average elastic modulus was increased by 16%. This study confirmed the feasibility of using hot water pre-wetted WwFS as the single aggregate source for AASM, which is important for the large-scale utilization of WwFS.

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