Effect of Spent Waterglass Foundry Sand on Performance of Alkali-Activated Slag Material Mortar

doi:10.16552/j.cnki.issn1001-1625.2025.0587

Abstract

Abstract: In this study, spent waterglass foundry sand (SwFS, denoted as SwFS₁ and SwFS₈, respectively) with two heat treatments of 100 and 800 ℃ were prepared to explore effect of SwFS on the properties of alkali-activated slag material (AASM) mortar. The results show that the solubility and content of dry waterglass coating (DWC) in SwFS determine the overall performance of AASM mortar, and both SwFS can increase the fluidity of AASM mortar. In particular, SwFS₁ with high solubility can accelerate the formation of hydration products and effectively refine the pore structure, thus significantly improving the micro-mechanical properties of AASM mortar. Due to the complexity of the interlayer interface, the compressive strength of AASM mortar increases first and then decreases with the increase of SwFS₁ content. When the SwFS₁ content is 60% (mass fraction), the compressive strength is the best, and the 3, 7 and 28 d compressive strength increases by 44.5%, 41.0% and 49.4%, respectively. Compared with SwFS₁, the solubility of SwFS₈ is lower, and enhancement effect of SwFS₈ on the compressive strength of AASM mortar is weakened. However, the hardened shell formed after DWC calcination enhances the elastic modulus of the interfacial transition zone (ITZ) in the sandwich-like interface, so that the compressive strength of AASM mortar with 100% (mass fraction) SwFS₈ is slightly higher than that of the control group, and the compressive strength increases by 9.1 % at 28 d.

Key words: spent waterglass foundry sand, alkali-activated slag material, interfacial transition zone, elastic modulus, compressive strength

CLC Number:

TQ177

SUN Fang, QIAO Maimai. Effect of Spent Waterglass Foundry Sand on Performance of Alkali-Activated Slag Material Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4425-4435.

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