Reusing waste glass fines to substitute cement and sand for recycled ultra-high performance strain-hardening cementitious composites (UHP-SHCC)

作者：Zhiming Ma, Zhiyu Zhang, Zhiyu Zhang, Xin Liu, Youchao Zhang, Changqing Wang · 发表于：Construction and Building Materials · 年份：2024 · DOI：10.1016/j.conbuildmat.2024.139186 · 被引用次数：16 · 研究领域：Innovative concrete reinforcement materials、Concrete and Cement Materials Research、Recycled Aggregate Concrete Performance

Using waste glass fines (WGF) as cement and silica sand replacement for recycled ultra-high performance strain-hardening cementitious composites (UHP-SHCC) provides an effective method for the high-value utilization of waste glass while reducing its carbon emissions and preparation cost. This study investigated the feasibility of preparing recycled UHP-SHCC by simultaneously substituting both cement and silica sand with WGF. WGF, abundant in amorphous components, exhibited favorable pozzolanic activity and filling effect. Substituting high-volume cement with WGF negatively impacted the hydration reaction and micro-properties of UHP-SHCC matrix, while replacing silica sand with WGF improved hydration reaction and micro-structure. Generally, substituting WGF for both silica sand and cement decreased the maximum cumulative hydration heat of UHP-SHCC. The drying shrinkage resistance of UHP-SHCC is improved with WGF replacing an appropriate dosage of cement and silica sand. The compressive and flexural strengths of UHP-SHCC declined as the high-volume replacement of cement with WGF, but improved with an increase in the proportion of silica sand substituted. Simultaneously substituting cement and silica sand with WGF can yield recycled UHP-SHCC with mechanical strengths comparable to those of reference UHP-SHCC. The ductility of UHP-SHCC exhibits a trend of first increasing and then decreasing as the proportion of cement substituted by WGF increases, while it decreases with the add...