Municipal solid waste incineration generates large quantities of bottom ash that should be recycled. Current use of municipal solid waste incineration bottom ash (MSWI-BA) in cementitious materials is mostly in Ordinary Portland Cement (OPC). This paper considers using MSWI-BA as sand substitution in Calcium Sulfoaluminate Cement (CSA) as an alternative to OPC. A comparison between OPC and CSA mortars containing 0–2 mm MSWI-BA is conducted. The MSWI-BA used was treated to remove the ferrous and non-ferrous metals in order to obtain a better mineral fraction. Different percentages (0%, 25%, 50%, 75%, and 100%) of standard sand were substituted by MSWI-BA based on equivalent volume. Experimental results showed that the compressive strength and porosity of the CSA mortars were superior to OPC after substitution at 1, 7, 28, and 90 days. The compressive strength of OPC mortars with 25% substitution decreased by 40% compared to 11% for CSA mortars at 90 days. This is due to the difference in pH between the two cement pastes as OPC in contact with the MSWI-BA leads to a reaction with the aluminum content which releases hydrogen gas, increases the porosity, and decreases the compressive strength.

中文翻译：

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用硫铝酸钙水泥替代硅酸盐水泥在砂浆中回收城市生活垃圾焚烧底灰

城市生活垃圾焚烧会产生大量底灰，需要回收利用。目前在水泥材料中使用的城市固体垃圾焚烧底灰 (MSWI-BA) 主要是普通硅酸盐水泥 (OPC)。本文考虑在硫铝酸钙水泥 (CSA) 中使用 MSWI-BA 作为砂替代品来替代 OPC。对含有 0-2 毫米 MSWI-BA 的 OPC 和 CSA 砂浆进行了比较。使用的 MSWI-BA 进行了处理，以去除黑色金属和有色金属，以获得更好的矿物成分。不同比例（0%、25%、50%、75%和100%）的标准砂根据等效体积被MSWI-BA替代。实验结果表明，CSA 砂浆在 1、7、28 和 90 天置换后的抗压强度和孔隙率均优于 OPC。与 CSA 砂浆在 90 天时的 11% 相比，25% 替代率的 OPC 砂浆的抗压强度降低了 40%。这是由于两种水泥浆之间的 pH 值不同，因为 OPC 与 MSWI-BA 接触会导致与铝成分发生反应，从而释放出氢气，增加孔隙率并降低抗压强度。