In some special applications at low temperature, high ductility, deformation, and durability are required for cement-based composites. Magnesium phosphate cement (MPC) possesses unique properties, including fast hardening at a temperature below 0 °C, high early-strength, and durability. This study investigated the influence of the water-to-binder (W/B) ratio, sand-to-binder (S/B) ratio, and various proportions of fly ash (FA) (as a substitute for MPC) on the workability, compressive strength, and tensile properties of high-ductility MPC-based composites (HDMPCC) incorporating polyvinyl acetate (PVA) fibre and cured at low temperatures. The experimental results revealed that the incorporation of up to 30% FA by mass significantly improved the ductility of the HDMPCC. For an S/B ratio of 0.2, strain corresponding to ultimate tensile stress was found to be more than 1.5%, resulting in better strain-hardening behaviour. Moreover, the HDMPCC composite with 30% FA, W/B ratio of 0.14, and S/B ratio of 0.12 exhibited the highest strain corresponding to peak tensile stress at 0 °C. The strain corresponding to peak and ultimate tensile stress ranged from 0.41% to 2.22%. The highest ultimate tensile stress of about 1.28 MPa was observed for HDMPCC specimens cured at 0 °C, –5 °C and –10 °C.

在低温下的一些特殊应用中，水泥基复合材料需要高延展性、变形性和耐久性。磷酸镁水泥 (MPC) 具有独特的性能，包括在 0 °C 以下的温度下快速硬化、高早期强度和耐用性。本研究调查了水与粘合剂 (W/B) 比、砂与粘合剂 (S/B) 比以及不同比例的粉煤灰 (FA)（作为 MPC 的替代品）对和易性的影响结合聚醋酸乙烯酯 (PVA) 纤维并在低温下固化的高延展性 MPC 基复合材料 (HDMPCC) 的压缩强度和拉伸性能。实验结果表明，按质量计掺入高达 30% 的 FA 显着提高了 HDMPCC 的延展性。对于 0.2 的 S/B 比，发现对应于极限拉伸应力的应变大于 1.5%，导致更好的应变硬化行为。此外，含 30% FA、W/B 比为 0.14 和 S/B 比为 0.12 的 HDMPCC 复合材料在 0°C 时表现出对应于峰值拉伸应力的最高应变。对应于峰值和极限拉伸应力的应变范围为 0.41% 至 2.22%。对于在 0 °C、–5 °C 和–10 °C 下固化的 HDMPCC 试样，观察到的最高极限拉伸应力约为 1.28 MPa。