磷石膏–矿渣–粉煤灰基碱激发胶凝材料性能研究

Study on the Properties of Alkali-Activated Cementitious Materials Based on Phosphogypsum, Slag, and Fly Ash

摘要: 以磷石膏、粉煤灰、矿渣等工业废渣为主要原料制备碱激发胶凝材料，通过三因素三水平正交试验，以磷矿比、磷粉比、NaOH含量为变量，测试其7 d、14 d、28 d抗压强度及标准稠度用水量、凝结时间，结合极差与方差分析开展研究。结果表明：对7 d、14 d早期强度的影响，按主次顺序依次为NaOH含量、磷粉比、磷矿比，磷粉比是28 d强度的主要影响因素。最优配比为：磷矿比为0.9、磷粉比为2、NaOH含量3%，不同龄期抗压强度分别为26.7 MPa、32.8 MPa、29.6 MPa；多数样品标准稠度用水量符合规范；磷矿比是凝结时间的关键调控因素，其增大可显著缩短凝结时间，如磷矿比0.9时，初凝时间最短仅95 min，终凝时间最短为241 min。

Abstract: The alkali-excited cementitious materials were prepared by phosphogypsum, fly ash, slag and other industrial waste residues, and their compressive strength, standard consistency, water consumption and condensation time were tested at 7 d, 14 and 28 days with phosphate rock ratio, phosphorus powder ratio and NaOH content as variables, and the study was carried out by combination of range difference and analysis of variance. The results showed that the NaOH content, phosphorus powder ratio and phosphate rock ratio dominated the early strength at 7 days and 14 days, and the phosphorus-powder ratio was the main influencing factor at 28 days, and the optimal ratio was 0.9, 2, and NaOH at 3%, and the compressive strength at different ages was 26.7 MPa, 32.8 MPa and 29.6 MPa, respectively. Most samples have standard consistency water consumption. The phosphate rock ratio is the key regulator of the condensation time, and its increase can significantly shorten the condensation time, such as when the phosphate rock ratio is 0.9, the minimum initial setting time is only 95 minutes, and the shortest final setting time is 241 minutes.