研究了不同长度及掺量的聚丙烯纤维对碱矿渣水泥砂浆性能的影响。结果表明：6mm 和12mm 聚丙烯纤维掺量为0.04%~0.16%时，能提高碱矿渣水泥砂浆的流动度，改善碱矿渣砂浆的工作性，但随着纤维掺量的增加，流动度增加幅度减小。掺入6mm 聚丙烯纤维0.12%时，砂浆的早、后期抗压强度都有所降低，但28d 抗折强度提高25.5%，折压比提高33.3%；当掺入12mm 聚丙烯纤维0.12%时，28d 抗压、抗折强度分别增加11.8%和30.6%，且28d折压比提高25%。相比而言，在同等掺量时，掺入12mm 的聚丙烯纤维对碱矿渣水泥砂浆抗压、抗折强度的贡献优于掺入6mm 的聚丙烯纤维。%The effects of polypropylene fiber under different length and different admixture content on the properties of alkali-activated slag cement mortar are studied. The results show that when the polypropylene fiber contents with 6mm and 12mm length are 0.04%~0.16%, workability of alkali-activated slag cement mortar is improved, but with the increas-ing of fiber content, the fluidity increasing extent decreases. When the content of the polypropylene fibers with 6mm length is 0.12%, the compressive strengths of the mortar at the earlier and later stages decrease, but their 28d flexural strengths increase by 25.5% and the ratio of flexural and compressive strength increase by 33.3% as well. When the con-tent of the polypropylene fiber with 12mm length is 0.12%, the 28d compressive strength and flexural strength increase by 11.8% and 30.6% respectively and its 28d ratio of flexural and compressive strength also increases by 25%. By compari-son, under the same admixture content, the polypropylene fibers with 12mm length have a bigger contribution to the com-pressive strength and the flexural strength of the alkali-activated cement slag mortar than those of polypropylene fibers with 6mm length.
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