To boost the mechanical strength and endurance quality of cement-based composites, basalt fiber and polypropylene fiber have been included cement-based composites in a single-doped and mixed manner, respectively. Through the tests of flexural strength, compressive strength, drying shrinkage and freeze-thaw cycle, the mechanics properties and endurance quality of cement-based composites with different fiber contents were analyzed. Scanning electron microscopy and a mercury intrusion test were used to compare and study the microstructure and pore structure properties of cement-based composites. The results indicate that the improvement of compressive strength for cement-based composites by single adding basalt, polypropylene fiber and mixed addition of two kinds of fibers is not obvious, but improving the flexural strength of composites by single addition of fiber and 1:1 mixing in a certain dosage range is effective. Among them, 1:1 mixed fiber shows a better advantage superposition effect, which shows better enhancement and toughening effect on composites. Fiber single doping and 1:1 mixing can reduce the Drying shrinkage and mass loss rate of the composites within a certain range, and enhance the composites' ability to resist Drying shrinkage and freezing. Based on the comprehensive mechanical properties and durability tests, it is recommended that the content range of the two fibers mixed with 1:1 is 0.4 %–0.6 %. Both basalt fiber and polypropylene fiber can be closely combined with the cement matrix, and randomly distributed in the composite material to form a network structure, which has the function of series skeleton, effectively inhibits the generation and expansion of cracks in the composite material, and improves the microstructure of the composite material. Both basalt fiber and polypropylene fiber can reduce the harmful pores and multi-harmful pores of the composite material, and transform them into harmless pores and less harmful pores, refine the internal pore structure of the composite material, and improve its compactness. The two kinds of fibers are randomly distributed to form a network structure, which refines the large pore size inside the composite material and blocks the connected pores, and the basalt fiber is refined to fill the interface between the polypropylene fiber and the cement matrix, so that the composite material is more compact, thereby significantly improving the mechanical properties and durability of the composite material.

中文翻译：

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玄武岩纤维和聚丙烯纤维对水泥基复合材料力学性能和耐久性能的影响

为了提高水泥基复合材料的机械强度和耐久性质量，玄武岩纤维和聚丙烯纤维分别以单掺杂和混合的方式加入到水泥基复合材料中。通过抗折强度、抗压强度、干燥收缩和冻融循环试验，分析不同纤维含量水泥基复合材料的力学性能和耐久性质量。采用扫描电子显微镜和压汞试验对水泥基复合材料的微观结构和孔结构性能进行了比较和研究。结果表明,单独添加玄武岩、聚丙烯纤维和两种纤维混合添加对水泥基复合材料抗压强度的提高不明显,但单独添加纤维和1:1混合可提高复合材料的弯曲强度在一定剂量范围内有效。其中1:1混合纤维表现出更好的优势叠加效果，对复合材料表现出更好的增强增韧效果。纤维单一掺杂和1:1混合可以在一定范围内降低复合材料的干燥收缩率和质量损失率，增强复合材料的抗干燥收缩和抗冷冻能力。根据综合力学性能和耐久性测试，建议两种纤维1:1混合的含量范围为0.4%~0.6%。玄武岩纤维和聚丙烯纤维均能与水泥基体紧密结合，并随机分布在复合材料中形成网状结构，具有串联骨架的作用，有效抑制复合材料裂纹的产生和扩展，改善复合材料的微观结构。玄武岩纤维和聚丙烯纤维均可减少复合材料的有害孔隙和多害孔隙，转化为无害孔隙和少害孔隙，细化复合材料内部孔隙结构，提高其致密性。两种纤维随机分布形成网状结构，细化了复合材料内部的大孔径并堵塞了连通的孔隙，玄武岩纤维细化填充了聚丙烯纤维与水泥基体之间的界面，因此使复合材料更加致密，从而显着提高复合材料的力学性能和耐久性。