A series of tests were carried out to evaluate crack resistance and mechanical properties of polyvinyl alcohol fiber-reinforced cement-stabilized macadam, which is widely used as pavement base or subbase composite material. Three series of cement-stabilized macadam mixtures with cement content of 3.2%, 3.6%, and 4.0% were prepared by incorporating four various contents (0, 0.6, 0.9, and 1.2 kg/m³) and lengths (12, 18, 24, and 30 mm) of polyvinyl alcohol fiber. The optimum polyvinyl alcohol fiber content, fiber length, and cement content were determined based on the mechanical properties of cement-stabilized macadam mixtures. Then, unconfined compressive strength test, compressive resilience modulus test, splitting strength test, flexural tensile strength test, drying shrinkage test, and temperature shrinkage test were carried out in this study. The results show that polyvinyl alcohol fiber-reinforced cement-stabilized prepared by optimum proportions (cement 3.6%, fiber content 0.9 kg/m³, and fiber length 24 mm) has good crack resistance. The incorporation of polyvinyl alcohol fiber can effectively improve compressive strength and splitting strength, while its effect on CRM of cement-stabilized macadam is not remarkable. The anti-dry-shrinkage property and anti-temperature-shrinkage property of the specimens are also drastically improved due to the reinforcement effect of polyvinyl alcohol fiber. Moreover, the crack resistance index is proposed to evaluate the crack resistance of materials. The crack resistance of PVA fiber-reinforced cement-stabilized macadam prepared by optimum proportions is improved by 44.4%. Consequently, the mechanical properties and crack resistance of cement-stabilized macadam are obviously improved by adding polyvinyl alcohol fiber.

中文翻译：

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聚乙烯醇纤维增强水泥稳定碎石基的抗裂性和力学性能

进行了一系列测试，以评估聚乙烯醇纤维增强水泥稳定碎石的抗裂性和力学性能，该碎石广泛用作路面基础或路基复合材料。通过掺入四种不同的含量（0、0.6、0.9和1.2 kg / m ^3），制备出水泥含量分别为3.2％，3.6％和4.0％的三组水泥稳定的碎石混合物。）和聚乙烯醇纤维的长度（12、18、24和30毫米）。最佳聚乙烯醇纤维含量，纤维长度和水泥含量是根据水泥稳定的碎石混合物的机械性能确定的。然后，进行了无侧限抗压强度试验，抗压弹性模量试验，劈裂强度试验，挠曲拉伸强度试验，干燥收缩试验和温度收缩试验。结果表明，以最佳比例（水泥3.6％，纤维含量0.9 kg / m ^3）制备了聚乙烯醇纤维增强水泥稳定剂。，并且纤维长度为24 mm）具有良好的抗裂性。聚乙烯醇纤维的掺入可以有效提高抗压强度和劈裂强度，但对水泥稳定碎石的CRM效果不明显。由于聚乙烯醇纤维的增强作用，样品的抗干缩性和抗温缩性也大大提高。此外，提出了抗裂指数来评价材料的抗裂性。以最佳比例制备的PVA纤维增强水泥稳定碎石的抗裂性提高了44.4％。因此，加入聚乙烯醇纤维可明显改善水泥稳定碎石的机械性能和抗裂性。