不同措施对水泥稳定碎石混合料性能的影响

通过开展抗压回弹模量测试、强度测试、收缩性能测试和耐久性能测试,研究了采用振动拌和技术、掺加玄武岩纤维、掺加膨胀剂以及提高水泥用量四种措施对水泥稳定碎石混合料性能的提升效果,并基于多因素方差分析评价了不同技术措施对水泥稳定碎石混合料各项性能的影响程度。结果表明,这四种措施对水泥稳定碎石混合料性能具有显著影响,增大水泥用量对其强度、抗压回弹模量和耐久性提升效果最为显著,但对抗收缩开裂性能不利。掺加膨胀剂和玄武岩纤维可以显著改善水泥稳定碎石混合料的干缩性能,与31 d龄期的基准水泥稳定碎石混合料相比,干缩系数分别降低57.7%和18.8%。

Effects of Different Measures on Performance of Cement Stabilized Macadam Mixture

Through compressive rebound modulus tests, strength tests, shrinkage tests and durability tests, the improvement effects of four different measures, including vibration mixing technology, adding basalt fiber, adding expansion agent and increasing the amount of cement, on the performance of cement stabilized macadam mixture were studied. The effect degrees of different technical measures on the properties of cement stabilized macadam mixture were evaluated based on multivariate analysis of variance. The results show that these four measures have significant impact on the performance of cement stabilized macadam mixture. Increasing the amount of cement has the most significant effect on the improvement of its strength, compressive rebound modulus and durability, but the anti-shrinkage cracking performance is unfavorable. The addition of expansive agent and basalt fiber significantly improve the dry shrinkage performance of cement stabilized macadam mixture, and compared with the benchmark cement stabilized macadam mixture at the age of 31 d, the dry shrinkage coefficient is reduced by 57.7% and 18.8%, respectively.