基于响应曲面法的废胶粉-玄武岩纤维复合改性水泥稳定碎石性能研究

Study on the Performance of Waste Rubber Powder-basalt Fiber Composite Modified Cement Stabilized Macadam Based on Response Surface Methodology

摘要:

为了提高水泥稳定碎石的干缩性能和力学性能，采用玄武岩纤维和废胶粉对其进行复合改性。基于响应曲面法中的Box-Behnken模块进行了3因素3水平的正交实验，研究胶粉掺量、玄武岩纤维长度及掺量对7 d抗压强度、7 d弯拉强度和28 d干缩系数的影响。结果表明：玄武岩纤维能显著提升水泥稳定碎石的抗压和弯拉强度，对干缩性能也有一定改善；胶粉则主要改善干缩性能，但对力学性能有减弱作用。综合性能最优时的配比为：8.58‰玄武岩纤维+12 mm玄武岩纤维+4.48%胶粉，且性能优于普通水泥稳定碎石。

Abstract:

To enhance the dry shrinkage resistance and mechanical properties of cement-stabilized macadam, a composite modification approach was employed utilizing basalt fibers and waste rubber powder. A three-factor, three-level orthogonal experiment was conducted based on the Box-Behnken module within the response surface methodology, investigating the effects of rubber powder content, basalt fiber length, and basalt fiber content on 7-day compressive strength, 7-day flexural tensile strength, and the 28-day dry shrinkage coefficient. The results indicated that the incorporation of basalt fibers significantly elevated both the compressive and flexural tensile strengths of the cement-stabilized macadam, while also exhibiting a moderate improvement in dry shrinkage behavior. Conversely, the addition of rubber powder primarily targeted the enhancement of dry shrinkage performance but had a weakening effect on the mechanical properties. The optimal blend ratio for comprehensive performance was determined to be 8.58‰ basalt fiber content with 12 mm basalt fibers, complemented by 4.48% rubber powder, achieving performance superior to that of conventional cement-stabilized macadam.