纤维沥青混凝土蠕变性能试验研究
2018-09-10陈丽芳张森黄春水
陈丽芳 张森 黄春水



摘 要:通过不同纤维体积率和长径比的纤维沥青混凝土的弯曲蠕变试验,研究纤维体积率和长径比对混凝土蠕变变形、蠕变速率、蠕变柔量和卸载瞬时回弹模量的影响,建立了纤维沥青混凝土蠕变速率、蠕变柔量和卸载瞬时回弹模量的计算模型。试验研究和理论分析表明:纤维含量特征参数能综合反映纤维体积率和长径比对沥青混凝土蠕变速率、蠕变柔量和卸载瞬时回弹模量的影响。在本文试验范围内,纤维沥青混凝土最佳纤维体积率为0.35%,长径比为324,纤维含量特征参数为1.13。
关键词:纤维沥青混凝土;黏弹性能;蠕变试验;纤维含量特征参数
中图分类号:U416.217 文献标识码:A 文章编号:1003-5168(2018)08-0102-06
Experiment Research on the Creep Performance of Fiber
Reinforced Asphalt Concrete
CHEN Lifang1 ZHANG Sen2 HUANG Chunshui1
(1. College of Civil Engineering, Xuchang University,Xuchang Henan 461000;2. Henan Province Highway Engineering Bureau Group Co. , Ltd.,Zhengzhou Henan 450052)
Abstract: Based on the flexural creep test of fiber asphalt concrete with different fiber volume fractions and aspect ratios, the influence of fiber volume fraction and aspect ratio on the creep deformation, creep rate, creep compliance and unloading momentary modulus of resilience of asphalt concrete was studied, calculation models for the creep rate, creep compliance and unloading momentary modulus of resilience were established. The experimental study and theoretical analysis show that, the fiber content characteristic parameter can reflect comprehensively the influence of the fiber volume ratio and fiber aspect ratio on the creep rate, creep compliance and unloading momentary modulus of resilience of asphalt concrete; within the scope of the test in this article, the optimum fiber volume ratio, fiber aspect ratio and fiber content characteristic parameter are 0.35%, 324 and 1.13 respectively.
Keywords: fiber reinforced asphalt concrete;viscoelastic performance;creep test; fiber content characteristic parameter
沥青混凝土是一种典型的黏弹性复合材料。目前,主要以单轴压缩蠕变、三轴压缩蠕变和小梁弯曲蠕变等试验为基础[1-3],以阻尼器和弹簧等黏弹性基本元件组合出不同的黏弹性力学模型[4-7],研究温度、加载应力水平等对沥青混凝土黏弹性能的影响[8-10]。由于纤维的加入能显著改善沥青混凝土的路用性能,因此對纤维沥青混凝土黏弹性能的研究得到了越来越多的重视[11]。例如,Benedito[12]通过动态和静态三轴试验研究了纤维掺量和长度对冷拌沥青混凝土力学性能的影响;郭乃胜[13,14]通过聚酯纤维沥青混凝土的压缩蠕变试验,运用Burgers模型和修正的Burgers模型,研究了一种纤维长度在不同掺量下对沥青混凝土蠕变加载阶段粘弹性能的影响,建立了考虑纤维掺量影响的纤维沥青混凝土粘弹性力学模型;……
