排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
2.
矿渣微粉掺量对混凝土收缩开裂的影响 总被引:11,自引:0,他引:11
收缩开裂是现代混凝土劣化的重要原因.采用改进的椭圆环收缩开裂试验、自由收缩和抗折强度试验,以及不同养护条件下混凝土抗压强度对比试验来综合评价矿渣微粉掺量对混凝土收缩开裂的影响.结果表明,矿渣微粉掺量为40%~50%时,胶砂初始开裂时间明显增长,混凝土自由收缩减小,混凝土早期收缩开裂性能显著改善,混凝土抗压强度达到最高;标准养护条件比干燥养护条件对矿渣微粉混凝土强度的发展更有利. 相似文献
3.
Rheological characteristics of fiber-modified asphalt mixture were investigated.Cellulous fiber,polyester fiber and mineral fiber were used as additives for asphalt mixture,and the dosages were 0.3%,0.3%,0.4%,respectively.Dynamic modulus test using superpave simple performance tester(SPT) was adopted to study the dynamic modulus and phase angle for the control mixture and fiber-modified ones at various temperatures and frequencies.Test results show that the rheological properties can be improved significantly by the addition of various fibers.The dynamic modulus increases with the increase of frequency,and the phase angle decreases with the increase of frequency.When various fibers are used,the dynamic modulus increases and phase angle decreases at each frequency.This indicates that the stiffness and the elastic portion of fiber-modified asphalt mixtures can be enhanced when various fibers are used,which results in the change of viscoelastic properties of mixtures.The creep test results show that the total strain and the permanent strain of asphalt mixtures during load-unload cycle can be significantly reduced,which results in the improvement of resistance to permanent deformation for asphalt mixtures containing various fiber additives.The Burgers model can be employed effectively to illustrate the rheological properties of fiber modified asphalt mixtures. 相似文献
4.
5.
6.
7.
8.
Self-monitoring electrically conductive asphalt-based composite containing carbon fillers 总被引:1,自引:0,他引:1
A new novel function materials, structure self-monitoring asphalt-based composite was introduced. The results show that the output resistance of electrically conductive asphalt-based composites would change under cyclic loading and vehicle loading action. The resistance change of conductive asphalt-based composites was aroused by the variation of its interior structure. When the fatigue failure was studied, the larger cracks cut the continuous electrically conductive path and the electron is difficult to overcome the potential barrier of gap. In the early period, the slight deformation and microcrack may be recovered due to the viscoelasticity character of asphalt, which leads to some cracks close again, the output resistance changes a little. But with the shear process performs continuously, the cracks become larger and larger, which would cut the conductive path and block off the transition of electrons, and if the cracks are large enough, the pitch-matrix composites containing carbon fillers will lose electrically conductive function. When the rutting failure was studied, the flowage of conductive substance results in the decrease of substance due to electrically conducting and conductive path decreasing. The decrease of electron volume contribute to electrically conducting and large stone aggregate prevent the electron from transiting. In a word, the variation of output resistance is aroused by the variation of interior structure completely. 相似文献
9.
纤维类型对排水性沥青混合料性能的影响 总被引:2,自引:0,他引:2
通过析漏、飞散、体积性能、车辙、冻融劈裂等试验,研究了聚酯和木质素2种纤维对排水性沥青混合料性能的影响。基于摩尔.库仑定理,采用无侧限抗压和间接抗拉强度对混合料的内聚力和内摩擦角进行计算,并通过CF图像对该混合料骨架进行观测。研究结果表明:在排水性沥青混合料中,纤维主要起稳定沥青,增加沥青膜厚的作用,而对混合料的增强作用不显著。相对聚酯纤维而言,木质素纤维更适用于排水性沥青混合料。 相似文献
10.
聚酯纤维沥青混凝土动态模量与疲劳性能研究 总被引:3,自引:0,他引:3
采用动态模量试验和间接拉伸疲劳试验研究了聚酯纤维沥青混凝土(纤维掺量为0.25%)的动态模量特性和疲劳性能,分析了聚酯纤维对沥青混凝土粘弹特性和疲劳性能的影响。结果表明,聚酯纤维掺入后能降低沥青混凝土低温时的脆性,提高其高温时的劲度。同时,聚酯纤维沥青混凝土的损耗模量降低,其抵抗疲劳开裂的能力增强。间接拉伸疲劳试验也表明,聚酯纤维能提高沥青混凝土的疲劳寿命,且在低应力的情况下改善效果更加明显。 相似文献