少熟料多废渣胶结料性能的研究

少熟料多废渣胶结料主要同粉煤灰、高炉矿渣、石灰石、硅酸盐熟料、石膏和WD外加剂按一定比例混合磨细而成的一种新型胶凝材料，本文通过试验，研究了少熟料多废渣胶结料的性能。研究结果表明：少熟料多废渣胶结料的熟料掺量50％和30％时，可达到52．5R复合水泥的标准，熟料掺量40％时可达到42．5R复合水泥的标准。同时，该胶结料具有长龄期强度增进率大、抗硫酸盐侵蚀性能好、干缩性能较低等特点。     

矿渣微粉掺量对混凝土收缩开裂的影响

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.     

Rheological properties of asphalt mixtures containing various fibers

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.     

彩色混凝土路面砖生产与施工工艺研究

彩色混凝土路面砖是利用彩色HEC固化剂（C-HEC）和专用生产设备处理风化砂、碎石屑制作新型装饰路面砖。本文根据实际情况的要求，研究了彩色混凝土路面砖的生产工艺与施工工艺，为进一步应用路面砖奠定技术基础。     

新型道路稳定层胶结料试验研究

将磷渣和炉渣掺入水泥熟料中并添加一定掺量的核心元素配制新型道路稳定层胶结料。研究结果表明,在本试验条件下,当各组分比例适当时,通过核心元素的有效作用,在熟料掺量35%时可以配制出高效道路稳定层胶结料,其初凝时间较长,28d抗折和抗压强度分别可达7.1MPa和38.8MPa,同时降低了工程成本。     

矿渣粉煤灰复合胶凝体系的试验研究

本文通过优化组分设计和添加剂的使用,制备了一种高掺量矿渣粉煤灰复合胶凝体系．并研究了物料粉磨方式、石膏品种及掺量、混合材的掺量及比例对复合胶凝体系强度的影响。结果表明,复合胶凝体系强度可达复合水泥42．5R标准,水化热较低并具有良好的抗硫酸盐侵蚀和干缩性能,由其配制的混凝土具有良好的抗渗性能。     

水泥基材料电特性的研究进展

水泥基材料的电特性与材料的结构和性能密切相关．回顾了水泥基材料电特性的研究历史，介绍了国内外水泥基材料电特性的研究方法及进展，并指出了当前水泥基材料电特性研究的特点和急需解决的问题．     

Self-monitoring electrically conductive asphalt-based composite containing carbon fillers

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.     

辅助胶凝材料对水泥基材料早期开裂的影响

辅助胶凝材料是高性能水泥基材料不可缺少的组分，早期收缩开裂是导致水泥基材料劣化的根本原因。本文籍自由收缩和多通道椭圆环收缩开裂测试手段并辅以强度试验综合评价了粉煤灰、硅粉对水泥砂浆早期收缩开裂和强度的影响。结果表明，粉煤灰和硅粉复掺45％-50％时，有利于砂浆强度的发展；同时，进一步研究了粉煤灰、硅粉对砂浆自由收缩、初始开裂时间以及初始开裂时抗折强度的影响。在本试验材料体系内，优化出开裂敏感性相对较优的水泥基材料组成。     

纤维类型对排水性沥青混合料性能的影响

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。