水泥乳化沥青混凝土细观损伤及微观性能

发布时间：2018-11-22 07:23

【摘要】：为了给水泥乳化沥青混凝土研究及应用提供技术支持,基于计算机断层成像(CT)技术及扫描电镜(SEM)、X射线衍射(XRD)及热重(TG)等测试手段,对水泥乳化沥青混凝土的细观损伤规律及微观性能进行了试验研究.结果表明:连续加载过程中,水泥乳化沥青混凝土试件上部分断面的CT平均数变化较小,下部分变化较大、损伤严重.试件的破坏过程分为压密、扩容、裂纹扩展及破坏4个阶段,损伤过程表现出塑性特征,这源于水泥乳化沥青混凝土低强度、低弹模的力学性能.乳化沥青与黏土不参与水泥水化,破乳后的沥青包裹水泥颗粒,减缓了水泥早期水化速度;后期水化迅速,结构逐渐致密,部分沥青与Ca(OH)_2,C_3S,C_2S及钙矾石等水化产物相互镶嵌.
[Abstract]:In order to provide technical support for the research and application of cement emulsified asphalt concrete, based on computer tomography (CT), scanning electron microscope (SEM) (SEM), X ray diffraction (XRD) and thermogravimetric (TG) (TGA), etc. The micro-damage law and micro-performance of cement-emulsified asphalt concrete were studied. The results show that during the continuous loading process, the average CT of some sections of cement emulsified asphalt concrete specimens varies slightly, while the lower part changes greatly, and the damage is serious. The failure process of the specimens is divided into four stages: compaction, expansion, crack propagation and failure. The damage process shows plastic characteristics, which is due to the mechanical properties of low strength and low elastic modulus of cement emulsified asphalt concrete. Emulsified asphalt and clay do not participate in the hydration of cement, and the asphalt encapsulates the cement particles after demulsification, which slows down the early hydration rate of cement. In the later period, the hydration was rapid and the structure became denser. Some of the hydration products such as Ca (OH) _ 2C _ 2C _ S C _ S and ettringite were inlaid into each other.
【作者单位】：长江科学院水利部水工程安全与病害防治工程技术研究中心;
【基金】：“十二五”国家科技支撑计划项目(2011BAE27B00) 国家自然科学基金资助项目(51139001,51109015) 中央级公益性科研院所基本科研业务费资助项目(CKSF2011018/CL)
【分类号】：TU528

【参考文献】