脱盐处理对钢样-砂浆界面微观结构的影响

运用扫描电镜(SEM)和X-射线衍射(XRD)技术研究了电化学脱盐处理对钢样-砂浆界面微观结构的影响。试验结果表明,经电化学脱盐处理后,钢样-砂浆界面的微观形貌特征与组成发生了明显的变化。

Simulation of Morphologies and Mechanical Properties of A/B Polymer Blend Film

The effects of blend composition and micro-phase structure on the mechanical behavior of A/B polymer blend film are studied by coupling the Monte Carlo(MC) simulation of morphology with the lattice spring model(LSM) of micro mechanics of materials.The MC method with bond length fluctuation and cavity diffusion algorithm on cubic lattice is adopted to simulate the micro-phase structure of A/B polymer blend.The information of morphology and structure is then inputted to the LSM composed of a three-dimensional network of springs to obtain the mechanical properties of polymer blend film.Simulated results show that the mechanical response is mainly affected by the density and the composition of polymer blend film through the morphology transition.When a force is applied on the outer boundary of polymer blend film,the vicinity of the inner cavities experiences higher stresses and strains responsible for the onset of crack propagation and the premature failure of the entire system.

CaO掺量对压蒸条件下粉煤灰-石灰系统水热反应的影响

基于低温合成粉煤灰水泥现有技术,将常压养护改为压蒸养护,研究CaO掺量对压蒸条件下粉煤灰-石灰系统水热合成反应的影响,着重探索CaO掺量对所制得水泥净浆强度的影响,并借助于XRD和SEM等手段分析整个过程的物相组成及变化、微观结构和形貌特征等。结果表明:随着CaO掺量的增加,最终生成的胶凝材料中的β-C2S和C12A7的含量也相应地增加;但是当CaO掺量过高时,其胶凝材料中的β-C2S和C12A7的含量不再增加,同时其净浆强度也会有所损失。