关键词: 高强砂浆;水胶比;自收缩;干燥收缩;化学收缩

Abstract: The monolithic macroporous SiO 2with three-dimensional(3D)interconnected channel structure constructed by SiO 2nano-film was prepared by pillared monolithic macroporous polymer as template.Then, the various regular shaped monolithic Silicalite-1 @ SiO2was prepared under hydrothermal condition by immersing the macroporous SiO 2in the Silicalite-1 precursor solution.All materials were characterized by SEM,XRD,MIP(mercury intrusion porosimetry)and BET.The results show that the macropore size of Silicalite-1@SiO2is 0.5-1 μm,and the Silicalite-1 nanoparticles with a diameter between 100 and 200 nm are in situ grown on the wall of the macroporous SiO 2.Silicalite-1 nanoparticles are combined with the wall of macroporous SiO 2through chemical bonds.Silicalite-1@SiO2 shows highest crystallinity when the hydrothermal crystallization time is 10 h and the Silicalite-1@SiO2 sample maintains the structure stability of macroporous SiO 2.Compared with monolithic macroporous SiO2,the specific surface area(352 m2/g)and micropore volume(0.088 cm3/g)of Silicalite-1@SiO2 are significantly increased.Meanwhile,Silicalite-1@SiO2exhibits excellent phenol adsorption property.

Key words: high strength mortar;water/binder ratio;autogenous shrinkage;drying shrinkage;chemical shrinkage