孔结构是影响砂浆或混凝土性能的重要参数.通过压汞法研究了橡胶颗粒对砂浆孔隙率及孔径分布的影响规律,分析了橡胶颗粒对砂浆孔结构的影响机理.结果表明,随橡胶颗粒含量增加,橡胶砂浆最可几孔径增加,总孔隙率增加,其中大孔(D>1000 nm)含量增加最为明显,而凝胶孔(D<10 nm)含量变化不大.橡胶表面与水的接触角为99.5.,说明其具有憎水性,同时由于橡胶颗粒表面存在着大量凹坑,水在毛细管作用下无法充满橡胶颗粒表面凹坑,导致橡胶颗粒与水泥基体界面处存在大量孔径较大的孔隙.%Pore structure is an important factor for performance of rubber cement mortar and concrete.The pore structure and pore size distributions of rubber mortars with different amount of rubber granules addition was examined using mercury porosimetry,and the influence mechanism of rubber granules on pore structure of mortar was analyzed.The increasement of rubber granules addition results in the increasement of mode pore diameter and the total porosity,particularly for the amount of macropore(D〉1000 nm).Nevertheless,the amount of gel pore(D<10 nm)is proximally the same as that of specimen with no rubber addition.The examined contact angle of water against rubber is 99.5°,which suggests the hydrophobic nature of rubber surface.Due to rubber granules' hydrophobic surface and rough surface morphology,the water in mortar can not fill the dent in rubber surface,which illustrates the formation of the pore structure of transition zone between rubber and cement matrix.
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