TEOS/异丁基三乙氧基硅烷复合乳液对带损伤水泥基材料的防护

Protection of Cement Based Materials with Damage by TEOS-Isobutyl Triethoxysilane Compound Emulsion

以异丁基三乙氧基硅烷和正硅酸四乙酯(TEOS)为主要原料,制备了TEOS/异丁基三乙氧基硅烷复合乳液(简称复合乳液),并对比研究了复合乳液、异丁基三乙氧基硅烷乳液、TEOS三种材料对水泥基材料在出现磨损(5 mm范围内)和裂缝(0.1~0.5 mm范围内)损伤后防水效果的影响。结果表明,复合乳液、异丁基三乙氧基硅烷乳液对出现损伤后的水泥基材料具有很好的防水效果,TEOS的效果较差。当再生混凝土磨损深度达到5 mm时,涂覆复合乳液的试块比未磨损试块的吸水系数分别降低了45.8%(C40)和54.6%(C50)。涂覆复合乳液后,即使水泥基材料出现0.2 mm和0.5 mm裂缝,试块的毛细吸水系数也比未涂覆时分别降低了74.8%和70.1%。

A new kind of permeable waterproof material was synthesized by tetraethoxysilane(TEOS)and isobutyl triethoxysilane as main raw materials.The effects of TEOS-isobutyl triethoxysilane compound emulsion,isobutyl triethoxysilane emulsion and TOES on water absorption properties of cement based materials with damages were comparative evaluated.The results indicate that the cement based materials treated by compound emulsion and isobutyl triethoxysilane emulsion always show excellent waterproof properties after been damaged.When the concrete wear depth reaches 5 mm,the water absorption coefficient of the test block coated with the composite emulsion is reduced by 45.8%(C40)and 54.6%(C50)respectively.When the crack width is 0.2 mm and 0.5 mm in cement based materials with compound emulsion,capillary water absorption coefficient has also decreased 74.8%and 70.1%,respectively,compared with those unprotected samples.