中文摘要：

以正硅酸四乙酯（TEOS）和异丁基三乙氧基硅烷乳液为主要原料，采用溶胶凝胶法制备复合型硅烷凝胶，并将其涂敷于碳化后的水泥砂浆试块表面。通过静水压力下毛细吸水实验研究了复合喇硅烷凝胶对不同碳化龄期砂浆试块防水性能的影响；通过SEM分析了复合型硅烷凝胶在砂浆试块表面的结合情况。结果表明：小同碳化龄期（7d、14d、28d）砂浆试块的毛细吸水率在涂覆复合型硅烷凝胶后分别降低了78．71％、80．83％和82．41％，碳化带来的砂浆自密实化并不影响复合型硅烷凝胶的渗透效果。SEM观察表明，在复合型硅烷凝胶涂覆区域，硅钙比明显增加，并且砂浆表面更加密实，说明复合型硅烷凝胶有效地填充往了表面的毛细孔与微裂缝中，对经过长时间碳化的水泥基材料具有良好的防水效果，并可以用下材料表面的修复和防护。

英文摘要：

A new kind of composite silane gel material has been synthesized from ethyl silicate （TEOS） and isobutyl silane as raw materials via sol-gel method, which is applied to the surface of the carbonized cement mortar block. The effects of the prepared gel on waterproof performance of the concrete substrates which have been carbonized for different time （ e.g., 7 d, 14 d and 28 d） are investigated via a capillary water absorption testing method. Furthermore, the morphology of composite gel on cement mortar block is also analyzed by scanning e- lectron microscope （SEM）. The result shows that the capillary water absorption of the carbon- ized cement mortar blocks coated with the composite gel is decreased by 78. 71% （7 d ）, 80. 83% （14 d） and 82.41% （28 d） respectively. Moreover, the self-compacting derived from carbonization does not affect the composite gel permeation efficiency. The SEM reveals that the silicon/calcium ratio in the area coated with the composite gel increases significantly, wherein the surface of mortar block was more compact. It is indicated that the composite gel can effeclively filling in the capillary pores and micro-cracks of the carbonized cement mortar blocks, which enables the cement substrate to show good waterproof performance. The compos- ite gel can be used to repair and protect on the surface of the cement substrates.