带裂缝混凝土的吸水性能及防水处理的影响

对小尺寸钢筋混凝土梁诱导了不同宽度的裂缝,通过吸水试验研究了带裂缝混凝土的吸水性能,以及混凝土表面涂覆硅烷和内掺硅烷对水分侵入的抑制效果.结果显示,带裂缝混凝土在吸水4 h内,其吸水量与时间平方根呈良好的线性关系;混凝土吸水系数随裂缝宽度的增大而增大,且呈"S"形状;经表面防水处理的混凝土,水分以气态形式沿裂缝进入混凝土,贯穿憎水区后逐渐凝结并最终与外界建立吸水通道,防水效果取决于憎水层厚度和裂缝宽度;内掺硅烷的混凝土整体憎水,即使裂缝宽度达0.4 mm,其防水效果仍保持不变.

Water Absorption Property of Cracked Concrete and Effect of Water Repellent Treatment

A series of small size RC beams were introduced with different crack widths and then treated with silane-based water repellent on the surface and inside the concrete.Their water absorption properties were then evaluated.The results indicate that a linear function of square root of time could describe well the water absorption for cracked concrete within 4 h of the test,the coefficient of water absorption increases with the increase of crack width following an S shape.For the cracked concrete with surface wa...