研究了在模拟酸雨侵蚀作用下,C50混凝土和掺矿渣、粉煤灰及SBR聚合物C50混凝土的力学性能变化.结果表明:在相当于75年酸阿侵蚀烈度的模拟条件下,五种配合比的C50混凝土的主要力学性能无明显劣化,仍可以达到混凝土结构设计对其力学性能的要求;矿渣、SBR聚合物和粉煤灰可以不同程度的提高混凝土后期力学性能,或降低酸雨对混凝土侵蚀程度和速率;酸雨侵蚀下混凝土表面溶蚀是主要问题,存在使对表面状态敏感的抗折、抗拉强度等力学性能下降的可能性;并从结构安全度角度考虑酸雨侵蚀对混凝土的影响.
The mechanical properties of C50 concrete as well as the C50 concretes with slag, SBR polymer and fly ash respectively were tested after exposure in an environment of simulated acid rainfall for periods of desired length. The result showed that the main mechanical properties of these five concretes didn't de-clined obviously and still met the requirements of the structure design on strength ; Slag, SBR polymer and fly ash can improve the mechanical properties of concrete and lower the erosion rate of concrete to some extent in the later stage of the exposure in the condition of simulated acid rainfall occurred in area of Fus-han city for a length of period around 75 years. The main trouble for concrete in acid rainfall is surface e-rosion. That is to say that the acid rain may induce the degradation of some mechanical properties which are sensitive to surface status such as flexural strength and tensile strength, which should be considered for designing and constructing of a reliable structure.
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