模拟酸雨对混凝土影响的研究

采用周期浸泡和喷淋试验等２种加速腐蚀试验方法，分别研究ＰＨ为１．０、３．５、５．６和ＰＨ为１．０、ＳＯ＾２－４为０、０．０６、０．１ｍｏｌ／Ｌ等６种模拟酸雨对混凝土的影响。

Impact of Simulated Acid Rain on Concrete Structures

Two erosion-accelerating methods (periodical immersion and periodical spraying) were developed,and used to study the effects on concrete structures of simulated acid rains of different acidities and concentrations. The following conclusions were dlawn:as compared with the concrete made of portland cement,the concrete made of slag cement was more resistant to acid rainl the coordinate erosion of H⁺ and SO₄^2- reduced the strength of concrete,and the reduction was as econdary linear function of both CaO loses andthe ratio of SO₄^2-,content to CaO content; the penetration rate of H⁺ was an exponential function of time; the crystal structure and chemical composition changed in the process of erosion; substances such as CaNa]SiAl]₄O₈,and NaK]ALSt,O,were gradually replaced by more voluminoussubstances such as CaAl₂Si₂O₈ and CaSO₄·2H₂O; the contents of CaO,MgO,Al₂O₃ and Fe₂O₃ became lower,and the losing of Fe₂O₃ was caused by the erosion of H+ other than while CaO and Al₂O₃ being eroded by both H⁺ and SO₄^2-.