【作者】 韩鹏举； 白晓红； 贺武斌； 王梅；

【Author】 HAN Peng-ju BAI Xiao-hong HE Wu-bin WANG Mei (College of Architecture and Civil Engineering,Taiyuan Univ of Technology,Taiyuan,Shanxi 030024)

【机构】 太原理工大学建筑与土木工程学院；

【摘要】 通过模拟试验的方法探讨了在不同硫酸溶液和硫酸镁溶液环境下不同龄期的水泥土表观和抗压强度变化规律和pH值、Mg²⁺浓度和SO₄^2-浓度随时间的变化关系,得出了两种腐蚀环境下水泥土表面腐蚀程度均随着腐蚀时间的增长和溶液浓度的增大而增加,水泥土抗压强度均随溶液浓度的增大而减小;揭示了腐蚀环境介质对水泥土腐蚀的化学作用机理,最后得出硫酸溶液环境下水泥土强度的改变与溶液中的PH值和SO₄^2-浓度密切相关,硫酸镁溶液环境下水泥土强度的改变与Mg²⁺浓度和SO₄^2-浓度密切相关,并且得出SO₄^2-相同条件下,阳离子为H⁺的硫酸比阳离子为Mg²⁺的硫酸镁对水泥土侵蚀严重.更多还原

【Abstract】 In turn to cause some serious damage to the structure.In order to simulate and study the erosion effect process such as the changes of corrosive degree of surface,unconfined compression strength of cemented soil sample and the Ph values,Mg²⁺ concentration and SO₄^2- concentration of corrosive solutions,a series of tests are conducted on the cemented soil blocks which were cured in different concentrations of H₂SO₄ and MgSO₄ so- lutions including taking photos,unconfined compressive strength tests,measuring Ph value,Mg²⁺ concentration and SO₄^<sup>2- concentration.The results of tests show that the corrosive degree of samples’ surfaces is increasing and the unconfined compression strength is decreasing with the increase of corrosive solution concentration at the same erosion time,and the corrosive degree is increasing with the corrosive time in both H₂SO₄ solution and MgSO₄ solution.At the same time,after analyzing chemical effect mechanism of contents of corrosive environ- ment on cemented soil and studying the relationships between the pH values and concentration of SO₄^2- of H₂SO₄ solution,the concentration of Mg²⁺ and SO₄^2- of MgSO₄ solution,and corrosive time,it is concluded that com- pressive strength is closely rated with the Ph values and SO₄^2- concentration of H₂SO₄ corrosive environment, and with the Mg²⁺ concentration and SO₄^2- concentration of MgSO₄ corrosive environment respectively,and H+ corrosive effect effecting is obviously stronger than Mg²⁺ in the same SO₄^2- concentration.更多还原