低热水泥混凝土抗硫酸盐侵蚀试验研究  

Experimental Study on Sulfate Attack Resistance of Low-Heat Cement Concrete

作　　者：刘志成 钟志彬 刘宏[4] 崔凯 吕蕾[5] 周其健 LIU Zhicheng;ZHONG Zhibin;LIU Hong;CUI Kai;LYU Lei;ZHOU Qijian(School of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;Chengdu Construction Engineering Third Construction Co.,Ltd.,Chengdu 610056,China;School of Civil Engineering,Southwest Jiaotong University,Chendu 610031,China;Chengdu Construction Engineering Group Co.,Ltd.,Chengdu 610014,China;Chengdu Construction Engineering Road and Bridge Construction Co.,Ltd.,Chengdu 610073,China;China Southwest Geotechnical Investigation and Design Institute Co.,Ltd.,Chengdu 610093,China)

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]成都建工第三建筑工程有限公司,成都610056 [3]西南交通大学土木工程学院,成都610031 [4]成都建工集团有限公司,成都610014 [5]成都建工路桥建设有限公司,成都610073 [6]中国建筑西南勘察设计研究院有限公司,成都610093

出　　处：《铁道勘察》2025年第2期59-65,共7页Railway Investigation and Surveying

基　　金：国家自然科学基金项目(42293353,42293350);四川省自然科学基金项目(2022NSFSC0403)。

摘　　要：为了研究混凝土结构在不同浓度硫酸盐长期侵蚀环境下的性能劣化特征,依托某铁路路基工程低热混凝土试块,采用全浸泡法,开展混凝土在不同浓度硫酸盐(2%、5%、10%、15%)溶液、不同时长(30 d、60 d、120 d、180 d、240 d)下的抗侵蚀性能试验,分析试块侵蚀后质量变化特征及力学性能演化规律。研究结果表明,硫酸盐浓度越高,侵蚀时间越长,混凝土结构损伤劣化程度越大;侵蚀超过120 d后试块物理力学性能显著降低;受盐结晶与侵蚀作用转化,试块质量及抗压强度均呈先增大后减小的变化趋势,120 d抗压强度相较于30 d最高提升29.4%,并随侵蚀时间延长,抗压耐蚀性能整体下降,耐蚀系数最低降至0.92。由此可见,低热水泥混凝土在长时间硫酸盐侵蚀作用下耐久性能降低,研究成果可为腐蚀环境中混凝土结构耐久性评价提供重要参考依据。To investigate the performance degradation characteristics of concrete structures under long-term sulfate erosion environments with varying concentrations,this study conducted anti-erosion performance tests on low-heat concrete specimens from a railway subgrade project using the full immersion method.Specimens were immersed in sulfate solutions with different concentrations(2%,5%,10%,15%)for varying durations(30 d,60 d,120 d,180 d,240 d).Post-erosion mass variation characteristics and mechanical property evolution patterns were systematically analyzed.Key findings reveal that:higher sulfate concentrations and prolonged erosion durations exacerbated structural damage and degradation.Physicalmechanical properties of specimens exhibited significant deterioration after 120 days of erosion.Due to the transition between salt crystallization and erosion mechanisms,both mass and compressive strength initially increased and then decreased.Compared to 30-day results,the 120-day compressive strength showed a maximum increase of 29.4%,while the corrosion resistance coefficient gradually declined with prolonged exposure,reaching a minimum of 0.92.The results demonstrate that low-heat cement concrete experiences reduced durability under prolonged sulfate attack.The research outcomes provide critical references for durability assessment of concrete structures in corrosive environments.

关 键 词：铁路 低热水泥 混凝土 硫酸盐侵蚀 抗压强度 耐蚀系数 

分 类 号：U213.1[交通运输工程—道路与铁道工程] TU37[建筑科学—结构工程]