SAC海砂混凝土在不同硫酸类型下的劣化研究三改

精品文档---下载后可任意编辑季韬，林旭健，林魁（福州大学土木工程学院，福建 福州 350116）摘要：生物硫酸对混凝土的侵蚀作用远大于化学硫酸。为讨论不同硫酸类型对混凝土的劣化影响，（氧化硫硫杆菌）模拟生物硫酸腐蚀（pH=1.0）并以化学硫酸作对比，测试质量、强度、腐蚀层 pH 值、固化率变化及孔结构变化评价腐蚀过程中 SAC 海砂混凝土的劣化程度，分析 SAC 海砂混凝土在生物硫酸腐蚀下的劣化影响。关键字：SAC，硫酸，海砂，劣化Study on SAC sea sand concrete degradation mechanism by different typeof sulfuric acidTao Ji,Xu Jian Lin,Kui Lin(College of Civil Engineering，Fuzhou University，Fuzhou，Fujian 350108)Abstract：erosion effect to concrete by biological sulfate is much higher thanChemical sulfuric acid. For the research of different types of sulfate to effect ofconcrete degradation,This topic uses T.t bacteria (thiobacillus thiooxidans) to simulate the biological sulfate corrosion test with comparing chemical sulfuric acid and using three kinds of sulphuric acid concentration()to study the influence rules of SAC sea sand concrete onthe performance variation under biological sulfate corrosion. The experiment evaluates the corrosion degree of samples during the corrosion process based on quality、strength、pH of corrosion layer and changes of chloride ion binding rateand change of pore structureevaluate the degradation degreeof SAC sea sand concrete in the process of corrosion, and analyst degradation influenceof SAC sea sand concrete under thebiological sulfate corrosion .Keywords:SAC,biological sulfuric acid,sea sand, degradation1. 引言生物硫酸腐蚀，是指微生物产生的硫酸对混凝土表面的破坏，使混凝土表层疏松、砂浆脱落，产生开裂和最终的钢筋锈蚀，缩短混凝土构件的使用寿命，影响设施的整体功能，并带来严重的经济损失[1]。1945 年，Parker 等[2]在它的讨论中发现海洋工程中，混凝土腐蚀的主要原因是生物硫酸腐蚀，并指出生物硫酸与混凝土内部的 Ca(OH)2...