| 摘要: |
| 在典型工业环境下开展了混凝土的快速硫化试验，研究了水灰比、温度和SO2体积分数对混凝土硫化深度的影响.建立了典型工业环境下混凝土的硫化深度预测模型.采用扫描电镜（SEM）和X射线衍射（XRD）分析了混凝土的硫化机理.结果表明：混凝土硫化深度随着硫化龄期的延长而增大；水灰比为0.57的混凝土在50 ℃、SO2体积分数为0.9%条件下硫化20 d时硫化深度最大，达到5.27 mm；混凝土在硫化前期的硫化产物为针状钙矾石晶体，硫化20 d时生成大量板状石膏晶体. |
| 关键词: 典型工业环境 混凝土 硫化机理 硫化深度 预测模型 |
| DOI：10.3969/j.issn.1007-9629.2022.06.011 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（52078413，51808437）；教育部“创新团队发展计划”（IRT_17R84） |
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| Prediction Model and Sulphuration Mechanism of Concrete in Typical Industrial Environment |
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Lü Yao1, NIU Ditao1,2, LIU Xiguang1,2, ZHANG Shaohui1, CHEN Guoxin1
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1.School of Civil Engineering， Xi'an University of Architecture and Technology， Xi'an 710055， China;2.State Key Laboratory of Green Building in Western China， Xi'an University of Architecture and Technology， Xi'an 710055， China
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| Abstract: |
| The rapid sulphuration test of concrete in typical industrial environment was carried out. Variations of concrete sulphuration depth with water-cement ratio， temperature and SO2 volume fraction were studied. The prediction model of concrete sulphuration depth in typical industrial environment was established. The sulphuration mechanism of concrete was analyzed by means of scanning electron microscope （SEM） and X-ray diffraction （XRD）. The results show that the sulphuration depth of concrete increases with increasing sulphuration age. When the temperature is 50 ℃ and the SO2 volume fraction is 0.9%， the sulphuration depth of concrete with a water-cement ratio of 0.57 reaches 5.27 mm at the age of 20 days. The sulphuration product is acicular crystal ettringite at the initial stage of sulphuration， and a large number of plate crystal gypsum is formed in the specimen at the age of 20 days. |
| Key words: typical industrial environment concrete sulphuration mechanism sulphuration depth prediction model |
