矿物掺合料对水泥胶砂抗硫酸盐侵蚀性能的影响

摘要/Abstract

摘要： 富硫酸盐环境下的隧道工程施工,应重视混凝土结构的耐腐蚀问题。本研究依托云南牟元高速公路隧道项目,采用干湿循环硫酸盐侵蚀的方法,探究不同矿物掺合料(粉煤灰、石灰石基微粉、硅基微粉)单掺或复掺对混凝土表观形貌、质量、抗压强度的影响,并利用扫描电子显微镜和X射线衍射等手段分析了试件的微观结构和产物变化。结果表明,石灰石基微粉和硅基微粉具有良好的填充效果及火山灰活性,50 ℃水浴养护7 d后,可生成额外的水化硅酸钙(C-S-H)凝胶,减少钙相的脱出,降低试件表观形貌破坏程度、质量损失与抗压强度损失。经历75个干湿循环侵蚀后,纯水泥、单掺10%粉煤灰、单掺10%石灰石基微粉、单掺10%硅基微粉、复掺5%粉煤灰和5%硅基微粉试件质量下降21.7%、32.2%、16.9%、12.1%和20.1%,腐蚀后强度分别占初始值的79.3%、49.9%、101.5%、95.4%和84.5%。当试件中包裹氢氧化钙(CH)晶体的C-S-H凝胶被严重侵蚀后,干湿循环条件使CH晶体与空气中的CO₂频繁接触,反应生成大量碳酸钙晶体。

关键词: 胶砂, 矿物掺合料, 硫酸盐侵蚀, 微观结构, 产物分析

Abstract: In tunnel construction under sulfate-rich environment, attention should be paid to the erosion resistance of concrete structures. Based on the tunnel project of Mouyuan Expressway in Yunnan Province, this study used the method of dry-wet cycle sulfate erosion to explore the effects of different mineral admixtures (fly ash, limestone-based micropowder, silicon-based micropowder) on the apparent morphology, mass and compressive strength of concrete. The microstructure and product changes of specimens were analyzed by means of scanning electron microscopy and X-ray diffraction. The results show that limestone-based micropowder and silicon-based micropowder have good filling effect and pozzolanic activity. After curing in water bath at 50 ℃ for 7 d, additional hydrated calcium silicate (C-S-H) gel can be generated, which can reduce the removal of calcium phase, reduce the damage degree of apparent morphology, mass loss and compressive strength loss of specimens. After 75 dry-wet cycles, the mass of pure cement, 10% fly ash, 10% limestone-based micropowder, 10% silicon-based micropowder, 5% fly ash and 5% silicon-based micropowder decrease by 21.7%, 32.2%, 16.9%, 12.1% and 20.1%, respectively. The strength after erosion accounted for 79.3%, 49.9%, 101.5%, 95.4% and 84.5% of the initial value, respectively. When the C-S-H gel wrapped with calcium hydroxide (CH) crystal in the specimen is seriously eroded, the dry-wet cycle conditions make the CH crystal frequently contact with CO₂ in the air and react to generate a large number of calcium carbonate crystals.

Key words: mortar, mineral admixture, sulfate erosion, microstructure, product analysis

中图分类号:

TQ172

王丽军, 祝鹏程, 普如敏, 周小涵, 王志清. 矿物掺合料对水泥胶砂抗硫酸盐侵蚀性能的影响[J]. 硅酸盐通报, 2025, 44(3): 862-871.

WANG Lijun, ZHU Pengcheng, PU Rumin, ZHOU Xiaohan, WANG Zhiqing. Effects of Mineral Admixtures on Sulfate Erosion Resistance of Cement Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 862-871.

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