| 摘要: |
| 通过室内加速腐蚀试验，用球压痕和超声波方法研究了含不同矿物掺合料（高钙粉煤灰、磨细高炉矿渣、硅粉）混凝土在模拟酸雨(pH=2)下的损伤劣化过程及特点.结果表明：在混凝土中掺入一定量、适宜的矿物掺合料，因其发生火山灰反应而使体系Ca(OH)2含量降低、微结构更加致密，在一定程度上延缓了酸雨对混凝土的侵蚀破坏进程，提高了混凝土的耐酸雨侵蚀能力，其中尤以高钙粉煤灰、磨细高炉矿渣和硅粉三元复掺效果最为明显，但总体上延缓作用有限，含矿物掺合料混凝土在酸雨侵蚀持续作用下仍会遭到严重侵蚀破坏.含矿物掺合料混凝土酸雨侵蚀破坏主要是H+溶蚀性破坏和SO2-4膨胀性破坏共同作用的结果. |
| 关键词: 混凝土 酸雨侵蚀 矿物掺合料 表面损伤 内部损伤 |
| DOI：10.3969/j.issn.1007 9629.2013.03.007 |
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| Effect of Mineral Admixtures on Deterioration of Concreteunder Acid Rain Attack |
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WANG Kai1, MA Bao guo2, ZHANG Hong yuan1
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1.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China;2.State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
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| Abstract: |
| Through accelerated corrosion tests, the damage processes of the concretes containing different mineral admixtures(high calcium fly ash(HFA), ground granulated blast furnace slag(GGBFS) and silica fume(SF)) in simulated acid rain solutions(pH=2) were investigated by sphere indentation and ultrasonoscope methods. The results show that the addition of suitable mineral admixtures can retard the damage process of concretes caused by acid rain and improve its resistance to some extent, especially for those with HFA, GGBFS and SF added together. The improvement results from the pozzolanic effect of mineral admixtures to reduce the content of Ca(OH)2 in concretes and make their microstructure more density. However, the function is finite as a whole and the concretes containing mineral admixtures can still suffer severe damage under the sustaining action of acid rain attack. The deterioration of the concretes containing mineral admixtures in acid rain solutions is caused by the dissolving erosion of H+ and the expanding erosion of SO4 2- together. |
| Key words: concrete acid rain attack mineral admixture surface damage inner damage |
