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刘倩,申向东,薛慧君,王仁远,刘政.氯盐侵蚀和干湿循环条件下浮石混凝土的耐久性[J].农业工程学报,2018,34(21):137-143.DOI:10.11975/j.issn.1002-6819.2018.21.017
氯盐侵蚀和干湿循环条件下浮石混凝土的耐久性
投稿时间:2018-05-11  修订日期:2018-09-20
中文关键词:  混凝土  侵蚀  孔隙度  氯盐  干湿循环  浮石  微观形貌  孔隙结构
基金项目:国家自然科学基金资助项目(51569021,51769025)
作者单位
刘倩 内蒙古农业大学水利与土木建筑工程学院呼和浩特 010018 
申向东 内蒙古农业大学水利与土木建筑工程学院呼和浩特 010018 
薛慧君 内蒙古农业大学水利与土木建筑工程学院呼和浩特 010018 
王仁远 内蒙古农业大学水利与土木建筑工程学院呼和浩特 010018 
刘政 内蒙古农业大学水利与土木建筑工程学院呼和浩特 010018 
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中文摘要:为了探究干湿循环条件下氯离子对浮石混凝土的侵蚀机制,借助核磁共振测试技术,分析浮石混凝土在干湿循环条件下微观孔隙结构特征,对侵蚀后的浮石混凝土内部微观结构进行X射线衍射物相分析与电镜扫描分析,进而探讨浮石混凝土抗氯离子侵蚀性能。研究结果表明,在氯盐侵蚀作用下,浮石混凝土和普通混凝土的质量损失变化率与相对动弹性模量变化趋势相一致;发现浮石混凝土谱面积是普通混凝土谱面积的1.0~1.7倍;浮石混凝土侵蚀破坏主要为内部发育新的小孔隙和中小孔隙向大孔隙和裂纹发育造成的,普通混凝土侵蚀破坏主要为内部的微小孔隙和小孔隙向大孔隙和裂纹发育造成的;浮石混凝土(0.1~1.0 μm孔隙所占比重较多,普通混凝土(0.01~0.1 μm孔隙所占比重较多;干湿循环120次后浮石混凝土孔隙度增加26.7%,自由流体饱和度减少1.0%,干湿循环120次后普通混凝土孔隙度增加77.8%,束缚流体饱和度减少7.3%;氯盐侵蚀后均生成以Friedel盐为代表的多种腐蚀结晶物。该研究可为浮石混凝土在氯盐环境下农业水利建设提供理论依据。
Liu Qian,Shen Xiangdong,Xue Huijun,Wang Renyuan,Liu Zheng.Durability of pumice concrete under chloride erosion and wet-dry cycling conditions[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(21):137-143.DOI:10.11975/j.issn.1002-6819.2018.21.017
Durability of pumice concrete under chloride erosion and wet-dry cycling conditions
Author NameAffiliation
Liu Qian College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China 
Shen Xiangdong College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China 
Xue Huijun College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China 
Wang Renyuan College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China 
Liu Zheng College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China 
Key words:concrete  erosion  porosity  chloride salt  dry-wet cycle  pumice  micromorphology  pore structure
Abstract: There are a large number of salt lakes distributed in Northwest China. The salt lake water is mainly composed of compound brine with multiple ions. The chloride ion shows the highest ion concentration in the salt lakes of Inner Mongolia, and a large area of saline soil is distributed around the salt lake. Due to the harsh climatic conditions and complex soil environment, concrete engineering structures and materials are often suffered from chloride erosion. In order to study the chloride ion erosion mechanism of pumice concrete under dry-wet cycle conditions, the indoor accelerated corrosion simulation test method is applied with pumice concrete and ordinary concrete as the test group and control group to study the mass loss of pumice concrete, the relative dynamic elastic modulus and the maximum depth of chloride ion erosion by chloride salt erosion and dry-wet cycle test in this paper. The nuclear magnetic resonance technology is used to invert the relaxation time T2 spectrum of pumice concrete on 0, 30, 60, 90, and 120 days. According to the relationship between the relaxation time T2 and pore radius, the T2 spectrum distribution can convert into the pore radius distribution. Thus, the 0-100 μm pores of concrete are divided into five grades: micro pores (0-0.01 μm), small pores (>0.01-0.1 μm), mid-small pores (>0.1-1.0 μm), medium pores (>1.0-10 μm) and large pores (>10-100 μm). Based on the comprehensive analysis of porosity, bound fluid saturation and free fluid saturation, the microscopic pore structure of pumice concrete under dry-wet cycles is analyzed. Moreover, the X-ray diffraction phase analysis and scanning electron microscope analysis are conducted on the internal microstructure of pumice concrete after chloride erosion to investigate the resistance to chloride ion erosion of pumice concrete. The results show that the mass loss rates of pumice concrete and ordinary concrete are consistent with the trend of relative dynamic elastic modulus under the action of chloride salt erosion; the maximum chloride ion erosion depths of pumice concrete and ordinary concrete increases with chloride salt erosion; with the level of chloride salt erosion upgrading, the spectral areas of pumice concrete and ordinary concrete gradually increased; the pore radius ranges of the first and second peaks of pumice concrete decreased, while that of the third peak increased; the pore radius ranges of the first and third peaks of ordinary concrete increase, while that of the second peak decreased; the pumice concrete erosion damage is mainly caused by large pores and cracks which are developed from the small and mid-small newborn pores, whereas the ordinary concrete erosion damage is primarily induced by the micro and small pores developing towards large pores and cracks. After chloride salt erosion, both pumice concrete and ordinary concrete produce a variety of corrosion crystals represented by Friedel salt. This paper can provide a theoretical basis for pumice concrete in the construction of agricultural water conservancy under the environment of chloride salt.
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