干旱区生态环境知识资源中心(Arid): 干湿循环作用下风积沙混凝土的抗硫酸盐侵蚀机理

Arid

	干湿循环作用下风积沙混凝土的抗硫酸盐侵蚀机理
其他题名	Sulfate Resistance Mechanism of Aeolian Sand Concrete Under Dry-Wet Cycles
	董瑞鑫; 申向东; 薛慧君; 刘倩
来源期刊	材料导报
ISSN	1005-023X
出版年	2020
卷号	34 期号:12B 页码:24040-24044
中文摘要	选取内蒙古自治区乌兰布和沙漠的风积沙作为细骨料,用40%的风积沙替代部分河砂,采用核磁共振技术对风积沙混凝土的孔隙结构特征进行测试分析,利用扫描电子显微镜观察风积沙混凝土的微观形貌,并用X射线衍射技术分析混凝土的物相成分。研究表明:质量损失率在干湿循环60次时出现拐点,风积沙混凝土和普通混凝土的抗压耐蚀系数分别降低到84%、87%;风积沙组谱面积是普通组的1.59~ 2.76倍,风积沙混凝土最大孔隙减小了34.1%,普通组最大孔隙减小了29.3%;风积沙混凝土和普通混凝土中无害孔的占比均不超过10%,孔隙度都与自由流体饱和度的变化成正比,混凝土内部存在着小孔隙向大孔隙演变的特性;风积沙混凝土和普通混凝土干湿循环120次对比干湿循环0次均出现了较多的C aSO_4·2H_2O衍射峰,腐蚀结晶物多为硫酸盐和碳酸盐;风积沙组的水泥浆体出现18~36mum的细长裂缝,普通组出现大量AFt。研究成果可为混凝土耐久性和盐侵环境下的工程建筑提供理论参考。
英文摘要	In this study,the aeolian sand of the Ulan Buh Desert in Inner Mongolia Autonomous Region was selected as the fine aggregate.In addition,40% aeolian sand was used to replace a portion of the river sand,the pore structure characteristics of aeolian sand concrete were tested and analyzed by means of NMR technology,and the micro morphology and phase composition of aeolian sand concrete were observed and analyzed using SEM and X-ray diffraction technology.As shown by the results,after 60 dry-wet cycles the mass loss rate reaches an " inflection point",in which case the compressive and corrosion resistance coefficients of the aeolian sand concrete and ordinary concrete respectively decrease to 84% and 87%.Additionally,the spectral area of the aeolian sand concrete is 1.592.76 times of that of the ordinary concrete,while the maximum porosity of the aeolian sand concrete is reduced by 34.1%,and the maximum porosity of the ordinary concrete is reduced by 29.3%.The proportion of harmless pores in the aeolian sand concrete and ordinary concrete is less than 10%,and the porosity is in direct proportion to the change rule of free fluid saturation,while a characteristic of small pores evolving into large pores in the concrete is present.There are a greater number of CaSO_4·2H_2O diffraction peaks in both the aeolian sand concrete and ordinary concrete after 120 dry-wet cycles compared with 0 dry-wet cycles,and the corrosion crystals are mostly sulfate and carbonate.Long and thin cracks 1836 mum in length appear in the cement paste of the aeolian sand concrete,and a large number of AFt are found in the ordinary concrete.The above research results provide a theoretical reference for research regarding the durability of concrete and engineering construction in salt erosion environments.
中文关键词	风积沙混凝土 ; 硫酸盐干湿循环 ; 孔隙特征 ; 盐蚀产物 ; 侵蚀机理
英文关键词	aeolian sand concrete sulfate dry-wet cycle pore characteristics salt erosion products erosion mechanism
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Construction & Building Technology
CSCD记录号	CSCD:6875387
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353333
作者单位	董瑞鑫, 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特, 内蒙古 010018, 中国. 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, 内蒙古 010018, 中国. 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, 内蒙古 010018, 中国. 刘倩, 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特, 内蒙古 010018, 中国.
推荐引用方式 GB/T 7714	董瑞鑫,申向东,薛慧君,等. 干湿循环作用下风积沙混凝土的抗硫酸盐侵蚀机理[J]. 内蒙古农业大学,2020,34(12B):24040-24044.
APA	董瑞鑫,申向东,薛慧君,&刘倩.(2020).干湿循环作用下风积沙混凝土的抗硫酸盐侵蚀机理.材料导报,34(12B),24040-24044.
MLA	董瑞鑫,et al."干湿循环作用下风积沙混凝土的抗硫酸盐侵蚀机理".材料导报 34.12B(2020):24040-24044.