干旱区生态环境知识资源中心(Arid): 干湿循环与风沙吹蚀作用下风积沙混凝土的抗硫酸盐耐久性

Arid

	干湿循环与风沙吹蚀作用下风积沙混凝土的抗硫酸盐耐久性
其他题名	Sulfate Durability of Aeolian Sand Concrete Under Dry-Wet Cycles and Sand Blowing
	董瑞鑫; 申向东; 薛慧君; 刘倩; 维利思
来源期刊	材料导报
ISSN	1005-023X
出版年	2020
卷号	34 期号:10B 页码:20053-20060
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,用掺量为40%的风积沙替代部分河砂,运用扫描电子显微镜和X射线衍射技术观测并分析风积沙混凝土的微观形貌和物相成分,采用核磁共振技术对风积沙混凝土孔隙结构特征进行测试分析,并对其耐久性进行寿命预测。研究表明:风积沙混凝土在耦合工况下的质量损失较单一干湿循环作用下的质量损失增加了2.21倍,耦合工况下的抗压耐蚀系数曲线始终在单一干湿循环作用下的抗压耐蚀系数曲线下方;D120的最大侵蚀深度为1.66 mm,D120S8的沟壑深度为3.51 mm;经过干湿循环120次后,单一干湿作用的水泥浆体出现长度为9 mum的细长裂缝,耦合工况中出现长度为18~36 mum的贯通裂缝,腐蚀结晶物多为硫酸盐和碳酸盐;两种工况下T_2谱主要呈现两个峰,风积沙混凝土的孔隙在耦合作用下的增长速率大于在单一干湿循环作用下的增长速率;随着干湿循环次数的增加,小孔隙减少,大孔隙增多,其内部的小孔隙向大孔隙转化,孔隙度都与自由流体饱和度的变化规律成正比;通过寿命预测模型求得风积沙混凝土的服役时间为125 a,该研究可为风积沙混凝土在风蚀区硫酸盐环境下的工程建设提供理论依据。
英文摘要	Aeolian sands from Ulan Buh Desert in Inner Mongolia Autonomous Region were selected as fine aggregates,40% do sage of aeolian sand was used to replace part of river sand,and scanning electron microscopy and X-ray diffraction techniques were used to observe and analyze the microscopic morphology of aeolian sand concrete.The phase composition was tested by NMR technique on the pore structure characteristics of aeolian sand concrete,and its durability was predicted.The research shows that the mass loss of aeolian sand concrete under coupling conditions is 2.21 times higher than that under a single dry-wet cycle.The curve of compressive and corrosion resistance under coupling conditions is always lower than that of single dry-wet cycle;the maximum erosion depth of D120 is 1.66 mm,the depth of the ditch of D120S8 is 3.51 mm;after 120 cycles of dry and wet cycles,a 9 mum slender crack appears in the cement slurry of single dry and wet action,and a through crack of 18-36 mum appears in the coupling condition.Most of the corrosion crystallization materials are sulfate and carbonate;the T_2 spectrum mainly shows two peaks under the two conditions.The pore growth rate of aeolian sand concrete under coupling is greater than that of single dry-wet cycle;with the increase of the number of dry-wet cycles,small pores decrease,the large pores increase,transforming the small pores into large pores,and the porosity is proportional to the change of free fluid saturation;the service life of the aeolian sand concrete is 125 a by the life prediction model.This paper provides theoretical basis for the construction of aeolian sand concrete in the sulfate environment of wind erosion area.
中文关键词	风积沙混凝土 ; 干湿循环 ; 风沙吹蚀 ; 微观形貌 ; 物相成分 ; 孔隙特征 ; 寿命预测
英文关键词	aeolian sand concrete dry-wet cycle wind-blown erosion micro-morphology phase composition pore characteristics life prediction
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Construction & Building Technology
CSCD记录号	CSCD:6908020
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/2XILL650/353332
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. 维利思, 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. 干湿循环与风沙吹蚀作用下风积沙混凝土的抗硫酸盐耐久性[J]. 内蒙古农业大学,2020,34(10B):20053-20060.
APA	董瑞鑫,申向东,薛慧君,刘倩,&维利思.(2020).干湿循环与风沙吹蚀作用下风积沙混凝土的抗硫酸盐耐久性.材料导报,34(10B),20053-20060.
MLA	董瑞鑫,et al."干湿循环与风沙吹蚀作用下风积沙混凝土的抗硫酸盐耐久性".材料导报 34.10B(2020):20053-20060.