干旱区生态环境知识资源中心(Arid): 风积沙轻骨料混凝土冻融损伤及寿命预测研究

Arid

	风积沙轻骨料混凝土冻融损伤及寿命预测研究
其他题名	Study of the freezing-thawing damage and life prediction of aeolian lightweight aggregate concrete
	董伟; 申向东; 赵占彪; 何静; 俞婷婷
来源期刊	冰川冻土
ISSN	1000-0240
出版年	2015
卷号	37 期号:4 页码:1009-1015
中文摘要	基于浮石轻骨料混凝土为基础, 将不同质量的风积沙作为细骨料替代部分河砂, 研究风积沙轻骨料混凝土冻融损伤机理及服役寿命. 通过室内快速冻融循环试验, 定量分析风积沙轻骨料混凝土的抗冻耐久性能. 在整个冻融循环期内, 相对动弹性模量的变化规律可分为直线下降阶段、直线+曲线下降阶段、曲线下降阶段. 以此为基础, 建立轻骨料混凝土直线和曲线双段式相对动弹性模量衰减方程, 依据5组混凝土的抗冻试验结果对方程进行了验证, 并预测其在西部地区的服役寿命. 结果表明: 直线和曲线双段式的相对动弹性模量衰减方程能够准确的反应混凝土冻融损伤劣化规律. 风积沙最优替代率为20%, 可以满足25 a的使用寿命. 损伤模型可为沙漠地区混凝土使用提供一定的理论依据.
英文摘要	In this paper, taking pumice lightweight aggregate concrete as basis and taking different aeolian sands as fine aggregate to replace part of river sand, freezing-thawing damage mechanisms and service life of the aeolian sand light weight aggregate concrete were investigated. Antifreeze durability of aeolian sand pumice lightweight aggregate concrete was investigated through freezing-thawing cycle test at various ambient temperatures. In the whole freezing-thawing cycle period, the relative dynamic elastic modulus has straight line decline phase, straight line plus curve downward phase and curve decline phase, which became the basis of establishing a double segments (a straight one and a curve one) of relative dynamic elastic modulus attenuation equation. Besides, the equation was verified and the concrete lifetime in West China was predicted according to five tests of freezing-thawing cycles. Results demonstrated that the double segments of relative dynamic elastic modulus attenuation equation could accurately describe the variation of concrete freezing-thawing damage. What’s more, the optimal substitution rate of aeolian sand was 20%, the lifetime of aeolian sand pumice lightweight aggregate concrete could meet the application for more than 25 years. The damage model is a theoretical basis for applying concrete in desert areas.
中文关键词	浮石轻骨料混凝土 ; 风积沙 ; 衰减方程 ; 服役寿命 ; 冻融损伤
英文关键词	pumice lightweight aggregate concrete aeolian sand attenuation equation service life freezing-thawing damage
语种	中文
国家	中国
收录类别	CSCD
WOS类目	CONSTRUCTION BUILDING TECHNOLOGY
WOS研究方向	Construction & Building Technology
CSCD记录号	CSCD:5641826
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/2XILL650/232367
作者单位	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	董伟,申向东,赵占彪,等. 风积沙轻骨料混凝土冻融损伤及寿命预测研究[J]. 内蒙古农业大学,2015,37(4):1009-1015.
APA	董伟,申向东,赵占彪,何静,&俞婷婷.(2015).风积沙轻骨料混凝土冻融损伤及寿命预测研究.冰川冻土,37(4),1009-1015.
MLA	董伟,et al."风积沙轻骨料混凝土冻融损伤及寿命预测研究".冰川冻土 37.4(2015):1009-1015.