材料导报 2022, Vol. 36 Issue (Z1): 21120009-5
无机非金属及其复合材料
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冻融循环与预应力共同作用下混凝土抗压强度试验研究
陈瑞明1 , 向阳开2 , 梁路3 , 赵毅2
1 贵阳职业技术学院城乡规划建设分院,贵阳 550081 2 重庆交通大学材料科学与工程学院,重庆 400074 3 石河子大学水利建筑工程学院,新疆 石河子 832000
Experimental Study on Compressive Strength of Concrete Under Combined Action of Freeze-Thaw Cycle and Prestress
CHEN Ruiming1 , XIANG Yangkai2 , LIANG Lu3 , ZHAO Yi2
1 Urban and Rural Planning and Construction Branch of Guiyang Vocational and Technical College, Guiyang 550081, China 2 School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China 3 School of Water Conservancy and Construction Engineering, Shihezi University, Shihezi 832000, Xinjiang, China
摘要 为研究冻融循环与预应力共同作用下混凝土的强度损失规律,对σ con /f ptk =0.4、0.6、0.8三种预应力条件下的无粘结预应力梁开展25次、50次、75次快速冻融循环试验,研究了冻融循环、预应力作用以及二者共同作用对混凝土抗压强度的影响。研究结果表明,当预应力达到σ con /f ptk =0.8时,各冻融循环次数下的混凝土抗压强度较为接近,此时冻融循环对混凝土抗压强度的影响最小;随着冻融循环次数的增加,无预应力混凝土的抗压强度损失远大于预应力混凝土抗压强度的损失,且预应力越大的混凝土抗压强度降低越缓慢;预应力对冻融循环条件下混凝土抗压强度的衰减有抑制作用,随着预应力的增加,这种抑制作用越明显。最后,根据试验结果建立考虑冻融循环和预应力作用条件下混凝土的抗压强度损失计算模型。
关键词:
冻融循环
预应力混凝土
抗压强度
损失规律
计算模型
Abstract: In order to study the strength loss law of concrete under the combined action of freeze-thaw cycle and prestress. 25 cycles, 50 cycles and 75 cycles of rapid freeze-thaw cycles were carried out on unbonded prestressed beams under σ con /f ptk = 0.4, 0.6 and 0.8 prestressing conditions. The law of concrete strength loss under the combined action of freeze-thaw cycle and prestress is studied. The test results show that when the prestress reaches σ con /f ptk = 0.8, the compressive strength of concrete under each freeze-thaw cycle is relatively close, and the freeze-thaw cycle has the least impact on the compressive strength of concrete. With the increase of freeze-thaw cycles, the loss of compressive strength of non prestressed concrete is much greater than that of prestressed concrete, and the greater the prestress, the slower the reduction of compressive strength.Prestress can inhibit the attenuation of concrete compressive strength under freeze-thaw cycle. With the increase of prestress, this inhibition is more obvious.Finally, according to the test results, the calculation model of compressive strength loss of concrete considering freeze-thaw cycle and prestress is established.
Key words:
freeze-thaw cycle
prestressed concrete
compressive strength
law of loss
computational model
出版日期: 2022-06-05
发布日期: 2022-06-08
基金资助: 山区桥梁及隧道工程国家重点实验室开放基金(CQSLBF-Y14-13)
通讯作者:
xiangyangkai@163.com
作者简介: 陈瑞明,2013年6月、2016年6月分别于呼伦贝尔学院和重庆交通大学获得工学学士学位和硕士学位。2016年到贵阳职业技术学院工作至今,主要从事结构工程以及混凝土结构耐久性方面的研究。发表论文7篇,授权实用新型专利2项,参编专著1部。 向阳开,1986年于长沙铁道学院取得学士学位,1989年于重庆建筑工程学院取得硕士学位,2000年于西南交通大学取得博士学位。重庆交通大学材料科学与工程学院党委书记、教授、博士,先后负责了国家级、省部级和其他各类科研项目10多项,公开发表学术论文近30篇,EI检索及中文核心期刊近20篇。参编出版了研究生教材《高等钢筋混凝土结构》(人民交通出版社)及本科生教材《钢结构》(重庆大学出版社)等。主要从事土木桥梁结构工程、预应力混凝土和钢筋混凝土结构及材料的力学行为分析方面的研究。
引用本文:
陈瑞明, 向阳开, 梁路, 赵毅. 冻融循环与预应力共同作用下混凝土抗压强度试验研究[J]. 材料导报, 2022, 36(Z1): 21120009-5.
CHEN Ruiming, XIANG Yangkai, LIANG Lu, ZHAO Yi. Experimental Study on Compressive Strength of Concrete Under Combined Action of Freeze-Thaw Cycle and Prestress. Materials Reports, 2022, 36(Z1): 21120009-5.
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