养护温度与引气剂对等强度混凝土强度与孔隙结构研究  

Study on strength and pore structure of equal strength concrete with curing temperature and air entraining agent

作　　者：陈子瑜 王起才[1,2] 代金鹏[1,2] 毕瑞枭 楚昊 王坚强 CHEN Ziyu;WANG Qicai;DAI Jinpeng;BI Ruixiao;CHU Hao;WANG Jianqiang(Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Control Technology,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《混凝土》2023年第1期21-24,27,共5页Concrete

基　　金：国家自然科学基金(51768033,51808272);长江学者和创新团队发展计划滚动资助项目(IRT_15R29);甘肃省引导科技创新发展专项-重点研发能力提升项目(2019ZX-09);兰州交通大学青年科学基金(2017015)。

摘　　要：为研究养护温度和引气剂对等强度混凝土抗压强度和孔隙结构的变化规律,利用核磁共振试验(NMR)、压汞试验(MIP)等对标准养护和-3℃养护下混凝土试块进行测试。研究表明:-3℃养护引气混凝土在35 d龄期可以达到等强度,引气剂对混凝土达到等强度时间无明显影响;随着引气剂掺量的增加,孔隙率增大,孔隙结构发生劣化,混凝土试块抗压强度呈下降趋势;引气剂的加入使得-3℃养护混凝土与标准养护混凝土的孔隙结构逐渐出现差异,宏观上“等强度”,微观上不“等孔隙结构”。In order to study the variation of compressive strength and pore structure of concrete with equal strength under curing temperature and air entraining agent.Nuclear magnetic resonance(NMR)and mercury intrusion porosimetry(MIP)were used to test the concrete under standard curing and-3 ℃ curing.The results show that the air-entraining concrete cured at-3 ℃ can reach equal strength at35 days,and the air-entraining agent has no obvious effect on the time of reaching equal strength of concrete.With the increase of the amount of air entraining agent,the porosity increases,the pore structure deteriorates,and the compressive strength of concrete blocks shows a downward trend.The addition of air entraining agent makes the pore structure of-3 ℃ curing concrete and standard curing concrete gradually different,macroscopic“equal strength”,microscopic“not equal pore structure”.

关 键 词：负温混凝土 抗压强度 引气剂 孔隙结构 核磁共振 

分 类 号：TU528.064[建筑科学—建筑技术科学]