受冻环境对低温混凝土抗冻临界强度的影响  

Study on anti-frozen critical strength of low-temperature concrete under different cold environments

作　　者：刘润清[1,2] 刘军[2] 刘宇[2] 周红红[2] 

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024 [2]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《辽宁工程技术大学学报（自然科学版）》2011年第1期92-95,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(51072122);辽宁省自然科学基金资助项目(20082008);辽宁省百千万人才基金资助项目(2008921034)

摘　　要：为了更好的预防低温混凝土施工冻害,保证混凝土后期工作安全性,根据冬季施工环境中温度和湿度的变化,采用一次气冻、一次水冻、多次冻结三种受冻环境,通过研究低温混凝土遭受冻害转入标准养护后抗压强度的发展,确定不同受冻环境中混凝土抵抗早期冻害所需要的抗冻临界强度以及达到抗冻临界强度所需要的预养护时间,结果表明：一次气冻中,抗冻临界强度为3.7-4.4 MPa,需要预养护时间为18-32 h;一次水冻中,抗冻临界强度为7.8-8.9 MPa,需要预养护时间为34-46 h;多次冻结中,抗冻临界强度为7.0-8.2 MPa,需要预养护时间为32-44 h。该成果得出不同环境中低温混凝土的抗冻临界强度需求,可更经济、安全指导冬季现场混凝土施工的冻害预防工作。This study investigates the variation of compressive strength of low-temperature concrete cured under standard conditions after suffering frozen damage,such as frozen once under air,frozen once after soaking and repeatedly frozen.Based on the variation of compressive strength,the study determines the anti-frozen critical strength and the curing time required to recover to the anti-frozen critical strength.The study shows that the anti-frozen critical strength of low-temperature concrete ranges 3.7~4.4MPa requiring pre-curing time of 18~32h to resist frozen once under air,7.8~8.9MPa requiring pre-curing time of 34~46h to resist frozen once after soaking,and 7.0~8.2MPa requiring pre-curing time of 32~44h to resist repeatedly frozen.The experimental results can be used for taking reasonable precaution measures to avoid the early frozen damage on concrete work in winter season.

关 键 词：低温混凝土 抗冻临界强度 一次气冻 一次水冻 多次冻结 

分 类 号：TU528[建筑科学—建筑技术科学]