寒冷地区桥用混凝土的性能分析  

Performance Analysis of Concrete for Bridge in Cold Area

作　　者：姜新爱 JIANG Xinai(Ruichang Branch,Jiujiang Highway Development Center,Ruichang,Jiangxi 332200,China)

机构地区：[1]九江市公路发展中心瑞昌分中心,江西瑞昌332200

出　　处：《黑龙江交通科技》2024年第11期111-114,共4页Communications Science and Technology Heilongjiang

摘　　要：为了研究寒冷地区桥用混凝土的性能,通过设计单一变量试验分析不同养护温度条件下,防冻剂掺量、养护龄期和不同温度对混凝土力学性能的影响,同时分析低温环境下混凝土的抗渗透性能和抗冻性能,研究结果表明:在低温环境下养护一定的时间,可以增强早期混凝土的抗压强度和提高早期混凝土的动弹模量;在相同养护条件下,后期混凝土的抗压强度和动弹模量会因为防冻剂的加入而下降;在不同养护条件下,掺入相同的防冻剂,对应的电通量也不一样,防冻剂的掺入提高了混凝土的电通量,在掺防冻剂的低温养护混凝土后期抗氯离子渗透性能较差;随着冻融次数的增加混凝土的相对动弹模量反而减小,混凝土的质量损失率变大,说明掺入防冻剂比未掺防冻剂的混凝土抗冻性能强。In order to study the performence of concrete for bridges in cold area,the effects of the amount of antifreeze,curing period and different temperature on the mechanical properties of concrete are analyzed by designing single variable test under different curing temperature,at the same time,the anti-permeability and anti-freezing properties of concrete under low temperature are analyzed,under the same curing condition,the compressive strength and dynamic modulus of later concrete will decrease because of the addition of antifreeze Under different curing conditions,adding the same antifreeze agent,the corresponding electric flux is different,the addition of antifreeze agent increases the electric flux of concrete,the anti-chloride ion permeability of low temperature curing concrete with antifreeze agent is poor at the later stage,and the relative dynamic modulus of concrete decreases with the increase of freezing and thawing times,and the mass loss rate of concrete increases,the results show that the frost resistance of concrete with antifreeze agent is better than that without antifreeze.

关 键 词：低温养护 桥用混凝土 抗压强度 抗渗透性能 抗冻性能 

分 类 号：U441[建筑科学—桥梁与隧道工程]