锂渣和荷载对不同龄期混凝土气体渗透性的影响  

Effect of continuous load and lithium slag on gas permeability of concrete

作　　者：郝恩泽 温勇[1] 马丽莎[1] 韩国旗 李宇航 HAO Enze;WEN Yong;MA Lisha;HAN Guoqi;LI Yuhang(College of Civil Engineering and Architecture,Xinjiang University,Urumqi 830047,China;College of Civil Engineering,Kashi University,Kashi 844006,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047 [2]喀什大学土木工程学院,新疆喀什844006

出　　处：《混凝土》2024年第6期48-52,共5页Concrete

基　　金：国家自然科学基金(52168036);上海市工程结构安全重点实验室开放课题(2018-KF08);新疆维吾尔自治区天山青年划项目(2018Q014);2021年自治区自然科学基金(2021D01B04)。

摘　　要：为研究持续压荷载和锂渣掺量对不同龄期混凝土气体渗透性能的影响,设计强度等级为C20、C30、C40的不同锂渣掺量的混凝土,取试样极限压应力的0.1倍、0.3倍、0.5倍作为试验施加的持续荷载,测定7 d、14 d、28 d、56 d龄期时各试样的抗压强度和气体渗透系数。通过分析不同水平持续压荷载下试样的气体渗透系数变化情况发现:应力比在0.3以下时,试样气体渗透系数多处于波动状态;应力比大于0.3后,气体渗透系数明显增大。应力比在0.3以下时,10%掺量的锂渣能显著降低试样的气体渗透系数,表明适量锂渣能有效降低混凝土在低应力比作用下的内部孔隙连通程度,并抑制应力作用下混凝土微裂纹的发展。In order to study the effects of continuous compressive load and lithium slag admixture on the gas permeability of concrete at different ages,concrete with different lithium slag admixtures of strength classes C20,C30 and C40 were designed,and 0.1,0.3 and 0.5 times of the ultimate compressive stress of the specimens were taken as the test applied continuous load,and the compressive strength and gas permeability coefficients of the specimens at ages of 7 d,14 d,28 d and 56 d were measured.By analyzing the changes of gas permeability coefficients of the specimens under different levels of continuous compression loads,it was found that the gas permeability coefficients of the specimens fluctuated when the stress ratio was below 0.3.After the stress ratio was greater than 0.3,the gas permeability coefficients increased significantly.When the stress ratio is below 0.3,10% of lithium slag can significantly reduce the gas permeability coefficient of the specimens,indicating that the appropriate amount of lithium slag can effectively reduce the degree of internal pore connectivity of concrete and inhibit the development of concrete microcracks under stress.

关 键 词：锂渣 气体渗透性 持续荷载 孔隙连通系数 

分 类 号：TU528.01[建筑科学—建筑技术科学]