混凝土经历荷载历史后在硫酸盐干湿交替作用下损伤试验研究  

Damage behaviors of concrete due to sulfate attack in wet-dry cycle environment after experiencing historical load

作　　者：逯静洲[1] 刘亚[1] 朱孔峰 邵艳明[1] 

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《混凝土》2017年第2期37-41,共5页Concrete

基　　金：国家自然科学基金项目(51479174)

摘　　要：为研究高强混凝土(C60)与普通混凝土(C30)在经历历史荷载与环境因素联合作用下损伤演化规律,对历经单调加载历史和循环加载历史后的96块高强混凝土和102块普通混凝土试件,与硫酸盐-干湿循环耦合后进行损伤性能研究。以混凝土试件的质量变化率和相对动弹模表征混凝土内部的损伤程度。试验研究表明:一定范围内的历史荷载及单一硫酸盐侵蚀会有助于提高混凝土前期的力学性能,干湿循环-硫酸盐双重作用下则会明显的降低混凝土的力学性能。与普通混凝土相比,水灰比的降低和适量减水剂的掺入使得高强混凝土的孔隙结构得到优化,从而使高强混凝土抵抗环境及历史荷载等因素的能力增强。In order to investigate the damage evolution law of high strength concrete （ C60 ） and ordinary concrete （C30） under the couplingaction of loading history and environmental factors,96 pieces of high strength prism and 102 pieces of ordinary concrete prisms weredesigned and tested coupled damage under sulfate attack in wet-dry cycle environment respectively, after experiencing monotonic andcyclic loading history.The quality change rate and relative dynamic elastic modulus of concrete specimens were used to characterize thedamage degree of concrete.The results showed that historical load and single sulfate attack will be helpful to improve the mechanicalproperties of concrete in a certain range,while the mechanical properties of concrete can be decreased subjected to sulfate attack in wet-drycycle environment obviously.And compared with ordinary concrete, owing to the ratio of water cement is reduced and the appropriateamount of reducing agent admixture is admixed,pore structure of high strength concrete has been improved.So that the ability of highstrength concrete to resistance to environmental, historical load and other factors have been enhanced.

关 键 词：高强混凝土 损伤 荷载历史 硫酸盐 干湿循环 

分 类 号：TU528.01[建筑科学—建筑技术科学]