摘要
在混凝土中掺入锂渣和聚丙烯纤维,制备普通混凝土(PC)、锂渣混凝土(PLiC)、聚丙烯纤维锂渣混凝土(PFLiC),模拟盐侵环境浸泡侵蚀时间对不同混凝土抗压强度、劈裂抗拉强度、抗折强度及动弹性模量的影响。结果表明:盐侵环境下PFLiC的力学性能及性能退化速率优于PC,在混凝土中双掺锂渣与聚丙烯纤维能提高混凝土在盐侵环境下的力学性能;提出在盐侵环境下的抗压强度损伤模型,其中PFLiC的拟合效果较好,其R^(2)为0.99859,能较好地模拟PFLiC在模拟盐渍土溶液中抗压强度劣化演化规律;根据强度损伤模型,预测模拟盐侵环境下PC、PLiC、PFLiC的服役寿命分别为135、148、177 d。
By incorporating lithium slag and polypropylene fibers into concrete,three different types of concrete were designed:plain concrete(PC),lithium slag concrete(PLiC),and polypropylene fiber lithium slag concrete(PFLiC).The effects of simulated salt-affected environments with different immersion ages on the compressive strength,splitting tensile strength,flexural strength,and dynamic elastic modulus of different concretes were studied.The results show that the mechanical properties and performance degradation rate of PFLiC are superior to those of PC in a salt-affected environment.The dual addition of lithium slag and polypropylene fibers in concrete can improve the mechanical properties of concrete in a salt-affected environment.A compressive strength damage model under salt-affected environments was proposed,and the fitting effect of PFLiC was better,with R^(2) being 0.99859,which can better simulate the evolution law of compressive strength deterioration of PFLiC in simulated salt-affected soil solution.Based on the obtained strength damage model,the predicted compressive strength lifetimes of PC,PLiC,and PFLiC in a simulated salt-affected environment were 135,148,and 177 d,respectively.
作者
张广泰
韩佳铄
张杰
ZHANG Guangtai;HAN Jiashuo;ZHANG Jie(School of Architectural Engineering,Xinjiang University,Urumqi 830017,China;Xinjiang Key Laboratory of Building Structure and Seismic,Urumqi 830017,China)
出处
《新型建筑材料》
2026年第1期16-21,119,共7页
New Building Materials
基金
国家自然科学基金项目(52268035)
新疆维吾尔自治区自然科学基金重点项目(XJEDU2021D01D07)。
关键词
锂渣
聚丙烯纤维
盐侵环境
力学性能
损伤模型
二次函数
lithium slag
polypropylene fiber
salt invasion environment
mechanical properties
damage model
quadratic function
