基于双K断裂模型的海水对混凝土断裂性能的影响研究  

Research on the effect of seawater on the fracture performance of concrete based on double-K model

作　　者：李靖 丁晓唐[1] 丁力栋 LI Jing;DING Xiaotang;DING Lidong(College of Civil and Transportation Engineering,Hohai University,Jiangsu Nanjing,210098,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《河北工程大学学报（自然科学版）》2018年第3期6-10,16,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金重点项目(51139001)

摘　　要：基于双K断裂模型,通过三点弯曲试验研究了海水养护、海水搅拌对混凝土断裂性能的影响。试验结果表明:海水拌制明显降低了混凝土的起裂荷载及峰值荷载,对混凝土的起裂断裂韧度KIcini及失稳韧度KIcun也均有降低作用,降幅最大分别达到52.6%和25.6%;海水养护对双K断裂参数影响相对较小,起裂断裂韧度及失稳韧度降幅范围分别为3.2%~23.4%、12.7%~20.8%。此外在海水影响下,计算得到的断裂能有较明显的降低,降幅范围在14.5%~28.1%。海水对混凝土立方体抗压强度影响较小。Based on the double-K model,the effect of seawater curing and seawater agitation on the fracture properties of concrete was studied by three-point bending test in this paper. The test results show that：Seawater mixing reduces significantly the initiation load and peak load of concrete,and also reduces the initiation fracture toughness and instability fracture toughness of concrete. The maxima of decreasingare 52.6% and 25.6% respectively. The effect of seawater maintenance on the fracture parameters of double-K is relatively small,and the ranges of fracture toughness and instability toughness are 3.2%-23.4% and 12.7%-20.8%,respectively. In addition,under the influence of seawater,the calculated fracture energy is obviously reduced,and the range of decrease is 14.5%-28.1%.The effect of seawater on the compressive strength of concrete cubes is fairly minor.

关 键 词：混凝土 双K断裂模型 海水 断裂性能 

分 类 号：TU528.1[建筑科学—建筑技术科学]