现代混凝土耐久性现状及原因浅析  

Situation and analysis of modern concrete durability

作　　者：胡杰[1] 田安国[1] 

机构地区：[1]淮海工学院土木系,江苏连云港222005

出　　处：《混凝土》2008年第4期29-31,共3页Concrete

基　　金：江苏省自然科学基金资助项目(BK2003050)

摘　　要：与以往混凝土标号普遍较低的情况相比,现代混凝土的组分发生了变化,并往往具有早强、高强的特点。现代混凝土组分的变化导致了温度应力高、收缩变形大。同时,早强和高强引发了混凝土的早裂和高脆性,大量不成熟的混凝土外加剂成为其耐久性的重要隐患。上述这些因素,导致了现代混凝土耐久性发生了衰减。文中提出,在对混凝土耐久性的评估中,必须充分考虑这些因素的影响。Comparing with lower grade concrete in early years, a lot of characters have been changed for modem concrete, such as the changes of concrete composition, to solidify early and high intensity, etc.The changes of concrete composition result in high temperature stress and large shrink.To solidify early leads to crack early.High intensity will induce high friability.Most immature admixture is the hidden trouble to concrete durability.The upper factors should be taken into account while evaluating concrete durability.

关 键 词：混凝土耐久性 早强 高强 混凝土外加剂 

分 类 号：TU528.01[建筑科学—建筑技术科学]