摘要
对于海洋及近岸的建筑物,用海砂替换河砂并用海水浇筑混凝土,不仅可以减少成本促进经济发展,而且缓解了河砂资源短缺的压力。国内外对海砂混凝土研究主要为氯盐侵蚀和钢筋锈蚀,采用不锈钢筋或纤维增强复合塑料(FRP)筋替代普通钢筋可以避免这种破坏,因此从国内外研究进展与海水海砂自身特点出发,分析研究了海水海砂混凝土在工程应用中的潜在危害。海水海砂中的硫酸盐在特定环境下会对混凝土造成硫酸盐侵蚀和延迟钙矾石破坏。海水中的主要化学成分对水泥水化、混凝土强度和耐久性、结构体积稳定性等问题有所影响。海砂中的贝壳对混凝土强度以及内部微观结构有所影响。对海水海砂混凝土做特定环境下的定性定量研究以及潜在危害之间的耦合作用研究是很有必要的。
For marine and coastal constructions,replacing river sand with sea sand and pouring concrete with sea water can t only reduce the aggregate cost and promote economic development,but also relieve the pressure of the shortage of river sand resources.Research of seawater and sea sand concrete mainly focuses on chloride attack and steel corrosion.Using stainless steel bars or fiber reinforced polymer(FRP)bars instead of ordinary steel bars can prevent this kind of damage.Therefore,on the bases of the advances of research and the characteristics of seawater and sea sand concrete,the potential harm of seawater and sea sand concrete in engineering application was analyzed.Under specific environment,sulfate attack and delayed ettringite damage would be caused because of sulfate in seawater or sea sand.The main chemical components from seawater or sea sand have influence on cement hydration,concrete strength and durability,structure volume stability and so on.Shells in sea sand have influence on concrete strength and microstructure.Qualitative research and quantitative research of seawater and sea sand concrete in specific environments was necessary,and the study of the coupling effect between the potential harm was essential.
作者
周继凯
何旭
王泽宇
周弘昊
孙沛钊
ZHOU Ji-kai;HE Xu;WANG Ze-yu;ZHOU Hong-hao;SUN Pei-zhao(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)
出处
《科学技术与工程》
北大核心
2018年第24期179-187,共9页
Science Technology and Engineering
基金
国家自然科学基金(51479048)
江苏省研究生科研创新项目(KYZZ16_0274)
国家级大学生创新创业训练计划(201710294028)资助
关键词
海水
海砂
混凝土
贝壳
耐久性
加速试验
seawater
sea sand
concrete
shell
durability
accelerated test
作者简介
第一作者简介:周继凯(1970—),男,汉族,博士,教授。E-mail:zhoujikai@163.com。
