摘要
硫铝酸钙-氧化钙类双膨胀源膨胀剂HCSA具有膨胀能大、绝湿膨胀、膨胀与强度协调发展优点。针对CRTSIII型轨道板密闭环境特性,采用HCSA膨胀剂制备轨道板填充用自密实混凝土,有效解决了自密实混凝土收缩大、体积稳定性差和易开裂难题。新拌自密实混凝土流动性、填充性和抗离析性能良好,坍落扩展度680 mm、L型仪充填比0.92、J环障碍高差14 mm。硬化混凝土抗压强度、耐久性能优异,56 d抗压强度48.9 MPa、电通量374 C、抗盐冻性170 g/m^2、干燥收缩值291×10-6。揭板后,自密实混凝土板面密实、平整,无裂纹,性能满足TJ/GW 112—2013要求。
HCSA calcium sulphoaluminate hydrate-calcium hydroxide double sources expansive agent has the advantage of high restrained expansion rate,anhydrous expansion,coordinated development of expansion and strength.According to the closed environment of CTRSIII ballastless track,HCSA expansive agent was used to prepare self-compacting concrete(SCC)to solve the problems of great shrinkage,poor volume stability and easy to crack.Fresh SCC has good flowability,filling-ability and anti-segregation.Slump flow,L-box filling ratio and J-ring blocking step of SCC were 680 mm,0.92 and 14 mm,respectively.Besides,harden concrete also had good mechanical property and durability.Compressive strength,electric flux,salt-freezing resistance and drying shrinkage of SCC at 56 days were 48.9 MPa,374 C,170 g/m2 and 291×10-6.SCC slab was dense,even,crack-free after uncover the track board.The performance of SCC satisfied the requirements of TJ/GW 112-2013.
作者
李长成
张学文
贾福杰
赵顺增
LI Changcheng;ZHANG Xuewen;JIA Fujie;ZHAO Shunzeng(China Building Materials Academy,Beijing 100024,China;Zhengzhou Jianwen Special Material Technology Co.,Ltd.,Zhengzhou 452370,China)
出处
《混凝土》
CAS
北大核心
2018年第9期143-145,151,共4页
Concrete
基金
国家重点研发计划资助(2017YFB0310100)。
关键词
HCSA膨胀剂
自密实混凝土
绝湿膨胀
干燥收缩
HCSA expansive agent
self-compacting concrete
anhydrous expansion
drying shrinkage
