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硫铝酸钙一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680mm、L型仪充填比0.92、J环障碍高差14mm。硬化混凝土抗压强度、耐久性能优异,56d抗压强度48.9MPa、电通量374C、抗盐冻性170g/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。
Calcium Sulphoaluminate Calcium Carbonate Double Expansion Source Expansion Agent HCSA has the advantages of large expansion capacity, dehumidifying expansion, and the coordinated development of expansion and strength. In view of the closed environment characteristics of CRTS Ⅲ track plate, HCSA expansive agent is used to prepare self-compacting concrete for track plate filling, which effectively solves the problems of large shrinkage, poor volume stability and easy cracking of self-compacting concrete. The fresh self-compacting concrete has good fluidity, filling and anti-segregation properties with a slump expansion of 680 mm, a L-shaped instrument filling ratio of 0.92 and a J-ring barrier height difference of 14 mm. The compressive strength and durability of the hardened concrete are excellent, the compressive strength at 56d 48.9MPa, electric flux 374C, salt-resistant 170g / m ~ 2 and dry shrinkage 291 × 10 ~ (-6). After uncovering, self-compacting concrete surface is dense, smooth and crack-free, and the performance meets the requirements of TJ / GW 112-2013.