Application Research on Shotcrete Super Early Strength Material in High Altitude Geological Complex Area
The nano-early strength functional material,enhanced alkali-free accelerator and concrete steady-state plasticizer were organically combined to develop the ultra-early strength material of shotcrete in high-altitude geological complex areas,so as to solve the contradiction between ultra-early strength performance and working performance maintenance and long-term strength growth of shotcrete in high-altitude geological complex areas.The effects of water-binder ratio,water reducing agent content,nano-early strength functional material,enhanced alkali-free accelerator and concrete steady-state plasticizer on the working performance and compressive strength of shotcrete were studied.The mechanism of super-early strength performance and workability retention was explored by hydration heat and hydration product morphology test,and the engineering application evaluation was carried out in a project.The results showed that the compressive strength of 8h,24h and 28d respectively reached 11.9,25.6,53.3MPa.
concretesuper early strength materialacceleratorcompressive strengthapplication research
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