Effect of a New Type Antifreeze Agent on the Mechanical Behavior of Negative Temperature Concrete

This paper mainly studies workability and strength development law after curing in standard condition of concrete with LNC-53, which is cast at different negative temperatures (-5°C, -10°C, -15°C, -20°C). The results show that workability of pumped concrete is excellent at the negative temperature, and the slump only reduced 5mm~20mm and the slump flow reduced 10mm~30mm after mixing 1h. By appropriate early curing, the strength of concrete at -7+28d is higher than that at 28d in standard condition. At the temperature of 0~-15°C, the strength of concrete at -90d is 80~100% of that after curing 28d in standard condition, while at the temperature of -15~-20°C, the strength of concrete at -90d could be 70~80% of that after curing 28d in standard condition.