The strength of concrete increases with time. The higher the temperature, the faster the growth. On the contrary, the lower the temperature, the slower the growth. The maturity of concrete is the comprehensive influence of time and temperature on the strength growth of concrete, which can be determined by the following formula: M=t(T+ 10). Where: m concrete maturity (C.d), t concrete average curing temperature (c) and concrete curing time (d) shall be calculated from the final setting. 2 is the characteristic value a of concrete strength growth. Under the same curing temperature, the strength growth of concrete is also different. We use the characteristic value A of strength growth to express it, which means that the value A is large, the early strength is high, the value A is small, and the early strength is low, which is related to cement varieties, additives and water-cement ratio. The relationship between concrete strength growth and maturity: ft/f28=M/(A.M+B). Where: ft-the concrete strength value at a certain age, and the concrete strength value at f28-28 days: B- constant B=840( 1-A) is related to the value of A. 3 Time required for concrete to reach formwork removal strength: Maturity required for concrete to reach formwork removal strength: M=C.B/( 1-C.A). Where: the ratio of concrete formwork removal strength to concrete preparation strength specified in c- specification, if 1. 15% of the standard value is considered, then C = 22.5/(30x1.15) = 0.65. Taking a beam with a span of 8m as an example (A=0.84), the maturity required for concrete to reach the formwork removal strength should be 192, and when the span is equal to or greater than 8m, the maturity m required for concrete to reach the formwork removal strength should be 430. The curing time t required for concrete to reach the formwork removal strength can be determined according to the following formula: t=M/(T+ 10).