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过去几十年来,混凝土的生产和浇灌方法有了很大的变化.对混凝土的质量控制提出了新问题,即估计混凝土强度的时间问题。用标准方法测定混凝土强度要在28天后方可取得结果。如何把估计混凝土强度的时间,由28天减少到1～2天内,已成为亟待解决的问题。目前,国外在快速估计混凝土强度方面已进行了广泛的探索和研究,并取得了一定的成果。众所周知,混凝土的强度随着时间的增加而增长,而强度的增长除与养护时间有关外,还受其他一些因素的影响,其中主要是养护温度。国外很多混凝土研究人员对混凝土强度与养护时间及养护温
In the past decades, the production and pouring methods of concrete have undergone great changes. New problems have been raised in the quality control of concrete, namely, the time for estimating the strength of concrete. The strength of the concrete should be determined after 28 days using standard methods. How to reduce the time for estimating concrete strength from 28 days to 1 to 2 days has become an urgent problem to be solved. At present, foreign countries have conducted extensive exploration and research in rapidly estimating concrete strength, and have achieved certain results. As we all know, the strength of concrete increases with time, and the increase in strength is related to the curing time, but also affected by other factors, including the maintenance temperature. Many foreign concrete researchers on concrete strength and curing time and curing temperature