混凝土强度质量水平很难评价。因为目前我们国家还没有一个衡量混凝土强度质量水平的统一方法、规定和标准。而我局各单位在统计和控制混凝土强度质量水平的资料中,以全部达到设计标号为统计依据,即指按照28天龄期,用标准试验方法所得的抗压极限强度等于或大于设计强度为合格。用这样的方法,所得的年度统计资料中,有许多数字并不正确。因为在统计数中,合格与不 The level of concrete strength is difficult to evaluate. Because at present our country does not have a unified method, regulations and standards for measuring the quality level of concrete. The data of all units in the Bureau of Statistics and Control on the strength and quality of concrete are statistically based on all the design markings, that is, according to the 28-day age, the ultimate compressive strength obtained with the standard test method is equal to or greater than the design strength. qualified. In this way, many of the annual statistical data obtained are not correct. Because in the statistics, qualified and not