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在混凝土冬期施工中,当采用加热法或蓄热法工艺时,为了确定热养护时间或混凝土达到抗冻临界强度的时间,需要随时了解强度情况。在工地留置试块作抗压强度试验,固然可以解决一部分问题,但所做的试块很难与结构物保持同样的温度,因此几乎无法依靠试块来确定混凝土的实际强度;又由于模板未拆,也不能使用任何非破损方法进行测试。比较可行的办法,是对某一种已知配合比的混凝土,根据其养护过程(硬化温度—时间),来推断或预报混凝土可能达到的强度。这种方法,国外已比较习用,国内研究尚少。现将我所对此进行的研究工作及应用方法简述如下。一、成熟度规则 1951年,英国的A·G·A·Saul指出,混凝土的强度是硬化温度与龄期乘积的单叶函
In the winter construction of concrete, when the heating method or the thermal storage method is used, it is necessary to know the strength at any time in order to determine the thermal curing time or the time when the concrete reaches the critical strength for freezing. The compressive strength test of the indwelling test block on site can solve some problems, but it is difficult for the test block to maintain the same temperature as the structure, so it is almost impossible to rely on the test block to determine the actual strength of the concrete; It cannot be tested using any non-broken method. A more feasible approach is to infer or predict the strength that a concrete can reach based on the curing process (hardening temperature-time) of a concrete with a known mix ratio. This method has been more familiar abroad, domestic research is still less. Now I will briefly describe the research work and application methods I have conducted. First, maturity rules In 1951, the British A·G·A·Saul pointed out that the strength of concrete is the single-leaf volume that is the product of hardening temperature and age.