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长期以来,土建施工单位为了获得准确合理的混凝土配合比,大都采用预先试配的办法。即根据原材料性能,设计拌制三种不同水灰比的试块,经标准养护28天后,将试压的强度值加以调整发出配合比;或采用标准养护7天的试压强度值,估算28天的标准强度值,从而测算调整配合比。但不论是28天标准法,或是7天预测法,在很多情况下,都不能满足施工需要,往往在试配尚未得出结果时就需施工了,只得按经验配合比施工。这样做的结果.不是因原材料潜力不能
For a long time, in order to obtain accurate and reasonable concrete mix ratio, civil construction units mostly use pre-testing methods. That is, according to the properties of raw materials, three different water-cement ratio test blocks are designed to be mixed. After the standard maintenance for 28 days, the strength value of the test pressure will be adjusted to give a mix ratio; or the standard test-pressure strength value of 7 days will be used to estimate 28 The standard strength value of the day, so as to adjust the adjustment ratio. However, whether it is the 28-day standard method or the 7-day forecast method, in many cases, it can not meet the construction needs, and often the construction is required when the test results have not yet reached the results. The result of this is not because of raw material potential