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混凝土拌合物超过凝结时间再浇灌,这是不好的,我们应当从施工组织管理上杀取措施,尽可能避免。由于估计不到的原因,混凝土拌合物必须延长浇灌时间,以至于超过了通常挂制的2小时的界限,在这种情况下,混凝土拌合物是不是非报废不行呢?七冶和八冶的同志在这方面做了些试验,认为混凝土拌合物延浇时间超过2小时(4小时以内),只要杀取适当措施,加强振捣,或在加强振捣的同时补加一部分水泥浆,可以照常使用,不影响浇灌质量。我们建议各单位的中心试验室都做一做这个试验,把这个问题在自己单位落实下来。
The concrete mixture exceeds the setting time before it is poured. This is not good. We should take measures from the construction organization management and avoid it as much as possible. Because of the unpredictable reason, the concrete mix must be extended to the time of watering, so as to exceed the limit of the usual hanging of 2 hours. In this case, is the concrete mix not non-reportable? Comrade Smelter did some experiments in this respect and considered that the concrete mix should be poured for more than 2 hours (within 4 hours), as long as appropriate measures are taken to strengthen vibrators, or a part of the grout is added at the same time as the vibrators are strengthened. It can be used as usual without affecting the quality of watering. We recommend that all the central laboratories of the units do this test and implement this issue in their own organization.