一、试验依据在自应力水泥压力管的生产实践中,往往有这样的现象:有时,水泥石的强度上升得很快,而膨胀率则偏低,自应力值很小;有时,情况恰恰相反,水泥石胀得很厉害,而强度则大幅度下降。上述两种现象表现在管子上,前者是管子的承压能力降低,成批管子达不到规定的压力指标,后者则容易造成管子胀坏。产生这两种质量问题的原因是膨胀和强度不能相适应地增长。如何处理好膨胀和强度的矛盾,是提高自应力水泥压力管质量的一个重要环 First, the test basis In the production of self-stress cement pipe, there is often such a phenomenon: Sometimes, the strength of cement stone rose rapidly, while the expansion rate is low, the self-stress value is small; sometimes, the opposite is true , Cement stones swell very much, but the intensity is greatly reduced. The above two phenomena manifested in the tube, the former is reduced pressure capacity of the tube, batch of tubes fail to meet the specified pressure targets, the latter is likely to cause the tube to bulge. The reason for both of these quality problems is that expansion and strength can not grow properly. How to deal with the contradiction between expansion and strength is to improve self-stress cement pressure pipe quality is an important ring