If we use polypropylene staple fiber in the construction industry, then the shrinkage of concrete cracks will be a good help, but also to avoid cracks in mortar.
如果我们将聚丙烯短纤维应用在建筑行业当中的话，那么混凝土裂缝的收缩性会得到良好的帮助，而且还可以避免砂浆出现裂缝问题。
So, how to find out the shrinkage reasons of merchandise concrete and control shrinkage cracks still to be solved problem.
如何找出混凝土的收缩机理，从而更好的控制收缩裂缝，是有待解决的问题。
In the east section, the hazards are mainly ground subsidence, ground cracks and expansion and shrinkage of expanded soils.
东区段主要的地质灾害是地面沉降、地裂缝和膨胀土的胀缩灾害。
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