现代的工业建筑中广泛地使用大体积,低标号的混凝土制品,其中也包括石膏混凝土制品。由于这种制品的收缩变形不均匀,因此产生很大的内应力,这就是微小裂缝形成的原因。将聚丙烯短纤维做填料,掺入石膏火山灰质混凝土中,其收缩变形就能减小。弹性聚丙烯纤维还能限制已形成裂缝的发展,使裂缝的端部紧缩,能承受破损应力。在研究工作中。我们使用了园形截面(d=0.065～0.25mm)的纤维和与混凝土粘结力很强的 Large volume, low-grade concrete products, including gypsum concrete products, are widely used in modern industrial buildings. Since the shrinkage and deformation of this product is not uniform, a large internal stress is generated, which is the reason for the formation of micro-cracks. Polypropylene short fibers are used as fillers and incorporated into gypsum pozzolanic concrete, and the shrinkage deformation can be reduced. Elastic polypropylene fibers also limit the development of cracks that have formed, allowing the cracks to shrink at their ends and withstand breakage stresses. In research work. We use fibers with a circular cross section (d=0.065-0.25mm) and strong adhesion to concrete.