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目前,在结构工程中开裂已经是相当普遍和严重的问题,而大部分的裂缝发生在早期,且对混凝土耐久性影响深远。本文应用改性聚丙烯纤维和膨胀剂双掺技术,通过砂浆、混凝土的平板试验,考察聚丙烯纤维微膨胀混凝土对控制混凝土早期变形裂缝的效果,进一步通过对其自由收缩率、限制膨胀率、力学性能等技术指标的测试,来分析控制早期裂缝的原因,以此确定北京出版发行物流中心项目超长结构墙体的最佳配合比及工艺参数,并且通过实际验证,证明是一种有效控制早期裂缝的方法之一,对控制超长结构裂缝有借鉴作用。
At present, cracking in structural engineering has been a very common and serious problem, and most of the cracks occurred in the early stage and have a far-reaching impact on the durability of concrete. In this paper, double-doped modified polypropylene fiber and expansive agent technology, mortar, concrete flat test, polypropylene fiber micro-expansive concrete to examine the effect of early deformation cracking of concrete, and further by its free shrinkage, limiting expansion rate, Mechanical properties and other technical indicators to analyze the reasons for the control of early cracks in order to determine the Beijing Publishing Logistics Center project super-long structural wall of the best mix and process parameters, and proved that it is an effective control One of the methods of early fractures is a reference to control the long structural cracks.