摘要
本文在分析总结国内外适用平板法研究混凝土塑性收缩开裂的基础上,采用我国新《混凝土结构耐久性设计与施工指南》方法,研究了掺聚丙烯纤维高性能混凝土塑性收缩,结果表明掺0 9%(重量比)聚丙烯纤维能有效抑制裂缝的产生和扩展,显著提高高性能混凝土抵抗塑性收缩的能力。研究结果还表明我国新《混凝土结构耐久性设计与施工指南》推荐的方法能对混凝土在不同厚度平面上提供足够的约束力,有效放大开裂现象,便于比较和观察,是一种较为实用和操作性较强的平板试验方法。
It investigates the early-age plastic shrinkage and cracking of polypropylene fiber reinforced high performance concrete with the study of concrete slab test of plastic shrinkae and cracking reported recently and the suggesting test design of new Manual for Concrete Structure Endurance Design and Construction of China.The experiment demonstrates the proper weight fraction of polypropylene fiber is 09% and the fibers at this weight fraction help concrete restrain the initation and development of cracks.Polypropylene fiber improves restraint of plastic shrinkage of high performance concrete.The experiment also shows the sugesting test design of new manual is applicable to provide concrete restraint stress against plastic shrinkage at directions of thickness and zoom out the size of cracking which makes observation and comparison easier.In a word,the suggesting slab test is convenient and easy to apply and handle.
出处
《混凝土》
CAS
CSCD
2003年第12期33-36,共4页
Concrete
关键词
高性能混凝土
塑性收缩开裂
平板
high performance concrete
plastic shrinkage and cracking
slab test
