Abstract: With the demand of the engineering project and the development of the technology, concretes have been developed to get the high strength, high durability, and high mobility with physical volume stability. However because of the initial weakness of concrete, especially when strength is high, cracks will easily be developed because of its brittleness, which is the main reason resulting in many project prohlems.Putting the organism fiber into concrete can lower concrete' s brittleness, control the shrinkage defornation of concrete, increase concrete' s perfonnance of preventing crack, and improve the whole perfonnances of the high performance concrete.

Key words: organic fiber, crack resistance, shrinkage

摘要： 伴随着工程建设的需要和科技的发展，现代砼正向高强度、高耐久性、高流动性和高体积稳定性发展．但是， 砼的固有弱点即自身脆性大，特别是当强度较高时更容易出现由于其脆性而产生裂缝的情况，这也是引起许多工 程问题的主要原因．本文在理论分析的基础上结合室内实验，得出在砼中加入有机纤维，可有效降低砼脆性，约束 砼的收缩变形，提高砼的抗裂阻裂性能的结论．

关键词: 有机纤维, 抗裂性, 收缩