Utilization of organic fibers, ultra high performance concrete, preparation process and composition

摘要

"USE OF ORGANIC FIBERS, ULTRA HIGH PERFORMANCE CONCRETE, PREPARATION PROCESS, AND COMPOSITION". Use of organic fibers having a melt treatment of less than 300 198 C, an average length of 1 greater than 1 mm and a diameter of up to 200 109 m in ultra high performance concrete to improve fire resistance of concrete, the amount of organic fibers being such that their volume is between 0.1 and 3% of the volume of concrete after setting and the concrete having a 28-day compressive strength of at least 120 MPa , a flexural strength of at least 20 MPa, and an unhardened spreading value of at least 150 mm, these values being given for preserved concrete kept at 20 198 C, said concrete consisting of a particular hardened cement matrix in which the metal fibers are dispersed.