Patent ID: 6478867
Filing Date: 2002-11-12
Classification: C04B

Abstract:
A concrete comprising:a hardened cementitious matrix including (a) cement; (b) aggregate particles having a maximum particle size Dmax of at most 2 mm; (c) pozzolanic-reaction particles having an elementary particle size of at most 1 &mgr;m; (d) constituents capable of improving the toughness of the matrix selected from the group consisting of acicular and flaky particles, wherein the particles have an average size of at most 1 mm and which are present in a proportion by volume of between 2.5 and 35% of the combined volume of the aggregate particles (b) and of the pozzolanic-reaction particles (c); and (e) at least one dispersing agent; (f) metal fibers dispersed in the hardened cementitious matrix, wherein (i) the fibers have an individual length 1 of at least 2 mm and an 1/d ratio of at least 20, d being the diameter of the fibers, (ii) the ratio R of the average length L of the fibers to the maximum particle size Dmax of the aggregate particles is at least 10 and (iii) the amount of fibers is such that their volume is less than 4% of the volume of the concrete after it has set; and (g) water, wherein the percentage by weight of water W with respect to the combined weight of the cement (a) and of the particles (c) is in the range 8-24%.