Patent ID: 6723162
Filing Date: 2004-04-20
Classification: C04B,Y02W

Abstract:
A concrete comprising a hardened cement matrix in which organic fibres are dispersed, obtained by blending with water a composition comprising besides organic fibres:(a) cement, (b) granular elements, (c) fine elements with a pozzolanic reaction, (d) at least one dispersing agent, and wherein: (1) the granular elements (b) have a maximum grain size D of 2 mm at the most, (2) the fine elements with a pozzolanic reaction (c) have a particle size of 20 &mgr;m at the most, and wherein: (3) the weight percentage of water to the added weight of cement (a) and the fine pozzolanic reaction elements (c) is in the range between 8% and 25%, (4) the organic fibres have an individual length I of at least 2 mm and a I/&PHgr; ratio of at least 20, &PHgr; being the fibre diameter, (5) the fibre amount is such that their volume represents 8% at the most of the concrete volume after setting, (6) the ratio R between the average fibre length L and the maximum grain size D of the granular elements is at least 5.