Fire resistant concrete

摘要

The present invention relates to improved concrete elements, particularly to high-performance self-compacting concrete (HP-SCC); to cementitious compositions suitable for producing such concrete elements; to methods of manufacturing such concrete elements and such cementitious compositions; to the use of specific additives in concrete elements and cementitious mixtures. The inventive compositions comprise an effective amount of polymer fibers and of hydrogels. The inventive concrete elements show improved fire resistance, particularly towards explosive spalling.

主权项

1. A high-performance, self-compacting cementitious mixture comprising:
(a) cement, 300 to 1000 kg/m3 of the cementitious mixture; (b) aggregate, 700 to 2000 kg/m3 of the cementitious mixture; (c) water, 40 to 400 kg/m3 of the cementitious mixture; (d) polymer fibres, 0.5 to 2 kg/m3 of the cementitious mixture; (e) superabsorbent polymer selected from the group consisting of cross-linked polyelectrolytes, 0.1-1.0% by mass of cement; (f) optionally mineral admixtures; and (g) optionally additives; wherein the ratio of (d):(e) is in the range of 0.02 to 20; and wherein the water-to-cement ratio by mass is lower than 0.4.