| 摘要 |
In reinforced concrete components of high-strength concretes, explosive flaking occurs when stressed in a fire. This can be prevented by providing the concrete of such components with a capillary system, whose substantially linear capillaries have a diameter of at least 3 mu m and a length of at least 5 mm. This capillary pore system can be formed, without impairing the other desired properties of the concrete or mortar, during or after the setting of the concrete or even only under the conditions of the fire stress. This is achieved by means of fibres which form the capillaries by dissolution, softening, shrinkage, decomposition or melting and correspond to the desired capillaries with respect to diameter and length as well as the quantity introduced. Supports produced from such fibre concrete, if appropriate with addition of finely disperse silica, can be classified in fire resistance class F 180-A. |
