Reinforced concrete constructional elements - using mineral fibres in all or part of the cement or mortar, in addn. to steel

摘要

A space-forming shaped part, esp. building elements of reinforced concrete, the novelty being that the cement-bonded mortar and concrete is partially or completely, i.e. uniformly throughout the cement-bonded matrix, reinforced with synthetic mineral fibres such as glass-, stone-, slag-, or carbon-fibres, impact toughness, and for improving the distribution of fissures or cracks. The fibres may be incorporated in the element as lost shuttering a pre-fabricated part, a facing mortar, or inclused in the cement or concrete mixt, pref. using fibres with adequate resistance against the alkaline media where required and/or treating the cement mixt with CO2 to reduce the alkalinity. The improved mechanical properties, including elongation, means higher permissible stresses and/or redn in size and wt of constructional elements, fire-resistance is also increased. As compared with concrete or mortar in which no fibres are used, the bending strength can be increased 3-8 times and the elongation at fracture increased up to 20 times; bending strengths up to 600 kp/cm2 are attainable and the better distribution of fissures means less environmental corrosion.