Glass fibres and compositions containing glass fibres

摘要: Fibre reinforced cementitious products are described comprising glass fibrous material distributed throughout a cement matrix, in which the is one having per se degree of alkali resistance such that when tested form an abraded fibre length 2 1/2 inches and diameter from 0.4 to 1.0 X 10 3 said has tensile strength at least 100,000 p.s.i. after treatment with saturated aqueous Ca(OH)2 solution 100*C. for 4 hours followed by successive washings ambient temperature water, then hydrochloric acid (1%) 1 minute, acetone, following drying, experiencing not more than 10% reduction during test. The reinforcement Portland structures fibres lengths up described. Alkali resistant glasses useful production these comprise CaO-MgO-Al2O3-SiO2 including those anorthite field, silica zirconia glasses, stannic oxide glasses. have outstanding durability impact resistance.