Organic polymer fibres such as nylon and polypropylene, when added to cement or concrete even in very small proportions, substantially improve the impact resistance of the matrix but have very little effect on its tensile or bending strength. For the latter, the addition of a second fibre such as glass, asbestos or carbon is beneficial. The strength durability of cement composites containing various combinations of organic and inorganic fibres has been assessed by measuring the bending and impact strengths of composite specimens stored under several different conditions. Tests have been carried out at selected intervals over a period of one year. The results show that it is possible to produce satisfactory composites by using a mixture of organic and inorganic fibres as reinforcements.
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