Synthetic fibers and cementitious systems including same

A fiber reinforced cementitious composite comprising a hardened cementitious matrix, said matrix including staples of low orientation precursor nylon fibers being characterized by an average birefringence value greater than 0.0350, but less than 0.0440, an average modulus greater than 10 gram/denier, but less than 25 gram/denier, an average tenacity greater than 2.5 gram/denier, but less than 3.4 gram/denier, and an average elongation capacity greater than 46%, but less than 100%.

The cementitious composite 56, wherein said chemical is selected from the group consisting of a salt that undergoes acid hydrolysis, benzene phosphonic acid, a manganese salt, a hindered phenol photo stabilizer, a hindered amine photo stabilizer, a phosphorous compound for ultraviolet stabilization, a phosphorous, amino and phenolic based antioxidants and copper iodide, copper acetate, potassium iodide, potassium bromide, zinc chloride and microsilica.

A method of manufacturing a reinforced hardened cementitious composite comprising the steps of:

• (a) providing components of a cementitious matrix including a cementitious substance, water and staples of low orientation precursor nylon fibers being characterized by an average birefringence value greater than 0.0350, but less than 0.0440, an average modulus greater than 10 gram/denier, but less than 25 gram/denier, an average tenacity greater than 2.5 gram/denier, but less than 3.4 gram/denier, and an average elongation capacity greater than 46%, but less than 100%;
• (b) mixing said components until said fibers become well dispersed therein;
• and (c) hardening said matrix.

67-121. (canceled)