3-mode blended fibers in an engineered cementitious composite

A fiber reinforced cement composition, comprising:

• a hydraulic binder;
• aggregates;
• cellulose fibers;
• and
• polypropylene fibers, said polypropylene fibers having irregular forms,
• wherein the ratio of the percent by weight of cellulose fibers to polypropylene fibers is between 3 to 24.

A method of manufacturing a fiber reinforced cementitious article, comprising:

• forming a fiber cement slurry, said fiber cement slurry comprises a hydraulic binder, aggregate, water, cellulose fibers and polypropylene fibers, wherein the percent weight ratio between the cellulose fibers and the polypropylene fibers is between 3 to 24;
• depositing said fiber cement slurry on a plurality of sieve cylinders that are rotated through the fiber cement slurry, wherein the cellulose fibers and polypropylene fibers filter the fiber cement slurry to form a thin fiber cement film;
• transferring a series of sequential layers of the thin fiber cement films to a belt so as to build a thicker fiber cement layer;
• removing water from the thicker fiber cement layer;
• and
• curing said thicker fiber cement layer in an autoclave at a temperature of at least 150° C.