Fiber cement board with modified fiber

Abstract

The invention discloses a fiber cement board with modified fiber. A building material product comprising a cementitious binder, an aggregate and cellulose reinforcing fibers wherein the cellulose reinforcing fibers have been treated with oil which is bound to the fiber by a retention aid. The resulting fiber when included in a fiber cement composite results in improved deflection of the compositeat peak loading as well as improved impact strength while maintaining overall board strength.

Description

technical field [0001] The present application relates to a fiber cement board incorporating modified cellulose pulp fibers. Background technique [0002] The interior structure of a house or other building is often protected from environmental elements by exterior siding materials. Typically, these wallboard materials are boards or panels of wood, concrete, brick, aluminum, stucco, wood composites, or fiber-cement composites. Some common fiber-cement composite building materials in fiber-cement wallboards, roofing and finishes are usually composed of cement, quartz sand, unbleached wood pulp and various additives. Fiber-cement products have several advantages over other types of materials such as wood siding because they are weather resistant, less expensive to manufacture, fire resistant, and less prone to corrosion or insect infestation. [0003] Most commercial fiber-reinforced cement siding products are manufactured using the Hatsheck process. The extraction method w...

AI Technical Summary

Problems solved by technology

[0009] Fiber cement boards made from bleached cellulose pulp fibers typically have high strength but are brittle, resulting in poor flexibility

These boards tend to break if bent and also tend to break when nailed

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