US Government As Represented by the Secretary of the Army

Other

Toy S Poole

Philip Garcin Malone

Charles Arthur Weiss, Jr

Joe Gain Tom

William N Brabston

Clifford E Grey

Jerry P Burkes

Hector Gonzalo Cruz

The invention's first embodiment uses shape memory alloy (SMA) fibers that are blended into a concrete composite material as straight fibers and are made to deform themselves and anchor and interlock themselves after dispersement in the composite material resulting in a more evenly distributed and interlocked fiber reinforcement of the cementitious material. A self-shaping fiber can be imparted to the concrete material by making the fibers out of SMA such as nickel-titanium alloy known as nitinol where the cementitious composite material mixture is briefly heated above the 'transition' temperature prior to hardening that causes the fibers to change shape. Nitinol fibers are used alone in place of conventional steel fibers. A second embodiment uses conventional coiled metal steel fiber combined with a SMA clip for retaining the coiled metal fiber during the blending of this clipped fiber into a cementitious material with required heating yielding a shape change of the coiled metal fibers ultimately resulting in improved reinforcement characteristics.

Self-interlocking reinforcement fibers

Portland cement particles having the characteristics of slow hardening is oduced by a process of heat treating portland cement particles in the temperature range from 1500.degree. to 3000.degree. C. for from 0.5 to 10 seconds and cooling to obtain particles containing an amorphous, glassy shell as an outside layer.

Heat treatment in the control of the setting of cement

An alkali-activated silicate based cement or binder has a cure characteric which is modified by a phosphate additive which retards the set time of the cement or binder. The phosphate allows a longer set time than conventional alkali-activated silicate glass cements.

Setting control for alkali-activated silicate binders

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Vicksburg, MS, United States of America

Toy S Poole