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Heat Resistant Concrete Durability Technology
CeraTech's FireROK™ heat resistant cement produces an extremely dense concrete with high thermal diffusivity rates that enable it to withstand high intermittent thermal loading. Spherical cement particle shapes reduce yield stress and viscosity during mixing and allow for low water to cement (w/c) ratio mix designs (0.18 - 0.22) These attributes, combined with a unique cement chemistry that lacks calcium hydrates & hydroxides, produces a durable concrete with the characteristics to endure high temperature environments.
Free calcium hydroxide in portland cement concrete loses its bound water at approximately 400 - 500 °C (750 - 930 °F) leaving calcium oxide (Fig. A). When this calcium oxide is re-exposed to moisture it re-hydrates and expands, compromising the structural integrity and durability of concrete. (Fig. B)
When portland cement concrete is exposed to a rapid rise in temperature, free water within the concrete will convert to steam and cause surface spalling. FireROK™ cement concrete requires less than half as much mix water as portland concrete, additionally, this mix water is consumed in the hydration process leaving no available free water to facilitate the steam spalling process.
Because portland cement concrete is less conductive than FireROK™, resultant thermal gradients cause differing degrees of expansion which then impart destructive tensile forces to concrete matrix.
FireROK™ Heat Resistant
CeraTech's FireROK™ cement concrete conducts heat 5 times faster than ordinary portland cement concrete, making it far less susceptible to cracking and spalling due to thermal stresses.