Abstract:
This invention relates to a formulation with the addition of low density additives of volcanic ash, hollow ceramic microspheres or a combination of microspheres and volcanic ash or other low density additives into cementitious cellulose fiber reinforced building materials. This formulation is advantageously lightweight or low density compared as compared to current fiber cement products without the increased moisture expansion and freeze-thaw degradation usually associated with the addition of lightweight inorganic materials to fiber cement mixes. The low density additives also give the material improved thermal dimensional stability.
Abstract:
A process for binding porous-rock particles with cement, wherein the rock is saturated in water prior to mixing with the cement. The saturation step causes water to fill the voids in the porous structure of the rock such that, during mixing of the wet rock with cement, cement particles adhere to the surface of the rock but are mostly precluded from reaching void spaces in the rock. As a result of this procedure, the interstitial water is available from within the rock for the cement hydration process, thereby providing a more uniform curing step than otherwise available, and a greater proportion of the cement is appropriately placed on the outer surface of the particles for bonding. The resulting aggregate is stronger than obtained by conventional mixing processes. In addition, because of the voids left in the composite after the cement has cured and the interstitial water has been either used by the hydration process or has evaporated, the material also exhibits improved insulating properties.
Abstract:
A constructional finished wallboard is formed of a mixture including 50 to 65 wt. % of dried shirasu, 30 to 40 wt. % of a plaster component, 3 to 10 wt. % of a clay component, 5 to 10 wt. % of shirasu balloons, 0.8 to 2 wt. % of a bond reinforcing component, 0.01 to 3 wt. % of a color pigment, and 1 to 5 wt. % of fibers for plaster. In preparing the wallboard, after preparing the mixture, an appropriate amount of water is added to the mixture to mix together, which is applied onto a substrate. Then, the surface of the mixture on the substrate is finished, followed by drying to thereby form the constructional finished board.