James Hardie Technology Limited

James Hardie Research Pty Limited

Kalynne H Paradis

David Leslie Melmeth

James Albert Gleeson

Brian P Sloane

Dean M Seligman

Basil Taha Naji

Xiangdong Feng

Xiangyuan Liu

Chongjun Jiang

Shannon Marie Labernik

Amitabha Kumar

Liyan Ma

Michael John Julius

David John Sharman

Meiling Gong

Chinmay Avinash Gowardhan

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.

Fiber cement building materials with low density additives

Cementitious formulations and their products with enhanced reactivity are provided. Formulations in certain embodiments may include at least one calcium source, a reactant and a filler in a hydrated environment, wherein the reactant, in one form, is crystalline silica that has been modified for reactivity. Enhancement of a reactant may include one or more modifications to its content, grind and/or the cement to silica ratio, as well as addition of one or more additives in the formulation, additives in the form of at least one alumina source, defoamer, catalyst and/or a clay.

Cementitious formulations and products

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Rancho Cucamonga, CA, United States of America

Kalynne H Paradis