James Hardie Technology Limited

Jongmin Keum

Weiling Peng

Thinh Pham

Huagang Zhang

Yongjun Chen

Thomas Patrick Mueller

Xiangyuan Liu

Shan Ren

Lijun Mao

Bhavin Mehta

Farshad J Motamedi

Eoin Battles

Yan Li

A fiber cement material formulation comprising a cementitious binder, a siliceous material, fiber, alumina trihydrate and a bifunctional low density additive wherein the bifunctional low density additive comprises any one or more of diatomaceous earth, recycled autoclave fiber cement dust or cellulose dust. The fiber cement material formulation optionally further comprises a secondary low density additive which may be perlite. In some embodiments, a fiber cement article manufactured from the fiber cement material formulation comprises a density of approximately 1.1 g/cmor below.

Fiber cement material formulations and compositions thereof

Embodiments of the present disclosure are directed to a low density monolithic fiber cement article that incorporates controlled air entrainment evenly distributed throughout the article to improve various physical properties of the article. In some implementations, air entrainment agents are used to create voids in the article, thereby lowering the density and weight of the boards while maintaining adequate strength. In some implementations, the air entrainment agents can be added in solution to create a foam, or can be used to generate a pre-foam, which can be added to a cementitious paste. The cementitious paste incorporating the air entrainment agent can proceed through an extrusion process, experiencing high pressures, where the voids remain in the final monolithic fiber cement board.

Lightweight extruded cementitious material and method of making the same

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Rancho Cucamonga, CA, United States of America

Jongmin Keum