AERATED FIBER CEMENT BUILDING PRODUCTS AND METHODS OF MAKING THE SAME

摘要

Disclosed herein are low density fiber cement articles, such as fiber cement building panels and sheets, comprised of multiple overlaying fiber cement substrate layers having small and uniform entrained air pockets and low density fillers distributed throughout. The combination of entrained air pockets and low density fillers provide a low density fiber cement matrix with physical and mechanical properties similar to comparable low density fiber cement matrix without entrained air pockets.

主权项

1. A fiber cement formulation, comprising:
less than 50% by weight of a siliceous aggregate; about 25%-38% by weight a hydraulic binding agent; about 5%-15% by weight of cellulose fibers; about 1.5%-3.5% by weight of microspheres; about 3%-8% by weight of expanded perlite; and about 0.1%-0.5% by weight of an air entrainment agent.