Cellular concrete
AssigneeConcrete Technology Corporation
InventorStewart C. Spinney
Life of this patent
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Abstract
A more economical, stable, non-shrinking cellular concrete is provided by the addition of cementitious or non-cementitious fines to a cellular concrete mix. The improved cellular concrete is attained by reducing the amount of cement and replacing it with an equal amount of cementitious or non-cementitious fines. The partial replacement of the more expensive cement for the less expensive fines results in a more economical choice of cellular concrete suitable for use in structural applications, for insulation purposes, and for use in producing lightweight aggregate.
Claims36
A cellular concrete mix for the preparation of cellular concrete aggregate comprising:
- (a) cement;
- (b) water;
- (c) an additive comprising a colloidal solution or sol-gel composition selected from the group consisting of suspensions of water-sodium bentonite, water-peptized calcium bentonite, water-attapulgite and a gelled silica based sol-gel;
- (d) fines;
- and
- (e) a stable small-celled foam composition comprising a foam-making agent,
- the water being present in an amount to hydrate the cement and sustain the foam, the fines being present in an amount between about 10% and 70% of the combined weight of fines and cement, and the additive being present in an amount sufficient to substantially eliminate setting-shrinkage of the cellular concrete and prevent cell coalescing.
A cellular concrete aggregate produced by the process comprising substantially uniformly mixing together:
- (a) cement;
- (b) water;
- (c) an additive comprising a colloidal solution or sol-gel composition selected from the group consisting of suspensions of water-sodium bentonite, water peptized calcium bentonite, water attapulgite and a gelled silica based sol-gel;
- (d) fines;
- and uniformly mixing therewith:
- (e) a stable small-celled foam composition comprising a foam-making agent,
- the water being present in an amount to hydrate the cement and sustain the foam, the fines being present in an amount of between about 10% and 70% by weight of the combined weight of fines and cement, and the additive being present in an amount sufficient to substantially eliminate setting-shrinkage of the cellular concrete and prevent cell coalescing, to form a cellular cement mix and thereafter permitting cellular cement mix to set forming a cellular concrete substantially free of setting-shrinkage and loss of cell integrity due to coalescing of cells.
A cellular concrete mix for the preparation of cellular concrete aggregate, comprising:
- (a) cement,
- (b) water,
- (c) an additive comprising a gelled silica based sol-gel of silica-calcium chloride,
- (d) fines;
- and
- (e) a stable small-celled foam composition comprising a foam-making agent,
- the water being present in an amount to hydrate the cement and sustain the foam, the fines being present in an amount of between about 10% and 70% by weight of the combined weight of fines and cement, and the additive being present in an amount sufficient to substantially eliminate setting-shrinkage of the cellular concrete and prevent cell coalescing.
Dependencies are inferred from the claim text.