Fibre-reinforced cementitious product

• US 4,373,957 A
• Filed: 07/29/1981
• Issued: 02/15/1983
• Est. Priority Date: 02/14/1979
• Status: Expired due to Fees

• Current Assignee: Rockwool International A/S
• Original Assignee: Rockwool International A/S
• Inventors: Pedersen, Peder
• Primary Examiner(s): Poer, James
• Application Number:
  US06/288,120
• Time in Patent Office: 566 Days
• Field of Search: 106/93, 106/99
• US Class Current: 106/711
• CPC Class Codes: C04B 14/46 Rock wool ; Ceramic or silicate fibres C04B14/40, C04B14/42 take precedence
• CPC Class Codes: C04B 18/248 from specific plants, e.g. hemp fibres
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: D21H 13/38 siliceous
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A fibre-reinforced cementitious product comprising a cementitious matrix reinforced with a combination of hemp fibres and mineral fibres, the combination of fibres constituting from 3 to 13% by weight of the cementitious product.

Claims

1. A fibre-reinforced cementitious product comprising a matrix of cementitious material and 3 to 13% by weight, based on the total weight of the cementitious product, of a fibrous material comprising a mixture of rock wool fibers and a sufficient amount of hemp fibers to provide a final product having an average minimum bending strength of 176±

17 kg/cm² at 1.7 g/cm³.

2. A cementitious product as set forth in claim 1 wherein the weight ratio of hemp fibers to rock wool fibers in said fibrous material is about 1:

1.

3. A cementitious product as set forth in claim 1 wherein the amount of said fibrous material is about 10% by weight.

4. A cementitious product as set forth in claim 1 wherein said rock wool fibers are present in an amount of at least 5% by weight based on the total weight of the product.

5. A cementitious product as set forth in claim 1 wherein said hemp fibers are present in an amount of from 1% to 7% by weight based on the total weight of the product.

6. A cementitious product as set forth in claim 1 wherein said fibrous material also includes a second type of natural organic fiber.

7. A cementitious product as set forth in claim 1 wherein said fibrous material also includes eucalyptus fibers.