Cementitious product

• US 4,353,748 A
• Filed: 06/13/1980
• Issued: 10/12/1982
• Est. Priority Date: 06/26/1979
• Status: Expired due to Term

• Current Assignee: Imperial Chemical Industries Limited (Nouryon BV)
• Original Assignee: Imperial Chemical Industries Limited (Nouryon BV)
• Inventors: Kendall, Kevin, Birchall, James D., Howard, Anthony J.
• Primary Examiner(s): Poer, James
• Application Number:
  US06/159,283
• Time in Patent Office: 851 Days
• Field of Search: 106/89, 106/97, 106/98, 106/99, 106/104, 106/110
• US Class Current: 106/696
• CPC Class Codes: C04B 2111/00301 Non-porous materials, e.g. macro-defect free [MDF] products
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 38/0051 characterised by the pore size, pore shape or kind of porosity
• CPC Class Codes: C04B 40/005 High shear mixing; Obtaining macro-defect free materials

Abstract

A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water not more than 2% of the total volume of the product comprising pores of maximum dimension exceeding 100 microns and preferably not more than 2% of the total volume comprising pores exceeding 15 microns in maximum dimension, the product preferably having a flexural strength of at least 40 MPa.

Claims

1. A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water not more than 2% of the total volume of the product comprising pores of maximum dimension exceeding 100 microns.

2. A cementitious product as claimed in claim 1 in which not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 50 microns.

3. A cementitious product as claimed in claim 1 in which not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns.

5. A cementitious product as claimed in claim 1 or 4 in which not more than 0.5% of the total volume of the product comprises pores of maximum dimension exceeding 100 microns.

6. A cementitious product as claimed in claim 5 in which not more than 0.5% of the total volume of the product comprises pores having a maximum dimension exceeding 50 microns.

7. A cementitious product as claimed in claim 6 in which not more than 0.5% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns.

8. A cementitious product as claimed in claim 1 in which the total volume of pores in the product expressed as a proportion of the total volume of the product, including pores, does not exceed 20%.

9. A cementitious product as claimed in claim 8 in which the total volume of pores in the product expressed as a proportion of the total volume of the product, including pores, does not exceed 10%.

10. A cementitious product as claimed in claim 1 in which not more than 5% of the total volume of the product comprises pores having dimensions in the range 2 to 15 microns.

11. A cementitious product as claimed in claim 1 in which the hydraulic cement is a silicate cement.

12. A cementitious product as claimed in claim 1 in which the hydraulic cement is an aluminate cement.

13. A cementitious product as claimed in claim 1 in which the hydraulic cement is a calcium sulphate hemihydrate cement.

14. A cementitious product as claimed in claim 1 having a flexural strength of at least 40 MPa.

15. A cementitious product as claimed in claim 14 having a flexural strength of at least 50 MPa.

4. A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water wherein not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns, the cementitious product having a flexural strength of at least 40 MPa.