Hardening cement mixtures

• US 3,306,961 A
• Filed: 06/14/1965
• Issued: 02/28/1967
• Est. Priority Date: 06/14/1965
• Status: Expired due to Term

• Current Assignee: Gerald M. Spence
• Original Assignee: Gerald M. Spence
• Inventors: Spence, Gerald M.
• Application Number:
  US04/463,837
• Time in Patent Office: 624 Days
• US Class Current: 264/82
• CPC Class Codes: B28B 11/245 Curing concrete articles B28B11/242 takes precedence
• CPC Class Codes: B28B 21/48 by wrapping, e.g. winding
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: C04B 40/0028 Aspects relating to the mixing step of the mortar preparation
• CPC Class Codes: C04B 40/0089 making use of vacuum or reduced pressure
• CPC Class Codes: C04B 40/0231 Carbon dioxide hardening
• CPC Class Codes: C04B 40/0263 Hardening promoted by a rise in temperature C04B40/024 takes precedence

Claims

1. IN A PROCESS OF MANUFACTURING A PORTLAND CEMENT PRODUCT IN WHICH A LAYER OF A PORTLAND CEMENT MIXTURE CONTAINING WATER IS LOCATED UPON A SUPPORTING SURFACE AND IS TRANSFERRED FROM SAID SUPPORTING SURFACE TO A FORM HAVING A SHAPE CORRESPONDING TO THE SHAPE OF SAID PRODUCT, THE IMPROVEMENT WHICH COMPRISES:

APPLYING HOT GASEOUS PRODUCTS RESULTING FROM COMBUSTION OF CARBON-CONTAINING FUEL TO SAID MIXTURE PRIOR TO THE HYDRATION OF THE CEMENT IN SAID MIXTURE AS SAID MIXTURE IS BEING HANDLED SO AS TO BE LOCATED UPON SAID FORM.