Heat treatment in the control of the setting of cement

US5624492A · kind A · utility

Assignee

• The United States of America as represented by the Secretary of the Army · US

Inventors

• Jerry P. Burkes · Vicksburg, US
• Clifford E Grey · Vicksburg, US
• Philip G. Malone · Vicksburg, US
• Toy S. Poole · Vicksburg, US
• Charles Weiss · Clinton, US

Key dates

• Filing date: Aug 23, 1995
• Grant date: Apr 29, 1997
• Expiry date: Aug 23, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B7/522
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Portland cement particles having the characteristics of slow hardening is oduced by a process of heat treating portland cement particles in the temperature range from 1500.degree. to 3000.degree. C. for from 0.5 to 10 seconds and cooling to obtain particles containing an amorphous, glassy shell as an outside layer.