Synthetic aggregate from waste materials

US10207954B2 · kind B2 · utility

Assignee

• Nano and Advanced Materials Institute Limited · CN

Inventors

• Yan Gao · 流花街道, CN
• Honggang Zhu · Sha Tin, CN
• Yifei Yan · Sha Tin, CN
• Bo Li · San Jose, US
• Man Lung Sham · Sha Tin, CN
• Tung-Chai Ling · Hunan, CN

Key dates

• Filing date: Dec 22, 2016
• Grant date: Feb 19, 2019
• Expiry date: Feb 17, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/91
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Synthetic aggregates are fabricated from greater than approximately 70 wt % waste starting materials. Starting materials may be selected from granulated ground blast furnace slag, waste concrete fines, or sewage sludge ash, and mixtures thereof. The starting materials are bound together by a hydraulic cementitious binder either added to the starting materials or formed in situ. The waste starting materials, binder, and water are formed into pellets and subjected to a hydraulic reaction and carbonation in an atmosphere of greater than approximately 50% carbon dioxide at temperatures less than approximately 100° C. The resulting synthetic aggregate has a crush strength after a period of hardening equal to or greater than approximately 0.5 MPa.