US 2025/0270141 A1 · ULTRA-HIGH-PERFORMANCE CONCRETE PRODUCED USING OFF SPECIFICATION FLY ASH

Abstract

The present invention relates to the manufacture and use of off-specification fly ash (OSFA), which would have otherwise been landfilled, in preparing ultra-high-performance concrete (UHPC). The present invention aims to provide a new avenue for valorization of OSFA in the concrete industry by utilizing high-volume OSFA in producing UHPC. Compared with conventional concrete and high-performance concrete, UHPC is a family of advanced concrete featuring exceptional compressive strength, ductility, and long-term durability. Application in UHPC is expected to be a new and feasible technology to efficiently recycle OSFA.

Claims39

Dependent claims

A method for making concrete, comprising the steps of:

providing a composition which includes cement and slag;
adding off-specification fly ash to said composition;
introducing a high-range water reducer and water mixture to said composition;
supplying said composition to a mixer;
and
continuously mixing said composition in said mixer.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/855,240Filed 11 Apr 2023

Priority

11 Apr 2022

Published

28 Aug 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

C04B 28/04
Containing hydraulic cements other than calcium sulfates: portland cements
C04B 14/06
Silica-rich materials; Silicates: quartz; Sand
C04B 14/48
Fibrous materials; Whiskers: metal
C04B 16/0641
From polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds: polyvinylalcohols; Polyvinylacetates

Ultra-high-performance concrete produced using off specification fly ash

Life of this patent

Ultra-high-performance concrete produced using off specification fly ash

Life of this patent

Abstract

Claims39