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Title: Compressive strength of concrete and mortar containing fly ash

The present invention relates to concrete, mortar and other hardenable mixtures comprising cement and fly ash for use in construction. The invention includes a method for predicting the compressive strength of such a hardenable mixture, which is very important for planning a project. The invention also relates to hardenable mixtures comprising cement and fly ash which can achieve greater compressive strength than hardenable mixtures containing only concrete over the time period relevant for construction. In a specific embodiment, a formula is provided that accurately predicts compressive strength of concrete containing fly ash out to 180 days. In other specific examples, concrete and mortar containing about 15% to 25% fly ash as a replacement for cement, which are capable of meeting design specifications required for building and highway construction, are provided. Such materials can thus significantly reduce construction costs. 33 figs.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
504939
Assignee:
New Jersey Inst. of Tech., Newark, NJ (United States) PTO; SCA: 360603; 010800; PA: EDB-97:099022; SN: 97001815613
Patent Number(s):
US 5,624,491/A/
Application Number:
PAN: 8-246,875
Contract Number:
FG22-90PC90299
Resource Relation:
Other Information: PBD: 29 Apr 1997
Research Org:
New Jersey Institute of Technology
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 01 COAL, LIGNITE, AND PEAT; CONCRETES; MORTARS; COMPRESSION STRENGTH; WASTE PRODUCT UTILIZATION; FLY ASH; BUILDING MATERIALS; FORECASTING; PREDICTION EQUATIONS