01373636

Component

https://doi.org/10.3141/2290-18

http://scholar.google.com...eiss&publication_year=2012

High-volume fly ash (HVFA) concretes are attractive not only because they reduce cement content and the associated greenhouse gases, but also because they avoid landfilling excessive quantities of fly ash. These sustainability benefits are often tempered by practical constructability limitations that may exist for HVFA concretes: retardation and diminution of the early-age reaction, delay in setting (and finishing operations), and lower early-age strength. This paper explores the alleviation of these deficiencies in HVFA mixtures by the incorporation of fine limestone powders into ternary blends. Isothermal calorimetry and Vicat needle penetration measurements are employed to assess reaction rates and setting times, respectively. A systematic variation of the content and fineness of the limestone powder in mixtures containing either a Class C or a Class F fly ash indicates that setting times are linearly correlated with the surface area supplied by the limestone. Comparison of a limestone system to a system containing an inert titanium dioxide of similar particle size indicates that the acceleration and amplification effects of the limestone can be attributed to both physical (nucleation) and chemical (additional calcium ions) processes. The results indicate that ternary blends with 40% of the cement by volume replaced by 30% to 35% fly ash and 5% to 10% limestone at a constant water volume fraction can be achieved without significant delay in setting.

01455586

12-0660

English

pp 139–146

2012

Transportation Research Record: Journal of the Transportation Research Board

9780309223300

Print

Figures; References; Tables

Cement content; Concrete; Fly ash; Greenhouse gases; Limestone; Powders; Setting (Concrete); Sustainable development

Ternary blend concrete

Environment; Highways; Materials; I15: Environment; I32: Concrete

TRIS, TRB, ATRI

Feb 8 2012 4:56PM

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