Retarding effects of fly ash upon the hydration of cement pastes: the first 24 hours

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Cem. Concr. Res.; (United States)

DOI:https://doi.org/10.1016/0008-8846(85)90024-9· OSTI ID:5474402

Fajun, W; Grutzeck, M W; Roy, D M

Disagreement exists in the literature as to whether or not fly ash accelerates or retards the early hydration of fly-ash blended cements. As an outgrowth of this controversy the effects of two fly ashes, a Class C and a Class F, their leachates and leached fly ash residues upon the first 24 hours of cement hydration were studied. It was found that both fly ashes (as received and to some degree, leached) retarded a Type I cement hydration; however the fly-ash leachates did not. The retardation phenomenon is apparently related to the presence and condition of the fly ash surfaces. 13 references.

• OSTI ID: 5474402
• Journal Information: Cem. Concr. Res.; (United States), Journal Name: Cem. Concr. Res.; (United States) Vol. 15:1; ISSN CCNRA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
ASHES
BUILDING MATERIALS
CEMENTS
CHEMICAL REACTION KINETICS
DISPERSIONS
FLY ASH
HYDRATION
KINETICS
LEACHATES
MATERIALS
MIXTURES
PORTLAND CEMENT
REACTION KINETICS
RESIDUES
SOLUTIONS
SOLVATION
SURFACE PROPERTIES
WASTE PRODUCT UTILIZATION
WASTES