๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

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

โœ Scribed by Wei Fajun; Michael W. Grutzeck; Della M. Roy

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
753 KB
Volume
15
Category
Article
ISSN
0008-8846

No coin nor oath required. For personal study only.

โœฆ Synopsis

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 Fj their leachates and leached fly ash residues upon the first 24 hours of cement hydration were studied.

It was found that both fly ashes (has 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.

๐Ÿ“œ SIMILAR VOLUMES

Effects of three Turkish fly ashes on th
Effects of three Turkish fly ashes on the heat of hydration of PC-FA pastes
โœ Mustafa Tokyay ๐Ÿ“‚ Article ๐Ÿ“… 1988 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 214 KB

Effects of the type and amount of fly ash substitution on the heat of hydration of portland cement-fly ash pastes were investigated. Three Turkish fly ashes were used. One of them was a high-calcium and the other two were low-calcium fly ashes. The specimens contained 0, I0, 20, and 40% fly ash by w

Pore structure characteristics affecting
Pore structure characteristics affecting the permeability of cement paste containing fly ash
โœ B.K. Marsh; R.L. Day; D.G. Bonner ๐Ÿ“‚ Article ๐Ÿ“… 1985 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 523 KB

Results are presented ~rom measurements o{ the permeability o~ saturated, hardened cement pastes, with and without fly ash.Specimens tested were cured over a temperature range from 20 to 65ยฐC for periods from seven days to one year. The results show that a dramatic reduction in permeability occurs d