Cj. Shi et Rl. Day, CHEMICAL ACTIVATION OF BLENDED CEMENTS MADE WITH LIME AND NATURAL POZZOLANS, Cement and concrete research, 23(6), 1993, pp. 1389-1396
Citations number
10
Categorie Soggetti
Construcion & Building Technology","Material Science
This paper deals with the chemical activation of lime-pozzolan cement
(LPC), which consists of 80% natural pozzolan and 20% hydrated lime (b
y mass). Results show that the addition of 4% Na2SO4 can significantly
improve the early strength of this cement. The presence of 4% flake c
alcium chloride (CaCl2.2H2O) is not helpful to early strength, but can
increase the later strength substantially. CaSO4.0.5H2O and NaCl do n
ot demonstrate an obvious effect on the strength development of the ce
ment. Combination of activators, such as CaCl2.2H2O + Na2SO4 or Na2SO4
+ NaCl does not improve the activation effect; pastes with 2% Na2SO4
+ 2% NaCl show lower strength than the pastes with 2% Na2SO4 alone.