Pe. Grattanbellew et al., EFFECT OF AGGREGATE PARTICLE-SIZE AND COMPOSITION ON EXPANSION OF MORTAR BARS DUE TO DELAYED ETTRINGITE FORMATION, Cement and concrete research, 28(8), 1998, pp. 1147-1156
Citations number
21
Categorie Soggetti
Construcion & Building Technology","Material Science
The effect of aggregate composition and particle size on the expansion
of mortar bars, due to delayed ettringite formation (DEF), was evalua
ted by heat-curing mortar bars made with basalt, dolostone, granite, l
imestone, siliceous limestone, and pure crystalline quartz. Subsequent
to heat curing, the mortar bars were subjected to 3 thermal cycles to
accelerate the formation of DEF. They were then stored in lime water
for 59 days and length change was monitored. Only mortar bars made wit
h quartz aggregate showed significant expansion. Expansion was found t
o be inversely proportional to the particle size of the quartz aggrega
te. The amount of ettringite formed in the mortar bars was shown to be
proportional to their rate of expansion. (C) 1998 Elsevier Science Lt
d