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- 저자 : F. Pacheco-Torgal (검색결과 1 건)
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Shrinkage performance of fly ash alkali-activated cement based binder mortars
M. Kheradmand,Z. Abdollahnejad,F. Pacheco-Torgal 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
Some authors reported that Alkali-activated Cement Based Binder (AACB) mortars can have much higher drying shrinkage thanPortland cement based composites. Its worth remember that shrinkage performance is a very important property for reinforcedconcrete composites just because a high shrinkage performance is associated to cracking tendency that leads to future durabilityproblems. Usually shrinkage is assessed under unrestrained conditions. However, the use of a restrained ellipse ring test is especiallyinteresting for materials that will be used in restrained conditions like repair mortars. This paper provides results on restrained andunrestrained shrinkage performance of fly ash AACB mortars. The restrained shrinkage was assessed with an elliptical ring thatprovides a faster and more reliable assessment of the cracking potential than circular rings. The results show that the mixtures withlower sodium silicate content are associated to a lower unrestrained shrinkage. Mixtures with lower sodium silicate content showedreduced average crack width under restrained conditions. The results also show that the reduction of sodium silicate content delaysthe appearance of cracks and is also associated to lower crack width. The use of AACB mortars in restrained conditions requires theuse of a reduced sodium silicate content or else the use of fibres to prevent crack appearance.
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