Construction engineering pozzolan particle size specific surface
R. Walker and S. Pavía , EFFECT OF POZZOLAN PROPERTIES ON THE PROPERTIES OF BUILDING COMPOSITES, BCRI Bridge Infrastructure Concrete Research, University College Cork, Ní Nualláin, Walsh, West, Cannon, Caprani, McCabe, 2010
Pozzolans were used by ancient civilizations to enhance the properties of mortars and
concrete and are now regaining popularity as sustainable, environmentally-friendly
alternatives to cement. This paper studies the relationships amongst some properties
of nine pozzolans and their impact on compressive strength and setting time of the
resultant composites. Its objective is to assist in making informed choices in the
selection of pozzolans for the production of mortars and concrete. Results indicate
that each pozzolan has a specific water demand that increases with its specific surface
area; and that a high water demand by the pozzolan slows down the setting of the
paste but does not undermine the strength of the composite. It was also found that
specific surface has a much greater influence on the water demand of the paste than
particle size or lime:pozzolan ratio. The results exposed the adverse effect of a small
water increase on setting time, and the lack of relationship between setting and
reactivity. It was evidenced that the pozzolans accelerate the final set of lime by at
least 40%, and that the specific surface area of the pozzolan and its amorphousness are
the most important variables affecting reactivity and strength. Strength development
and reactivity results allowed determining the most reactive pozzolans.
Please note: There is a known bug in some browsers that causes an
error when a user tries to view large pdf file within the browser window.
If you receive the message "The file is damaged and could not be
repaired", please try one of the solutions linked below based on the
browser you are using.
Items in TARA are protected by copyright, with all rights reserved, unless otherwise indicated.