2017 Volume 71 Issue 1 Pages 587-594
It was clarified that blast furnace slag（BFS）sand decrease different pore structure from BFS powder. Using BFS powder, pore which diameter is under 400nm was decreased in cement paste. Using BFS sand, pore which diameter is not only under 400nm but also over 400nm were decreased in cement paste and around sand（interfacial transition zone：ITZ）. A high correlation was confirmed between volume of pore which diameter is over 10nm and coefficient of air permeability. The decrease of small pore in cement paste by BFS powder and sand makes mass loss rate lower. The reason is that denser pores in cement paste have higher ability for retaining water in their structure. A high correlation was confirmed between volume of pore which diameter is over 400nm and drying shrinkage. The decrease of ITZ by BFS sand makes quantity of drying shrinkage lower. The reason is that strengthening bind between cement paste and sand can reduce quantity of drying shrinkage. A high correlation was confirmed between volume of pore which diameter is over 400nm and coefficient of air permeability. The decrease of ITZ by BFS sand makes coefficient of air permeability lower. The reason is that closing ITZ can shut the pass which gas or liquid permeate.
