The results of an experimental research on the factors responsible to
a greater extent for the action of simulated acid precipitations on ce
ment concrete works, both in static and in dynamic conditions, are dis
cussed. The influence of the cement type, the role of calcium hydroxid
e, the influence of water-cement ratio, and the retard effect on assau
lt, owing to a surface treatment with a water repellent agent, are emp
hasized. (C) 1998 Elsevier Science Ltd.