997
4384.021
Fagerlund, Goran
Frost Resistance of Concrete with Porous Aggregate
Book
Swedish Cement and Concrete Research Institute
1978
February
1-189
Y
The author’s original intention was to prepare a report on the frost resistance of lightweight aggregate concrete. This objective was soon shown to be too limited; there is actually only a difference in degree between a true lightweight aggregate and a normalweight aggregate containing a small percentage of pores. The actual report therefore covers the influence of all types of aggregates – lightweight or normalweight – on the frost resistance of concrete. The main interest is, however, concentrated towards true lightweight aggregates–natural or artificial; that is, aggregates characterized by a high porosity, the pores being very coarse in comparison with pores in the cement paste.The work has been sponsored by The Swedish Board for Technical Development (STU) through grant 74-3367. Seven other reports have been published under the same grant. Four of them (1-4) deal directly with frost resistance of concrete; one (5) treats the influence of aggregate on concrete properties in general – even frost resistance; one (6) deals with moisture transfer in concrete slabs on the ground. That report might seem a bit outside the actual subject. In fact it is not, since frost damage is always caused by excess water in the material. Hence, it is very essential to be able to predict the moisture contents likely to appear in the actual structure. In the last report (7) equations are derived for calculating the mean free distance between aggregate particles and airpores. Both those distances are of great importance for understanding the mechanism behind frost destruction and frost protection of concrete.