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The pieces of mortar B tested within 28 days show a low brittleness index which initially justifies the ductile behaviour. But during the maturation there is a remarkable increase of Ib, about 4700%. Such tendency finds on facts in the diagrams which show an always steeper slope unloading branch as it evolves the maturation of material (Fig. 4). On the contrary, mortar D shows at 28 days a less ductile behaviour, but during the maturation the increase of brittleness is modest (50-200%) so it highlights a much more constant behaviour in the time.

4 RESULTS OF THE EXPERIMENTAL CAMPAIGN: MIXED TEST PIECES

4.1 Static tests

Compression tests were performed in order to determine the failure load (table 8). Others mixed test pieces were subjected to 28 freezing-thawing cycles. Of special interest is the medium and great increase in strength observed in CL and DL series after the freezing-thawing cycles (table 9).

Figure 8. Monoaxial cyclic compression test a — e curve. 4.2 Cyclic loading tests

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