This study investigates the ameliorative effects on some properties of cement-based materials which can be obtained by\nincorporating rubber particles as part of the fine aggregates. The aim is to find out optimal cement composite/mortar mixtures,\ncontaining recycled-tyre rubber particles, suitable for specific engineering applications. Different percentages of rubber particles,\nfrom 0% to 75%, were used and, for each percentage, the suitable amount of sand was investigated in order to achieve the best\nfresh/hardened performances. In particular the following characteristics were examined: density, compressive strength, modulus\nof elasticity, shrinkage, weight loss, flexural behaviour, thermal conductivity, rapid freezing and thawing durability, and chloride\npermeability. The experimental results were compared with the ones of cement composite specimens without rubber aggregates.\nTest results show that the proposed rubberized mortar mixes are particularly suitable for some industrial and architectural\napplications, such as under-rail bearings, road constructions, paving slabs, false facades, and stone backing.
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