CEMENT-BASED MATERIALS INCORPORATING RUBBER AGGREGATES: SHRINKAGE LENGTH CHANGES

摘要: ABSTRACT Cement-based materials are brittle. As a consequence to their poor straining capacity and sensitivity shrinkage, they generally present cracking detrimental the durability of structures. Nowadays, solution prevent or delay shrinkage remains research issue. Fibre reinforcement, restraining crack opening, is one most documented way partly reach this objective. This paper focuses on second option decrease brittleness cementious materials: incorporation low modulus aggregates. The study aims design composite exhibiting high ability before macrocracking localisation. It has been assumed that incorporating aggregates with deformation should succeed challenge. Rubber were chosen. They confer work facet: opportunity recycle rubber tyres, fulfilling demand clean environment conservation. results presented compare properties plain mortar ones two mixes obtained by partially replacing sand Two ratios replacement, 20 30% volume, investigated. In both cases (natural aggregates), maximum grain size 4 mm was used. Previous had shown strongly strength. return, elasticity substantially decreased its failure significantly increased. On another hand rubberised mortars suffer higher length changes due than mortar. order weigh up benefits deficits, ring tests have carried out clearly demonstrate benefit: enhanced aggregate substitution widely offsets additional changes. future prospects combination beneficial effects fibre reinforcement cimentitious ductile failure.