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Engineering properties such as compressive strength, splitting tensile strength, modulus of rupture, modulus of elasticity and Poisson"s ratio of geopolymer concrete (GPC) and steel fibre reinforced geopolymer concrete (SFRGPC) have been obtained from standard tests and compared. A total of 15 specimens were tested for determining each property. The grade of concrete used was M 40. The percentages of steel fibres considered include 0.25%, 0.5%, 0.75% and 1%. In general, the addition of fibres improved the mechanical properties of both GPC and SFRGPC. However the increase was found to be nominal in the case of compressive strength (8.51%), significant in the case of splitting tensile strength (61.63%), modulus of rupture (24%), modulus of elasticity (64.92%) and Poisson"s ratio (50%) at 1% volume fraction of fibres. An attempt was made to obtain the relation between the various engineering properties with the percentage of fibres added.

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The use of rubber in self-compacting concrete is gaining more attention from the point of view of improved engineering properties of the product and also sustainability. Although several attempts have been reported on the utilization of crumb rubber for the replacement of coarse aggregate in conventional concrete and to some extent in self-compacting concrete, limited information is only available on the use of rubber as replacement for fine aggregate. This article mainly deals with the development of self-compacting concrete with varying proportions of powdered rubber as filler (fine aggregate replacement). The self-compactability characteristics and the engineering properties of self-compacting rubberized concrete mixes with varying compressive strengths have been experimentally evaluated. The experimental values have been compared with those of conventional rubberized concrete available from the past studies. The results indicate that self-compacting rubberized concrete has better engineering properties, which are most desirable for structural purposes, in comparison with conventional concrete with and without rubber.