No abstract

Natural pozzolans are colossal wellspring of receptive silica and alumina required for geopolymer amalgamation as an alternative binder for conventional Portland concrete. They are accessible at a relatively minimal effort and produce a low environmental impression through their basic extraction. Following audit paper condenses the mechanical and durability attributes just as the micro structural properties of common pozzolan based geopolymers and their potential as binder. The stretch out of geopolymerization increments with the expansion of curing temperature invigorating higher compressive at early ages with no huge effect on later age strength, in any case, expansion of different cementitious materials and hybrid binder improves the mechanical and durability properties of these geopolymers. This paper displays a succinct audit of different examinations that have demonstrated the use of different modern waste items in the amalgamation of geopolymers.

No abstract

Plain cement concrete is strong in compression and weak in tension which fails on application of tensile load. This research focuses on the eradication of such catastrophic failure in plain cement concrete by the utilization of crimped polypropylene fibres in high strength concrete. Experiments involving the addition of fibres in concrete have increased now days for its application in field practices ranging from steel, glass, polyester, polypropylene etc. In our present study, polypropylene fibres were added in the relative volume fractions of 0.1%, 0.2% and 0.3% with w/c ratio of 0.35. Various studies like compressive strength, split tensile strength and flexural strength at the age of 7 days and 28 days under normal curing and steam curing were performed and the behaviour of fibres was studied. Results concluded that addition of crimped fibres at 0.3% under steam curing had improved the behavioural properties of the concrete.

The major issue in the construction industry is to address the development of the suitable building material in a non depleting way to the environmental society. To effectively utilize the industry by-products in the construction sector will bring the cost effective solution and non polluting manner. Hence in this experimental investigation, M30 grade concrete is used in partial replacement of flyash by 0%, 10%, 20% and 30% for evaluating strength parameters. Once the optimum flyash percentage is arrived, then the steel scraps are incorporated in the percentage of 0%, 0.5%, 1%, 1.5% and 2% to enhance the strength properties further. As a result, it is profound that the optimum percentage of flyash replaced concrete is 20 % and addition of 1.5 % steel scraps is appropriate in enhancing the strength parameters. Modeling is adopted in arriving relationship for compressive strength with tensile and flexural strength for flyash replacements and addition of steel scraps. All the model equations are well correlated with the experimental results.