Abstract. The present study focus on the systematic design methodology for producing a self-compacting concrete (SFRSCC) consisting of steel fibre reinforcements. It is intended to achieve a self-consolidating concrete which can yield dual benefit of self-consolidating properties as well as toughness of the composite. Experimental modelling consisted of designing the mortar phase using manufactured sand (M-sand) as fine aggregate using systematic mix design methodology based on particle packing concept. Optimisation of aggregates was arrived based on packing density concept by conducting slump cone studies. Powder combinations consisting of cement and ground granulated blast furnace slag (GGBFS) were selected by conducting paste consistency test. Finally, superplasticizer dosage was fixed based on Marsh cone studies and volume fraction of steel fibres from slump flow studies. The workability of standard and high strength concrete is affected by the inclusion of steel fibre dosage and the fresh properties revealed the importance of maintaining a high paste volume for better flow ability. Based on the proposed mix design methodology with M-sand a high strength self-compacting concrete was achieved upto 70MPa. Experimental investigations were reported on the other assessment made from fresh and hardened properties of designed self-compacting steel fibre concrete mixes. Also, the outcome of test results revealed the possibility of using M-sand as an alternative for complete replacement of river sand.
Self Compacting Concrete (SCC) is a tailored concrete mix, strongly dependent on the constituent proportions and the physical characteristics of the constituents. In order to achieve the self compacting concrete, mortar phase plays a vital role as it contributes to the active suspension phase of aggregates. High powder content and optimum fine aggregate is required for the desired flowability and stability of mortar. Hence, for accomplishing a self compacting concrete, the design of paste and mortar phase needs to be carefully proportioned. A positive correlation exists between the flow properties of the concrete and the packing density of the mix. The packing density of the cementitious materials plays a key role in deciding the final strength of concrete. Improved packing offers the benefit of reduction in water demand, reduced permeability, reduction in bleeding and reduced porosity of the transition zone. The objective of this study is to design the mortar phase for a self compacting concrete reinforced with glass fibres by applying the concept of particle packing. Design of paste and mortar phase was done based on particle packing approach using Puntke test. Initially the powder content (cement and slag) was arrived based on Puntke test and the optimum addition of slag was determined with the slag activity index. The super plasticizer dosage was fixed by performing flow studies using Marsh cone test and the fine aggregate content was established by Puntke Test. The selected powder to fine aggregate content established by particle packing method was taken for mini slump studies and further the optimization of glass fibres content is determined. The outcome of the current study exposed the possibility of obtaining a self compacting mortar incorporating glass fibres which in turn useful for designing the self-compacting concrete.
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