Steel Fiber Reinforced Concrete as Sustainable Material for Construction of Slab on Grade – Review

Author Name(s): Sumit S. Geete, Manoj S. Tiwari, Mahendra S. Kadu
Author Email: sumit.geete@gmail.com

Abstract

Slab on grade is a slab directly supported on the soil. Slab on grade is used for construction of industrial floor and rigid pavement. For construction of slab on grade, fibers mainly steel fibers are used with specified doses. Addition of the fiber in the slab on grade improved the ductility and post cracking nature of the load verses deflection curve. Area under load deflection curve is called toughness. Peak load of SFRC is higher than the plain cement concrete. Steel fibers are more appropriate to used in slab on grade that synthetic and polypropylene fiber. Non linear fracture mechanics of concrete between cracks is evaluated to understand the performance of the SFRC. Parametric study carried out to evaluate the effect of type of steel fiber, dose of steel fiber and load – deflection curve on the depth of the slab on grade. Some equations and charts are proposed for the calculation of dose of fibers based on loading criteria and minimum depth of slab on grade. Plastic method, yield line analysis and non linear fracture mechanics methods consider for analysis and design of slab on grade. Slab on grade should be sustainable to perform satisfactorily intended use and economical. To design slab on grade with minimum slab thickness and optimum dose of fiber based on serviceability criteria reflects sustainability construction approach.

Introduction

The demands for an industrial floor have increased tremendously over the last few years. The main objectives for an industrial floor are to transfer the loads to the sub-base and to provide a hard and even surface to work. Industrial floor should sustained the all the types of load imposed over. Industrial floor is necessary to be sustainable based on performance and economy. Slab on grade means slab supported on the foundation soil beneath. In industrial floor slab on grade, use of steel fiber instead of steel reinforcement more preferred. From the literature, use of steel fibers in the slab on grade is more economical, durable than the conventional steel reinforcement concrete. The mechanical properties and cracking behaviour are improved by adding steel fibers to the concrete mix. The thickness of the floor is function of the loading, modulus of sub grade and flexural strength of the concrete. Flexural strength of the concrete depends on the types of fiber, dose of fiber and post cracking nature of the load- deflection curve.

Conclusion

Steel fiber is effectively used in slab on grade construction. Load – deflection behaviour of the FRC slab on grade is indicated the increment of peak load capacity because of increment of strain energy due to addition of steel fiber. Durability of steel FRC is more the welded wire mesh reinforcement slab on grade. Steel fiber is more effective rather polypropylene fiber for constriction of slab on grade. Design of thickness steel FRC slab on grade is basically depends on the loading condition, grade of concrete, type off fiber and dose of fiber. It is necessary to develop the methodology for design of FRC slab on grade

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