Abstract

This research aimed to investigate the suitability of chopped basalt fibers for inducing ductility in High Strength Concrete (HSC). HSC offers a sustainable option to the rapidly growing construction industry particularly in long span bridges, high-rise structures together with other infrastructures. Until near past, efforts were made to achieve much higher compressive strength of HSC, which causes HSC being more brittle. In view of high brittleness of HSC many researchers focused on fiber reinforced concrete to induce ductility. In this study two series of mixes, one with 100% cement and the other with 80% cement with 20% fly ash were studied. In the both of series mixes, fiber content was varied as 0, 0.25, 0.75, 1, 2 and 3%, respectively. Concrete with 0% fibers is known as the control mix. Since, water/binder ratio and super-plasticizer content was kept constant. The tests result indicated that, slump of concrete mixes showed decline with the increment in the fiber content. The addition of chopped basalt fibers did not help to improve the compressive strength of HSC. However, fibers have improved tensile and flexural tensile strength of HSC, also the area under the stress strain curves increased, which are an indication of ductile mode of HSC as well as its toughness. Similarly, tensile to compressive strength and flexural to compressive strength ratio observed a continuous increment with the increase in fiber content as well as the areas under compressive stress- strain curves. In conclusion, chopped basalt fibers have shown their potential for producing ductile HSC.

Highlights

  • Use of High Strength Concrete (HSC) is continuously increasing due to improvement in its strength and durability characteristics

  • This study was an experimentally investigation to improve the tensile strength, toughness and brittleness, flexural and tensile strength of 100% OPC HSC and 80% OPC with 20% replacement of cement by fly ash HSC mixes utilizing a different amount of CBFS as internal strengthening materials. (0.25, 0.5, 0.75, 1, 2 and 3%, respectively) CBFS by weight of binder materials for each group mix were considered to complete this comparison

  • The results showed that Splitting and flexural tensile strength at 28 and 90 days significantly increased as increasing of CBFS content

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Summary

Introduction

Use of HSC is continuously increasing due to improvement in its strength and durability characteristics This kind of concrete is needed in high rise buildings, long span bridges and hydraulic structures. HSC reinforced by steel is not friendly with the environmental conditions as well as its cost These shortcomings have been controlled by an addition of small closely spaced and uniformly dispersed fibers to the concrete. Fibers can be prevent macro crack and can act as a bridge to transfer the load It can be effective in increasing the static and dynamic properties of the plain concrete. This kind of concrete in the literature is defined as a Fiber Reinforced Concrete (FRC). Fiber reinforced composites satisfy more than other composites materials even the traditionally reinforcement published by Padmarajaiah and Ananth (2004), Rahimi and Kelser (1979), Alsayed and Alhozaimy (1999), Emadi and Hashemi (2011) and Balendran et al (2002)

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