Behaviour of Fibre-Reinforced Rubcrete Beams Subjected to Impact Loading
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ORIGINAL CONTRIBUTION
Behaviour of Fibre-Reinforced Rubcrete Beams Subjected to Impact Loading Anand Raj1
•
Praveen Nagarajan1 • A. P. Shashikala1
Received: 3 December 2019 / Accepted: 31 August 2020 Ó The Institution of Engineers (India) 2020
Abstract Impact resistance of a material is of utmost significance in many essential structural applications. But, concrete is weak in withstanding impact/collision/blast loads. Addition of crumb rubber as a replacement of mineral aggregates has yielded a material which has high impact resistance and is termed as rubcrete. It has been observed that 0–20% replacement of fine aggregates with crumb rubber produces rubcrete with high energy absorption capacity. But, rubcrete is usually associated with a reduction in strength. Pretreatment of crumb rubber particles and grading them in the same proportion as that of the fine aggregates will help to mitigate the reduction in strength. Addition of steel and polypropylene fibres aids in maintaining the strength characteristics of rubcrete and facilitates control in the generation and propagation of cracks. Improved energy absorption characteristics were observed for steel and polypropylene fibre contents up to 1% and 0.3%, respectively. In order to determine the optimum proportions of crumb rubber, steel fibres and polypropylene fibres, the energy absorption capacity of prisms of size 100 9 100 9 500 mm was evaluated. Results show that 15% of crumb rubber, 0.75% of steel fibres and 0.2% of polypropylene fibres were the ideal proportions of crumb rubber, steel fibres and polypropylene fibres, respectively, to attain maximum energy & Anand Raj [email protected] Praveen Nagarajan [email protected] A. P. Shashikala [email protected] 1
Department of Civil Engineering, National Institute of Technology Calicut, Calicut, Kerala, India
absorption/cost ratio. This paper presents the results of numerical and experimental studies conducted on the impact behaviour of M 40 and M 60 grade ordinary concretes, rubcrete and fibre-reinforced rubcrete beams of dimensions 100 9 150 9 1200 mm. Durability studies were also carried out on fibre-reinforced rubcrete mixes to ascertain their behaviour in extreme environments. From the durability studies, it was noticed that when exposed to severe environments, fibre-reinforced rubcrete specimen had comparable properties with that of ordinary concrete. Keywords Rubcrete Steel fibre-reinforced rubcrete Polypropylene fibre-reinforced rubcrete Impact load
Introduction Structures are subjected to impact loads when any collision occurs in their vicinity [1, 2]. Pedersen et al. and Blok et al. had discussed impact loads caused due to the collision of ships on offshore structures [3, 4]. Some structures like crash barriers are subjected to impact forces due to collision from vehicles [5]. Blasts from various sources have different effects on structural elements. As such, sources of impact could vary from vehicular impact or any form of blast loads. Technological advancements have ensured more powerful
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