International Journal of Engineering and Technology Innovation, vol. 9, no. 2, 2019, pp. 131-144 Dynamic Poisson's Ratio and Modulus of Elasticity of Pozzolana Portland Cement Concrete Priyaranjan Pal * Department of Civil Engineering, Motilal Nehru National Institute of Technology Allahabad, Uttar Pradesh 211004, India Received 25 August 2018; received in revised form 22 September 2018; accepted 12 December 2018 Abstract An experimental investigation was carried out to determine the dynamic Poisson's ratio and modulus of elasticity of pozzolana Portland cement concrete. Large numbers of concrete cubes were prepared and tested in the laboratory for investigation. The destructive and non-destructive tests were conducted on concrete cubes at different ages. The destructive test was conducted to obtain the compressive strength of concrete cubes. Ultrasonic pulse velocity of cube specimens was derived according to IS 13311 (Part 1) and the transit time of longitudinal and shear waves transmission was recorded. The recorded values are used to determine the dynamic values of Poisson's ratio and elastic modulus of concretes. Based on experimentally obtained data and analysis, a few relationships are proposed to correlate the water/cement ratio, Poisson's ratio, elastic moduli and compressive strength of concretes. Several interesting findings are observed from the correlations of the coefficients while analyzed by regression analysis. This study helps to determine the static properties of concrete from the dynamic ones. Keywords: pozzolana Portland cement, Poisson's ratio, modulus of elasticity, ultrasonic pulse velocity, mix proportion 1. Introduction According to IS 456 clause 6.1 [1], the concretes are classified into three groups, i.e., low, medium, and high strength concretes. Today, low and medium strength concretes are the most commonly used concrete in the construction of civil engineering structures. The Poisson's ratio and elastic modulus are the significant parameters used in the analysis and design of concrete structures. The Poisson's ratio of a material influences the speed of propagation and reflection of stress waves. How a concrete specimen bulges when subjected to compressive load and the ability of a material to be strained can be easily known with the value of Poisson's ratio. The static modulus of elasticity can be estimated from the compressive strength according to the standard design code rather than on direct measurement. However, this practice underestimates the demand of higher compressive strength to achieve the desired value that is actually required in the structural design. Hence, the dynamic properties of concrete should be ensured in addition to the concrete compressive strength. Although, the dynamic modulus of elasticity can be determined by assuming the value of Poisson's ratio but 30% error may be introduced in the calculated values of dynamic modulus [2]. For an existing structure, dynamic Poisson's ratio, and modulus of elasticity can be determined by the non-destructive testing method. The dynamic values obtained by NDT cannot match with the static values, but their relationships can be established. In order to establish their relationships, regression technique may be considered to correlate the coefficients. * Corresponding author. E-mail address: [email protected] Tel.: +919451071844; Fax: +915322545341 CORE Metadata, citation and similar papers at core.ac.uk Provided by Taiwan Association of Engineering and Technology Innovation: E-Journals
Dynamic Poisson's Ratio and Modulus of Elasticity of Pozzolana Portland Cement Concrete
Jun 23, 2023
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