Comparative Analysis of Young’s Modulus Predictions for Lightweight Aggregate Concrete

2020 ◽  
Vol 857 ◽  
pp. 66-73
Author(s):  
Meriem Fakhreddine Bouali
Keyword(s):  
Comparative Analysis ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Lightweight Aggregate ◽  
Analytical Models ◽  
Lightweight Aggregate Concrete ◽  
Good Prediction ◽  
Two Phase ◽  
Aggregate Concrete ◽  
Composite Models

Many experimental and numerical works are attempting to predict the elastic properties of Lightweight Aggregate Concrete (LWAC). The purpose of this paper is to estimate the Young’s modulus of Lightweight Aggregate Concrete utilizing two-phase composite models. However, results of experimental data published in the literature were used as a platform, upon which, two-phase composite models had been utilized. The outcomes of this comparative analysis show that neither of the two-phase analytical models could be directly utilized for predicting Young’s modulus of LWAC. The Hashin-Hansen composite model provides a good prediction of experimental Young’s modulus of all LWAC tested with a maximum error percentage equal to 16.94%. This model provides an upper bound whereas the Counto2 model provides the lower bound of experimental Young’s modulus of LWAC.

scholarly journals Predicting the mechanical properties of lightweight aggregate concrete using finite element method

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Aldemon Lage Bonifácio ◽  
Julia Castro Mendes ◽  
Michèle Cristina Resende Farage ◽  
Flávio de Souza Barbosa ◽  
Anne-Lise Beaucour
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Compressive Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Lightweight Aggregate ◽  
Numerical Results ◽  
Lightweight Aggregate Concrete ◽  
Percentage Error ◽  
Element Method

Abstract The compressive strength (fc) and Young’s modulus (Ec) of concretes are properties of great importance in civil engineering problems. To this day, despite the relevance of the subject, concretes are still designed based on charts and empirical formulae. This scenario is even more imprecise for lightweight aggregate concretes (LWAC), which contain less design methodologies and case studies available in the literature. In this sense, the present work presents a numerical simulation for predicting the properties of LWAC’s specimens using the Finite Element Method. The material was considered as biphasic, comprising lightweight aggregates and the enveloping mortar. Each phase was modelled with its own compressive strength, tensile strength and Young’s modulus. The achieved numerical results for fc and Ec were compared with their experimental counterparts, obtained from the literature. In total, 48 concrete formulations were assessed. Numerical results showed fair agreement with the experimental data. In general, the Mean Absolute Percentage Error (MAPE) was lower for the shale aggregates for both Young's modulus (1.75% versus 4.21% of expanded clay) and compressive strength (4.19% versus 9.89% of expanded clay). No clear trend of error was identified in relation to the aggregate proportion or to the mortar types, in which the MAPE varied from 2.36% to 8.13%. In conclusion, the simplification to spherical aggregates has shown satisfactory results, as has the adoption of a 2D model, which require less computational resources. Results encourage further applications with more complex geometrical aspects to improve the mix design and safety of LWAC.

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