Numerical Model for Describing the Segregation Phenomenon in Lightweight Concrete Using Density Sections
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Title: | Numerical Model for Describing the Segregation Phenomenon in Lightweight Concrete Using Density Sections |
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Authors: | Tenza-Abril, Antonio José | Villacampa, Yolanda | Baeza Brotons, Francisco | Navarro-González, Francisco J. | Solak, Afonso M. |
Research Group/s: | Tecnología de Materiales y Territorio (TECMATER) | Ingeniería del Terreno y sus Estructuras (InTerEs) | Modelización Matemática de Sistemas |
Center, Department or Service: | Universidad de Alicante. Departamento de Ingeniería Civil | Universidad de Alicante. Departamento de Matemática Aplicada |
Keywords: | ANOVA | Compactation | Lightweight concrete | Prediction models | Segregation | Vibration |
Knowledge Area: | Ingeniería de la Construcción | Matemática Aplicada |
Issue Date: | 2018 |
Publisher: | WIT Press |
Citation: | International Journal of Computational Methods and Experimental Measurements. 2018, 6(4): 726-736. doi:10.2495/CMEM-V6-N4-726-736 |
Abstract: | In this work, numerical models were obtained for describing the segregation phenomenon in lightweight aggregate concrete. To that end, a numerical methodology based on the generation of geometric models of finite elements has been applied, selecting those that describe better this phenomenon. The use of lightweight aggregate concretes (LWC) allows greater design flexibility and substantial cost savings. It is also well known that it contributes to a positive impact on the energy consumption of a building due to the high-thermal resistance values. However, lightweight concretes are susceptible to present aggregate segregation due to density differences between its components during concrete vibration. Segregation in concrete may strongly affect the concrete global properties. This fact justifies the needs for the identification and quantification of this phenomenon, in order to estimate the concrete segregation experimentally, a LWC was mixed in laboratory conditions. Controlled segregation was caused applying different times of internal vibration in a cylinder specimen. The specimens were horizontally sectioned in order to obtain the density in each section because the segregation index can be estimated obtaining a relation by comparing the densities of the upper and lower parts. Firstly, ANOVA test was performed to determine the statistical significance (p<0.05) of the differences in the density of the different sections, differences in the aggregate type and differences in the time of concrete vibration. Results show that there is a significant difference of each section and there is no significant difference of each lightweight aggregate used to mix the concrete in spite of their different density. In order to model the segregation in the LWC, at first, linear models were considered and rejected because for not explaining the phenomenon. However, the application of numerical models shows good results to describe the phenomenon of segregation in LWC. |
Sponsor: | This research was funded by the University of Alicante (GRE13-03) and (VIGROB-256). |
URI: | http://hdl.handle.net/10045/70961 |
ISSN: | 2046-0546 (Print) | 2046-0554 (Online) |
DOI: | 10.2495/CMEM-V6-N4-726-736 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2018 WIT Press |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.2495/CMEM-V6-N4-726-736 |
Appears in Collections: | INV - TECMATER - Artículos de Revistas INV - INTERES - Artículos de Revistas INV - MMS - Artículos de Revistas INV - BIMAEC - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2018_Tenza-Abril_etal_IntJCompMethExpMeas.pdf | 2,13 MB | Adobe PDF | Open Preview | |
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