Estimation of lightweight expanded clay aggregate concrete’s compressive strength by using meta-analysis

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2023-1-27

Author

Uslu, İlbüke

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One of the most effective methods of reducing the density of concrete is the incorporation of lightweight aggregates. Lightweight expanded clay aggregate (LECA) is preferred in lightweight concrete production due to its high compressive strength when compared to other lightweight aggregates. The study aims to assess the compressive strength of LECA incorporated lightweight concrete through meta-analysis. Within the scope of the study, more than 140 data points are compiled through literature and analyzed to conduct the meta-analysis of LECA incorporated lightweight concrete properties. Detailed statistical analysis procedures such as ANOVA and regression analysis are used to investigate the relations between the amount of LECA, w/c ratio, amount and type of binder, and the compressive strength and density of lightweight concrete. An equation is derived to estimate the relationship between the 28-day compressive strength and the evaluated variables based on the regression analysis. It includes 15 different studies conducted independently, as the equation is derived by using the meta-analysis. It is statistically more robust than single studies conducted independently from each other due to the combined effect. Results indicate that the effect of LECA, water, and cement on the 28-day compressive strength is more than the amount of fly ash and silica fume. Moreover, 13 different mixtures are prepared to evaluate the accuracy of the estimations according to the compressive strength test results. Estimations and compressive strength test results are compared to determine the accuracy of the derived equation.

Subject Keywords

Lightweight expanded clay aggregate, Lightweight concrete, Meta-analysis, Strength estimation

URI

https://hdl.handle.net/11511/102543

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

İ. Uslu, “Estimation of lightweight expanded clay aggregate concrete’s compressive strength by using meta-analysis,” M.S. - Master of Science, Middle East Technical University, 2023.