Statistical evaluation of the mechanical properties of high-volume class F fly ash concretes

•CEB–FIP models are utilized for estimating the mechanical properties of HVFA concrete.•We examine whether it is better to use weight- or volume-based mix design for HVFA concrete.•Samples with 0.3w/b ratio have the lowest development rate among 60% HVFA samples.•ANOVA tests provide the significance...

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Bibliographic Details
Published in:Construction & building materials 2014-03, Vol.54, p.432-442
Main Authors: Yoon, Seyoon, Monteiro, Paulo J.M., Macphee, Donald E., Glasser, Fredrik P., Imbabi, Mohammed Salah-Eldin
Format: Article
Language:English
Subjects:
Analysis
ANOVA test
Compressive strength
Concrete
Fly ash
Mechanical properties
Mix design
Statistical analysis
Testing
Young’s modulus
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Summary:•CEB–FIP models are utilized for estimating the mechanical properties of HVFA concrete.•We examine whether it is better to use weight- or volume-based mix design for HVFA concrete.•Samples with 0.3w/b ratio have the lowest development rate among 60% HVFA samples.•ANOVA tests provide the significance level of mix-design parameters on mechanical properties. High-Volume Fly Ash (HVFA) concretes are seen by many as a feasible solution for sustainable, low embodied carbon construction. At the moment, fly ash is classified as a waste by-product, primarily of thermal power stations. In this paper the authors experimentally and statistically investigated the effects of mix-design factors on the mechanical properties of high-volume class F fly ash concretes. A total of 240 and 32 samples were produced and tested in the laboratory to measure compressive strength and Young’s modulus respectively. Applicability of the CEB–FIP (Comite Euro-international du Béton – Fédération Internationale de la Précontrainte) and ACI (American Concrete Institute) Building Model Code (Thomas, 2010; ACI Committee 209, 1982) [1,2] to the experimentally-derived mechanical property data for HVFA concretes was established. Furthermore, using multiple linear regression analysis, Mean Squared Residuals (MSRs) were obtained to determine whether a weight- or volume-based mix proportion is better to predict the mechanical properties of HVFA concrete. The significance levels of the design factors, which indicate how significantly the factors affect the HVFA concrete’s mechanical properties, were determined using analysis of variance (ANOVA) tests. The results show that a weight-based mix proportion is a slightly better predictor of mechanical properties than volume-based one. The significance level of fly ash substitution rate was higher than that of w/b ratio initially but reduced over time.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2013.12.077