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Open AccessArticle

Experimental Study on Full-Scale Beams Made by Reinforced Alkali Activated Concrete Undergoing Flexure

DICATAM—Department of Civil Engineering, Architecture, Environment, Land Planning and Mathematics, University of Brescia, 25123 Brescia, Italy
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Academic Editors: Arie van Riessen and Claudio Ferone
Materials 2016, 9(9), 739; https://doi.org/10.3390/ma9090739
Received: 15 May 2016 / Revised: 24 July 2016 / Accepted: 22 August 2016 / Published: 30 August 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
Alkali Activated Concrete (AAC) is an alternative kind of concrete that uses fly ash as a total replacement of Portland cement. Fly ash combined with alkaline solution and cured at high temperature reacts to form a binder. Four point bending tests on two full scale beams made with AAC are described in this paper. Companion small material specimens were also casted with the aim of properly characterizing this new tailored material. The beam’s length was 5000 mm and the cross section was 200 mm × 300 mm. The AAC consisted of fly ash, water, sand 0–4 mm and coarse aggregate 6–10 mm; and the alkaline solution consisted of sodium hydroxide mixed with sodium silicate. No cement was utilized. The maximum aggregate size was 10 mm; fly ash was type F, containing a maximum calcium content of 2%. After a rest period of two days, the beam was cured at 60 °C for 24 h. Data collected and critically discussed included beam deflection, crack patterns, compressive and flexural strength and elastic modulus. Results show how AAC behavior is comparable with Ordinary Portland Cement (OPC) based materials. Nonlinear numerical analyses are finally reported, promoting a better understanding of the structural response. View Full-Text
Keywords: alkali activated concrete; fly ash; geopolymer concrete; material characterization; structural characterization alkali activated concrete; fly ash; geopolymer concrete; material characterization; structural characterization
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MDPI and ACS Style

Monfardini, L.; Minelli, F. Experimental Study on Full-Scale Beams Made by Reinforced Alkali Activated Concrete Undergoing Flexure. Materials 2016, 9, 739.

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