Flexural stiffness and structural behavior of alkali-activated metakaolin faced with cement-based beams

Lopes, Adelino V.; Lopes, Sérgio M.R.; Pinto, M. I. M.

doi:10.1016/j.jobe.2023.107310

Cited by 1 publication

(2 citation statements)

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“…The primary objective is to address a question that emerged during the pouring of MK geopolymer beams. Specifically, it was observed that the surface temperature of the beams reached around 47 • C [20]. This temperature exceeded that which the authors had previously witnessed during the curing of small samples or concrete masses.…”

Section: Introductionmentioning

confidence: 66%

“…The objective of this study is to assess the practicality of using geopolymers made by alkaline activation of MK as a sustainable substitute for concrete in structural applications. As an exploratory investigation of the mechanical characteristics of geopolymers, this research aims to evaluate the mechanical strength of several MK-based geopolymer specimens subjected to various curing temperatures (10,15,20,30,40, and 50 • C). Importantly, these materials do not require additional energy for curing after mixing, thus aligning with the goal of producing eco-friendly materials.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Curing Temperature on the Strength of a Metakaolin-Based Geopolymer

Lopes,

Pinto

2023

Materials

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The present work focuses on the further development of a new family of geopolymers obtained by the alkaline activation of a binder. The aim is to find a viable alternative to concrete that can be used in civil construction. Regarding the influence of the curing temperature on this type of mixture, the recommendations in the existing literature are different for fly ash, ground granulated blast-furnace slag, and metakaolin-based geopolymers. While for fly ash and slag, increasing the curing temperature above 60 °C is reported to be advantageous, for metakaolin geopolymers, the opposite is reported. In this context, the objective of this work is to evaluate the mechanical strength of several metakaolin-based geopolymer specimens subjected to different curing temperatures (10, 15, 20, 30, 40 and 50 °C). Furthermore, several stress-strain diagrams are also shown. Based on the results, we recommend using curing temperatures below 30 °C in order to avoid reducing the strength of metakaolin-based geopolymers. Curing at 50 °C, relative to room temperature, results in a reduction of more than 35% in flexural strength and a reduction of more than 60% in compressive strength. Regarding the behavior of the geopolymers, it was found that the strain, at the ultimate stress, is about 2 to 2.5 times the strain of an equivalent cement mortar.

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Section: Introductionmentioning

confidence: 66%