par Lacante, Maïté 
;Delsaute, Brice ;Staquet, Stéphanie
Référence Materials, 18, 2025, page (46), 4577
Publication Publié, 2025-10-02
;Delsaute, Brice ;Staquet, Stéphanie Référence Materials, 18, 2025, page (46), 4577
Publication Publié, 2025-10-02
Article révisé par les pairs
| Résumé : | The goal of this paper is to assess the evolution of the autogenous strains as well as thethermal strains (thanks to the assessment of the coefficient of thermal expansion) of alkali-activated slag-based materials at early age. The effect of the sand and the coarse aggregateson the paste and mortar scale to upscale to mortar and concrete, respectively, has beeninvestigated as a function of the age of the material. The restraint imposed by the sandon the paste seemed more significant than that of the coarse aggregate on the mortar. Inaddition, the long-term autogenous strains have been monitored on the mortar scale. Theseresults revealed a separation into groups based on the solution concentration. Differenttesting methods were also compared. Thermal and autogenous strains were monitoredwith a customized testing device where the thermal variations are controlled. These deviceswere the horizontal corrugated tubes method (for tests on paste and mortar scales) and thevertical corrugated tubes method (for tests on mortar and concrete scales). Depending onthe compositions (lower concentration), good correlations can be obtained between the twotesting methods. Moreover, the autogenous strain of two different specimen sizes was alsoassessed manually (initially for the long-term), but early-age comparison showed goodcorrelation for lower solution-to-binder ratios. On the concrete scale, a correlation basedon the modified equations from the standards was established between the compressivestrength and the tensile strength, obtained from the splitting tensile test. |
