Title: Accelerated Tests to Measure Efflorescence and Effect of Pozzolans
Author(s): Diogo Henrique de Bem and Ronaldo A. Medeiros-Junior
Publication: Materials Journal
Appears on pages(s): 113-124
Keywords: accelerated test; efflorescence; fly ash; lime-cement mortar; silica fume
No widely accepted method is available to assess the efflorescence in small-scale mortar specimens. Thus, the analysis and determination of parameters that actually have an influence on the occurrence of efflorescence in cementitious materials become difficult to be accomplished, especially considering that its appearance in natural field conditions can take months or even years to happen. This paper has the objective to compare eight small-scale accelerated test methods for the assessment of efflorescence in lime-cement mortars and then to evaluate their sensibility to variations in the mixture composition. The results show that the method in which a water column introduces pressure produced the highest amount of efflorescence in the smallest time. The method was able to clearly identify the impact of silica fume towards the refinement of the porous microstructure and the efflorescence reduction. This study demonstrates that 28 days is enough time to finalize the accelerated testing proposed.