Abstract
The effect of Y type polypropylene fiber on plastic shrinkage cracking of cement mortar was studied. The test results showed that crack width and the total weighted cracking value decreased when Y type polypropylene fiber was added to the cement mortar. The effect of the fiber on plastic shrinkage cracking resistance increased with an increase in fiber volume fraction in the range of 0.05% to 0.15%. The total weighted cracking value decreased by about 88% at a fiber volume fraction of 0.15%. It was also found that, under these experimental conditions, the total weighted cracking value conformed to a trivariable linear regression equation with fiber volume fraction, temperature and relative humidity as variables. The relative importance of these three variables on plastic shrinkage cracking was fiber content>temperature>relative humidity.
Résumé
On étudie l'influence de la fibre de polypropylène en forme d'Y sur la fissuration sous retrait plastique du mortier de ciment. Les résultats expérimentaux indiquent que la valeur pondérée de fissuration globale des mortiers de ciment commence à diminuer par l'addition de fibre de polypropylène en forme d'Y au mortier de ciment. En fonction du volume de fibres de 0.05% à 0.15% la résistance à la fissuration sous retrait plastique des mortiers fibrés augmente. La valeur pondérée de fissuration globale du mortier en volume de 0.15% de fibres est réduite de 88%. Il apparaît que dans les conditions expérimentales la valeur pondérée de fissuration globale correspond à la relation de tri-variable régression linéaire avec trois paramètres c'est à dire le volume de fibres, la température et l'humidité relative. L'importance de ces trois paramètres est la suivante: volume de fibres>température> humidité relative.
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Ma, Y., Zhu, B., Tan, M. et al. Effect of Y type polypropylene fiber on plastic shrinkage cracking of cement mortar. Mat. Struct. 37, 92–95 (2004). https://doi.org/10.1007/BF02486604
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DOI: https://doi.org/10.1007/BF02486604