Portland Cement-Based Grouts Enhanced with Basalt Fibers for Post-Tensioned Concrete Duct Filling

In post-tensioned systems, grouts act as a last line of defense to prevent the penetration of harmful compounds such as chlorides, moisture and other substances that cause corrosion in the prestressing steel. For this reason, improving grouts results in the enhancement of the overall durability of the structure. In this study, the physical properties of grouts with basalt microfiber additions in the amounts of 0.03, 0.07 and 0.10% with respect to the mix volume were evaluated. The fresh properties included flowability and unit mass. Specimens were fabricated to evaluate drying shrinkage, compressive strength, air permeability and rapid permeability to chloride ions. The incorporation of basalt microfibers showed a beneficial effect on the physical properties of the grout by increasing the drying shrinkage resistance and decreasing the permeability compared to the reference mix and two commercial dry prepackaged grouts. The optimal grout mix was the one with a percentage of basalt microfibers of 0.10%, which decreased drying shrinkage by 15.98% at 14 days compared to the reference mix, and permeability to chloride ions decreased by 10.82% compared to the control mix.

Automated summary

In post-tensioned systems, grouts play a vital role in protecting prestressing steel from corrosion by preventing the penetration of harmful compounds. This study evaluated the physical properties of grouts with different percentages of basalt microfiber additions. The incorporation of basalt microfibers improved the drying shrinkage resistance and decreased the permeability to chloride ions compared to the reference mix and commercial dry prepackaged grouts. The optimal grout mix had a 0.10% percentage of basalt microfibers, reducing drying shrinkage by 15.98% and chloride ion permeability by 10.82% compared to the control mix.