Physical and Mechanical Characteristics of Lime-based Cementitious Grout

Abstract

Grout is an essential part in soil and rock anchoring while large amount of grout is consumed in anchoring process and capacity of anchoring can be increased by strengthening the grout. Increasing the strength of the grout or achieving the strength of the cement-based grout by partially replacing the cement with hydrated lime and by adding coir fiber can produce sustainable and structurally acceptable grout. This research study investigates grout with water/solid (w/s) ratio of 0.45, 0.7 while replacing the blended Hydraulic cement (BHC) content with hydrated lime by 35%, 50% and 65% with 1% coir fiber, superplasticizer and silica fume. The results show that flow of the grout is reduced with the addition of lime, fiber. Bleeding is improved in the lime-based grout. Compressive strength reduces with the addition of lime while grout achieves improved strength in long term. Compositions with 35% Lime content showed better performance and w/s ratio of 0.45 had the best compositions comparing the physical and mechanical characteristics. The fiber grout sample with w/s = 0.45 and 35% lime content had the best results with flow of 135mm, final bleeding of 3.75%, bleeding settlement in less than one hour and compressive strength at 7days, 28days are 10.4Mpa, 21.75Mpa respectively.