G MS THESIS_final version_Maxim Prokudin.pdf - Digital Repository ...

87As the expansive and contractive nature of cement type K mixed with cement type I has beenextensively studied by different researchers a good graphical depiction of the behavior of twomaterials is outlined in Figure 52 (Mehta and Monteiro, 2006).Grout Piers - NS7NS7 component was obtained from Fritz-Pak, Anderson Superior Products, Yankton, SouthDakota (Figure 53). According to the manufacturer’s specification the product is used for theincreasing compressive and shear strength, and enhancing workability. Reduced shrinkagefor the cement mixes with NS7 is another benefit of the compound.Figure 53: NS7 admixture compoundIt is important to emphasize the expansive nature of NS7 compound in this research. Whenporing the mixtures in cavities and allowing the grout to cure, the benefit of expansive natureof the material can be outlined where the grout would tend to fill all the voids and maximizeskin friction of the column or pier to a better extent. The cement type I, K, NS7 and cementtype I, NS7 mixtures expanded significantly within the first few minutes after the mix waspoured inside the cavity. It was also observed for the cement type I, K, NS7 mixtures toexpand to a much greater degree due to presence of both expansive cement type I and NS7components. The observations are consistent with the ones obtained in a grout study researchperformed at Iowa State University (ISU) by White et.al., 2009.