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81Knowing the gradation characteristics corresponding to 1/10 th scale aggregate, a convenientaggregate proportion table was developed to ease process of mixing aggregate for modelpiers (Table 21).Table 21: 1/10 th scale aggregate pier mix proportionsSieve # Sieve opening Percent Amount#10 2 9 294size, mm retained, % retained, g#16 1.2 49 1601#20 0.9 20 653#30 0.6 9 294#40 0.5 3 98Pan < 0.5 10 327Total 3,267The mix, outlined above, constitutes a certain amount of aggregate retained on each of thespecified sieves for the total amount of 3,267 g of mixed material and is suitable forconstruction of one 305 mm aggregate pier at total number of 12 lifts.As previously discussed, whenever creating a scaled model aggregate pier it was critical toensure proper scaling of the composition material being used. The relative dimensions of theaggregate particles present in the sample play important role. Having 76 mm diameter scaledaggregate piers to be used for load testing, the outcome results were to be representative aslong as the diameter of the aggregate pier is greater than six times the size of the largestparticle present within a sample (Marachi et.al. that 1972). Having 2 mm particle diameter tobe the limiting aggregate particle size of the prototype aggregate pier, it is obvious that thediameter/particle size ratio was not affected.The process of scaling limestone aggregate served the purpose of creating mix for scaledaggregate piers, however, the approach had to inevitably lead to an increased portion of fineswhich had a potential to impact the overall properties of mixed material (Hanlong, 2008).This could potentially lead to deviation in vital aggregate properties like void ratio, densityand shear strength. Therefore, when creating a prototype scale pier it was first important tocompact aggregate to the same relative density in order for the particle interlock strength andvoid ratio parameters to be reproduced (Lim et.al., 2004). It has been observed for the full-