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

79the second stage of testing. Moisture content was maintained within 23 and 25 percentmargin, unit weight 1,600 kg/m 3 and undrained shear strength close to 40 kPa.Pier Composition MaterialsPiers constructed at the first stage of testing were built using 1/10 th scaled AASHTO No.57crushed limestone. The second stage of testing involved constructions of piers of variouscomposition mixes as outlined in Table 19. The groups of aggregate piers at third testingstage were mainly built using manufactured sand and at the last stage cement type I and Kcomposition groups of piers were cast in place according to proportions stated in Table 19.Table 19: Pier mix proportions, compressive strengths, and pier construction detailsPier typeAggregate PierAggregate Pierw/cem. bulbAggregate Pierw/cem. top 0.1m.Loess + fiberLoess +cementLoess + fiber +cementC(1) + C(K)C(1) + C(K) +NS7C(1) + NS7SandLength(mm)LimestoneAggregateProportions of mixture components (%)FibersCementType I,C(1)CementType K,C(K)NS7SandLoessSoilTotalnumber ofliftsMass per310 √ — — — — — — 11 280610 √ — — — — — — 21 280310 √ — 20 — — — — 14 320610 √ — 20 — — — — 23 320310 √ — 18 — — — — 13 310610 √ — 18 — — — — 21 310310 — 1 — — — — √ 15 190610 — 1 — — — — √ 28 190310 — — 7 — — — √ 14 250610 — — 7 — — — √ 23 250310 — 1 7 — — — √ 13 190610 — 1 7 — — — √ 27 190310 — — 85 15 — — — CIP610 — — 85 15 — — — CIP310 — — 83 14 3 — — CIP610 — — 83 14 3 — — CIP310 — — 99 — 1 — — CIP610 — — 99 — 1 — — CIPlift (g)310 — — — — — √ — 15 280610 — — — — — √ — 30 280Legend:σ 28 day - average 28 day compression strength of 76 mm x 152 mm samples (kPa)Aggregate pier w/cem. bulb - pier with bulb portion of the pier containing 20% of cement Type IAggregate Pier w/cem. top 0.1m - pier with top 100mm of the pier containing 18% of cement Type IFiber - polypropylene fibers (19 mm in length), CIP - cast-in-placeσ 28 day(kPa)—9,5309,5309001,9901,99029,7007,61017,660—