Effects of Sample Preparation Methods on the Properties of a Cohesive Soil

Abstract

This paper investigates the effects of sample preparation method on the density and California bearing ratio (CBR) of a cohesive soil. The samples were prepared at two moisture contents (dry and wet of optimum) by consolidation and compaction methods with various efforts (energy). The density and CBR of these samples were than measured and compared. Results of these tests indicate that, at dry of optimum, samples prepared by compaction method yielded higher density and CBR than samples prepared using consolidation method. On the other hand, at wet of optimum, the density and bearing capacity of samples prepared using compaction method were lower than samples prepared by consolidation method. It is evident that over-compaction occurred for samples prepared at wet of optimum using compaction method.

Bearing Capacity of Flexible Pavement System Reinforced with Fiberglass Geogrid

“…According to the Unified Soil Classification (UCS) system, these two materials can be classified as well-graded gravel with sand (GW) and silty clay with sand (CL-ML), respectively. Previous study (Yang et al, 2016) has shown that a weak subgrade layer (CBR = 2%) can be obtained by consolidating the clay at a water contain of 18% with a normal stress of 84 kN/m 2 . Therefore, the subgrade layer was prepared by consolidating 1210gm/layer of wet clay in three layers in a 6"-diameter compaction mold using a loading frame as shown in Fig.…”