CBR Laboratory Analysis for Determining the Number of Compaction Tracks to Achieve Field CBR

Abstract

Compaction is the process of grounding the soil by removing air from the pores of the soil mechanically (beaten, crushed and so on) Compaction is carried out with the aim of improving the technical properties of the soil, namely obtaining the densest soil conditions (maximum solid state). In the process of compaction water content also plays a significant role to achieve maximum density value. Water is a lubricant for the soil to help unify the aggregate and remove air in the compaction process. From the results of compaction in the laboratory can be seen how much compaction energy is given and optimum water content (Wopt) to achieve maximum compaction. From the results of compaction in the laboratory can be applied for maximum compaction in the field, from the calculation of compaction energy in labour from the hammer weight of 4.5 kg, 45.7 cm falling height, g = 10 m/s2. The compaction energy is 1134 kg.m/s2. To get the number of compaction paths needed to achieve maximum compaction can be determined from the equipment used, the amount of energy used as an example of a vibro roller capacity of 10500 kg, get the solidification energy 164.1 (kg.m2/s). So the trajectory required vibro roller tool as much as seven trajectories.