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Characteristic of Subgrade Soil using Gyratory Compactor

선회다짐기를 이용한 노상토의 다짐특성

  • Lee, Kwan-Ho (Department of Civil & Environmental Engineering, Kongju National University)
  • 이관호 (국립공주대학교 건설환경공학부)
  • Received : 2018.01.25
  • Accepted : 2018.04.06
  • Published : 2018.04.30

Abstract

A gyratory compactor was developed to reflect the field compaction roller, which is commonly used in road construction. Unlike the compaction of the proctor using a conventional impact load, the gyratory compactor simulated the field roller compaction characteristics using the compressive force by the roller weight and the shear force through the rotation of a roller. The purpose of this study was to evaluate the shear stress and density change characteristics during compaction, which are difficult to obtain in the existing compaction process of the proctor, and to utilize it as a basic data for road design. The compaction characteristics of sand and subgrade soils were also analyzed and evaluated using the gyratory compactor. The compaction characteristics obtained using the gyratory compaction are basically the number of gyrations, height of the specimen, compaction density, void ratio, degree of saturation, and shear stress. As the number of gyrations increased, the height of the specimen decreased, the compaction density increased, the void ratio decreased, the degree of saturation increased, and the shear stress tended to increase. The shear stress of the compacted specimens started at 200 kPa in the initial stage of compaction and increased to approximately 330 to 350 kPa at 50 gyrations. The compaction density, degree of saturation and shear stress tended to increase with increasing water content in the same specimens. Compaction using turning compaction has the advantage of measuring the physical properties required for road design, such as density and shear stress, so that more engineering road design will be possible if it is reflected in road design.

Keywords

Gyratory Compactor;Maximum Dry Density;Optimum Moisture Content;Proctor Compactor;Shear Stress

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