Impact of compaction method on mechanical characteristics of unbound granular recycled materials

Abstract

Laboratory testing methods are constantly being developed to simulate true field conditions in controlled laboratory environment. The aim of laboratory testing methods is to reproduce specimens which accurately replicate field performance in terms of mechanical behavior of pavement materials under applied loads.Compaction is the most common soil stabilization technique in ground improvement and pavement construction works. Among the available laboratory compaction methods, impact method followed by the static method are the most commonly used procedures. Since the nature and approach of these two compaction methods is fundamentally different, an investigation on the effect of using these techniques on the mechanical performance of pavement materials prepared by each of these methods is essential, so as to better understand both these compaction methods. In this regard, two types of recycled Construction and Demolition (C&D) materials suitable for pavement applications, being Crushed Brick (CB) and Recycled Concrete Aggregate (RCA) were selected. Laboratory specimens were prepared using the two above-mentioned procedures. Different aspects of geotechnical characteristics of the specimens, including aggregate breakage, changes in soil-water characteristics, stiffness and resilient characteristics, etc., were investigated. The outcomes of this research indicate that the influence of method of compaction must be considered when interpreting the laboratory test results for field design purposes.

Combined Effect of Compaction Methods and Loading Conditions on the Deformation Behaviour of Unbound Granular Material

“…Existing studies [26][27][28][29] have proven that the compaction density and mechanical properties of unbound granular material produced by the VVCM perform closely to what is observed in the field, which is superior to the MPCM because the VVCM results in a similar compaction status to what is observed on construction sites. However, there is little analysis about the effect of compaction methods on the deformation behaviour of unbound granular material in the existing literature.…”

Kil Zeminin Dayanımı Üzerinde Uçucu Kül ve Yüksek Fırın Cürufu Katkılarının Etkisi ve Karşılaştırmalı Analizi

“…UK katkısının, katkı oranı ve kür süresiyle serbest basınç dayanımındaki değişim Şekil 4'de, YFC katkısının, katkı oranı ve kür süresiyle serbest basınç dayanımındaki değişim ise Şekil 5'de sunulmuştur. Zeminlerin arazide maruz kaldığı yükleri ve bu yüklere karşı gösterdikleri davranışları, eşit koşullarda belirlemek ve arazi koşullarını modellemek laboratuvarda yapılan deneylerin asıl amacıdır [30]. Zeminlerin olumsuz yönlerini en uygun maliyetle iyileştirmenin ilk aşaması zeminlerin davranışının bilinmesidir.…”

Compacted Anthropogenic Materials as Backfill for Buried Pipes

“…The oedometric tests are one of the geotechnical tests which give information about mechanical characteristics. One of the parameters that can be driven from the oedometric test is constrained modulus or oedometric modulus ( E oed ) [ 7 , 8 ], which is the ratio of stress for material under vertical axial load in restrained lateral conditions. The E oed parameter is used to predict the deflection and the bulking potential of flexible buried pipes [ 9 , 10 ].…”