Experimental Evaluation on Aggregate Particle Breakage in Unbound Granular Mixture Compaction

Abstract

In order to evaluate the particle breakage percentage and improve fundamental understanding of particle-based mixture construction, this paper presents the laboratory testing results of mineral aggregate mix compaction. In this research, the laboratory compaction tests were conducted under heavy compaction. In preparing the testing samples, aggregate gradations, water contents, and aggregate types were considered. After compaction, CBR (California Bearing Ratio) values optimum moisture contents (OMC) or moisture content (MC) and maximum dry density (MDD) were measured. In order to quantify the particle break percentage, the compacted samples were sieved and analyzed. Furthermore after compaction the changes in gradations could be determined. Through laboratory testing results, connections with design moisture content (DMC) and actual forming moisture content (AFMC) and particle breakage with CBR (California Bearing Ratio) values were established. Besides relationship between design water content and forming water content was cubic function and proctor compaction had a great influence on gradations, particles especially coarse particles reduced a lot while fineness modulus seemed to increase and there was an optimum crushing value under which CBR reached maximum.