COMPACTION CHARACTERISTICS OF AEOLIAN SAND IN LABORATORY AND FIELD FOR ROAD SUBGRADES

This paper takes aeolian sand as a kind of granular matter and studies its compaction characteristics in the view of granular material.According to the results of the laboratory compaction tests,a compaction curve is plotted which is quite different from that of clay and looks like a double hump in shape.The two peaks in the curve mean that aeolian sand can be well-compacted whether it is dry or contented some water and water plays different parts in the compaction process.According to the results of vibrating compaction test,it can be known that it is vibration acceleration and vibration time that affect the transform between Brazil-nut effects and anti-Brazil-nut effects,which also affect the compaction density.There are optimization values for both vibration acceleration and vibration time in that condition.A optimized compaction density can be acquired.Also,field compaction tests were carried out(the amplitude of the machine was 0.4mm and the frequency was 48 Hertz).When the roadbed was compacted 5 times,the degree of compaction was 96.8%and the value of CBR was 25.3,which are quite acceptable according to the current specifications or design of highway subgrades.