A study of aggregates behaviour with geotextile interface using MBR mould / Anuar Abdullah

The objective of this study is to investigate the degradation behaviour of aggregates by using the MBR (Modified Bearing Ratio) mould with a geotextile interface. The MBR mould with dimensions of 4OO mm diameter and 5OO mm high is used. The mould is separated into two halves of 25O mm height each. The large size of mould is used to reduced the confining effect of a mould on the behaviour of aggregates under test. The study was done in dry condition. Granite aggregates were used throughout the study. The aggregates used are of three different gradations i.e. well graded» uniformly graded and gap graded. Compaction of the aggregates were carried out by using the 2. S kg rammer with a drop height of 3OO mm and the 4.5 kg rammer with a drop height of 45O mm. The geotextile used as an interface used was the DUPONT 34O7 non-woven type. The geotextile was placed at the centre of mould with the different gradations of aggregates tested filling the upper and lower half of the MBR mould. The resulting degradation behaviour of the aggregates upon compaction was determined from the resulting grain size distribution curves.