STABILIZATION OF CLAY SOIL USING A-3 SOIL IN SUBGRADE MATERIALS

construction Technology and Management

The aim of this paper work is stabilization of clay soil using A-3 soil in subgrade material of Arba Minch - Wolaita Sodo main road to Zefine town by taking the three soil samples test peats, because this road giving transportation purpose for the community with continuous maintenance on some part of the road; thus, geotechnical characterization and stabilization of Problematic soil is very important. To achieve these objectives three soils sample pits were selected from different representative parts of the existing road at 1km interval. To understand the basic characteristics of the sub grade soil, such as field dry density, natural moisture content, particle size distribution, specific gravity, Atterberg limits (LL and PL), compaction (OMC and MDD), CBR and CBR swelling potential tests were concerned. The test results showed that the NMC ranges from 14.25% to 15.86%, the field dry density ranges from 1.67g/cc to 1.69g/cc, percentage finer ranges from 75.08% to 77.26%, LL ranges from 56.65% to 60.27%, PI ranges from 37.27% to 39.02%, GI ranges from 28 to 31, OMC ranges from 16.46 % to 17.65 %, MDD ranges from 1.74 g/cc to 1.80g/cc, CBR ranges from 2.05% to 2.46% and CBR swell ranges from 3.20 % to 3.66%. Based on these results the study area was characterized as clay soil, and for the soil classification under A-7-6 according to AASHTO M145 soil classification system. From the three test pits samples (from TP1 to TP3) were unsuitable to use as a subgrade material for pavement construction based on [10] manual specification; thus, for the unsuitable subgrade soils, stabilize by mechanical method of stabilization by A-3 soil, with different percentages ratio (10% , 15% and 20% of locally available selected material that is A3 soil) by weight, were used to get appropriate mixing ratio, finally it was found that 20% mixing of A-3 soil were efficient to use those as a subgrade material.

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