Abstract: Majority of the roads within the Niger Delta regions of Nigeria constructed on black cotton soils and are prone to severe cracks, degradation and differential settlement that has led to constant rehabilitation seasonally. The soils fell below standard for its application as road constructional materials. The study experimented on the use of irvinga gabonesis fibre(Bush Mango) to stabilized clay soils with percentage ratios of 0.25%, 0.50%, 0.75% and 1.0%. Preliminary investigations revealed the soils as A – 7 – 6 /CH on the AASHTO classification schemes / Unified Soil Classification System. The soils were dark grey in colors (from wet to dry states) with plastic index of 31.10%, 24.55%, 31.05%, and 32.17% respectively for Iwofe, Chokocho, Ndoni, and Ogbele Roads. The soils has unsoaked CBR values of 7.35%, 7.75%, 8.15%, and 7.85% and soaked CBR values of 6.35%, 6.23%, 7.05% and 5.55%. Unconfined compressive strength (UCS) values of 87.85kPa, 78.75kPa, 105.75kPa and 85.35kPa. Results of compaction test determination showed decreased in MDD values while OMC values increased, both parameters adhered to corresponding percentage increase ratios. Comparably, results indicated increased in CBR altered soils with optimum mixed percentage ratios of 0.7% to soils. Similarly, results of UCS stabilized soils increased with percentages ratio variations. Results showed low values of plastic index with corresponding percentage increased ratios. Entire results showed the potential use of irvinga gabonesis fibre for expansive soils treatment.
Keywords: Clay soils, Irvinga Gabonesis Fibre, CBR, UCS, Consistency, Compaction.
Title: Problematic Clay Soils Modification Using Bush mango Fibre as Stabilizer
Author: Charles Kennedy, Gbinu Samuel Kabari, Letam Leelee Prince
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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