Road building in the tropics

Millard, R S

doi:10.1002/jctb.5010120803

Cited by 30 publications

(11 citation statements)

References 3 publications

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“…The nature and relative importance of each of those "soil forming factors" varies in time and space. As far back as the eighteenth century, geologists identified that in warm, moist, temperate and tropical climates water percolating through rock has a strong weathering action (Millard 1993). Chemical reactions increase with an increase in rainfall and temperature, and accordingly soils from the tropics exhibit different engineering properties (Millard 1993).…”

Section: Introductionmentioning

confidence: 99%

“…As far back as the eighteenth century, geologists identified that in warm, moist, temperate and tropical climates water percolating through rock has a strong weathering action (Millard 1993). Chemical reactions increase with an increase in rainfall and temperature, and accordingly soils from the tropics exhibit different engineering properties (Millard 1993). Despite the great effort that has been made by previous works to classify and differentiate tropical soils, a uniform nomenclature /classification system does not exist yet for these soils.…”

Section: Introductionmentioning

confidence: 99%

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Geotechnical, chemical and mineralogical evaluation of lateritic soils in humid tropical area (Mfou, Central-Cameroon): Implications for road construction

et al. 2015

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Increased cost associated with the used of high quality materials have led to the need for local soils to be used in civil engineering works. In this paper, geo-chemical approaches coupled with conventional geotechnical techniques has been used to investigate vertical and lateral peculiar engineering index properties (EIP) of micaschist derived soils from Mfou, Central-Cameroon for their uses in road construction. The X-ray diffraction (XRD) analysis conducted on the soils indicated the absence of swelling clays. The main mineral phases were quartz, kaolinite, goethite, magnetite and chlorite. Geo-chemical results show that the investigated soils are "true laterites" made up of 41 wt.% of Fe 2 O 3 , 35 wt.% of SiO 2 , 21 wt.% of Al 2 O 3 , 1.17 wt.% of K 2 O and 0.05 wt.% of CaO. The results of geotechnical tests suggest that the upper clayey layer (UCL) and bottom mottled clayey layer (MCL) of the weathering profiles are poorly graded soils with EIP (fines particles (FP) of 61 and 63%, plasticity index (PI) of 30 and 31%, Californian Bearing Ratio (CBR) at 95% of 21 and 19%), which do not allow their use as raw materials in road construction whereas, intermediate nodular layer (INL) are well graded soils having EIP (FP of 26%, PI of 26% and CBR of 39%) that meet the specification required for sub-base materials for light traffic roads. The relatively high sesquioxyde present in these residual soils may act as cementing agent, thereby making the compacted soils relatively brittle. The direct shear test results show that the soils have high bearing capacity (cohesion of 62 Kpa and 27.2°angle of internal friction) making them to be useful in slope stability and shallow foundation design. The comparison of the studied soils with some lateritic soils in Sub-Saharan Africa indicates that i) genesis and climatic conditions are potentials factors that influence EIP of lateritic soils, ii) lateritic soils developed under semi-arid conditions exhibits EIP better than those developed under tropicaland sub-tropical conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geotechnical, chemical and mineralogical evaluation of lateritic soils in humid tropical area (Mfou, Central-Cameroon): Implications for road construction

et al. 2015

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“…Incessant occurrence of road pavement deterioration and building collapse, mainly because of their poor geotechnical and mechanical properties has made it imperative for a proper understanding of the geotechnical properties of soils (Garg, 2009). As far back as the eighteenth century, geologists identified that in warm, moist, temperate and tropical climates, water percolating through rock has a strong weathering action (Millard, 1993).…”

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confidence: 99%

Comparative evaluation of geotechnical properties of red tropical soils and anthills from parts of Edo State for road construction

Andre-Obayanju¹,

Imarhiagbe²,

Onyeobi³

2018

Journal of Applied Sciences and Environmental Management

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Geotechnical tests were carried out on a total of six samples of red tropical soils developed over sedimentary and Basement terrains, made up of three soils and three termite hills samples. The soil samples were subjected to geotechnical analyses which included the Particle size analysis, Specific Gravity, Atterberg Limits and Compaction Test to evaluate their suitability for road construction. The results from the analyses showed that soils were well graded(GW) with percentage fines ranging from 28.06 to 57.8%, Specific Gravity ranged from 2.40-2.60, Liquid Limit from 36-48.5% , Plastic Limit ranged from 19-30% , Plasticity Index 15-19% and California Bearing Ratio(unsoaked) from 11-24%. For the termite soils Liquid Limit varies from 26.5-33%, Plastic Limit 19-23%, Plasticity Index 10-12% and California Bearing Ratio 24-40%. The Compaction Test results showed that the Maximum Dry Density (MDD) ranged from 1.44 to 1.65%, 1.6-1.8% and Optimum Moisture Content from 16.3 to 23.8% and 12.5 to 17.8% for soils and termite hill respectively. From the results of the analyses and in accordance with the Federal Ministry of Works and Housing, recommendations for road base, subbase and subgrade, both soils can be used for road construction as subgrade but the termite hill of Igarra indicate a better material because of its higher strength with higher MDD to low moisture content.

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“…Figura 2.24: Sensores láser para medida de la textura (Millard 1993) Figura 2.25. Profundidad media del perfil, MPD, (Millard 1993) Otros equipos determinan otros valores estadísticos, como el RMS, (Root Mean Square)…”

Section: Texturómetros Láserunclassified

“…Profundidad media del perfil, MPD, (Millard 1993) Otros equipos determinan otros valores estadísticos, como el RMS, (Root Mean Square)…”

Section: Texturómetros Láserunclassified

Nuevo procedimiento de ensayo para determinar el coeficiente de pulimento acelerado de mezclas bituminosas

Rodríguez¹

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Road building in the tropics

Cited by 30 publications

References 3 publications

Geotechnical, chemical and mineralogical evaluation of lateritic soils in humid tropical area (Mfou, Central-Cameroon): Implications for road construction

Geotechnical, chemical and mineralogical evaluation of lateritic soils in humid tropical area (Mfou, Central-Cameroon): Implications for road construction

Comparative evaluation of geotechnical properties of red tropical soils and anthills from parts of Edo State for road construction

Nuevo procedimiento de ensayo para determinar el coeficiente de pulimento acelerado de mezclas bituminosas

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