African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6577

Full Length Research Paper

Improving geotechnical properties of a sand-clay soil by cement stabilization for base course in forest roads

Fabiano Emmert
  • Fabiano Emmert
  • National Institute of Amazonian Research (INPA), Brazil.
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Reginaldo Sergio Pereira
  • Reginaldo Sergio Pereira
  • University of Brasilia (UnB), Brazil.
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Eder Pereira Miguel
  • Eder Pereira Miguel
  • University of Brasilia (UnB), Brazil.
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Fabricia Conceicao Menez Mota
  • Fabricia Conceicao Menez Mota
  • University of Brasilia (UnB), Brazil.
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Humberto Angelo
  • Humberto Angelo
  • University of Brasilia (UnB), Brazil.
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Ailton Teixeira do Vale
  • Ailton Teixeira do Vale
  • University of Brasilia (UnB), Brazil.
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Mayara Paula Oliveira Machado
  • Mayara Paula Oliveira Machado
  • University of Brasilia (UnB), Brazil.
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Mauro Eloi Nappo
  • Mauro Eloi Nappo
  • University of Brasilia (UnB), Brazil.
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Ildeu Soares Martins
  • Ildeu Soares Martins
  • University of Brasilia (UnB), Brazil.
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  •  Received: 28 July 2017
  •  Published: 27 July 2017

Abstract

The study evaluated the chemical stabilization of soils with cement toward application in improving forest roads, as constructive alternative of low cost. The study was carried out with fine soils from the region of Niquelândia-GO, where the sand-clay-silt particle proportion was predominant, and Portland cement CP-II-Z-32 used as a stabilizing agent at 2% under dry soil weight. Geotechnical tests were conducted in different compaction energies (normal, intermediate and modified) and curing periods (1, 7 and 28 days), and the data were analyzed statistically by Analysis of Variance (ANOVA) and Tukey test. The soil-cement mixture presented higher unconfined compressive strength (UCS) than the compacted local soil, reaching a highest value of 650.52 kPa on modified compaction energy. Also, California bearing ratio (CBR) with values ​​of 44.1% in the intermediate compaction energy and 41.7% in the modified compaction energy reached higher values compared to lateritic soil sampled. Soil-cement mixture was prescribed as improved layer for forest road surface, as well as reached indication for subgrade reinforcement material and sub-base in conventional paved roads.

 

Key words: Forest management, chemical stabilizing, lateritic soil, unpaved roads.