Influences on clay fraction of mineralogy in the behavior of soil curves compaction

• Grant number: 16/13696-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2016
• End date: September 30, 2018
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: José Marques Júnior
• Grantee: Renan Radaelli dos Santos
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

The identification of exposed areas to soil compaction can be performed when it is proposed compression curves for soils with different mineralogy, specifically hematite, goethite, kaolinite and gibbsite, identifying the percentage of moisture that determines the maximum compression. The aim of this study is to clarify the behavior of soil compaction in different mineralogical compositions by Proctor test under different moisture contents. The hypothesis is that the mineralogy of the soil, especially the hematite content, goethite, kaolinite and gibbsite influence on the behavior of aggregate stability and compression curves. Kaolinitic soils have greater potential for compaction than gibbsitic soils, they tend to have more stable aggregates. So for kaolinitic soil moisture is less need to condition greater compression or maximum density. Compression curves will be built by Proctor test for soil: Oxisols; Entisol dystrophic. The particle size, soil resistance to penetration and mineralogical composition in four depths (0.0-0.1 m; from 0.1 to 0.2 m; 0.2 to 0.3 m; 0.3 to 0 4 m) will be also evaluated. This study will test the degree of compaction of the soil in six different humidities (6, 12, 18, 24, 30 and 36%) for each soil type and layer.