Evaluation of the influence of cement content and polypropylene fibres (PP) in the shear STENGTH of a sandy soil

• Grant number: 18/06329-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: July 01, 2018
• End date: June 30, 2020
• Field of knowledge: Engineering - Civil Engineering - Geotechnical Engineering
• Principal Investigator: Paulo César Lodi
• Grantee: Willian de Brito Giacometti
• Host Institution: Faculdade de Engenharia (FE). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

This work will evaluate the effects that occurs on shear strength of a sandy soil by the inclusion of different sizes and percentages of polyethylene and polypropylene fibers. The soils used will be: (a) sandy soil typical of the Bauru region (SP), (b) clay soil of the Pederneiras region (SP) and (c) silty soil of the Botucatu region (SP). The fibers shall be strips drawn from disposable bottles of lengths of 10, 15, 20 and 30 mm and a width of 1,5 mm. These will be randomly added to the soil in predetermined percentages of 0.25; 0.50; 0.75, 1.0; 1.5 and 2.0%, in relation to the dry mass. Compaction tests (Proctor Normal) will be performed to obtain optimum soil parameters and uniaxial compression. With these values, specimens will be molded to perform direct shear tests in the soil (with and without fibers) in two degrees of compaction (95 and 100%). These tests will be performed in the condition of natural moisture and saturation. This proposal aims to complement research already in progress (Fapesp Processes numbers: 2016 / 09677-1 and 2016 / 18625-5). In this way, it will be possible to verify by means of the comparison of the obtained results, the influence that the dimensions and percentages of the fibers can cause in the shear strength of the evaluated soils.