Estudo da estabilização granulométrica e química de material fresado com adição de cimento portland para aplicação em camadas de pavimento

Abstract

O Road transport is directly linked to the economic development of a producing region. In Brazil the transport of cargo is concentrated through this modal. Soon, it becomes necessary that the highways present a good state of conservation, since besides contributing with the security, they are of extreme importance in the development of the country. Due to the importance of road transport in the movement of goods and people, it is necessary to invest in the maintenance and recovery of the paved road network. In this sense, researchers are always in search of new alternatives for the better use of materials, reduce costs with restorations and pavement constructions. The lack of aggregates in some regions increases considerably the values of paving services, due to the cost of transportation. In this way it becomes feasible to study the reuse of the material coming from the milling of asphaltic coatings, since in addition to the preservation of the source of natural aggregates it is necessary to search for solutions for final destination of this material. This research sought to evaluate the application of the milled material in base layers and sub-base of pavements with the chemical stabilization using Portland cement and granular materials. For this purpose, characterization tests of the milled material and aggregates were carried out, as well as mechanical tests in the mixture. The milled material comes from the BR-290, the particle size stabilization was done with 60% of milled material and 40% of natural aggregate. The chemical stabilization was done with the addition of different levels of Portland cement CP-IV 32. Mixtures with 2.0%, 3.5% and 5% of cement were produced. For test of resistance to simple compression was used test pieces with dimensions of 10x20cm. 10x6.3 cm specimens were tested for tensile strength tests by diametrical compression and resilience modulus. The specimens were sent to a humid chamber for 7 and 28 days. The analysis of the results showed that the mixture with the content of 5% to 28 reached the resistances prescribed by the existing norms and literature.