Primeiramente, gostaria de agradecer aos meus pais, Nadir e Evani, e irmãos, André e João Batista, pelo incentivo que se estendeu desde o início da minha etapa estudantil até os dias atuais. Aos meus sobrinhos, Enzo, Kaynã e Vicente (In Memoriam) por me mostrarem o sentido da vida. Ao meu orientador, Prof. Dr. José Tadeu Balbo, por ter se dedicado e se empenhado durante todo o meu mestrado. Foram de extrema valia todos os conselhos, conversas e discussões, pelo seu apoio e confiança e, acima de tudo, por acreditar no meu potencial. Ao Laboratório de Construção Civil do PCC e seus funcionários, em especial o Sr. Adílson. Ao Laboratório de Tecnologia da Pavimentação da EPUSP, em especial ao Dr. Edson de Moura. À Holcim Brasil S/A, eng. José Wanderlei de Abreu e toda a sua equipe, em especial Donizete, Fernando, Chico e Márcio; por disponibilizarem materiais, infraestrutura e mão de obra para a realização das moldagens. À minha banca de qualificação, Prof. Dr. Antonio Domingues Figueiredo e a Dra. Dirce Carregã Balzan, pelos conselhos e válidas considerações feitas na etapa de qualificação. Ao CNPQ pela bolsa de mestrado. Ao Prof. Dr. Carlos Yukio Suzuki, à engenheira Angela e ao engenheiro Caio por ajudarem a sanar várias das dúvidas que tive ao longo do meu mestrado. Aos meus colegas de laboratório, Virgínia, Ester, Bruno e Lúcio pelos auxílios em vários momentos de necessidade. À minha noiva Ana Patrícia pelo apoio em todos os momentos desde que cheguei a São Paulo para iniciar o mestrado. Aos meus amigos de longa data, Abel, Afonso, Renan, Thomaz, entre outros, os quais eu considero como irmãos e me auxiliaram de inúmeras maneiras ao longo de toda a minha vida. Aos antigos companheiros de república, Ciro, Leonardo e Paula, que me auxiliaram na minha adaptação às novas mudanças no início do meu mestrado.

The main goal of this paper is to show the analysis of the permeability characteristics of three different mixes of pervious concrete produced with the variation of the coarse aggregate size. Two different test methods were used to achieve the hydraulic conductivity of the samples: falling head and constant head permeability tests. Based on test results it is concluded that the pervious concrete mixes have shown to be good drainable materials. Besides, it was found that the permeability of the mixtures does not seem to depend on the size and gradation of the coarse aggregate.

No abstract

Widespread adoption and acceptance of pervious concrete systems are dependent on determining the in situ properties of the placement. The porosity of the pervious concrete layer is the dominant variable of the system, affecting durability, hydraulic, and mechanical properties. Current practice has the porosity of the system estimated prior to placement by a fresh concrete density test on the mix from the concrete mixer, and tested after placement by extracting cores and performing a hardened porosity test. This study provides a method for correlating the surface infiltration rate of a newly placed pervious concrete layer and its estimated porosity with simple linear equations. Although not intended to replace standardized acceptance porosity tests, using this existing nondestructive infiltration method for also estimating porosity may readily provide more information on the variable characteristics of an entire pervious concrete slab for correlation to additional studies, performance, and evaluation of installation techniques. The findings also indicate that the standard 300-mm-diameter single-ring surface infiltration test would have similar results to a more involved double-ring imbedded infiltration test. Finally, the research provides information on interpreting the relationship of laboratory measured infiltration rates for single-lift versus double-lift compaction methods, and shows that coring may have impacts on the surface infiltration rate performed on the extracted cores, probably because of coring debris clogging some of the pores.

Loratorial tests with pervious concrete comprised porosity and hydraulic conductivity as well as mechanical parameters as compressive, indirect tensile and bending strengths besides assessing its static and dynamic elasticity moduli. Later, a pervious sidewalk area of 1.0 x 8.65 square meters was built in order to determine the variation of the infiltration rate along time; over such experimental sidewalk, impact deflection tests performed allowed to assess back calculated moduli of the pervious concrete layer, resulting 33% to 13% lower than conventional concretes. A mechanistic analysis allowed to estimate the required thickness of concrete for heavy- and light-traffic areas. Tests disclosed no significant difference among the different concrete mixes, with 25% porosity and 0,1 cm/s permeability. Initial sidewalk infiltration rate of 0.5 cm/s dropped 50% four months after construction. It was verified that pervious concrete thicknesses for trucks and buses use are far higher than conventional concrete pavements.