STUDY OF PERMEABLE CONCRETE

Reference	Presenter	Authors (Institution)	Abstract
09-091	Rosa Cristina Cecche Lintz	Lintz, R.C.(Universidade Estadual de Campinas); Canteras, F.B.(Universidade Estadual de Campinas); Gachet-Barbosa, L.A.(Universidade Estadual de Campinas); Silva, V.F.(Universidade Estadual de Campinas); Teixeira, I.(Universidade Estadual de Campinas);	The chaotic growth of urban centres as a result of the high population concentration has increased the impermeable areas of the soil, bringing disastrous consequences to these regions in the periods of intense rainfall. The permeable paving or draining floors made of concrete are materials that have high porosity and permeability, and which, thanks to their characteristics present as excellent drainage systems preventing the accumulation of rainwater on the ground and allowing water to propagate through the pores of the parts, serving as infiltration devices. The materials used in the manufacturing of draining concrete floors are varied and can use different granulometries aggregates, chemical and minerals additives, Portland cement and water. Permeable floors have been used as coatings in construction of garages, squares, sidewalks and external paths. Due to the physical characteristics that these floors present, such as roughness and high porosity, which lead to a greater permeability, they have been shown as a great option to minimize the effects of floods in big cities.  With the intention of studying the most appropriate composition of concrete drainage floor, in this study different traces of concrete were developed and physical characterization tests of materials which concrete is composed of were carried out. Cylindrical test specimens of 100 x 200mm were firstly cured under a controlled condition of humidity and temperature, and after 28 days, compressive tests were carried out. Hydraulic conductivity or permeability can be calculated by tests that measure the infiltration rate through a structure. This way the specimens were also submitted to permeability tests, using variable charge permeameters, being possible to verify the drainage efficiency of all concrete traces produced.
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