Resumo

ZEGARRA-TARQUI, Jorge Luis; SANTOS-DE BRITO, Jeferson  e  DE FATIMA-CARVALHO, Miriam. Runoff on Pavements of Soil-Cement Blocks - an Experimental Boarding. Ing. invest. y tecnol. [online]. 2015, vol.16, n.1, pp.35-47. ISSN 2594-0732.

The article evaluates the reduction of runoff in pavements constructed with rectangular blocks of soil-cement. The tests were conducted in a pilot pavement built with soil-cement blocks, seated in a metal box of 50 cm × 50 cm (area = 2500 cm²), with declivities of 1%, 3% and 5%. Mean intensities of 76.9 mm / I 117.7 mm / h were used, values close to the intensities calculated by intensity-frequency-duration (i-f-d) equation of the city of Salvador, Brazil, for return periods of 2 and 5 years, respectively. The medium runoff coefficient was C = 0.61, this value is close to the coefficient of pavement with rectangular blocks (C = 0.6) and it has a lower value than the coefficient for concrete block pavement (C = 0.78). On the other hand, considering that areas with more than 2500 cm² are constituted by coupling  of area units of 50 cm × 50 cm, the splash losses are part of the runoff, obtaining the coefficient C_{superficial + splashing}, which showed values in the 0.74 to 0.89 range, these values were found close to the coefficient of concrete block pavement (C = 0.78) and below the concrete pavement (C = 0.95), respectively, but factors such as displacement time of runoff on surface, depressions on the surface, roughness of pavement, evaporation and others, should reduce this value. Then, the pavement of soil-cement blocks can be considered in the category of semi-permeable for the area size used.

Palavras-chave : urban hydrology; runoff coefficient; permeable pavement; soil-cement block.