Biofouling e biodeterioração química de argamassa de cimento portland em reservatório de usina hidroelétrica

Abstract

Last decade Brazilian rivers experimented progressive biofouling of Limnopernafortunei communities and Cordylophora caspia hydroids. The microhabitat is so favorable that in around 1.5 years L. fortunei increased from 0.39 to nearby 149,000 units/ m2. Ten Portland cement mortar samples were produced with 1: 3.5: 0.4 dosages and installed for 1 year at Salto Caxias Brazilian Power Plant reservoir in 0.5 m and 1.0 m adeep to investigate the biofouling influence on hydraulic civil structures. SEM, EDS, visual investigation and XRF results indicate none direct chemical interrelationships between L fortunei and the mortar samples. However C. caspia diminished the mortar surface resistance and causea cement paste leaching.