ABSTRACT
ABSTRACT: This paper describes the effectiveness of two strategies in preventing algal growth on aerated autoclaved concrete. A first strategy comprised the use of water repellents in order to affect the bioreceptivity of the material. In the second strategy, products inhibitory to the growth of algae were applied. For the evaluation of these strategies an accelerated growth test was developed. The experimental setup consisted of several units, which allowed for individual testing of several products at the same time. Qualification of algal growth was obtained with image analysis and spectrometric measurements. Both water repellents and biocidal surface treatments resulted in a delayed fouling rate. Nevertheless, complete coverage of these specimens was also obtained after 1 or 2 additional weeks of accelerated tests.
