Evaluation of the aggressive potential of marine chloride and sulfate salts on mortars applied as renders in the Metropolitan Region of Salvador - Bahia, Brazil

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:90

Article

Costa, Eduardo A. L.²  Campos, Vdnia P.¹  da Silva Filho, Luiz C. P.³  Greven, Helio A.³ 

[1] Univ Fed Bahia, Inst Chem, Dept Analyt Chem, BR-40210340 Salvador, BA, Brazil

[2] State Univ Feira de Santana, Feira De Santana, BA, Brazil

[3] Univ Fed Rio Grande do Sul, Porto Alegre, RS, Brazil

关键词: Marine salts;    Mortars;    Chlorides;    Sulfates;    Nitrates;   

DOI  :  10.1016/j.jenvman.2008.04.006

来源: Elsevier

【 摘 要 】

In recent years, growing interest has focused on determining the performance of materials and evaluating the service life of structures exposed to various environmental forces. In this context, the determination of the aggressive potential of marine salts on mortars used as external renders is critical. The present study aimed to evaluate the spatial distribution of marine salts relative to distance from the sea. This was done by monitoring the deposition rate of chlorides and sulfates in wet candle sensors, located at nine stations scattered around the Metropolitan Region of Salvador, state of Bahia, Brazil. The study also determined the effectiveness of water-soluble salts at penetrating three different types of mortars of varying cement content via deposition and diffusion. The methodology employed enabled an evaluation of the efficiency of the monitoring sensors' measurement of the aggressiveness potential of local marine aerosol, and determination of the comparative performance of the three mortars tested, from the standpoint of resistance to salt penetration. The type and amount of salts captured both in solution and in powder samples extracted from the mortars were determined by ion chromatography. The analysis of the various types of mortars tested indicated which types are more resistant to the aggressive potential of the region's marine aerosol and the distance from the shore where local buildings are liable to be most strongly affected. (C) 2008 Elsevier Ltd. All rights reserved.

【 授权许可】

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