Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A study of the penetration of chloride ions in rice-husk ash concrete
A large number of relatively new reinforced concrete structures may require intervention due to problems affecting their durability. Repair and replacement costs of structures account for a considerable share of the total Cost of constructions. Rice-husk ash (RHA) concrete displays lower permeability due to changes in the concrete microstructure, which reduces the vulnerability of this material to the action of aggressive agents. This study assesses concrete durability properties to chloride ions, an aggressive agent. The effect of chloride ions was investigated with tests of compressive strength and chloride penetration. These tests were performed in high initial strength Portland cement concrete (CPV-AR1) modified with the addition of rice-husk ash (RHA) and in pozzolanic Portland cement concrete (CM). The input variables were the water/cementitious ratio (0.30-0.35~0.45-0.60-0.80) and the contents of the rice husk ash additions (0 % - 5 % - 10 % - 1 5 % - 20 %). Results show that the addition of rice-husk ash to M-AR1 concrete had no significant effect on compressive strength properties when compared to the reference concrete. Results for chloride penetration show that the addition of RHA produces an average reduction of 126.6 % on the charge passed. Comparative results of RHA CPV-ARI concrete and CM concrete show that the compressive strength performance of the latter is poorer than the former. Chloride penetration results show that CM concretes displayed a better performance than CPV-AR1 concretes with and without the addition of RHA,
A study of the penetration of chloride ions in rice-husk ash concrete
A large number of relatively new reinforced concrete structures may require intervention due to problems affecting their durability. Repair and replacement costs of structures account for a considerable share of the total Cost of constructions. Rice-husk ash (RHA) concrete displays lower permeability due to changes in the concrete microstructure, which reduces the vulnerability of this material to the action of aggressive agents. This study assesses concrete durability properties to chloride ions, an aggressive agent. The effect of chloride ions was investigated with tests of compressive strength and chloride penetration. These tests were performed in high initial strength Portland cement concrete (CPV-AR1) modified with the addition of rice-husk ash (RHA) and in pozzolanic Portland cement concrete (CM). The input variables were the water/cementitious ratio (0.30-0.35~0.45-0.60-0.80) and the contents of the rice husk ash additions (0 % - 5 % - 10 % - 1 5 % - 20 %). Results show that the addition of rice-husk ash to M-AR1 concrete had no significant effect on compressive strength properties when compared to the reference concrete. Results for chloride penetration show that the addition of RHA produces an average reduction of 126.6 % on the charge passed. Comparative results of RHA CPV-ARI concrete and CM concrete show that the compressive strength performance of the latter is poorer than the former. Chloride penetration results show that CM concretes displayed a better performance than CPV-AR1 concretes with and without the addition of RHA,
A study of the penetration of chloride ions in rice-husk ash concrete
Untersuchung der Chloridpenetration in Reishüllenaschen-Beton
Azevedo, A.A. (Autor:in) / Martins, M.L.C. (Autor:in) / Dal Molin, D.C. (Autor:in)
2001
18 Seiten, 5 Bilder, 12 Tabellen, 24 Quellen
Aufsatz (Konferenz)
Englisch
A Study of the Penetration of Chloride Ions in Rice-Husk Ash Concrete
| British Library Conference Proceedings | 2001
Chloride penetration and carbonation in concrete with rice husk ash and chemical activators
| Online Contents | 2007
Effect of Rice Husk Ash on the Resistance of Concrete Against Chloride Penetration
| British Library Conference Proceedings | 1998
Resistance of Rice Husk Ash Concrete to Carbonation, Acid Attack and Chloride Ion Penetration
| British Library Conference Proceedings | 1997