title: Influence of Crassostrea gigas on the permeability and microstructure of the surface layer of concrete exposed to the tidal zone of the Yellow Sea.
abstract: Concrete exposed to the tidal zone of the Yellow Sea and bearing Crassostrea gigas (CG) with differing areal coverages was investigated for evidence of biologically induced corrosion prevention. The experimental results indicated that both the chloride ion profile and the neutralization depth of the concrete decreased with increasing CG coverage. Moreover, the water absorption rate and the chloride ion permeability of concrete with the original surface intact also declined with increasing degrees of CG coverage. However, the water absorption rates of three concrete samples with 2 mm of the surface layer removed were similar, as was their chloride ion permeability. Mercury intrusion porosimetry tests indicated that CG significantly reduced the pore structure of the concrete surface layer. SEM observation revealed that the CG cementation membrane and left valve were tightly glued to the concrete surface and had a dense structure. Concrete durability indices showed that high CG coverage greatly improved concrete durability.
authors.affiliation: a College of Aerospace and Civil Engineering , Harbin Engineering University , Harbin , PR China.
authors.forename: JianFu
authors.initials: J
authors.lastname: Lv
authors.forename: JiZe
authors.initials: J
authors.lastname: Mao
authors.forename: HengJing
authors.initials: H
authors.lastname: Ba
mesh_terms: D000818:Animals; D002712:Chlorides / Q000737:chemistry; D019245:Compressive Strength; D003252:Construction Materials; D049896:Crassostrea; D008422:Materials Testing; D010539:Permeability; D012623:Seawater; D014867:Water
chemical_list: D002712:Chlorides; D014867:Water
keywords: Crassostrea gigas cementation; chloride ions; corrosion prevention; microstructure; neutralization depth; permeability