title: Bioreceptivity evaluation of cementitious materials designed to stimulate biological growth.
abstract: Ordinary Portland cement (OPC), the most used binder in construction, presents some disadvantages in terms of pollution (CO2 emissions) and visual impact. For this reason, green roofs and façades have gain considerable attention in the last decade as a way to integrate nature in cities. These systems, however, suffer from high initial and maintenance costs. An alternative strategy to obtain green facades is the direct natural colonisation of the cementitious construction materials constituting the wall, a phenomenon governed by the bioreceptivity of such material. This work aims at assessing the suitability of magnesium phosphate cement (MPC) materials to allow a rapid natural colonisation taking carbonated OPC samples as a reference material. For that, the aggregate size, the w/c ratio and the amount of cement paste of mortars made of both binders were modified. The assessment of the different bioreceptivities was conducted by means of an accelerated algal fouling test. MPC samples exhibited a faster fouling compared to OPC samples, which could be mainly attributed to the lower pH of the MPC binder. In addition to the binder, the fouling rate was governed by the roughness and the porosity of the material. MPC mortar with moderate porosity and roughness appears to be the most feasible material to be used for the development of green concrete walls.
authors.affiliation: Department of Construction Engineering, Universitat Politècnica de Catalunya, UPC, Jordi Girona 1-3, 08034 Barcelona, Spain; Magnel Laboratory for Concrete Research, Faculty of Engineering and Architecture, Ghent University, UGent, Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium. Electronic address: sandra.manso@upc.edu.
authors.forename: Sandra
authors.initials: S
authors.lastname: Manso
authors.affiliation: Magnel Laboratory for Concrete Research, Faculty of Engineering and Architecture, Ghent University, UGent, Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium; Laboratory of Microbial Ecology and Technology, LabMET, Faculty of Bioscience Engineering, Ghent University, UGent, Coupure Links 653, 9000 Ghent, Belgium.
authors.forename: Willem
authors.initials: W
authors.lastname: De Muynck
authors.affiliation: Department of Construction Engineering, Universitat Politècnica de Catalunya, UPC, Jordi Girona 1-3, 08034 Barcelona, Spain.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Segura
authors.affiliation: Department of Construction Engineering, Universitat Politècnica de Catalunya, UPC, Jordi Girona 1-3, 08034 Barcelona, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Aguado
authors.affiliation: Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, UGent, Coupure Links 653, 9000 Ghent, Belgium.
authors.forename: Kathy
authors.initials: K
authors.lastname: Steppe
authors.affiliation: Laboratory of Microbial Ecology and Technology, LabMET, Faculty of Bioscience Engineering, Ghent University, UGent, Coupure Links 653, 9000 Ghent, Belgium.
authors.forename: Nico
authors.initials: N
authors.lastname: Boon
authors.affiliation: Magnel Laboratory for Concrete Research, Faculty of Engineering and Architecture, Ghent University, UGent, Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium.
authors.forename: Nele
authors.initials: N
authors.lastname: De Belie
mesh_terms: D003247:Conservation of Natural Resources / Q000379:methods*; D003252:Construction Materials / Q000032:analysis* / Q000382:microbiology; D058086:Microalgae / Q000254:growth & development*; D016062:Porosity
keywords: Bioreceptivity; Chlorella vulgaris; Magnesium phosphate cement; Ordinary Portland cement