Print Email Facebook Twitter Making bioreceptive concrete Title Making bioreceptive concrete: Formulation and testing of bioreceptive concrete mixtures Author Veeger, M.I.A. (TU Delft Heritage & Technology) Ottele, M. (TU Delft Materials and Environment) Prieto Hoces, A.I. (TU Delft Design of Constrution) Date 2021 Abstract Increased urbanisation will put an increasing strain on our green spaces, which is expected to have a significant effect on our physical and mental health, as well as the health of our ecosystems. As such it is important to integrate more green spaces in our urban fabric. One way of doing this is by making use of so-called bioreceptive concrete on our façades and other structures, which allows for biological growth to take place on the concrete substrate itself, without requiring any additional systems or maintenance. However, the challenge is to create an affordable concrete mixture that is sufficiently bioreceptive for biological growth to take place. As such, in our research we test four possible measures to make concrete more bioreceptive: changing the aggregate to CEC (crushed expanded clay), adding bone ash to the mixture, increasing the wcf (water cement factor) and using a surface retarder on the concrete. Of these measures, changing the aggregate to CEC (p = 0.024), the addition of bone ash (p = 0.022) and the use of a surface retarder (p < 0.001) were found to significantly increase bioreceptivity. Increasing the wcf factor, however, was not found to significantly increase bioreceptivity (p = 0.429). It was also found that whereas it was previously though a pH below 10 is necessary for biological growth to take place, this does not appear to be the case. Although further research under natural conditions is necessary, the creation of an inexpensive bioreceptive concrete looks to be feasible. Subject BioreceptivityBone ashConcreteCrushed expanded claySurface retarderwcf To reference this document use: http://resolver.tudelft.nl/uuid:11c84b91-d5f4-48c4-ac7c-b0cacdff42a4 DOI https://doi.org/10.1016/j.jobe.2021.102545 ISSN 2352-7102 Source Journal of Building Engineering, 44 Part of collection Institutional Repository Document type journal article Rights © 2021 M.I.A. Veeger, M. Ottele, A.I. Prieto Hoces Files PDF 1_s2.0_S2352710221004022_main.pdf 29.35 MB Close viewer /islandora/object/uuid:11c84b91-d5f4-48c4-ac7c-b0cacdff42a4/datastream/OBJ/view