A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Bioreceptivity optimisation of concrete substratum to stimulate biological colonisation
The lack of green areas in cities is caused by the increase in population and the urbanisation process. Therefore, the solution to increase the urban green spaces lies in their inclusion on structures surfaces. However, existent systems present several disadvantages in terms of installation and maintenance costs, low integration with the structure, extra loads, limitations in their use in rehabilitation, and others. This PhD work aims to provide a first approach to the possibility of using a structure’s surface as biological substratum. Bioreceptivity is the term which defines the ability of a material to be colonised by living organisms. Therefore, bioreceptivity of cementitious materials can be modified by adapting the mix design. Three main properties were considered in this work, including both chemical and physical properties, which are the pH, the porosity and the roughness of mortars. For that purpose, different mixtures were designed by modifying the hydraulic binder (Ordinary Portland Cement and Magnesium Phosphate Cement), the aggregates size (0/2 mm and 2/4 mm), the water to cement ratio (6 different ratios) and the amount of cement paste (6 different contents). After this first stage, the evaluation of the colonisation of those samples was carried out under both laboratory and environmental conditions. Overall, the results of this doctoral research demonstrated the feasibility of using cementitious materials as biological substratum. The Magnesium Phosphate Cements used open the perspective to further research on the aforementioned topic.
Bioreceptivity optimisation of concrete substratum to stimulate biological colonisation
The lack of green areas in cities is caused by the increase in population and the urbanisation process. Therefore, the solution to increase the urban green spaces lies in their inclusion on structures surfaces. However, existent systems present several disadvantages in terms of installation and maintenance costs, low integration with the structure, extra loads, limitations in their use in rehabilitation, and others. This PhD work aims to provide a first approach to the possibility of using a structure’s surface as biological substratum. Bioreceptivity is the term which defines the ability of a material to be colonised by living organisms. Therefore, bioreceptivity of cementitious materials can be modified by adapting the mix design. Three main properties were considered in this work, including both chemical and physical properties, which are the pH, the porosity and the roughness of mortars. For that purpose, different mixtures were designed by modifying the hydraulic binder (Ordinary Portland Cement and Magnesium Phosphate Cement), the aggregates size (0/2 mm and 2/4 mm), the water to cement ratio (6 different ratios) and the amount of cement paste (6 different contents). After this first stage, the evaluation of the colonisation of those samples was carried out under both laboratory and environmental conditions. Overall, the results of this doctoral research demonstrated the feasibility of using cementitious materials as biological substratum. The Magnesium Phosphate Cements used open the perspective to further research on the aforementioned topic.
Bioreceptivity optimisation of concrete substratum to stimulate biological colonisation
2014-01-01
Theses
Electronic Resource
English
DDC:
710
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