Mechanical properties of circular concrete made with 100% recycled aggregates from construction and demolition waste

Fagotti, Francesco (2019) Mechanical properties of circular concrete made with 100% recycled aggregates from construction and demolition waste. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria per l'ambiente e il territorio [LM-DM270], Documento full-text non disponibile
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Abstract

Nowadays, one of the main focuses of the concrete industry is to have environmental friendly buildings to reduce the relentless rise of GHG emissions. The majority of energy and GHG emissions embodied in concrete are due to use of cement and it is responsible for more than 50% of the CO2-emission. This research has been held in the Faculty of Civil Engineering and Geosciences of the of Delft and it concerns the mechanical properties of circular concrete, which is made of 100% recycled aggregates from construction and demolition waste. This investigation is placed within a project about particle packing technologies and the objective of the latter is to optimize the particle size distribution of aggregates and understand the compaction of concrete made of recycled aggregates. Particle size optimization is aimed to improve the density of concrete made of regularly packed aggregates and the distribution of voids thereby improving its sustainability and strength, leading to considerable CO2 reduction. Three recipes have been designed to employ different types of aggregates. The water to cement ratio of recipes was adjusted based on the magnitude of the slump. In particular, recycled aggregates (<12mm) and natural aggregates of different sizes (<12mm and <16 mm) are used. The role of maximum aggregates size and effect of complete substitution of natural aggregates with recycled aggregates has been studied. The recipes have been casted by varying the duration of vibration in order to understand the role of vibration on the compressive strength and the distribution of air bubbles inside the concrete. Results indicate that the duration of vibration was observed to be critical depending on the type and size of aggregate. Despite direct relation of vibration and internal pores, the impact seems to be negative beyond some time. Meanwhile, the compaction and mechanical property of concrete made of recycled aggregates need more vibration compared to natural aggregates.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Fagotti, Francesco
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Ingegneria per l'ambiente e il territorio
Ordinamento Cds
DM270
Parole chiave
Circular concrete,Recycled concrete
Data di discussione della Tesi
15 Marzo 2019
URI

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