Naslov
Use of recycled aggregate concrete for energy efficient buildings

Autori
Milovanović, Bojan ; Bagarić, Marina ; Banjad Pečur, Ivana ; Štirmer, Nina

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
3rd R.N. Raikar Memorial International Conference and Gettu-Kodur International Symposium on Advances in Science and Technology of Concrete / Markan, Radhika ; Manjrekar, Surendra - Mumbai : Excel India Publishers, 2018, 164-174

ISBN
978-93-88237-28-4

Skup
3rd R.N. Raikar Memorial International Conference and Gettu-Kodur International Symposium on Advances in Science and Technology of Concrete

Mjesto i datum
Mumbai, Indija, 14.12.2018. - 15.12.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
construction and demolition waste, recycled aggregate, nZEB, ECO-SANDWICH, environmental product declaration, thermal inertia.

Sažetak
The rationale of the research presented in the paper is to use of construction and demolition waste (CDW) as a new resource for constructing sustainable nearly zero energy buildings (nZEBs). Research activities have been carried out in order to determine concrete mixture where recycled concrete and recycled brick aggregate would be used as a replacement of natural aggregate in significant quantity (40%, 50% and 60%). The properties of fresh and hardened concrete would need to satisfy requirements set for constructing buildings from prefabricated wall panel systems. Based on conducted mechanical, durability and thermal testing of recycled aggregate concrete, replacement ratio of natural aggregate by 50% was determined as optimal. Concrete with compressive strength higher than 40 MPa was produced, which is satisfactory from the structural point of view for small buildings, and satisfactory durability properties (decrease of the elastic modulus was less than 8% for RBA concrete, and less than 4% for RCA concrete after 56 freeze-thaw cycles). Concrete mixtures containing RCA and RBA aggregates have 13–27% and 29–40% lower thermal conductivity than the reported literature values and 38 to 70% lower water vapor diffusion coefficient than the literature values. The monitoring results show that the panel attenuates the temperature very well with a time lag of 10h over a period of 25 hours in summer conditions, while in winter the time lag is approximately 6h over a period of 24 hours which noticeably decreases cooling and heating energy demand. Additionally, the monitoring shows significant influence of ventilated air layer on reducing temperature peaks during both winter and summer periods. The environmental impact of the ECO-SANDWICH wall panel is also shown. Research resulted with development of an energy and resource efficient construction product ECO- SANDWICH - ventilated precast concrete sandwich wall panel with integrated formaldehyde-free mineral wool insulation. ECO-SANDWICH wall panel is a benchmark construction product that allows very low energy design buildings ; therefore, it can be coupled with an exigent need to improve energy performance of the building stock in the EU member states. Storage of recycled materials from CDW in concrete and production of a new high quality construction product can add value to CDW and contribute to closing the loop of product lifecycles which is the basis of a circular economy.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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