Abstract
This investigation intends to analyse the thermal performance of concrete with recycled aggregates (RA) from construction and demolition waste (CDW) collected from several locations in Portugal. A total of 17 concrete mixes were analysed by means of thermal conductivity tests. Firstly, the composition and characteristics of the aggregates (natural and recycled) used in the production of the concrete mixes were analysed thoroughly, by means of several physical and chemical tests. Later, in order to evaluate the thermal behaviour of the mixes, several tests were performed and their results analysed, both on the fresh-state (slump with the Abrams cone test, density and air content) and the hardened state (compressive strength and thermal conductivity). The analysis of the thermal behaviour showed that the use of RA improves the thermal performance of the concrete mixes. The extent of this change was shown to be quite variable depending on the origin of the RA used.
Highlights
According to data presented by the United Nations, in 2015 the world population was about7.3 billion, and was expected to reach 9.7 billion by 2050 [1]
This author found that the use of 10% of concrete recycled aggregates (RA) and 10% rubber RA reduces the thermal conductivity of the recycled aggregate concrete (RAC) by 32% in comparison with that of natural aggregate concrete (NAC)
It can be concluded that, according to the compressive strength test carried out on cubic specimens, the NAC mix produced belongs to strength class C35/45, which is higher than that expected since this concrete mix was designed for the target strength class C30/37
Summary
According to data presented by the United Nations, in 2015 the world population was about. The specimens were cured in the laboratory in water at a temperature of 20 ± 2 ◦ C for 28 days This author found that the use of 10% of concrete RA and 10% rubber RA reduces the thermal conductivity of the recycled aggregate concrete (RAC) by 32% in comparison with that of natural aggregate concrete (NAC). The specimens were cured in the standard condition of temperature and relative humidity for 28 days (20 ± 2 ◦ C and 95%, respectively) Regarding the former, the study showed that the thermal conductivity of RAC decreases with the increase of aggregate replacement ratio. An investigation of the thermal behaviour of concrete with RA from CDW was performed by analysing the results yielded by the thermal conductivity test. A structural solution with a reduced thermal conductivity decreases the environmental impact by improving the energy performance of the building [18]
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