Abstract
The research focuses on the use of recycled aggregate (RA), from waste pieces generated during production in precast plants for self-compacting concrete (SCC) manufactured with a double sustainable goal: recycle manufacturing waste (consumption) and improvement of the thermal properties of the manufactured product (energy efficiency). For this purpose, a mechanical study to ensure technical feasibility of the concrete obtained has been conducted, as well as a thermal analysis of recycled SCC specimens of 50 N/mm2 resistance, with different RA doses (0%, 20%, 50% and 100%). The main parameters that characterize a SCC in both states, fresh (slump-flow) and hard (compressive strength), have been tested; also, a qualitative analysis of the thermal conductivity using infrared thermography (IRT) and quantitative analysis with heat flow meter at three temperatures 20 °C, 25 °C and 30 °C have been performed. The results suggest the existence of two different thermal behaviors: concretes with 0% and 20% of RA, and on the other hand concretes with 50% and 100% of RA. It has also demonstrated the validity of the IRT as sampling technique in estimating the thermal behavior of materials having reduced range of variation in parameters.
Highlights
Concrete is the most commonly used construction material anywhere in the world, it is not considered sustainable because of its destructive nature in the consumption of natural resources and the environmental impact after its use
Research is based on three pillars: use of concrete recycled aggregate (RA); analysis of thermal conductivity, as the main parameter to measure energy efficiency; and the use of infrared thermography (IRT) as a qualitative, non-destructive technique for the study of thermal behavior
The results indicate that there must have been a failure in the preparation of the mixture, a fact that was evident with a weight 2% higher than the average weight of type D and a higher density, so it can be deduced that it had a content of fine higher than it should for that mixture
Summary
Concrete is the most commonly used construction material anywhere in the world, it is not considered sustainable because of its destructive nature in the consumption of natural resources and the environmental impact after its use. Research is based on three pillars: use of concrete RAs; analysis of thermal conductivity, as the main parameter to measure energy efficiency; and the use of IRT as a qualitative, non-destructive technique for the study of thermal behavior. With the clear objective of prevention, the Directive 2008/98/EC establishes the legal framework for the treatment of one of the main current environmental problems such as the generation and management of waste from different industries, promoting reuse, and recycling. IRT is widely used as a non-destructive test to evaluate the behavior of a material without destroying it or interfering in its lifespan It can be used in different applications (military, industrial, civil engineering and medicine) in which the variation of the surface temperature may indicate a problem or characteristic of the material [20]. The major disadvantages are radiation reaching the thermography system depends on the temperature, and on the emissivity of the material; a material with emissivity lower than 1 reflects radiation from surrounding objects and may alter the registered temperature; and radiation is attenuated in the atmosphere due to absorption of energy by the particles in suspension and this generates random re-radiation that may produce the results’ alteration (these effects can be considered negligible when the distance between the object and the camera is small)
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