Compression and Strain Predictive Models in Non-Structural Recycled Concretes Made from Construction and Demolition Wastes

Teijón-López-Zuazo, Evelio; López-Rebollo, Jorge; Sánchez-Aparicio, Luis Javier; García-Martín, Roberto; Aguilera, Diego González

doi:10.3390/ma14123177

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…Furthermore, considering that the concrete was made of recycled aggregates, a coefficient of variation of about 10% was observed for the compressive and indirect tensile strength and around 16.5% was observed for the modulus of elasticity. This value can be considered acceptable for this particular type of concrete given the greater inherent heterogeneity of recycled aggregates when compared to natural aggregates [ 7 ]. Taking into account these results, it can be stated that the concrete can be used for structural purposes, which is classified as HA-30.…”

Section: Resultsmentioning

confidence: 99%

“…In this sense, the use of recycled concrete has garnered substantial attention across different applications. Given the nature of these compounds, it is essential to know their mechanical properties and limitations in order to determine their suitability in line with specific sample composition [ 5 , 6 , 7 ]. Among the different types of recycled aggregates, prior studies [ 8 , 9 ] have demonstrated the viability of precast concrete in the manufacture of structural elements, providing a sustainable alternative with an adequate performance.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Thermal Efficiency in Water Storage Tanks Using Pigmented Recycled Concrete

López-Rebollo,

Nieto,

Sáez Blázquez

et al. 2024

Materials

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The present work investigated the manufacture of elements such as water tanks from recycled concrete for applications where industries require water heating. This proposal leverages precast rejects for recycled concrete and incorporates colouring pigments. It is expected to contribute to the circularity of construction materials (due to the total replacement of natural aggregates by recycled aggregates) as well as to energy and emissions savings, which are attributed to improved thermal performance driven by the thermal behaviour that the coloration pigment gives to the manufactured concrete elements. To assess the efficacy of the proposed solution, on the one hand, mechanical tests were carried out in tensile, compression and modulus of elasticity, which showed a suitable concrete dosage for HA-30 structural concrete. Simultaneously, in search for a material that would increase the internal temperature of the tanks, thermal tests were carried out in a controlled laboratory environment on samples with different percentages of pigment, and an optimum concentration of 1% was obtained. It was also found that the thermal conductivity remained almost unaffected. Finally, two water tank prototypes were manufactured and tested under real environmental conditions: one with the optimised pigment concentration solution and other (the reference tank) without pigment. The results revealed that the colourised tank with the optimal concentration resulted in an average water temperature increase of 2 °C with respect to the reference tank. Finally, the economic and environmental benefits of this temperature increase were studied for industrial processes requiring water heating with a potential saving of 8625 kWh per month.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Thermal Efficiency in Water Storage Tanks Using Pigmented Recycled Concrete

López-Rebollo,

Nieto,

Sáez Blázquez

et al. 2024

Materials

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“…To prepare the concrete, the compressive strength class had to first be chosen from which the minimum w/c ratio to use was deduced. Then the optimal particle size curve was determined, obtained using a predetermined theoretical curve as a reference (Bolomey’s curve) [ 43 , 44 ].…”

Section: Methodsmentioning

confidence: 99%

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

2021

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The availability of different lithology with which concrete can be packaged could create substantial questions on the differences that they can provide to the same mixture. Different kinds of aggregates were analyzed individually to investigate their main characteristics, which allowed us to package five types of concrete mixtures. These five mixtures were compared to each other through compressive strength values. Furthermore, it was considered microscopically what possible differences could exist between these different mixtures, for example, differences in the cement/aggregate reaction. The chemical characterization of the aggregates, used as the skeleton of the cement mixes, was proposed as an important investigative phase in order to better understand the differences in the geotechnical and physical-mechanical characteristics and to verify the presence of any harmful phases for the durability of the concrete.

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“…This technique can be used for flat specimens in its two-dimensional approach and for specimens with greater curvature through its three-dimensional approach [28]. In particular, the 2D approach employed in this study has been used to obtain the strains and to monitor damage progression [29] in works on materials with similar heterogeneous behaviour, including earth-derived aggregates such as sustainable concretes [30] and cementitious materials that incorporate fibres [31]. Nevertheless, it is a novel technique in the field of earthen materials, and there are few studies of its application due to the sample preparation requirements, although it has proved to be a promising technique for obtaining full-field strains and cracks [32].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Mechanical Properties of Compressed Earth Blocks with Stabilising Additives for Self-Build of Sustainable Housing

López-Rebollo,

Cárdenas-Haro,

Parra-Vargas

et al. 2024

Buildings

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Earth building technologies are increasingly being used to promote a natural and sustainable construction model and to empower self-building in resource-limited areas. This work focuses on investigating the use of different types of stabilising additives in compressed earth blocks (CEBs). To this end, empirical studies and laboratory analyses of earth samples taken from different sites in Ecuador were combined. Once the most suitable earth for use as a building material was determined, four types of CEBs were produced using equipment designed ad hoc to encourage self-building: earth-based, fibre additives, cementitious additives, and additives of other origin. The panels were characterised by means of compression tests to analyse their mechanical behaviour, obtaining the most promising results for the additivated samples with the highest percentage of cement and for the sample containing ground reeds, with a compressive strength of 3.3 MPa and 0.7 MPa, respectively. These samples were then subjected to more extensive tests using digital image correlation to analyse their full field strains and cracks, where the samples stabilised with cement showed a more homogeneous and consistent behaviour. Finally, an economic and comparative study with conventional construction systems was carried out to demonstrate the feasibility of using the proposed earth materials for cleaner and more economical buildings, mainly due to cost savings and lower pollution in terms of transport when using local resources.

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Compression and Strain Predictive Models in Non-Structural Recycled Concretes Made from Construction and Demolition Wastes

Cited by 9 publications

References 39 publications

Enhancing Thermal Efficiency in Water Storage Tanks Using Pigmented Recycled Concrete

Enhancing Thermal Efficiency in Water Storage Tanks Using Pigmented Recycled Concrete

Petrographic and Physical-Mechanical Investigation of Natural Aggregates for Concrete Mixtures

Improvement of Mechanical Properties of Compressed Earth Blocks with Stabilising Additives for Self-Build of Sustainable Housing

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