Concrete-Based and Mixed Waste Aggregates in Rendering Mortars

Roque, Samuel; Pederneiras, Cinthia Maia; Farinha, Catarina Brazão; Brito, Jorge de; Veiga, Rosário

doi:10.3390/ma13081976

Cited by 13 publications

(4 citation statements)

References 36 publications

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“…Regarding fine recycled aggregates (FRA) from construction and demolition waste (including recycled concrete aggregates, recycled masonry aggregates and mixed recycled aggregates) incorporated in mortars, several studies have been published [6][7][8][9]. However, the incorporation of this type of waste replacing natural aggregates and reducing cement in rendering mortars has not been researched for rendering mortars.…”

Section: Introductionmentioning

confidence: 99%

Reduction of the Cement Content by Incorporation of Fine Recycled Aggregates from Construction and Demolition Waste in Rendering Mortars

et al. 2021

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The construction sector is responsible for one third of the total wastes produced in the EU. Finding solutions for the reuse or recycling of these wastes is one of the major environmental concerns of modern times. The replacement of sand or cement in specific construction materials, such as concrete or mortars, is a possible solution for these wastes’ management. By using construction and demolition wastes in construction materials, namely on buildings, the cycle of circular economy is closed, increasing the life cycle of the wastes in the same sector. In this research, a reduction of cement content in rendering mortars is analysed. This reduction is achieved by a decrease of the cement/aggregate ratio simultaneously with the incorporation of very fine recycled aggregate from construction and demolition waste. Two recycled aggregates were studied: recycled concrete aggregate (RCA) and mixed recycled aggregate (MRA). The fresh and hardened state properties of the mortars were analysed. Several tests were carried out to evaluate the mortars’ performance, such as mechanical strength tests, water absorption tests, drying tests and shrinkage. It was noticed that the incorporation of RCA led to a better behaviour than in the reference mortar, in terms of mechanical strengths and protection against water.

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Section: Introductionmentioning

confidence: 99%

Reduction of the Cement Content by Incorporation of Fine Recycled Aggregates from Construction and Demolition Waste in Rendering Mortars

et al. 2021

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“…There is a lot of mature research on the production of recycled coarse aggregate from crushed concrete waste or reusing solid waste in the subgrade cushion [25,26]. Previous studies have found that the old mortar attached to recycled concrete aggregate negatively affects the mechanical properties and durability of concrete containing recycled concrete aggregate [27][28][29]. The development of production technology and equipment of recycled concrete aggregate contribute to removing most of the old mortar.…”

Section: Introductionmentioning

confidence: 99%

Low-Carbon and Fundamental Properties of Eco-Efficient Mortar with Recycled Powders

et al. 2021

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Using recycled powders from solid waste is accepted as an effective strategy to realize the sustainable development of the construction industry. In our study, the cement was substituted by two kinds of recycled powders, i.e., spontaneous combustion gangue powder (SCGP) and recycled concrete powder (RCP), with a certain replacement ratio of 30%. The experimental variables were mainly the type of replacement powder (e.g., SCGP, RCP, and SCGP + RCP) and the grinding time of RCP (e.g., 25 min, 50 min, and 75 min). The fundamental properties, including mechanical properties, long-term properties, and carbon emission, were analyzed for all the mortar mixtures. Experimental results indicate that incorporation of RCP contributes to enhancing the toughness and dry shrinkage resistance of eco-efficient mortar, while SCGP positively affects the compressive strength and chloride resistance. The grinding process improves the activity of RCP to a certain extent, while a long grinding time leads to fusion and aggregation between powders. Investigation on CO2 emission demonstrates that carbon emission from cement production accounts for the largest proportion, 80~95%, in the total emission from mortar production. Combined with the AHP model, eco-efficient mortar containing 15% RCP ground for 50 min and 15% SCGP displays optimal fundamental properties.

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“…Some thermal and physical properties of WP/ NP compared with sand and cement, Contreras et al[63]; Roque et al[64]; Guendouz et al[65] …”

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confidence: 99%

Investigating the Mechanical and Thermal Properties of Concrete with Recycled Nanoplastics for Enhanced Sustainability

Jassam,

Usman,

Hayder

et al. 2023

ACSM

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Over recent decades, the concrete industry has experienced significant advancements, including the incorporation of recycled waste materials to enhance sustainability and various properties. However, the current literature lacks comprehensive investigations regarding the critical contributions and benefits of Nanoplastics (NPs) in improving concrete's mechanical and thermal properties, such as tensile strength, compressive strength, splitting strength, and thermal characteristics, including thermal stability and insulation. This study aims to investigate the valuable effects of integrating waste materials, particularly NPs, into concrete and to elucidate the impact of NPs on concrete's mechanical and thermal properties. Furthermore, this paper seeks to highlight the positive environmental implications of using NPs in concrete. A comprehensive literature review was conducted to address these aspects and achieve the research objectives. Academic peer-reviewed articles and recently published papers were examined to discuss the practicality and various essential benefits of incorporating NPs into the concrete mix. The review revealed that the use of NPs in concrete leads to improvements in mechanical properties, such as shrinkage, splitting tensile strength, compressive strength, shear resistance, and flexural strength. Simultaneously, the substitution of various NP ratios in concrete enhances thermal resistance, contributing to more energy-efficient structures due to the substantial thermal insulation provided by the plastic incorporation. With respect to environmental aspects, employing waste materials renders the concrete more sustainable, eco-friendly, and cost-effective compared to conventional concrete. Based on the thorough review conducted, which demonstrated the advantageous effects of NPs on concrete performance concerning mechanical, thermal, and ecological measures, it is crucial to expand the available literature on the beneficial evaluations of NPs' contributions to the efficacy and practicality of the concrete mix.

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Concrete-Based and Mixed Waste Aggregates in Rendering Mortars

Cited by 13 publications

References 36 publications

Reduction of the Cement Content by Incorporation of Fine Recycled Aggregates from Construction and Demolition Waste in Rendering Mortars

Reduction of the Cement Content by Incorporation of Fine Recycled Aggregates from Construction and Demolition Waste in Rendering Mortars

Low-Carbon and Fundamental Properties of Eco-Efficient Mortar with Recycled Powders

Investigating the Mechanical and Thermal Properties of Concrete with Recycled Nanoplastics for Enhanced Sustainability

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