Effect of Parent Concrete on the Performance of Recycled Aggregate Concrete

Pani, Luisa; Francesconi, Luca; Rombi, James; Mistretta, Fausto; Sassu, Mauro; Stochino, Flavio

doi:10.3390/su12229399

Cited by 40 publications

(14 citation statements)

References 53 publications

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“…Recycled aggregate may become an effective mean for decreasing the impact of construction on the environment, even improving their durability. Furthermore, the combined application of recycled aggregate with mineral waste and alternative bio-natural aggregate [59,60] and structure is an effective approach towards minimalization of the influence of construction on the environment.…”

Section: Discussionmentioning

confidence: 99%

Comparative Analysis of Physical-Mechanical Properties of Natural and Recycled Aggregate Concretes

Sadowska‐Buraczewska¹,

Kujawska²

2021

Adv. Sci. Technol. Res. J.

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Research on the use of construction and demolition waste as recycled aggregate for the production of new concrete has confirmed that they are environmentally friendly and constitute an alternative method of waste management. However, contrary to conventional concrete, no large applications of concrete made with recycled concrete have been made and there is still the literature studies of recycled aggregate properties are different, which indicates the need for further research on the properties of cements from waste. This paper presents and compares the results of a laboratory study on the properties of ordinary concrete (BZ), high-strength concrete (BWW), recycled aggregate concrete (REC). The tensile and compressive strength, modulus of elasticity of these concentrates were marked. The research results proved that the compressive strength of the concrete with recycled aggregate, compared with high-performance concrete, is much lower, but only slightly lower than for ordinary concrete. In turn, the tensile strength of the concrete with recycled aggregate is lower than that of high-performance concrete and ordinary concrete. These values, in the case of the compressive strength are as follows: REC -52MPa; BWW -68MPa; BZ -25MPa, whereas for the tensile strength, they reach: REC -4 MPa, BWW -6 MPa, BZ -5.1 MPa. Statistical analysis showed that the given parameters of the analysed concretes are indeed statistically different. Obtained results indicate that recycled aggregate may be aggregate of standard value and good mechanical properties, even better than of ordinary concrete. The application of recycled aggregate is considered to be a new approach in balanced construction and a superb solution to protect the environment.

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Section: Discussionmentioning

confidence: 99%

Comparative Analysis of Physical-Mechanical Properties of Natural and Recycled Aggregate Concretes

Sadowska‐Buraczewska¹,

Kujawska²

2021

Adv. Sci. Technol. Res. J.

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“…Various studies have been conducted on the feasibility of improving the mechanical properties and durability performance of RAC [134][135][136][137]. Hossain et al [138] conducted a life cycle assessment of RCA and NA production, and concluded that RCA produced from C&D waste reduced non-renewable energy consumption and greenhouse gas emission by 58% and 65%, respectively.…”

Section: Barriers To the Use Of Recycled Aggregate Concrete In Practicementioning

confidence: 99%

Some Remarks towards a Better Understanding of the Use of Concrete Recycled Aggregate: A Review

et al. 2021

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Research on recycled concrete aggregates (RCAs) has been progressively advanced. Beyond replacing natural aggregates with RCA, discussions have been held on the effect of the parent concrete and repeatedly recycled aggregate concrete. Although it has been reported that RCA can be technically used for structural concrete, due to several other factors, RCA is mainly used for sub-bases. Therefore, identifying these factors is the key to promoting the use of RCA. Therefore, this review study first briefly summarizes the physical and chemical characteristics of RCA compared to natural aggregate, and reviews the effects of parent concrete and repeatedly recycled aggregate on next generation concrete. This study also briefly discusses the RCA standards of various countries and the factors that hinder the widespread use of RCA. The results show that there is a correlation in properties between parent concrete and the next generation concrete, and the properties of concrete decrease when RCA is used repeatedly. In addition, on the basis of the literature review, factors hindering the use of RCA were found to be unstable supply and demand, economic feasibility, and negative perceptions.

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“…When the volume fraction of cut virgin carbon fibers, recycled carbon fibers, and brass-plated steel fibers exceeded 0.8% in the cement matrix, fibers would form an effective conductive network, thus increasing the electrical contact bridges [29]. Conductive polymers are also commonly used in cementbased materials to increase their electrical conductivity [33][34][35][36]. Among them, conductive polyaniline is the most widely used due to its easy availability, stable chemical properties, and high conductivity [37].…”

Section: Introductionmentioning

confidence: 99%

Cement-Based Thermoelectric Device for Protection of Carbon Steel in Alkaline Chloride Solution

Liao

Zhang

et al. 2022

Materials

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The thermoelectric cement-based materials can convert heat into electricity; this makes them promising candidates for impressed current cathodic protection of carbon steel. However, attempts to use the thermoelectric cement-based materials for energy conversion usually results in low conversion efficiency, because of the low electrical conductivity and Seebeck coefficient. Herein, we deposited polyaniline on the surface of MnO2 and fabricated a cement-based thermoelectric device with added PANI/MnO2 composite for the protection of carbon steel in alkaline chloride solution. The nanorod structure (70~80 nm in diameter) and evenly dispersed conductive PANI provide the PANI/MnO2 composite with good electrical conductivity (1.9 ± 0.03 S/cm) and Seebeck coefficient (−7.71 × 103 ± 50 μV/K) and, thereby, increase the Seebeck coefficient of cement-based materials to −2.02 × 103 ± 40 μV/K and the electrical conductivity of cement-based materials to 0.015 ± 0.0003 S/cm. Based on this, the corrosion of the carbon steel was delayed after cathodic protection, which was demonstrated by the electrochemical experiment results, such as the increased resistance of the carbon steel surface from 5.16 × 102 Ω·cm2 to 5.14 × 104 Ω·cm2, increased charge transfer resistance from 11.4 kΩ·cm2 to 1.98 × 106 kΩ·cm2, and the decreased corrosion current density from 1.67 μA/cm2 to 0.32 μA/cm2, underlining the role of anti-corrosion of the PANI/MnO2 composite in the cathodic protection system.

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Effect of Parent Concrete on the Performance of Recycled Aggregate Concrete

Cited by 40 publications

References 53 publications

Comparative Analysis of Physical-Mechanical Properties of Natural and Recycled Aggregate Concretes

Comparative Analysis of Physical-Mechanical Properties of Natural and Recycled Aggregate Concretes

Some Remarks towards a Better Understanding of the Use of Concrete Recycled Aggregate: A Review

Cement-Based Thermoelectric Device for Protection of Carbon Steel in Alkaline Chloride Solution

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