Evaluation on the Mechanical Performance of Low-Quality Recycled Aggregate Through Interface Enhancement Between Cement Matrix and Coarse Aggregate by Surface Modification Technology

Choi, Heesup; Choi, Hyeonggil; Lim, Myungkwan; Inoue, Masumi; Kitagaki, Ryoma; Noguchi, Takafumi

doi:10.1007/s40069-015-0124-5

Cited by 56 publications

(15 citation statements)

References 13 publications

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“…Several studies around the world have been particularly interested in the use of recycled concrete aggregates (RCA) (Choi et al 2016;Yehia et al 2015;McNeil and Kang 2013) and RAP (Okafor 2010;Kolias 1996;El Euch Ben Saïd et al 2014;Roberts et al 1996;Sommer 1994;Topcu and Isikdag 2009;Delwar et al 1997;Huang et al 2006;Hossiney et al 2010;Brand and Al-Qadi 2012;Li et al 1998;Hassan et al 2000;Al-Oraimi et al 2009;Mahmoud et al 2013;Bermel 2011;Mathias et al 2004;Abdel-Mohti et al 2016;Hossiney et al 2010;Brito and Saikia 2013) for the production of new PCC. In fact, using RCA and RAP material in the formulation of PCC permits not only to value a material that is considered as solid waste in many parts of the world, but also to limit the usage of quarry products leading to preserving natural aggregate resources and energy.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of PCC Incorporating RAP

Saïd

Khay

Loulizi

2018

Int J Concr Struct Mater

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Rehabilitation and repair of flexible pavements produce huge amounts of reclaimed asphalt pavement (RAP) material. Using RAP in the formulation of portland cement concrete (PCC) is a technique that is part of a sustainable development approach since it reduces on the consumption of new aggregates and reuses a material that is considered as waste. This paper describes the semi-adiabatic calorimetry test performed on a concrete mix incorporating RAP material as aggregate. Results showed that the cement hydration process is not affected by the presence of asphalt coated on the surface of RAP material. Classical tests (compressive strength, flexural and indirect-tensile strengths, elastic modulus, and free-shrinkage) were also performed on PCC mixes incorporating different percentages of RAP. It was found that as the percentage of RAP increases, the PCC mechanical properties decrease. This is mainly attributed to the presence of voids in the transition zone between the asphalt-coated aggregates and the hydrated cement paste as confirmed by scanning-electron microscope images. Unrestrained shrinkage testing showed statistically insignificant change in shrinkage strain with RAP content. The strength and shrinkage results lead to conclude that as much as 40% of RAP could be incorporated into the formulation of PCC and achieve properties that are acceptable for the construction of rigid pavements.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of PCC Incorporating RAP

Saïd

Khay

Loulizi

2018

Int J Concr Struct Mater

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“…), thus improving the surface properties of RCA and ITZ and enhancing the mechanical properties of the resultant concrete [22][23][24]. There are two basic ways to coat the aggregate-coating in advance before mixing the concrete [25][26][27][28] and coating during the mixing using specific mixing methods. With the exception of standard single-stage mixing, in which the entire mixing process is done in one stage, several mixing approaches are under investigation, such as the two-stage mixing approach (double-mixing approach), in which the entire mixing process is done in two stages, and the three-stage mixing approach (triple-mixing approach), in which the entire mixing process is done in three stages.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Modifications of Recycled Concrete Aggregate on Concrete Properties

Junak

Sičáková

2017

Buildings

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The experiment aims to test the specific way of producing concrete with recycled concrete aggregate (RCA). To reduce its negative impact on the concrete properties, two different ways of treatment of the RCA with geopolymer slurry were applied-coating during the mixing using the specific mixing approach and coating prior to the mixing of concrete. As control samples, a mixture prepared by natural aggregate only and a mixture with RCA that was prepared by standard mixing with no coating process were tested as well. The results of density, total water absorption, and compressive strength in periods of 28, 90, 180, and 365 days of curing are presented and evaluated. Both methods of coating of the RCA with geopolymer slurry allow for the preparation of concrete with properties comparable to those of normal concrete (prepared by standard mixing with natural aggregate); thus, it seems to be a promising way to enhance the rate of RCA application. The positive effect of coating is clearly visible after a longer period of curing (180 days). When comparing the methods of RCA coating, coating directly during the mixing yields somewhat better results; it is also positive from the technological point of view, since the process is simpler in practice.

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“…It is found that the main problem of using RCA is the weak adhered mortar and the interfacial transition zone (ITZ) between the original aggregate and the weak adhered mortar, which distinguishes RCA from the natural aggregate (NA), resulting in a poorer quality concrete (Malesev et al 2010;Henry et al 2011;Qiu et al 2014;Zhang et al 2015d;Mukharjee and Barai 2017). Previous research (Etxeberria et al 2007;Lee et al 2012;Pasandin and Perez 2014;Choi et al 2016) have confirmed that the weak adhered mortar in RCA has some inferior characteristics such as lower density, and higher porosity as well as increased water absorption compared to NA. Moreover, the quality and the amount of attached mortar present, in addition to the weak adhesion between mortar and aggregate, are also major contributing factors to the poor quality of RCA.…”

Section: Introductionmentioning

confidence: 99%

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Shaban

Yang

et al. 2019

ACT

134

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The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. It also has lower strength compared to natural aggregate (NA), and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). These weak zones lead to negative effects on the mechanical properties and durability performance of RAC. In order to utilize RCA in more effectively as aggregate in concrete, it is necessary to improve the quality and enhance the properties of the attached weak mortar. This paper reviews different treatment methods of RCA based on the published research, and systematically analyses the strengths and weaknesses as well as the applicability and limitations of each method. The advantages and disadvantages of each treatment method, in terms of their technical feasibility, efficiency, economic and environmental impacts, are also discussed, in view of facilitating the selection of the most suitable treatment method for RCA. Although most techniques have been examined and trialed under laboratory conditions, further investigations are required to determine the most effective approach for treating RCA, with consideration not only given to the laboratory scale, but also on a commercial production scale.

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Evaluation on the Mechanical Performance of Low-Quality Recycled Aggregate Through Interface Enhancement Between Cement Matrix and Coarse Aggregate by Surface Modification Technology

Cited by 56 publications

References 13 publications

Experimental Investigation of PCC Incorporating RAP

Experimental Investigation of PCC Incorporating RAP

Effect of Surface Modifications of Recycled Concrete Aggregate on Concrete Properties

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

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