Rheology of fresh concretes with recycled aggregates

Faleschini, Flora; Jiménez, C.; Bizinotto, Marilda Barra; Aponte, Diego; Vázquez, E.; Pellegrino, Carlo

doi:10.1016/j.conbuildmat.2014.09.068

Cited by 81 publications

(20 citation statements)

References 27 publications

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“…According to the Bingham model, the yield stress and plastic viscosity of UHPC with different amounts of fine RCA were fitted, and the results are presented in Figure 3. As shown in the figure, both the yield stress and the plastic viscosity of UHPC increased with increasing amounts of fine RCA, which has also been observed in other studies [48,49]. The yield stress of N100R0, N80R20, N60R40, N40R60, N20R80 and N0R100 was 47.412, 65.707, 68.815, 73.327, 82.876 and 108.863 Pa, respectively, which suggests that the yield stress of UHPC increased by 38.59%, 45.14%, 54.66%, 74.80% and 129.61% when the natural aggregate content was replaced with fine RCA at rates of 20, 40, 60, 80 and 100 wt.%, respectively.…”

Section: Resultssupporting

confidence: 87%

Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Huang

Ding

2019

Materials

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The manufacturing process of ultra-high-performance concrete (UHPC) leads to a considerable amount of greenhouse gas emissions, which contribute to global warming. Using recycled concrete aggregates (RCA) to replace natural sand helps to reduce natural resources and energy consumption. In this study, the feasibility of manufacturing UHPC with fine RCA was investigated for the sustainable development of construction materials industry. We aimed to study the rheological properties, autogenous shrinkage, mechanical properties, and pore structure of UHPC with different amounts of RCA. The natural aggregate content was replaced with fine RCA at rates of 0, 20, 40, 60, 80, and 100 wt.%, and the packing density of the mixed fine aggregates in this study was estimated using a linear packing model. It was found that (1) the workability, mechanical properties, and deformation behaviour of UHPC with fine RCA were comparable to or even higher than those of UHPC made of high-quality aggregates; (2) the optimal replacement rate of fine RCA was in the range of 40–60 wt.%, considering the mechanical properties and deformation behaviour of UHPC; (3) the tensile strength, flexural strength, and Young’s modulus of UHPC increased by 6.18%, 12.82%, and 3.40%, respectively, when the replacement rate of fine RCA was 60 wt.%; (4) the maximum packing density of mixed fine aggregates presented a monotonic decreasing trend as the replacement percentage of fine RCA increased. These findings help to encourage and further promote the utilisation of RCA to produce UHPC.

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Section: Resultssupporting

confidence: 87%

Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Huang

Ding

2019

Materials

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“…However, these studies confirm the Bingham behavior of these fresh concretes (Wu, Liu 2015;Wallevik et al 2015;Yahia, Tanimura 2015;Vance et al 2015;Faleschini et al 2014;Choi 2014;Kong et al Fig. 1.…”

Section: Introductionsupporting

confidence: 52%

“…In this context, rheometers adapted to these fluids have been developed: ICAR (Koehler, Fowler 2004;Koehler et al 2006); Two points test (Banfill 2011); IBB (Lacombe et al 1999;Hu, Wang 2010); BML (Faleschini et al 2014;Wallevik, O. H., Wallevik, J. E. 2011); BTRheom (Hu et al 1996); MCR (Jau, Yang 2010). These rheometers can differentiate the rheological behavior of different concretes (Banfill et al 2001;Beaupre et al 2004;Skripkiūnas, Daukšys 2004).…”

Section: Introductionmentioning

confidence: 97%

Design of portable rheometer with new vane geometry to estimate concrete rheological parameters

Soualhi

Kadri

Ngo

et al. 2016

Journal of Civil Engineering and Management

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This paper presents the development of a portable vane rheometer to estimate concrete plastic viscosity and yield stress. The apparatus can be used not only in laboratory but also on construction site. In this study, new blade geometry was proposed to minimize the effect of segregation of concrete during testing, and also to expand the wide range of concrete workability with a slump of approximately from 7 cm to fluid concrete, and concrete with high plastic viscosity such as concrete with mineral additions. The used blade (U shaped and reversed) allows reducing the vibration of the apparatus, and obtaining more stable measurements. The obtained results permit validating the rheometer test procedure and confirmed that the results are reliable, with a low coefficient of variation of 9% for repetitive test and of 5.8% for reproductive tests.

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“…Figure 5 shows the relationship between the residual mortar content (RMC) on RA and the density and water absorption of RA investigated in other studies. There may be differences depending on production processes and the impurities contained in aggregates, in general, as the RMC increases, the specific gravity decreases and the water absorption rate tends to increase [3,13,33,35,36,[38][39][40][41][42][43][44].…”

Section: Recycled Aggregatementioning

confidence: 99%

The equivalent mortar volume method in the manufacturing of recycled aggregate concrete

Kim¹,

Sadowski²

2019

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many studies have observed that the mechanical properties of concrete made of recycled aggregate are worse than for concrete made of natural aggregate; this is mainly due to the mortar that is attached to the recycled aggregate. In literature, an equivalent mortar volume method in the manufacturing of recycled aggregate concrete has been proposed. This method treats the attached mortar as new mortar. The application of this method can reduce the use of natural materials while maintaining mechanical properties and eliminate the additional processes required for the production of recycled aggregates. The aim of this paper is to briefly describe the recent application of this method, present gaps in current research and anticipated directions for further research.

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Rheology of fresh concretes with recycled aggregates

Cited by 81 publications

References 27 publications

Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Design of portable rheometer with new vane geometry to estimate concrete rheological parameters

The equivalent mortar volume method in the manufacturing of recycled aggregate concrete

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