carbonation in concrete with recycled concrete aggregates

Carbonation in Concrete with Recycled Concrete Aggregates

Carbonation in Concrete with Coarse Recycled Concrete Aggregates XII DBMC, Porto, PORTUGAL, 2011 dimension of 19 mm; specific gravity of 2.75 g/cm³ and bulk gravity of 1.49 g/cm³. The particle size distribution is between 12.5 and 25 mm. Figure 1 presents an image of the recycled concrete aggregates. Figure 1. Recycled concrete aggregates.

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Carbonation behaviour of recycled aggregate concrete ...

Sep 01, 2015  The literature review has shown that recycled aggregate concrete (RAC) tends to exhibit greater carbonation than a corresponding natural aggregate concrete (NAC), and that the magnitude of the difference depends on several factors related to the use of RA that are discussed in the following sections. 3.1.

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Carbonation treatment of recycled concrete aggregate ...

Nov 01, 2019  Old cement mortars attached on recycled concrete aggregates (RCA) seriously affects the durability of the recycled aggregate concrete (RAC). Revealing the variation of the transport properties of cement mortar after subjecting to accelerated carbonation treatment is crucial with respect to understanding the effects of carbonated RCA on the durability of RAC.

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Carbonation resistance of recycled aggregate concrete ...

Apr 20, 2019  The carbonation resistance of RC can be decreased by particles of recycled aggregate that are either very porous or already carbonated before concrete production. There were no systematic differences in compressive strength and carbonation resistance between dry and pre-saturated aggregates.

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Carbonation behavior of recycled concrete with CO2-curing ...

Jul 01, 2020  The CRA concrete has higher compressive strength and a lower carbonation depth than RA concrete; in addition, the decrease in the carbonation depth is more obvious when the CO 2-curing recycled fine and coarse aggregates are added; for example, the maximum carbonation depth of CRA concrete is approximately 42.5 % lower than that of RA concrete ...

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Durability of recycled aggregate concrete prepared with ...

Nov 01, 2017  With the generation of huge amounts of hardened concrete waste and the depletion of natural aggregate resources, the use of recycled concrete aggregates (RCAs) as a renewable resource in concrete has been promoted and applied widely in many countries , . It has been reported that replacing natural aggregates by 30% RCAs has insignificant ...

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Carbonation behavior of recycled concrete with CO2-curing ...

Jul 01, 2020  The CRA concrete has higher compressive strength and a lower carbonation depth than RA concrete; in addition, the decrease in the carbonation depth is more obvious when the CO 2-curing recycled fine and coarse aggregates are added; for example, the maximum carbonation depth of CRA concrete is approximately 42.5 % lower than that of RA concrete ...

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On carbonation behavior of recycled aggregate concrete ...

Apr 11, 2012  This study tries to reveal the carbonation behavior when recycled coarse aggregates (RCAs) are used to mix new concrete. Six series of tests including 22 groups of recycled aggregate concrete (RAC) specimens were carried out, in which the effects of the water/binder (w/b) ratios, the binder content, the types of mineral admixture, the quality of RCAs, the RCAs replacement and the

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Recycled Concrete Aggregate as Road Base: Leaching ...

page 1 recycled concrete aggregate as road base: leaching constituents and neutralization by soil interactions carbonation and dilution by nautasha gupta a thesis presented to the graduate school of the university of florida in partial fulfillment of the requir ements for the degree of master of science university of florida 2017

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Carbonation of concrete aggregates - Iceberg

Jun 28, 2021  Carbonation of concrete aggregates. Jun 28, 2021. Within the framework of the ICEBERG project, VITO and Orbix are working on an innovative way to produce high-grade recycled concrete aggregate assuring the quality of the RCA. Jef

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Improving properties of recycled concrete aggregates by ...

SCMT4 Las Vegas, USA, August 7-11, 2016 Improving properties of recycled concrete aggregates by accelerated carbonation Zengfeng ZHAO* 1,2, Sébastien REMOND 2, Denis DAMIDOT 2, Luc COURARD 1, Frédéric MICHEL 1 1ArGEnCo Department, GeMMe Building Materials, University of Liège, Belgium (E-mail: [email protected], [email protected], [email protected])

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(PDF) Recycled aggregates in concrete: a performance ...

Recycled aggregate performance requirements in order to achieve concrete within a given w/c correction factor range of RU-N concrete Aggregate characteristic The w/c reduction factor to produce equivalent performing concrete to RU-N concrete > 0.95 > 0.9 > 0.8 Maximum LA coefficient 29 40 55 Minimum density, SSD: kg/m3 2500 2375 2150 Maximum ...

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Performance Enhancement of Recycled Concrete Aggregates ...

the recycled crushed stone concrete aggregate (C-RCA) was re- trieved from concrete beams with compressive strength of 50 MPa. The gravel from a river was crushed and used as the control find

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is crushed concrete the same as cabc

Generally, carbonation of concrete made with crushed concrete aggregate is higher than concrete with natural aggregate, especially if the recycled aggregate suffered carbonation previously. Similarly, rate of reinforcement corrosion in concrete produced using recycled aggregate is greater than conventional concrete. More

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玄武岩纤维对再生混凝土抗碳化性能的影响

采用快速碳化的方法研究了玄武岩纤维 (BF) 掺量和再生粗骨料 (RCA) 取代率对再生混凝土 (RAC) 抗碳化性能的影响,实测了3 d、7 d、14 d、28 d的碳化深度,对随碳化天数的增加,碳化深度和BF掺量、碳化深度和RCA取代率之间的关系进行了分析。结果表明,RAC的碳化与天然混凝土 (NAC) 类似,其碳化深度

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Infrastructures Free Full-Text Cradle-to-Gate Life ...

14 小时前  Recent research reports the use of materials such as calcined clay, marble dust, and granite dust as PC replacements for improving the sustainability of concrete production [7,8].Utilizing industrial wastes, bio-wastes, and agro-wastes with alternative activations such as alkali-activation and carbonation has been performed in various applications [9,10,11].

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Search results for: Ready-mixed Concrete

The present article describes the limits of using recycled concrete aggregate (denoted as RCA) in the top layer of concrete roads. The main aim of this work is to investigate the possibility of reuse of recycled aggregates obtained by crushing the old concrete roads as a building material in the new top layers of concrete pavements.

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Concrete - Wikipedia

Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. In the past, lime based cement binders, such as lime putty, were often used but sometimes with other hydraulic cements, such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (named for its visual ...

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Carbonation behaviour of recycled aggregate concrete

1 Carbonation behaviour of recycled aggregate concrete R. V. Silva1, R. Neves2, J. de Brito3 and R. K. Dhir4 1 PhD student in Civil Engineering, CERis-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal; e-mail: [email protected] 2 Professor, CERis-ICIST, Barreiro Technology School, Polytechnic Institute of Setúbal, R. Américo da Silva

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Carbonation Behavior of Repeated Recycled Fine Aggregate ...

Jan 02, 2019  Carbonation resistance is an important factor affecting the durability of concrete, and the carbonation behavior of structural concrete become more complex under loading. In order to investigate the feasibility of utilizing Recycled Fine Aggregate (RFA) in structural concrete under a coupling of bending load and carbonation, two generations of repeatedly Recycled Aggregate Concrete (RAC1

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Recycled Concrete Aggregate as Road Base: Leaching ...

page 1 recycled concrete aggregate as road base: leaching constituents and neutralization by soil interactions carbonation and dilution by nautasha gupta a thesis presented to the graduate school of the university of florida in partial fulfillment of the requir ements for the degree of master of science university of florida 2017

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Performance Enhancement of Recycled Concrete Aggregates ...

Nov 11, 2015  The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste.

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Recycled Aggregates - Portland Cement Association

The natural process of carbonation occurs in all concrete from the surface inward. In the process of crushing concrete to create recycled concrete aggregates, areas of the concrete that have not carbonated are exposed to atmospheric carbon dioxide. The LEED ® Green Building Rating System recognizes recycled concrete in its point system. Credit ...

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Empirical modelling of CO 2 uptake by recycled concrete ...

Jul 04, 2017  In order to assess the potential CO2 capture ability of recycled concrete aggregates (RCAs) subjected to accelerated carbonation, an empirical prediction model has been developed in relation to carbonation conditions and the characteristics of RCAs. In this study, two sources of RCAs were used: RCAs from a designed concrete mixture and RCAs obtained from crushing of old laboratory concrete

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Reducing the Carbonation Zone and Steel Corrosion Zone ...

May 05, 2021  The optimization of mixing processes is an effective approach for strengthening the microstructure of the interfacial transition zone (ITZ) in recycled aggregate concrete (RAC). This study used iron oxide to distinguish between residual mortar (RM) and added mortar (AM) in RAC using the normal mixing method (NMM), two-stage mixing method (TSMM ...

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Opportunities and limitations of concrete recycling ...

Unlike concrete based on natural aggregates, recycled-aggregate concrete contains two types of cement paste: the “new” paste creating concrete strength and the “old” paste whose parameters – such as its composition, water/cement ratio and degree of carbonation – are unknown. In addition, such concretes contain the “old” aggregates whose origin and properties are usually unknown ...

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(PDF) Recycled aggregates in concrete: a performance ...

Recycled aggregate performance requirements in order to achieve concrete within a given w/c correction factor range of RU-N concrete Aggregate characteristic The w/c reduction factor to produce equivalent performing concrete to RU-N concrete > 0.95 > 0.9 > 0.8 Maximum LA coefficient 29 40 55 Minimum density, SSD: kg/m3 2500 2375 2150 Maximum ...

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is crushed concrete the same as cabc

Generally, carbonation of concrete made with crushed concrete aggregate is higher than concrete with natural aggregate, especially if the recycled aggregate suffered carbonation previously. Similarly, rate of reinforcement corrosion in concrete produced using recycled aggregate is greater than conventional concrete. More

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Performance of Recycled Concrete Aggregates: A New ...

Apr 15, 2021  Performance of Recycled Concrete Aggregates: A New Study. Posted on April 15, 2021. It is a basic axiom of environmental stewardship. When possible, use old stuff to make new stuff. The same is true with concrete aggregates. Mixes are more sustainable when recycled concrete aggregate (RCA) replaces natural aggregates, at least to a degree.

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Home - FastCarb

Context. The FastCarb project (Accelerated carbonation of recycled concrete aggregate – fastcarb) is the outcome of the coming together of two observations. First, the production of cement is a major source of global CO2 emissions, accounting for 5-7% of the total. Approximately two-thirds of these emissions are due to the ...

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玄武岩纤维对再生混凝土抗碳化性能的影响

采用快速碳化的方法研究了玄武岩纤维 (BF) 掺量和再生粗骨料 (RCA) 取代率对再生混凝土 (RAC) 抗碳化性能的影响,实测了3 d、7 d、14 d、28 d的碳化深度,对随碳化天数的增加,碳化深度和BF掺量、碳化深度和RCA取代率之间的关系进行了分析。结果表明,RAC的碳化与天然混凝土 (NAC) 类似,其碳化深度

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