Carbonation of loaded RC elements made of different concrete types: Accelerated testing and future predictions

Wang, Xiao Hui; Val, Dimitri V.; Li, Zheng; Jones, M. R.

doi:10.1016/j.conbuildmat.2020.118259

Cited by 21 publications

(14 citation statements)

References 36 publications

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“…The obtained results correspond well with the conclusions of Wang et al [ 98 ], who studied the influence of the load on the evolution of carbonation front. Their control sets of samples manifested itself by the reduced resistance to carbonation in the case of the higher replacement level of fly ash (40%).…”

Section: Resultssupporting

confidence: 91%

Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of Long-Term Durability

et al. 2020

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Self-compaction concrete (SCC) is ranked among the main technological innovations of the last decades. Hence, it introduces a suitable possibility for further utilization of supplementary cementitious materials (SCM) in terms of sustainable development. The aim of the work is the assessment of a new approach to binder design, which takes into consideration the activity of the used mineral additive. The proposed approach, which allows a systematic design of a binding system with varied properties of the used mineral additive, was studied on ternary blends consisting of Portland cement (PC), limestone powder and fly ash (FA). The verification was conducted on SCC mixtures in terms of their workability, mechanical properties and the most attention was paid to long-term durability. The long-term durability was assessed on the basis of shrinkage measurement, freeze-thaw resistance and permeability tests including initial surface absorption, chloride migration, water penetration and an accelerated carbonation test, which was compared with the evolution of carbonation front in normal conditions. The durability of studied mixtures was evaluated by using durability loss index, which allow general assessment on the basis of multiple parameters. The carbonation resistance had a dominant importance on the final durability performance of studied mixtures. The experimental program revealed that the proposed design method is reliable only in terms of properties in fresh state and mechanical performance, which were similar with control mixture. Despite suitable results of freeze-thaw resistance and shrinkage, an increasing amount of fly ash in terms of the new design concept led to a fundamental increase of permeability and thus to decay of long-term durability. Acceptable properties were achieved for the lowest dosage of fly ash.

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Section: Resultssupporting

confidence: 91%

Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of Long-Term Durability

et al. 2020

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“…When the cement is replaced by different types of supplementary cementitious materials, tension will cause different extents of acceleration of the carbonation. Ground granulated blast-furnace slag makes the carbonation rate rise faster when concrete is in tension, compared with fly ash [ 39 ].…”

Section: Carbonation In Cracked and Load-damaged Concretementioning

confidence: 99%

Effect of the Mechanical Load on the Carbonation of Concrete: A Review of the Underlying Mechanisms, Test Methods, and Results

2021

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As one of the major causes of concrete deterioration, the carbonation of concrete has been widely investigated over recent decades. In recent years, the effect of mechanical load on carbonation has started to attract more attention. The load-induced variations in crack pattern and pore structure have a significant influence on CO2 transport which determines the carbonation rate. With different types of load, the number, orientation, and position of the induced cracks can be different, which will lead to different carbonation patterns. In this review paper, the carbonation in cracked and stress-damaged concrete is discussed first. Then, literature about the effect of sustained load during carbonation is compared in terms of load type and load level. Finally, the advantages and disadvantages of possible test methods for investigating the effect of sustained load on carbonation are discussed with respect to loading devices, load compensation, and specimen size.

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“…This will include the test results analysis of the carbonation of cracked RC beam segments with and without stirrups and the prediction of the carbonation depth in concrete with load-induced micro-cracks under natural conditions. For this purpose, data collected in accelerated carbonation tests of cracked RC specimens made from three concrete types -OPC concrete, concrete with 30% FA and concrete with 50% GGBS, under bending load [15][16], and the model proposed by Tu and Wang [18] are employed. Then, the repair times of cracked RC members under different exposure conditions is determined.…”

Section: Introductionmentioning

confidence: 99%

Influence of supplementary cementitious material on CO2 balance of cracked RC members in their whole life cycle

Wang,

Tu,

Val

2024

Preprint

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The building construction industry is a significant source of carbon dioxide (CO2) emissions. To reduce CO2 emissions, supplementary cementitious materials are widely used in the concrete. At the same time, during the service life and post-demolition period of the reinforced concrete (RC) members, atmospheric CO2 is absorbed by carbonation. In the present paper, influence of the supplementary cementitious material (SCM) on CO2 balance, i.e., the difference between the CO2 emissions and uptakes, of cracked RC members in their whole life cycle (including the service and post-demolition periods) is evaluated. Three types of concrete — ordinary Portland cement (OPC) concrete and two ‘green’ concretes (one with 30% of fly ash (FA) and the other one with 50% ground granulated blast-furnace slag (GGBS)), are considered. The carbonation depths in the cracked RC members are estimated based on the results of accelerated carbonation tests of cracked RC test specimens made from the same types of concrete. Corrosion initiation times, service life and repair times of the cracked RC beams are determined under different exposure conditions. Finally, the CO2 emissions and absorptions of the cracked RC members are assessed over their whole life cycle. The resulting CO2 balance assessments on cracked RC beams made from the same types of concrete in the test show that, from the view of the whole life cycle, the OPC RC members have a noticeably worse environmental impact than the RC members made from the GGBS concretes; while the RC members from the GGBS concrete are more environmentally friendly than those from the FA concrete.

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Carbonation of loaded RC elements made of different concrete types: Accelerated testing and future predictions

Cited by 21 publications

References 36 publications

Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of Long-Term Durability

Assessment of Rational Design of Self-Compacting Concrete Incorporating Fly Ash and Limestone Powder in Terms of Long-Term Durability

Effect of the Mechanical Load on the Carbonation of Concrete: A Review of the Underlying Mechanisms, Test Methods, and Results

Influence of supplementary cementitious material on CO2 balance of cracked RC members in their whole life cycle

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