A comparison study of aggregate carbonation and concrete carbonation for the enhancement of recycled aggregate pervious concrete

Tang, Bowen; Fan, Meng; Yang, Zhigang; Sun, Yongshuai; Long, Yuan

doi:10.1016/j.conbuildmat.2023.130797

Cited by 38 publications

(14 citation statements)

References 49 publications

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“…The sample with 40% recycled aggregate exhibited less cracks and higher resistance to load than the other samples. Fan et al [6] used tests to investigate the water purification traits of carbonated RAPC. They determined that recycled aggregate was more beneficial than natural aggregate for contaminant adsorption and micro-organism progression.…”

Section: Previous Studiesmentioning

confidence: 99%

Strength Properties of Pervious Concrete Made with Locally Produced Recycled Coarse Aggregate

Tabsh,

Tamimi,

El-Emam

2024

World Congress on Civil, Structural, and Environmental Engineering

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Pervious concrete is a special type of concrete that addresses critical environmental issues and supports green, sustainable construction. In such concrete, little or no sand is employed in the mix in order to allow the formation of considerable void content leading to high permeability. In this study, seven pervious concrete mixes made with recycled coarse aggregate and containing different amount of natural fine aggregate are tested in the laboratory for their strength. The source of the coarse aggregate is demolished old concrete buildings in the United Arab Emirates. One of the mixes contains 100% natural coarse aggregate without natural sand, another 100% recycled coarse aggregate without natural sand, and the remaining 5 mixes include both recycled coarse aggregate and fine natural aggregate such that the amount of fine-to-coarse aggregate is 1.5-11.7%. Results of the study revealed that that the use of recycled coarse aggregate in pervious concrete without fine aggregate reduced the compressive strength by 36% and tensile strength by 57%. Replacing 4.7% of the recycled coarse aggregate with natural sand in such concrete helped in restoring the compressive strength to the level of the control mix that contained natural coarse aggregate. Likewise, replacing 11.7% of the recycled coarse aggregate with natural sand in concrete mix aided in restoring the split cylinder tensile strength to the level of the control mix that contained natural coarse aggregate. There is a relationship between compressive and tensile strengths, of which a lower bound can be reasonably predicted by models proposed for pervious concrete in the literature. The study confirms the feasibility of using recycled aggregate in pervious concrete mixes if about 10% natural fine aggregate is utilized in the mix as replacement of the recycled coarse aggregate.

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Section: Previous Studiesmentioning

confidence: 99%

Strength Properties of Pervious Concrete Made with Locally Produced Recycled Coarse Aggregate

Tabsh,

Tamimi,

El-Emam

2024

World Congress on Civil, Structural, and Environmental Engineering

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“…In general, the accelerated carbonation results were in accordance with those for porosity related to the ITZ. Indeed, CO 2 penetrates through the concrete's pore network and reacts with the concrete's old and new cementitious matrix [50]. Furthermore, the carbonation rate of the concretes studied was calculated in accordance with standard FD P 18-480 [51] and showed a rate of 1.8 mm/day 0.5 for all SCCs based on RA, (20%RA, 50%RA, and 100%RA) and 0.96 mm/day 0.5 for the reference concrete (0%RA), which, for our mix designs, can be used in a carbonation exposure class of XC4 according to EN 206-1 [29].…”

Section: Accelerated Carbonationmentioning

confidence: 99%

Full Characterization of Self-Compacting Concrete Containing Recycled Aggregates and Limestone

Guessoum,

Boukhelf,

Khadraoui

2023

Materials

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This work deals with the study of self-compacting concretes (SCCs) containing recycled aggregates (RAs) recovered from demolition waste and limestone filler as a partial replacement for natural aggregates (NAs) and cement, respectively. Four mix designs were developed and characterized in both the fresh and hardened states. In the fresh state, the properties studied included slump, sieve stability, and t500 viscosity. In the hardened state, the properties studied were compressive strength and porosity at 15 h and 28 days, thermogravimetric analysis, and durability tests involving freeze–thaw cycles and accelerated carbonation. The results indicate the RAs lead to a decrease in slump flow. However, the substitution rate of aggregate replacement does not affect the compressive strength. This can be attributed to the optimized mix design, resulting in all SCC mixtures achieving the same compressive strength class of 30–35 MPa. As for the durability tests, the incorporation of recycled aggregates modifies the behavior of the concrete during freeze–thaw cycles. Throughout the 300 freeze–thaw cycles, all concrete mixtures exhibited a mass loss accompanied by a slight strain increase, but the materials remained visually intact. Additionally, the carbonation depth is strongly influenced by the rate of aggregate replacement due to changes in the microstructure, particularly in porosity.

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“…The reduction in porosity may be a prevailing physical effect over the chemical effect of reduced buffer capacity. Several authors [ 46 , 47 , 48 , 49 , 55 , 58 , 60 , 61 , 62 , 63 ] described the improved microstructure of mineral carbonated RCA. The reduction in porosity was confirmed in both the attached mortar and the old ITZ and reflected in an overall increased performance [ 54 , 64 , 65 , 66 ].…”

Section: Influencing Factors In Carbonation Ratementioning

confidence: 99%

Unraveling the Interplay of Physical-Chemical Factors Impacting the Carbonation Performance of Recycled Aggregate Concrete

Pico-Cortés,

Villagrán-Zaccardi

2023

Materials

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Recycled aggregate concrete (RAC) includes recycled concrete aggregates (coarse and/or fine) as substitutes for natural aggregates as an approach to achieving a circular economy. Some concerns remain about its performance, including the carbonation resistance. The higher porosity of recycled concrete aggregates is logically a disadvantage, but the analysis must address many other factors. This paper provides an in-depth examination of recent advances in the carbonation performance of RAC. The emphasis is on factors that influence CO2 diffusion and the carbonation rate, e.g., the replacement ratio, source concrete quality, interfacial transition zone features, residual portlandite content, and porosity. The influences of previous treatments, combined action with supplementary cementitious materials, and loading conditions are also discussed. The replacement ratio has a significant impact on the carbonation performance of concrete, but it is also dependent on other factors. During carbonation, the physical effects of the porosity of the aggregate and the physical–chemical effects of the portlandite content in the adhered mortar are particularly important. The residual portlandite is especially significant because it is the primary hydration product responsible for the alkaline reserve for carbonation and the potential pozzolanic reaction, which are per se competing factors that determine the carbonation rate.

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A comparison study of aggregate carbonation and concrete carbonation for the enhancement of recycled aggregate pervious concrete

Cited by 38 publications

References 49 publications

Strength Properties of Pervious Concrete Made with Locally Produced Recycled Coarse Aggregate

Strength Properties of Pervious Concrete Made with Locally Produced Recycled Coarse Aggregate

Full Characterization of Self-Compacting Concrete Containing Recycled Aggregates and Limestone

Unraveling the Interplay of Physical-Chemical Factors Impacting the Carbonation Performance of Recycled Aggregate Concrete

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