Influence of selected mineral additives on properties of recycled aggregate concrete (RAC) considering eco-efficiency coefficients

Zawal, Daniel; Grabiec, Anna M.

doi:10.1016/j.cscm.2022.e01405

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…In this case, the combined action was greater than the sum of the separate effects, revealing notable differences between predictions based on accelerated tests and results from natural exposure. In general terms, the performance of FA concrete concerning carbonation should be weighed against the reduction in environmental impact achieved by using reduced clinker factors, and this balance is in general beneficial for FA concrete [ 87 ].…”

Section: Combined Action With Supplementary Cementitious Materials (Scm)mentioning

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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Section: Combined Action With Supplementary Cementitious Materials (Scm)mentioning

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) is a new type of concrete, which uses recycled aggregates taken from waste concrete to replace natural aggregates in the mix proportions of natural aggregate concrete (NAC) partially or entirely 1 . RAC can realize the recycling of waste concrete, reduce the mining of natural resources and construction waste landfill, and has broad engineering application prospects 2,3 . Compared with natural coarse aggregate (NCA), recycled coarse aggregate (RCA) has more edges and corners, and a great deal of old mortar attached on its surface 4,5 .…”

Section: Introductionmentioning

confidence: 99%

“…1 RAC can realize the recycling of waste concrete, reduce the mining of natural resources and construction waste landfill, and has broad engineering application prospects. 2,3 Compared with natural coarse aggregate (NCA), recycled coarse aggregate (RCA) has more edges and corners, and a great deal of old mortar…”

mentioning

confidence: 99%

Flexural stiffness of recycled aggregate concrete beams under combined effect of load and steel corrosion

Wang

Qin

2023

Structural Concrete

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Since reinforced concrete members suffer from different types of loads during their service life, the steel bars embedded in reinforced concrete members can be easily corroded in chloride‐laden environment. To investigate the influence of combined effect of load and steel corrosion on the flexural stiffness of recycled aggregate concrete (RAC) beams, 12 RAC beams were prepared and tested. The effects of load level (i.e., the ratio of the load applied to beams to the ultimate load) and recycled coarse aggregate (RCA) replacement ratio (i.e., the ratio of RCAs to replace natural coarse aggregates) on the internal force arm coefficient of cracking cross‐section, the elastoplastic resistance moment coefficient of cross‐section, and the strain incongruity coefficient of corroded tensile steel bars were analyzed, and a calculation model for flexural stiffness of RAC beams under combined effect of load and steel corrosion was established. The results showed that when the ratio of bending moment to ultimate bending moment of the pure bending part of beams was within 0.55–0.80 and the average mass loss of tensile steel bars was less than 3.23%, 0.85 could be adopted as the internal force arm coefficient of cracking cross‐section. The elastoplastic resistance moment coefficient of cross‐section was approximately a constant when the corroded RAC beams were in the service stage, while it increased obviously with the load level. There was a strong linear relationship between strain incongruity coefficient and average mass loss of tensile steel bars during the service stage of corroded RAC beams, and the strain incongruity coefficient increased linearly with the load level. The calculated values of the model of flexural stiffness proposed in this paper were in reasonable agreement with the experimental values.

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The Effect of Pozzolanic Waste as Cement Substitute on the Properties of Cement Mortar and Resistance to Alkali-Silica Reaction

Nagrockiene

2024

Ceramics - Silikaty

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Influence of selected mineral additives on properties of recycled aggregate concrete (RAC) considering eco-efficiency coefficients

Cited by 4 publications

References 33 publications

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

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

Flexural stiffness of recycled aggregate concrete beams under combined effect of load and steel corrosion

The Effect of Pozzolanic Waste as Cement Substitute on the Properties of Cement Mortar and Resistance to Alkali-Silica Reaction

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