A technical-environmental comparison of hybrid and blended slag cement-based recycled aggregate concrete tailored for optimal field performance

Etcheverry, Juan Manuel; Laveglia, Agustin; Villagran-Zaccardi, Yury Andres; De Belie, Nele

doi:10.1016/j.dibe.2024.100370

Cited by 2 publications

(3 citation statements)

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“…It can be seen from Figure 6 that (1) the strain rate did not change the stress-strain curve shape of the material; the higher the strain rate, the greater the peak stress, the larger the elastic modulus value and the approximate linear growth, which was consistent with the actual test results [30]. (2) In the numerical simulation calculation, the strain was accumulated in the failure unit grid standard during the process of stress bearing of the material, while in the actual laboratory test, the strain rate was too fast, which would have led to the beginning of new failure before the complete extension of the failure in the previous stage. Therefore, the increase in strain rate in the numerical calculation made the peak strain result of the RAC specimen larger.…”

Section: Stress-strain Relationshipsupporting

confidence: 77%

“…Since the overall stress of the material depends on the balance of the aggregate strength, the closer the aggregate strength is, the greater the overall strength of the material will be, and the greater the deviation of the aggregate strength will be, so the overall strength of the material will be affected by the low aggregate strength. (2) The interfacial transition area between recycled aggregate and cement slurry is the first place where the material begins to fail, among which, the interfacial area at the corner point of the aggregate is the most prone to failure due to the phenomenon of stress concentration. With the increase in the regenerated aggregate replacement rate, the area of the final damaged region will also increase.…”

Section: Discussionmentioning

confidence: 99%

“…Recycled aggregate concrete (RAC) technology can realize the reprocessing of discarded concrete and restore some of its original performance. RAC is used as a building material in all aspects of human life [ 1 , 2 , 3 , 4 ]. Not only can it realize the recycling of construction resources and alleviate the pressure of resource scarcity, but it can also reduce the impact of the construction industry on the environment, which can be said to be a multi-benefit [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Research on Macroscopic Mechanical Behavior of Recycled Aggregate Concrete Based on Mesoscale

Yang,

Shang,

Zhang

et al. 2024

Materials

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Recycled concrete is a heterogeneous composite material, and the composition and volume fraction of each phase affect its macroscopic properties. In this paper, ANSYS APDL was used to construct a two-dimensional numerical model of recycled aggregate concrete with different replacement rates of recycled aggregate (0%, 25%, 50%, 75% and 100%), and a uniaxial compression test was carried out to explore the relationship between recycled aggregate content and its macroscopic mechanical behavior. On this basis, the numerical simulation of different strain rates (0.1 s−1, 0.05 s−1, 0.01 s−1, 0.005 s−1 and 0.001 s−1) was carried out. It was found that with the increase in the recycled aggregate replacement rate, the peak stress decreases first and then increases, and the peak strain increases continuously. When the replacement rate of recycled aggregate exceeds 50%, the overall damage area of the material increases rapidly. The strain rate will change the path of the micro-crack initiation and expansion of recycled concrete, as well as the process of damage accumulation and evolution. As a result, the unit area and shape of recycled concrete are different at different strain rates, and the damage degree of each phase material is also different.

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Section: Stress-strain Relationshipsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%