Influence of recycled coarse aggregates on permeability of fresh concrete

Souche, Jean-Claude; Devillers, Philippe; Salgues, Marie; Diaz, Eric Garcia

doi:10.1016/j.cemconcomp.2017.08.002

Cited by 22 publications

(8 citation statements)

References 30 publications

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“…Nevertheless, due to the use of RCCA without any treatment in non-pozzolan RAC, it is possible for RCCA to release the absorbed water causing higher w/c around ITZ of RCCA and lead less compacted and weaker ITZ. A similar finding was noted by Souche et al (2017). The proper effect of the use of 10% and 15% of SF caused all of the CC and RAC cases to place at the quality with low risk of chloride ion penetration.…”

Section: Rapid Chloride Ion Penetration Test (Rcpt)supporting

confidence: 80%

Evaluating the durability of recycled concrete made of coarse recycled aggregate concrete containing silica-fume and natural zeolite

Jalilifar

Sajedi

Toosi

2020

rdlc

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This experimental study evaluates the durability of recycled aggregate concrete (RAC) containing silica-fume (SF) and natural zeolite (NZ). For this purpose, four levels of recycled coarse concrete aggregates (RCA) were replaced with natural coarse aggregates (NCA). To compare the effect of pozzolans, three levels of SF (5%, 10%, and 15%) and three levels of NZ (10%, 20%, and 30%) were replaced with cement. To evaluate the durability of RAC, 28 mixed designs were made and the following were measured: compressive strength (CS), water absorption by immersion (WA by immersion), water absorption by capillary (WA by capillary), electrical resistance (ER), electrical conductivity (EC) and rapid chloride penetration test (RCPT). The results indicated that WA by immersion and WA by capillary of RAC increased with enhanced RCA incorporation. On the other hand, the pozzolanic reaction of 10% of SF and 10% of NZ decreased capillary pores and structural weakness of full-scale RAC. However, due to the internal chemical changes of RAC, contrary to the WA by immersion and WA by capillary, compared to conventional concrete (CC), a lower EC and unchanged ER values of RC100 containing pozzolans were seen. The scanning electron microscopy (SEM) revealed that compared to NZ, a 10% of SF significantly improved the microstructure of full scale RAC.

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Section: Rapid Chloride Ion Penetration Test (Rcpt)supporting

confidence: 80%

Evaluating the durability of recycled concrete made of coarse recycled aggregate concrete containing silica-fume and natural zeolite

Jalilifar

Sajedi

Toosi

2020

rdlc

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“…When the volume diminution is not equal to the volume of water evaporated, the cracking appears. Therefore, the air penetration is correlated to the cracking [54]. The second phenomenon play the role on the early-age-cracking is the plastic shrinkage.…”

Section: Effects Of Recycled Aggregates On Early-age Racmentioning

confidence: 99%

Recycled aggregate concretes – A state-of-the-art from the microstructure to the structural performance

Bui

2020

Construction and Building Materials

102

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“…Such utilization also helps the recycling of construction waste. Research has been carried out to explore the different properties of recycled concrete that can be divided into recycled coarse aggregate (RCA) [ 8 , 9 ] and recycled fine aggregate (RFA) [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Property Tests and Strength Formulas of Basalt Fiber Reinforced Recycled Aggregate Concrete

2018

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In order to investigate the influence of basalt fibers (BFs) on the mechanical performance of recycled aggregate concrete (RAC), some groups of RAC specimens were first tested involving different types of fibers such as carbon fibers, steel fibers, polypropylene fibers and hybrid fibers. The main four indices for the investigation consisted of cube compressive strengths, axial compressive strengths, splitting tensile strengths and Young’s modulus. The effects of fiber volume fractions on the RAC slumps were also discussed. Meanwhile, the mechanical properties and failure modes of the BF-reinforced RAC were compared with those of other fiber-reinforced RAC and common concrete (CC). Subsequently the optimal volume fractions of BFs were explored for different mechanical properties within the volume fraction range of 0–0.2%. The back propagation neural networks were further applied to predict and validate the optimal BF fractions. Lastly, the general strength formulas, as well as the elastic modulus formula, for BF-reinforced RAC were deducted based on the specimen test results. It is found that the addition of fibers may improve the failure modes of RAC and different fibers present positive or negative effects on the mechanical properties. The optimal volume fractions of BF with respect to the four mechanical indices are 0.1%, 0.15%, 0.1% and 0.2% respectively. The proposed strength and elastic modulus formulas of BF-reinforced RAC provide satisfactory predictions with the test results and thus can be used as a reference in practice.

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Influence of recycled coarse aggregates on permeability of fresh concrete

Cited by 22 publications

References 30 publications

Evaluating the durability of recycled concrete made of coarse recycled aggregate concrete containing silica-fume and natural zeolite

Evaluating the durability of recycled concrete made of coarse recycled aggregate concrete containing silica-fume and natural zeolite

Recycled aggregate concretes – A state-of-the-art from the microstructure to the structural performance

Mechanical Property Tests and Strength Formulas of Basalt Fiber Reinforced Recycled Aggregate Concrete

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