Influence of effective mixing water in recycled concrete

Montero, J.; Laserna, Santiago

doi:10.1016/j.conbuildmat.2016.12.006

Cited by 45 publications

(17 citation statements)

References 16 publications

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“…Similar results were also reported in [20]. The simultaneous decreases in slump and compressive strength are surprising as normally higher free water content leads to higher slump and lower compressive strength as demonstrated for concretes [11][12][13][14][15]. An alternative explanation could be that the reduction in slump was so critical that it affected the compaction of the mortar and subsequently the compressive strength.…”

Section: Introductionsupporting

confidence: 77%

“…Several studies have analysed the resulting concrete properties when containing coarse recycled concrete aggregate (CRCA) with variable initial hygroscopic conditions, in relation to the approach to account for its water uptake in the mix proportioning [11][12][13][14][15]. There is a perceived general agreement on significant differences in concrete performance due to the respective methodologies, even when the reported total mixing water is the same in all mixes.…”

Section: Introductionmentioning

confidence: 99%

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A critical review of the resulting effective water-to-cement ratio of fine recycled aggregate concrete

Sosa

Zaccardi

Zega

2021

Construction and Building Materials

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Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

A critical review of the resulting effective water-to-cement ratio of fine recycled aggregate concrete

Sosa

Zaccardi

Zega

2021

Construction and Building Materials

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“…In this case, mixtures with sulfur have lower compressive strength. Similarly to the use of porous aggregates, such as recycled concrete aggregate (73), difference in porosity of the used filler directly affects the water volume available for the chemical reactions, i.e., lower the porosity of filler, higher the 'free' water content, and, consequently, the higher effective water to cement ratio, and finally lower compressive strength (74).…”

Section: Compressive Strengthmentioning

confidence: 99%

Effects of waste sulfur content on properties of self-compacting concrete

et al. 2020

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Self-compacting concrete (SCC) contains fine mineral fillers such as limestone powder. The idea of this study was to partially replace limestone with waste sulfur since it is hydrophobic, insoluble in water and therefore chemically inert and to compare the properties of produced concrete samples. Fresh concrete properties included: slump-flow, t500, V-funnel time, L-box ratio, segregation ratio, density, and entrained air content. Hardened concrete was tested for compressive, flexural and bond strengths, ultrasonic velocity, dynamic elasticity modulus, dynamic Poisson’s ratio, and microstructure. Flowability and segregation increased, while bulk density, compressive and flexural strength, dynamic elasticity modulus and ultrasonic velocity slight declined. Times t500 and V-funnel time, L-box ratio and entrained air changed insignificantly. Considering that all properties should remain or improve in case of waste valorization and the criteria should set to satisfy requirements for SCC, this study proved that all mixtures can be used for structural applications.

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“…The water absorbability of RCA, which ranges up to 15% [2], is necessary to know due to the mixture design for further workability of the concrete mix. These aspects lead to the higher water absorption, decline of freeze-thaw resistance and reduction in the carbonation resistance of recycled aggregate concrete (RAC) [7][8][9]. Generally, the replacement rate up to 30% of RCA has no significant influence on total porosity and compressive strength of RAC.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Durability of Recycled Masonry Aggregate Concrete

et al. 2020

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The use of recycled masonry aggregate for concrete is mostly limited by the worse properties in comparison with natural aggregate. For these reasons it is necessary to find ways to improve the quality of recycled masonry aggregate concrete and make it more durable. One possibility is utilization of crystalline admixture which was verified in this study by laboratory measurements of key material properties and durability. The positive influence of mineral admixture was proved for freeze-thaw resistance. The positive impact to carbonation resistance was not unambiguous. In conclusion, the laboratory evaluation shows how to improve the durability of recycled masonry aggregate concrete, however, it is necessary to investigate more about this topic.

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Influence of effective mixing water in recycled concrete

Cited by 45 publications

References 16 publications

A critical review of the resulting effective water-to-cement ratio of fine recycled aggregate concrete

A critical review of the resulting effective water-to-cement ratio of fine recycled aggregate concrete

Effects of waste sulfur content on properties of self-compacting concrete

Improvement of the Durability of Recycled Masonry Aggregate Concrete

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