Measuring the water absorption of recycled aggregates, what is the best practice for concrete production?

Quattrone, Marco; Cazacliu, Bogdan; Angulo, Sérgio Cirelli; Hamard, Erwan; Cothenet, Alexis

doi:10.1016/j.conbuildmat.2016.07.019

Cited by 62 publications

(18 citation statements)

References 71 publications

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“…replacement of NAs by RCAs (coarse and fine), showed much higher results than the other concretes. This was probably due to the porous network of RFA and RCA, particularly in RFA composed by old cement paste characterized by high porosity, a fact that has also been reported by other researchers [9,18].…”

Section: A N U S C R I P Tsupporting

confidence: 72%

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Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Berredjem

Arabi

Molez

2020

Construction and Building Materials

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: A N U S C R I P Tsupporting

confidence: 72%

“…Several studies have concluded that the replacement of NA by RCA requires an increase of water/cement ratio to overcome the flow difficulties of fresh concrete [3,6,[16][17][18]. However, as reported by Wirquin et al [19], Chaise [20] and Olivier [21], the transport properties largely determine the durability of concrete.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Berredjem

Arabi

Molez

2020

Construction and Building Materials

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“…Also, for a mechanical sieving during 10 minutes, the amount of passing was 7.9% for a RCA obtained from a 26.5 MPa concrete, 9.5% for a RCA obtained from a 41 MPa concrete and only 0.2% for a natural aggregate. Quattrone et al [15] shown that the mass of the recycled aggregates decreases when toweling to obtain the saturated surface dry state, during the standard water absorption test procedure.…”

Section: Introductionmentioning

confidence: 99%

Recycled concrete aggregate attrition during mixing new concrete

Moreno-Juez¹,

Cazacliu²,

Cothenet³

et al. 2016

Construction and Building Materials

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In this work, the recycled concrete aggregate (RCA) friability during mixing was studied in order to better understand the evolution of this material during the mixing process and improve the recycled aggregate concrete mix-design. The influence of some important materials and process parameters was evaluated: initial abrasion resistance and initial moisture of the aggregates, mixer geometry, mixing time and mixing speed. To assess the mixing process effect on the recycled concrete aggregate friability, three different aspects were evaluated; the mass loss (mass of fraction inferior to 2.5 mm) the grading and the angularity evolutions with mixing time of an initially 10-14 mm aggregate. Tests were carried out in two types of laboratory concrete mixers, a planetary 30 liters mixer from Skako and an intensive 5 liters Erich mixer. The results revealed that in normal laboratory setting of the mixers configuration, the mass loss for natural aggregate (NA) is less than 1% of the coarse aggregate. This percentage reach 3% for good quality recycled concrete aggregate (MDE value of 21) and 5% for lower quality recycled concrete aggregate (MDE value of 27). The mass loss directly depends on the mixing parameters and the degradation of the recycled concrete aggregate drastically increased when the mixing speed was raised to 500 RPM. By analyzing the grading evolution during mixing, it was shown that both cleavage (creation of intermediate size particles) and attrition (creation of small particles) mechanisms influenced the aggregate degradation. However, the configuration of mixing significantly influenced the proportion of attrition and cleavage mechanisms. To complete this work, the angularity evolution showed that recycled concrete aggregate surface becomes smoother and the edges more rounded after mixing.

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“…After finishing treatment process, RCA was evaluated by water absorption coefficient following ASTM C127-07 method for its conveniences [27] as the results in the Fig. 3.…”

Section: Water Absorption Coefficientmentioning

confidence: 99%

Enhancement of Recycled Aggregate Concrete Properties by a New Treatment Method

Bui

Satomi

Takahashi

2018

GEOMATE

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ABSTRACT:Recently, decreasing natural sources of aggregate accompanied by increasing large quantities of construction and demolition waste (CDW) cause challenges for environment and construction industry. A significant solution for this is to recycle CDW as a new aggregate source for concrete. However, using recycled concrete aggregate (RCA) in concrete involves various obstacles and controversial issues in controlling the quality of recycled aggregate concrete (RAC). This study is an effort to improve the quality of RAC containing 100% coarse RCA by using pozzolanic and sodium silicate solution as new treatment solutions. This study examined performance abilities of RAC after being treated with new treatment solutions and a new mixing procedure. The mechanical properties of RAC were evaluated based on testing of concrete under various conditions. The significant results indicated that sodium silicate combined with pozzolanic materials can improve mechanical properties of RAC containing 100% coarse RCA. At 20% concentration of sodium silicate and silica fume, the compressive strength of RAC could improve up to 36%. Achievements of this approach demonstrated its effectiveness in enhancing the strength of RAC, which is potentially applied to treating RCA for concrete in the future.

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Measuring the water absorption of recycled aggregates, what is the best practice for concrete production?

Cited by 62 publications

References 71 publications

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Recycled concrete aggregate attrition during mixing new concrete

Enhancement of Recycled Aggregate Concrete Properties by a New Treatment Method

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