Concrete with Improved Chloride Binding and Chloride Resistivity by Blended Cements

Kopecskó, Katalin; Balázs, György L.

doi:10.1155/2017/7940247

Cited by 9 publications

(5 citation statements)

References 14 publications

(15 reference statements)

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“…However, it must be mentioned that the RAC-C50 and NAC-0.51 were produced with effective water-cement ratios of 0.47 and 0.51, respectively. In agreement with the study conducted by Kopeckó and Balázs et al [78], it was shown that an increase in the w/c ratio leads to an increase in the depth of chloride penetration while keeping the same cement content constant. Moreover, when FRCA was employed for concrete production, and more evidently with the use of 20% FRCA in the replacement of natural sand, the chloride ion penetrability increased.…”

Section: Chloride Ion Penetrationsupporting

confidence: 92%

“…The ASTMC1202 test classified the chloride ion penetrability as low (1000-2000 Coulomb), moderate (2000-4000 Coulomb), and high (>4000 Coulombs of total passed charge) [75]. This research found that chloride ion penetrability varied significantly according to the type of cement used, as several researchers have stated [32,[76][77][78]. In addition, a direct correlation was observed between the percentage of recycled aggregate replacement ratio and chloride ion penetrability.…”

Section: Chloride Ion Penetrationmentioning

confidence: 59%

“…Figure 7a shows that all concretes manufactured with CEM IIAL exhibit high values of chloride ion penetration. The addition of BFS to cement reduced the ion penetrability of the concrete, as Kopecký and Balázs et al [78] total charge passed value for all concretes mixed using CEM IIIB cement with different percentages of recycled mixed aggregates (volumes of 0%, 25%, 50% and 100%) ranged from 800 to 1400 coulombs. The authors have also demonstrated that an adequate cement type was necessary to increase chloride ion penetration resistance in concrete production.…”

Section: Chloride Ion Penetrationmentioning

confidence: 90%

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Durable Structural Concrete Produced with Coarse and Fine Recycled Aggregates Using Different Cement Types

Vintimilla,

Etxeberria,

2023

Sustainability

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The durability properties of structural recycled aggregate concrete (RAC) produced with 50% coarse recycled concrete aggregates and up to 20% fine recycled concrete aggregates were analysed and compared to those of conventional concrete (NAC). Both the RAC and NAC mixtures achieved the same compressive strength when using an effective water–cement ratio of 0.47 and 0.51, respectively. All the concretes were produced using three types of cement: CEM II A/L 42.5 R, CEM II A/S 42.5 N/SRC and CEM III/B 42.5 N-LH/SR. The properties of drying shrinkage, chloride permeability, and accelerated carbonation coefficient of the concretes were determined experimentally, and the obtained results were compared with the values estimated by specific standards of exposure to XC1–XC4 (corrosion induced by carbonation can happen due to the presence of humidity) and XS1 (corrosion caused by chlorides from seawater) environments. The results showed that all the concretes achieved maximum drying shrinkage for use in structural concrete. Any concretes produced with CEM IIIB, including the RAC-C50-F20 concrete, achieved very low chloride ion penetrability, ranging between 500 to 740 Coulombs. In addition, all concretes manufactured with CEM IIAL and CEM IIAS, including RAC-C50-F20, were suitable for use in XC3 and XC4 exposure environments, both with 50- and 100-year lifespans.

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Section: Chloride Ion Penetrationsupporting

confidence: 92%

Section: Chloride Ion Penetrationmentioning

confidence: 59%

Section: Chloride Ion Penetrationmentioning

confidence: 90%

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Durable Structural Concrete Produced with Coarse and Fine Recycled Aggregates Using Different Cement Types

Vintimilla,

Etxeberria,

2023

Sustainability

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“…At the same water to binder ratio (0.4) the migration coefficients of the mortar mixtures are different due to the different porosities and chloride ion binding capacities of the SCMs [12]. The specific surface area of the pores can provide the reaction area for the chloride ion binding, which is a heterogeneous chemical reaction.…”

Section: Methodsmentioning

confidence: 99%

The influence of different types of SCMs on microstructure and macroscopic properties of cementitious materials

Kopecskó

Mlinárik

2022

J. Phys.: Conf. Ser.

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In our study, the influence of different supplementary cementitious materials (SCMs) such as metakaolins, silica fume (microsilica) or filtered coal fly ash on the performance of concrete is discussed. The effects of different types and dosages of the SCMs have been investigated. Centrilit NC (MK1) and Metaver N (mk2) type metakaolins, Microsit® 20 (MS) type filtered coal fly ash or Centrilit Fume SX (SF) silica fume suspension was chosen as the replacement for the CEM I 42.5 N-SR0 sulphate resistant Portland cement. In addition to the two-component mixtures, we also examined the behaviour of the ternary blends, i.e. the combinations of SCMs. For the experiments, mortar prisms and cylindrical mortar specimens were prepared with water to binder ratio of 0.4. The paper presents the test results performed up to two years. The compressive strengths of the mixtures were examined. The most critical property of the cement-bound materials, the chloride migration coefficient of each mixture, was determined. The microstructure of the mixtures was determined by mercury intrusion porosimetry at the age of one year. Our results indicated (i) the best compressive strength was achieved for MK2 and for MK1 with combination of SF; (ii) the pore structure is much finer in the case of MK1 mixtures compared with those of MK2 or MS mixtures; (iii) the whole most frequent pore diameter interval falls into the range of medium capillaries only in case of MK1 (10 w%), for other mixtures the large capillaries are present in different extent. The SCMs greatly influence the extent of the enhancement in chloride migration coefficients with age: the less reduction was found for the mixtures of MK1, and the highest reduction was found for mixtures of MS. There is no direct function between the compressive strength, total porosity, specific surface of porosity or chloride migration coefficients.

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“…Megállapították, hogy az őrölt granulált kohó-Megállapították, hogy az őrölt granulált kohósalakot tartalmazó cementpépek kloridion-megkötő képessége nagyobb, mint a tiszta portlandcementpépeké. (Balázs, 2004(Balázs, , 2010Kopecskó et al, 2017).…”

Section: Kloridkorrózióunclassified

Betonok oldódásos korróziója – szakirodalmi áttekintés

Balázs¹,

Kausay²,

Kopecskó³

et al. 2019

Vasbetonépítés

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a vizek és folyadékok kémhatásának, a víz keménységének és széndioxid-(szénsav-) tartalmának fogalmát, valamint a betonoknak a vizek savassága és agresszív széndioxid-(szénsav)-tartalma okozta-olykor a karbonát-keménységgel (változó keménységgel) is befolyásolt-korrózióját elemeztük a szakirodalom alapján. Cikksorozatunk 2. részében a lágyvizek, a szervetlen anyagok okozta oldódásos betonkorrózió szakirodalmát tekintjük át.

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Concrete with Improved Chloride Binding and Chloride Resistivity by Blended Cements

Cited by 9 publications

References 14 publications

Durable Structural Concrete Produced with Coarse and Fine Recycled Aggregates Using Different Cement Types

Durable Structural Concrete Produced with Coarse and Fine Recycled Aggregates Using Different Cement Types

The influence of different types of SCMs on microstructure and macroscopic properties of cementitious materials

Betonok oldódásos korróziója – szakirodalmi áttekintés

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