Validation of the alkali contribution by aggregates to the concrete pore solution

Drolet, Cédric; Duchesne, Josée; Fournier, Benoît

doi:10.1016/j.cemconres.2017.04.001

Cited by 22 publications

(9 citation statements)

References 15 publications

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“…Although the OH − ion concentration for CEM IV/B (P) pastes was higher than that evaluated for CEM IV/B (V) pastes, it was signi cantly lower than the OH − ion concentrations (0.7-0.9 mol/l) reported in the literature for high-alkali Portland cement pastes [19,20]. is revealed a good capability of natural pozzolana in reducing the alkalinity of the pore solution of cement pastes containing such an SCM.…”

Section: Evaluation Of the Hydroxyl Ion Concentration In The Pore Solmentioning

confidence: 55%

“…Significant alkali contribution by Canadian aggregates to the concrete pore solution has also been reported and validated by Drolet et al [20].…”

Section: Residual Capability Of Alkali Binding By Long-term Hydrated mentioning

confidence: 69%

“…Unfortunately, in this review, as well as in other literature works on this subject, no experimental data were available regarding the chemical composition of the pore solution of blended cement pastes containing natural pozzolana. erefore, the comparison was restricted to CEM IV/B (V) pastes, for which a consistency was found between the OH − ion concentration value of the present study (0.383 mol/l) and those (0.3-0.4 mol/l) reported for blended cement pastes made with 30-40 wt.% coal y ash, w/c ratio 0.40, and di erent alkali contents of binder [19,20].…”

Section: Evaluation Of the Hydroxyl Ion Concentration In The Pore Solmentioning

confidence: 78%

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Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures

Berra

Mangialardi

Paolini

2018

Advances in Materials Science and Engineering

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An experimental procedure was developed and applied to cement pastes made with two different pozzolanic cements (CEM IV/B (P) and CEM IV/B (V)) in order to ascertain the existence of a residual capability of alkali binding by long-term hydrated pozzolanic cements and, at the same time, to evaluate the alkali retention capability and the concentration of OH − ions in the pore solution of such cementitious matrices. e developed procedure consisted of accelerated curing of cement paste specimens (150 days at 60°C and 100% RH), subsequent leaching tests at 60°C for 30 days by using deionized water or basic solutions (NaOH or KOH at different concentrations) as leaching media, and correlation of the leaching test results with a simple mass balance equation for sodium and potassium ions. e developed procedure was found to be appropriate for evaluating both the pore liquid alkalinity and the alkali retention capability by long-term hydrated pozzolanic cement pastes. A residual capability of alkali binding was also identified for both tested pozzolanic cements, thus indicating their potential ability to prevent (CEM IV/B (V)) or minimize (CEM IV/B (P)) the risk of deleterious expansion associated with alkali-aggregate reaction in long-service concrete structures, like concrete dams.

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Section: Evaluation Of the Hydroxyl Ion Concentration In The Pore Solmentioning

confidence: 55%

“…Significant alkali contribution by Canadian aggregates to the concrete pore solution has also been reported and validated by Drolet et al [20].…”

Section: Residual Capability Of Alkali Binding By Long-term Hydrated mentioning

confidence: 69%

Section: Evaluation Of the Hydroxyl Ion Concentration In The Pore Solmentioning

confidence: 78%

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Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures

Berra

Mangialardi

Paolini

2018

Advances in Materials Science and Engineering

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“…The immersion test results using the oversaturated lime solution are shown in Released due to the formation of reaction products such as calcium (aluminate) silicate hydrate (C-(A-)S-H) (Van Aardt and Visser 1977;Bérubé et al 2002;Drolet et al 2017). It was therefore likely insufficient to agitate the sample just once per a day.…”

Section: Alkali Release From Aggregatesmentioning

confidence: 99%

“…These results indicate that a large gap should exist between the amount of alkali released in the immersion test and the potential risk of increased hydroxide ion concentration in concrete. Drolet et al (2017), for instance, investigated the actual alkali contribution by aggregates to a pore solution by means of high-pressure pore solution extraction and other techniques. The amount of alkali released was then compared to the amount of releasable alkali in an immersion test.…”

Section: Potential Risk Of Alkali Release From Aggregates Causing Thementioning

confidence: 99%

Effects of Soak Solution Type on Alkali Release from Volcanic Aggre-gates − Is Alkali Release Really Responsible for Accelerating ASR Expansion? −

Kawabata

Yamada

Igarashi

et al. 2018

ACT

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Alkali release from aggregates is considered to cause expansion due to the alkali-silica reaction (ASR), owing to the increase in the hydroxide ion concentration (namely pH) of the pore solution. However, a direct validation of this assertion has not yet been made. In this research, the effects of the type of soak solution, which might better mimic the composition of the pore solution, on the behavior of alkali release from aggregates are investigated through immersion tests of aggregates. More importantly, accompanying ions dissolved from the aggregates are also measured in order to determine the mechanism for the increase in hydroxide ion concentration of the pore solution. The test results show that this increase can barely be observed, despite a considerable amount of alkalis being released. The results critically question the conventional view that alkali released from an aggregate serves to accelerate the ASR.

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Investigation on alkalinity reduction methods of eco‐porous concrete

Yang

Gao

Yin

et al. 2018

Materialwissenschaft Werkst

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Laboratory tests were conducted to investigate the different alkalinity reduction methods. Single alkalinity‐reduced treatment and hybrid alkalinity‐reduced method were employed respectively. Single alkalinity‐reduced treatment methods include oxalic acid soaking, oxalic acid spraying and deep penetrating sealer (DPS) spraying. The hybrid alkalinity‐reduced method used silica fume (SF) and ferrous sulfate. Deep penetrating sealer spraying and rapid carbonization were performed in the hybrid alkalinity‐reduced treatment. The compressive strength and alkalinity of eco‐porous concrete were evaluated by employing different alkalinity‐reduced methods. The results showed that effect of single alkalinity‐reduced treatment on the strength of eco‐porous concrete is not obvious. The 28‐day compressive strength of the specimens was 7.8 MPa ‐ 10.3 MPa and the pH value was about 10.4. By using hybrid alkalinity‐reduced method, the rapid carbonization and alkali solidification gave the best performance in strength and alkalinity reduction. The 28‐day compressive strength was 8.1 MPa and pH value was reduced to 10.0.

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Validation of the alkali contribution by aggregates to the concrete pore solution

Cited by 22 publications

References 15 publications

Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures

Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures

Effects of Soak Solution Type on Alkali Release from Volcanic Aggre-gates − Is Alkali Release Really Responsible for Accelerating ASR Expansion? −

Investigation on alkalinity reduction methods of eco‐porous concrete

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