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Sanjuán, Miguel Ángel

doi:10.1023/a:1018624824702

Cited by 26 publications

(4 citation statements)

References 13 publications

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“…The compressive strength of concrete after different dry-wet cyclic corrosion durations can be calculated by introducing parameters of the damage depth x d (t), the corrosion depth x c (t), the corrosion damage coefficient γ d , and the corrosion enhancement coefficient γ c into Formula (10), and a comparison between the calculated and test values is shown in Figure 10. The calculated values were in good agreement with the test values, and both showed a trend of first increasing and then decreasing as the dry and wet cyclic corrosion duration increased.…”

Section: Results Verification and Analysismentioning

confidence: 99%

“…• f cu (0) (10) where f cu (t) is the compressive strength of concrete after corrosion for t month; f cu (0) is the compressive strength of noncorroded concrete; A d (t) and A c (t) are the cross-sectional areas of the failure zone and filling zone, respectively; A is the total cross-sectional area of the cross section; and a is the length of cross section.…”

Section: Mechanical Model Of Compressive Strengthmentioning

confidence: 99%

“…There are many types of corrosive media that can affect the compressive strength of concrete, among which chloride [4,5] and sulfate [6,7] are the most notable. When chloride salt enters concrete, it mainly reacts with the Tricalcium aluminate (C 3 A) [8] in concrete and produces Friedel's salt (C 3 A•CaCl 2 •10H 2 O) [9,10], which does not have cementitious properties; this phenomenon causes the concrete to deteriorate and the compressive strength to reduce. Sulfate physically and chemically attacks concrete [11].…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Concrete Compressive Strength in Saline Soil Environments

et al. 2022

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Saline soil in Western China contains high concentrations of chloride ions, sulfate ions, and other corrosive ions, and the performance of concrete will substantially deteriorate from exposure to this environment. Therefore, it is of great significance to study and predict the concrete compressive strength in saline soil environments. In this paper, the effects of corrosion on concrete were analyzed from the aspects of surface damage, damage depth, and X-ray diffraction (XRD) of the corrosion products. The effects of corrosion were quantified by damage depth and corrosion depth. Then, considering the corrosion effects combined with Fick’s diffusion law, a time-dependent model of concrete compressive strength and a time-dependent model of damage depth were established. The results show that the deterioration of concrete gradually developed from the surface to the interior, and that the interface of the concrete specimen was equivalent to three parts: a failure zone, a filling zone, and an undisturbed zone. The results also showed that the time-varying model of concrete compressive strength proposed by the author was fully applicable, with an error of less than five percent. The service life of concrete predicted by the damage depth was found to be about 253 months (21.1 years), and the service life predicted by the time-varying compressive strength model was about 187 months (15.6 years). Both prediction results were far less than the normal concrete service life of 50 years. In addition, the long-term compressive strength of the corroded concrete was about 90% of that of the noncorroded concrete, which did not deteriorate with the corrosion time.

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Section: Results Verification and Analysismentioning

confidence: 99%

Section: Mechanical Model Of Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of Concrete Compressive Strength in Saline Soil Environments

et al. 2022

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“…When chlorides attack the concrete, they are combined as physical adsorption or chemical bonding. The chemical bounding mainly refers to chloride ions reacting with C3A and C4AF in cement, or subsiding the OHin the hydration product to form Friedel's salt [3][4][5] and analogs [6,7] . The physical adsorption refers to chloride ions being adsorbed on cement hydration products, which is less stable than chemical bonding.…”

Section: Introductionmentioning

confidence: 99%

Different Chlorides Attack on the Hydration of Calcium Aluminate Cement at 5~40°C

Wang

Chen

Xiang

et al. 2021

MSF

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Calcium aluminate cement (CAC) has excellent resistance to seawater erosion, but the mechanism remains to be explored. Effects of NaCl and CaCl2 on the hydration of CAC at 5, 20 and 40°C were investigated in this paper by X-ray diffraction(XRD), thermal analyzer(TG-DSC), scanning electron microscopy(SEM), acoustic and electroacoustic spectrometer. Results show that the varieties of chlorides have great impacts on the chloride binding ability, mechanical properties and microstructure of cement pastes at different temperatures. At 5°C and 20°C, the formation of C2AH8 is suppressed by chloride attack. Though the addition of NaCl promotes the formation of CAH10, CaCl2 leads to a denser microstructure and the improvement in compressive strength. At 40°C, C2AH8 disappears by chloride attack, while C3AH6 and Friedel’s salt increase. Comparing with the attack of CaCl2, NaCl contributes to the formation of C3AH6. Therefore, it results in a the retraction in compressive strength, ascribing to a coarser structure. In addition, although NaCl is superior in chemical binding ability, CaCl2 has better physical adsorption ability which dominants the binding process, and thus leading to greater amount of bonded chloride than that with NaCl. This research provides the oretical basis for the application of CAC in marine environment.

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