Effects of stress on concrete expansion due to delayed ettringite formation

Thiebaut, Yvan; Multon, Stéphane; Sellier, Alain; Boutillon, Laurent; Belili, Djemal; Linger, Lionel; Cussigh, François; Hadji, Sofiane

doi:10.1016/j.conbuildmat.2018.06.172

Cited by 45 publications

(39 citation statements)

References 34 publications

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“…Ettringite formation can result in monolite expansion and damage [43]. In general, the formation of pozzolanic components, as well as the presence of calcite and portlandite, further confirms that these matrices have good potential in use as structural materials [29].…”

Section: Chemical Mineralogical and Structural Characterizationmentioning

confidence: 75%

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Kerkez

Radjenovic

Pilipović

et al. 2019

Period. Polytech. Chem. Eng.

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The objective of this study is to enable a better understanding of the effectiveness of solidification/stabilization (S/S) technique in treating polluted sediment, and provide the much needed validation of the longevity of the technology. In this research kaolinite and montmorillonite, with a certain proportion of lime, were used for S/S treatment of sediment polluted with metals. Leachability of metals was examined using the toxicity characteristic leaching procedure (TCLP) and the German standard leaching test (DIN 3841-4 S4) prescribed in national legislative. Results indicated successful S/S treatment using both clays and lime, from the aspect of all leached metals even with pH variations over time and slight changes in structural integrity of specimens. X-ray diffraction (XRD), scanning electron microscope (SEM) analyses and porosity measurement were also performed on the prepared monolithic matrices. XRD qualitative and semi-quantitative analysis proved hydration and pozzolanic product formation with increase in their content and finer crystallites formation over time. SEM analysis confirmed the presence of morphologically dense and stable structures while pore size distribution indicated on mesoporous matrices with ongoing compaction over time. Generally, structural microanalysis indicated the formation of hardened matrices over time and hydration process has been fully completed and further carbonation took place. Unconfined compressive strength measurement gave the satisfying results and matured monolite with 30 % of montmorillonite and 10 % of lime can be considered potentially applicable as non-load-bearing material. In summary, all results indicated that this kind of S/S treatment can achieve satisfactory durability and represent reliable and economically feasible technique for long-term remediation of metal polluted sediment.

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Section: Chemical Mineralogical and Structural Characterizationmentioning

confidence: 75%

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Kerkez

Radjenovic

Pilipović

et al. 2019

Period. Polytech. Chem. Eng.

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“…Figure 8 suggests that the addition of STs can cause mortars to expand. The sulfur in STs was released and converted to sulfate ions, which promoted the formation of expansive hydration products, such as ettringite [ 32 , 33 ]. With the increase in the replacement rate of STs, the expansion ratio of mortars first increased and then decreased.…”

Section: Resultsmentioning

confidence: 99%

Effect of Sulphur-Containing Tailings Content and Curing Temperature on the Properties of M32.5 Cement Mortar

Chen

Wang

et al. 2021

Materials

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The effect of the dosage of sulphur-containing tailings (STs) and curing temperature on the properties of M32.5 cement mortar was studied in this work. An experimental study was conducted to evaluate the effects of STs with different substitution ratios (0, 10%, 20%, 30%, 40%) on the compressive strength experiment, fluidity, expansion ratio, and pore structure of M32.5 cement mortar. The results showed that the addition of STs reduced the fluidity of mortar, and the fluidity decreased with the increase of the STs dosage. The compressive strength of mortars increased at a lower substitution rate (0~20%) but decreased at a higher substitution rate (>20%). Ettringite peaks and new sulfate peaks were found by X-ray diffraction (XRD) analysis. Scanning electron microscope (SEM) observation of the microstructure showed that a large number of hydrated products, such as ettringite, formed and filled in the interstitial space, which was conducive to the development of strength. The optimal STs replacement ratio of river sand was 10%. Then, the performance of mortar at curing temperatures of 23 ± 1, 40, 60, and 80 °C was further investigated under the optimal STs replacement ratio. Under high-temperature curing conditions, the early strength of M32.5 cement mortar with STs increased greatly, but the late strength decreased gradually with the increase in curing temperature. The early strength development of the mortar mainly depended on the high speed of hydration reaction, and the late strength variation was mainly affected by hydration products and the pore size distribution. After comprehensive consideration, the optimal curing temperature of M32.5 cement mortar with STs was 40 °C.

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“…However, even if such expansions did not generate damage under unrestrained conditions (often associated with low expansion kinetics) at the sample scale, the behavior may be F. Ouvrier-Buffet et al, Linear and nonlinear resonant ultrasonic techniques applied to assess delayed ettringite formation on concrete samples, Construction and Building Materials (2021) -https://doi.org/10.1016/j.conbuildmat.2020.121545 different under loading. To this respect, the recent works of Thiebaut et al [40] on the effects of stress on DEF may be relevant and should be generalized to better understand the degradation mechanisms owed to swelling pathologies.…”

Section: Discussionmentioning

confidence: 99%

Linear and nonlinear resonant ultrasonic techniques applied to assess delayed ettringite formation on concrete samples

Ouvrier-Buffet

Eiras

Garnier

et al. 2021

Construction and Building Materials

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Effects of stress on concrete expansion due to delayed ettringite formation

Cited by 45 publications

References 34 publications

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Effect of Sulphur-Containing Tailings Content and Curing Temperature on the Properties of M32.5 Cement Mortar

Linear and nonlinear resonant ultrasonic techniques applied to assess delayed ettringite formation on concrete samples

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