Feasibility assessment on self-healing ability of cementitious composites with MgO

Beshr, B. Saleh Salem; Mohaimen, I.M. Abdul; Azline, M.N. Noor; Azizi, Shahab; Bakar, Nabilah Abu; Aznieta, Abdul Aziz Farah Nora

doi:10.1016/j.jobe.2020.101914

Cited by 18 publications

(3 citation statements)

References 17 publications

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“…MgO and CaO, the main components of healing agent WM, have been frequently studied in literature as a healing agent. In literature, the addition of the expansive mineral additive MgO has shown to increase the healing efficiency of cracks [45,46]. Qureshi and Al-Tabbaa found a complete closure of cracks up to 500 µm after 28 days of healing [47].…”

Section: Discussionmentioning

confidence: 99%

Comparative analysis of three different types of self-healing concrete via permeability testing and a quasi-steady-state chloride migration test

De Brabandere,

Van Mullem,

Lee

et al. 2024

Construction and Building Materials

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Section: Discussionmentioning

confidence: 99%

Comparative analysis of three different types of self-healing concrete via permeability testing and a quasi-steady-state chloride migration test

De Brabandere,

Van Mullem,

Lee

et al. 2024

Construction and Building Materials

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“…A similar pre-cracking method by Saleh et al [43] was adopted in this study, by introducing compression cracks on the cement paste samples. The crack was created at the age of 7 days, which was at the early paste age.…”

Section: Crack Formationmentioning

confidence: 99%

Evaluation of the Compatibility of Modified Encapsulated Sodium Silicate for Self-Healing of Cementitious Composites

et al. 2021

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Healing agent carriers play a significant role in defining the performance of the autonomous self-healing system. Particularly, the ability to survive during the mixing process and the release of the healing agent when cracks occur without affecting the mechanical properties of the cementitious composite. Up to now, these issues are still a concern since glass capsules are unable to survive the mixing process, while some types of microcapsules were reported to cause a decrement in strength as well as limited strength recovery. Therefore, this study was twofold, addressing the surface treatment of polystyrene (PS) capsules and the evaluation of the compatibility of the modified capsules for cement-based applications. Secondly, assessing the healing performance of modified PS capsules in cementitious composites. Furthermore, the study also evaluates the potential healing performance due to the synergic effect between the encapsulation method and the autogenous self-healing mechanism. The investigation was carried out by measuring the changes in the pH of pore solution, FTIR analysis, survival ratio, and bonding strength. For self-healing assessment, the compression cracks on the cement paste were created at an early age and the strength recovery was measured at the age of 28 and 56 days. To identify the chemical compounds responsible for the healing process, SEM-EDX tests were conducted. Moreover, the effect of silica fume (SF) on bonding strength and self-healing was also evaluated. Based on the results, the modified PS capsules by roughing approach showed promising performance in terms of survivability, bonding, and recovery. The modified PS capsule increased the strength recovery by about 12.5–15% for 100%OPC and 95%OPC + 5%SF, respectively. The finding observed that the combining of modified PS capsules and the inclusion of SF gave high strength recovery of about 20% compared to 100%OPC without capsules. Thus, the modified PS capsule has a good potential for self-healing of cementitious-based applications.

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“…Magnesium oxide was selected as the main healing agent due to its expansion potential and compatibility with the cementitious matrix [20] and has been found to encourage the formation of brucite and other magnesium hydro-carbonate products [21]. Different studies have already shown good results for the same levels of MgO addition in the mix [17,18,[21][22][23][24][25][26][27][28]. This was combined with hydrated lime and bentonite.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Methodologies for Assessing Self-Healing Performance of Concrete with Mineral Expansive Agents: An Interlaboratory Study

et al. 2021

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Self-healing concrete has the potential to optimise traditional design approaches; however, commercial uptake requires the ability to harmonize against standardized frameworks. Within EU SARCOS COST Action, different interlaboratory tests were executed on different self-healing techniques. This paper reports on the evaluation of the effectiveness of proposed experimental methodologies suited for self-healing concrete with expansive mineral additions. Concrete prisms and discs with MgO-based healing agents were produced and precracked. Water absorption and water flow tests were executed over a healing period spanning 6 months to assess the sealing efficiency, and the crack width reduction with time was monitored. High variability was reported for both reference (REF) and healing-addition (ADD) series affecting the reproducibility of cracking. However, within each lab, the crack width creation was repeatable. ADD reported larger crack widths. The latter influenced the observed healing making direct comparisons across labs prone to errors. Water absorption tests highlighted were susceptible to application errors. Concurrently, the potential of water flow tests as a facile method for assessment of healing performance was shown across all labs. Overall, the importance of repeatability and reproducibility of testing methods is highlighted in providing a sound basis for incorporation of self-healing concepts in practical applications.

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Feasibility assessment on self-healing ability of cementitious composites with MgO

Cited by 18 publications

References 17 publications

Comparative analysis of three different types of self-healing concrete via permeability testing and a quasi-steady-state chloride migration test

Comparative analysis of three different types of self-healing concrete via permeability testing and a quasi-steady-state chloride migration test

Evaluation of the Compatibility of Modified Encapsulated Sodium Silicate for Self-Healing of Cementitious Composites

Evaluation of Methodologies for Assessing Self-Healing Performance of Concrete with Mineral Expansive Agents: An Interlaboratory Study

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