Durability assessment of self-healing in ordinary Portland cement concrete containing chemical additives

Aspiotis, Konstantinos; Sotiriadis, Konstantinos; Ntaska, Anna; Mácová, Petra; Badogiannis, Efstratios; Tsivilis, S.

doi:10.1016/j.conbuildmat.2021.124754

Cited by 23 publications

(4 citation statements)

References 76 publications

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“…Water absorption can be used to evaluate the healing ability of cracks in cement mortar specimens [43]. To study the healing ability of the specimens, the 28 days water absorption rate of specimens was tested in this study, and the measured water absorption rates were shown in Figure 12.…”

Section: Water Absorption Ratementioning

confidence: 99%

Study on the Synergistic Effect of Superabsorbent Polymer and Crystalline Admixture on Self-Healing Performance of Mortar Based on Image Binarization Method

Zhang,

Ma,

Liu

2023

Buildings

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Concrete self-healing technology is an effective method for autonomously repairing cracks, which can reduce the maintenance costs of concrete components and prolong their service life. This study investigates the mechanical properties and self-healing abilities of mortar with internally mixed superabsorbent polymers (SAPs) and crystalline admixtures (CAs). The compressive strength and recovery rate of the specimens were evaluated, and the self-healing performance of concrete specimens was assessed through water absorption tests and optical microscopy observation of healed cracks. Microscopic analysis of the crack fillings was conducted using SEM-EDS and XRD tests, revealing the mechanism of the synergistic effect of SAPs and CAs on self-healing. The results indicate that the physical filling effect of SAPs’ water absorption and expansion almost completes the healing action before the 7-day healing age, with a weakened healing ability after this age. The chemical action of CA activation continues to heal cracks up to the 90-day healing age. When SAPs and CAs are incorporated together into the concrete matrix, the mortar specimens exhibit the best healing ability before the 7-day healing age. As water is released from the SAPs, the ongoing activation reaction of CAs shows the most effective healing result at the 90-day age. SEM-EDS analysis confirmed that the addition of CAs increases the Ca/Si ratio of calcium silicate hydrated, transforming it from an amorphous cluster structure to a needle-like structure. Furthermore, the internal curing effect of SAPs promotes the activation reaction of CAs, resulting in a greater quantity of more densely structured calcium silicate hydrated.

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Section: Water Absorption Ratementioning

confidence: 99%

Study on the Synergistic Effect of Superabsorbent Polymer and Crystalline Admixture on Self-Healing Performance of Mortar Based on Image Binarization Method

Zhang,

Ma,

Liu

2023

Buildings

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“…New ideas, techniques and materials for concrete crack repair are also emerging. An innovative and promising approach is to achieve self-healing (Aspiotis et al. , 2021).…”

Section: Introductionmentioning

confidence: 99%

“…New ideas, techniques and materials for concrete crack repair are also emerging. An innovative and promising approach is to achieve self-healing (Aspiotis et al, 2021). Self-healing means that the material can recover after cracking, which can timely and effectively reduce the hazard of cracking on concrete durability (Shashank et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Statistical and experimental study on microcrack of mortar by a self-healing agent of bacteria adsorbed by expanded perlite

Li,

Sun,

Wang

et al. 2023

MMMS

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PurposeThe purpose of this paper is to add expanded perlite (EP) immobilized microorganisms that replace part of the standard sand in mortar to improve the self-healing ability of mortar cracks and reduce the water absorption of mortar after healing.Design/methodology/approachBacillus pseudofirmus spores were immobilized with EP particles as self-healing agents. The effects of adding self-healing agents on the compressive strength of mortar specimens were observed. The ability of mortar specimens to heal cracks was evaluated using crack microscopic observation and water absorption experiments. The filler at the cracks was microscopically analyzed by scanning electron microscope and X-ray diffraction experiments.FindingsFirst, the internal curing effect of EP promotes the hydration of cement in mortar, which generates more amount and denser crystal structure of Ca(OH)2 at mortar cracks and improves the self-healing ability of mortar. Second, the self-healing ability of mortar improves with the increase of self-healing agent admixture. Adding a self-healing agent of high admixture makes the planar undulation of calcite crystal accumulation at mortar cracks more significant. Finally, the initial crack widths that can be completely healed by adding EP and self-healing agents to the mortar are 200 µm and 600 µm, respectively.Originality/valueThe innovation points of this study are as follows. (1) The mechanism of the internal curing effect of EP particles on the self-healing ability of mortar cracks was revealed by crack microscopic observation tests and microscopic experiments. (2) The effect of different self-healing agent amounts on the self-healing ability of mortar cracks has been studied. (3) The effects of EP particles and self-healing agents on healing different initial widths were elucidated by crack microscopic observation tests.Graphical abstract

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“…Various approaches have been utilized to obtain self-healing concretes [4,5]. For example, capsules inside the concrete structure contain an adhesive solution that restores the cracks automatically [6][7][8][9]; cementitious materials have been used to improve the healing performance of the material itself [10][11][12][13][14][15][16][17][18][19]; bacteria have been used to induce the precipitation of healing substances [20][21][22][23][24]; and expansive agents have been used to seal cracks [25][26][27][28][29][30][31]. Other studies have also examined environmental effects on self-healing, including the presence of mediating substances, moisture, dry-wet cycles, age, healing time, and temperature [6,28,[32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Self-Healing Properties of OPC-Slag Cement Immersed in Seawater Using UPV Measurements

Kang,

Park,

Kim

2023

Materials

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In this study, OPC-slag cement, which partially replaced ground granulated blast-furnace slag (GGBFS), was immersed in seawater at three temperatures and the self-healing effect was evaluated through ultrasonic pulse velocity (UPV) measurement. In addition, test specimens without cracks were immersed and cured in the same seawater environment to compare the characteristics of UPV and crack-healing effects. The results of the study showed that increasing the GGBFS content or immersion temperature improved the healing effect up to 30 days after immersion, but there was no significant effect after 30 days of immersion. In a saltwater environment, a thick layer of brucite was deposited near the crack, blocking the inflow of seawater and impeding the formation of additional healing material. According to visual observation, the crack entrance appears to have been covered and healed by the brucite layer. However, the brucite layer in the crack area increases the UPV in the early stages of immersion, which may lead to a misconception that it is self-healed, and there is a possibility of overestimating the self-healing effect.

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Durability assessment of self-healing in ordinary Portland cement concrete containing chemical additives

Cited by 23 publications

References 76 publications

Study on the Synergistic Effect of Superabsorbent Polymer and Crystalline Admixture on Self-Healing Performance of Mortar Based on Image Binarization Method

Study on the Synergistic Effect of Superabsorbent Polymer and Crystalline Admixture on Self-Healing Performance of Mortar Based on Image Binarization Method

Statistical and experimental study on microcrack of mortar by a self-healing agent of bacteria adsorbed by expanded perlite

Evaluation of Self-Healing Properties of OPC-Slag Cement Immersed in Seawater Using UPV Measurements

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