The use of low alkalinity MgO-SiO2 formulation to encapsulate bacteria for self-healing concrete

Xiao, Xi; Ho, Daryl; Yang, En-Hua

doi:10.1016/j.conbuildmat.2023.132908

Cited by 7 publications

(1 citation statement)

References 36 publications

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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].…”

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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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