Properties and self-healing effect of shape memory polyurethane-based sealant for cement concrete pavement joint
To develop smart sealant with shape memory and self-healing properties for cement pavement joint, silicon dioxide (SiO2) was incorporated into shape memory polyurethane (SMPU) to enhance its shape memory and mechanical properties, and polycaprolactone (PCL) was added to improve its self-healing func...
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| Vydané v: | Construction & building materials Ročník 498; s. 144038 |
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| Hlavní autori: | , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
Elsevier Ltd
07.11.2025
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| Predmet: | |
| ISSN: | 0950-0618 |
| On-line prístup: | Získať plný text |
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| Shrnutí: | To develop smart sealant with shape memory and self-healing properties for cement pavement joint, silicon dioxide (SiO2) was incorporated into shape memory polyurethane (SMPU) to enhance its shape memory and mechanical properties, and polycaprolactone (PCL) was added to improve its self-healing function. The composite was programmed to endow two-dimensional (2D) shape memory performance for using as joint sealant. The excitation response temperature of unprogrammed PCL/SiO2/SMPU was determined as 71 ℃. The phase structure, viscoelastic performance, 2D shape memory, mechanical and repeated self-healing properties of joint sealant were investigated. The results show that PCL and SMPU are physically mixed. The added PCL does not significantly affect the phase transition temperature of SMPU, but causes a slight decrease in the crystallinity of joint sealant. The optimal dosage of PCL increases storage modulus and loss modulus of joint sealant, ensuring sufficient shape recovery ability and viscosity for shape memory and self-healing. The shape memory performance of joint sealant is a prerequisite for its self-healing function. Inadequate PCL does not perform sufficient self-healing properties, while excessive PCL reduces the mechanical properties of joint sealant. The smart joint sealant containing 10 wt% PCL exhibits the best mechanical, viscoelastic, shape memory, and self-healing properties. The self-healing rate reaches 61.03 %, and even after five loading-healing cycles, the self-healing rate is still 30.17 %. After self-healing, the micro-crack in joint sealant is almost completely healed. Joint sealant can maintain good performance even after multiple damage-healing cycles. The smart joint sealant can enhance the durability of joint and extend the service life of concrete pavement.
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•Smart joint sealant with shape memory and self-healing properties is developed.•A biaxial programming is used to endow 2D shape memory properties to sealant.•Shape memory is a necessary prerequisite for self-healing of smart joint sealant.•The joint sealant with a 10 % PCL content shows the best self-healing properties.•The two-step self-healing behavior of developed smart joint sealant is repeatable. |
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| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2025.144038 |