Development of shape memory polyurethane based sealant for concrete pavement

Shen, Dongya; Shi, Shuping; Xu, Tao; Huang, Xiaoming; Liao, Gongyun; Chen, Jun

doi:10.1016/j.conbuildmat.2018.04.154

Cited by 50 publications

(17 citation statements)

References 41 publications

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“…It can be seen in Figure 2 a and Table 1 that the T g decreased slightly from 52.9 to 50.4 °C with the addition of SiO 2 , which is because the incorporated SiO 2 disturbed the symmetry and orderness of the SMPU molecular chains, and prevented the crystallization of SMPU [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

“…On one hand, as the SiO 2 particles have a large specific surface area, the friction force between SiO 2 particles and molecular chain in the SMPU matrix increased, it needs more energy to make it easier to move the molecular chain segments. On the other hand, SiO 2 dispersion was more uniform; on the basis of no agglomeration, it can effectively fill the pores of pure SMPU, which is caused by the violent reaction releasing a lot of heat during the preparation process, increasing the dense structure of SMPU, thus making the free curling of the chain segment take a longer time, so the width of the tan peak becomes larger, and the performance of the composite system is better [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen from Figure 4 a and Table 2 that the intensities of the diffraction peak of SiO 2 /SMPU at 20.5° were slightly decreased and the position of the diffraction peak was basically the same, while the crystallite size and crystallinity were also slowly reduced, and the FWHM became broader with the added SiO 2 . This can be attributed to the fact that the added SiO 2 particles affect the motion of molecular chains in SMPU, then the orderness of chain segments is decreased and it is difficult to form a stable aggregation [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

“…SMPUs have been widely studied in the past decades. It has been found that SMPUs have obvious shortcomings such as lower mechanical strength, recovery force, and poor thermal stability [ 11 ]. These factors greatly limit the application of SMPU.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Difference in Molecular Orientation and Interphase Structure of SiO2/Shape Memory Polyurethane in Original, Programmed and Recovered States during Shape Memory Process

Shi

Wang

et al. 2020

Polymers

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In order to further understand the shape memory mechanism of a silicon dioxide/shape memory polyurethane (SiO2/SMPU) composite, the thermodynamic properties and shape memory behaviors of prepared SiO2/SMPU were characterized. Dynamic changes in the molecular orientation and interphase structures of SiO2/SMPU during a shape memory cycle were then discussed according to the small angle X-ray scattering theory, Guinier’s law, Porod approximation, and fractal dimension theorem. In this paper, a dynamic mechanical analyzer (DMA) helped to determine the glass transition start temperature (Tg) by taking the onset point of the sigmoidal change in the storage modulus, while transition temperature (Ttrans) was defined by the peak of tan δ, then the test and the calculated results indicated that the Tg of SiO2/SMPU was 50.4 °C, and the Ttrans of SiO2/SMPU was 72.18 °C. SiO2/SMPU showed good shape memory performance. The programmed SiO2/SMPU showed quite obvious microphase separation and molecular orientation. Large-size sheets and long-period structures were formed in the programmed SiO2/SMPU, which increases the electron density difference. Furthermore, some hard segments had been rearranged, and their gyration radii decreased. In addition, several defects formed at the interfaces of SiO2/SMPU, which caused the generation of space charges, thus leading to local electron density fluctuations. The blurred interphase structure and the intermediate layer formed in the programmed SiO2/SMPU and there was evident crystal damage and chemical bond breakage in the recovered SiO2/SMPU. Finally, the original and recovered SiO2/SMPU samples belong to the surface fractal system, but the programmed sample belongs to the mass fractal and reforms two-phase structures. This study provides an insight into the shape memory mechanism of the SiO2/SMPU composite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Difference in Molecular Orientation and Interphase Structure of SiO2/Shape Memory Polyurethane in Original, Programmed and Recovered States during Shape Memory Process

Shi

Wang

et al. 2020

Polymers

Self Cite

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“…Since then, several SMAs with exceptional thermo-mechanical and thermo-electrical properties have been developed [ 79 ]. For example, nitinol is a highly elastic alloy that demonstrates the shape memory effect and capable of reversing to its pre-established form upon heat exposure [ 80 ]. Its super-elasticity permits to withstand a major inelastic deformation and returns to its original form once the load is removed.…”

Section: Mechanism Of Self-healing In Cementitious Materialsmentioning

confidence: 99%

Biomimetic Self-Healing Cementitious Construction Materials for Smart Buildings

Shah

Huseien

2020

Biomimetics

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Climate change is anticipated to have a major impact on concrete structures through increasing rates of deterioration as well the impacts of extreme weather events. The deterioration can affect directly or indirectly climate change in addition to the variation in the carbon dioxide concentration, temperature and relative humidity. The deterioration that occurs from the very beginning of the service not only reduces the lifespan of the concretes but also demands more cement to maintain the durability. Meanwhile, the repair process of damaged parts is highly labor intensive and expensive. Thus, the self-healing of such damages is essential for the environmental safety and energy cost saving. The design and production of the self-healing as well as sustainable concretes are intensely researched within the construction industries. Based on these factors, this article provides the materials and methods required for a comprehensive assessment of self-healing concretes. Past developments, recent trends, environmental impacts, sustainability, merits and demerits of several methods for the production of self-healing concrete are discussed and analyzed.

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Effect of carbon fiber on the properties of polymer cement based building sealant

Wang

Bai

Ren

et al. 2022

J of Applied Polymer Sci

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The working property, bond property, and mechanical property of five kinds of polymer cement based building sealant (PCBS) with different carbon fiber content were tested. The effect of carbon fiber on the properties of PCBS was discussed by analyzing the variation of the leveling performance, consistency, low temperature flexibility, surface dry time, elastic recovery rate, tensile mechanical property, and shear mechanical property of PCBS with carbon fiber content. And the modification mechanism of carbon fiber on PCBS was interpreted using scanning electron microscopy and mercury intrusion porosimetry techniques. The results shows that PCBS still has good working property and bonding property with carbon fiber addition. As the carbon fiber content increases, the leveling performance and low temperature flexibility of PCBS are unaltered., the consistency increases, while the surface drying time and elastic recovery rate decrease. The tensile and shear mechanical properties of PCBS can be improved by adding carbon fiber. With the increase of carbon fiber content, the strength performance indexes of PCBS increase, while the energy consumption performance indexes first increased followed by a decrease. When the carbon fiber content is 0.1%, the properties of PCBS is the best. The pore structure of PCBS gradually deteriorates, and the total porosity and the percentage of macropores increase with carbon fiber addition. Carbon fiber primarily exerts cracking resistance and internal deterioration effects in PCBS.

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Development of shape memory polyurethane based sealant for concrete pavement

Cited by 50 publications

References 41 publications

The Difference in Molecular Orientation and Interphase Structure of SiO2/Shape Memory Polyurethane in Original, Programmed and Recovered States during Shape Memory Process

The Difference in Molecular Orientation and Interphase Structure of SiO2/Shape Memory Polyurethane in Original, Programmed and Recovered States during Shape Memory Process

Biomimetic Self-Healing Cementitious Construction Materials for Smart Buildings

Effect of carbon fiber on the properties of polymer cement based building sealant

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