The use of polyurethane for asphalt pavement engineering applications: A state-of-the-art review

Lin, Cong; Yang, Fan; Guo, Guihong; Ren, Minda; Shi, Jiachen; Tan, Lihai

doi:10.1016/j.conbuildmat.2019.07.213

Cited by 151 publications

(39 citation statements)

References 96 publications

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“…Polyurethane has interesting features like high elasticity, flexibility, chemical resistance, oxidation resistance, (a, b and c) indicate a statistically significant difference between aligner types in each solution at each time point (P < 0.05). n/a was used as the t-test demonstrated a different effect among the two cleansers as described in the results section mechanical strength and ease of processing [7,24]. In a previous study on mechanical and chemical properties of aligners, thermoplastic polyurethane used in the INV devices showed high hardness and elastic modulus but less creep resistance [17].…”

Section: Discussionmentioning

confidence: 99%

“…At first, the water molecules are linked to the surface of the aligner before being internalized within the plastic [28]. The interactions between water and polyurethane are facilitated by the fact that this material contains polar carbamate groups -NHCOO-that encourage hydrophilic links with pigments from the aqueous solutions [7,24]. Furthermore, different grades exist among polyurethanes, which could explain the differences between INV and CC.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, different grades exist among polyurethanes, which could explain the differences between INV and CC. The polyols that are contained in polyurethane are mainly divided into polyethers and polyesters [24]. Ester groups in polyester polyols have an important polarity, promoting the formation of hydrogen bonds, whereas ether groups are more resistant to hydrolysis and contain more flexible segments [24].…”

Section: Discussionmentioning

confidence: 99%

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Colorimetric and spectrophotometric measurements of orthodontic thermoplastic aligners exposed to various staining sources and cleaning methods

et al. 2020

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Background: Manufacturers of orthodontic aligners suggest that users remove appliances every time they consume solid foods or any drink (except water). This is to avoid a color change within the clear thermoplastic material of which they are made. However, limited quantitative evidence exists to guide users and practitioners in this regard. Herein, we evaluated the color stability of the polymer forming three different American brands of aligners and the stain-removal potential of two cleansers to provide such guidelines. Methods: The removable appliances (300 specimens, 100 per brand) were exposed to different staining agents common in a regular diet (coffee, black tea, red wine, cola) or to a control solution in vitro over 12 h or 7 days. The three brands evaluated were Invisalign®, ClearCorrect® and Minor Tooth Movement®. These were then cleaned by using either Invisalign® cleaning crystals or the Cordless Sonic Cleaner combined with a Retainer Brite® tablet. The CIELAB color space approach was used to compare color changes (ΔE) in aligners before immersion (T0), after a 12h exposure (T1), after a 7-day exposure (T2) and after cleaning (T3). Statistical methods (Levene's test, ANOVA, Brunner-Langer model, Tukey's range test and t-test) were used to identify interactions between the brands themselves or between the brands and the cleaning methods. Statistical analyses were performed at the .05 significance level. Results: A 12-h or 7-day exposure to instant coffee or red wine significantly colored the Invisalign® aligners compared to the two other brands. Black tea created an important extrinsic color change for all three brands after 7 days. Clinically, both cleaning methods showed a better efficacy in removing stains from black tea compared to other staining agents. Conclusions: The Invisalign® aligners were more prone to pigmentation than the ClearCorrect® or the Minor Tooth Movement® devices after an exposure to coffee or red wine. Black tea caused important stains on the surface of the three tested brands. Both cleansing methods performed similarly.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Colorimetric and spectrophotometric measurements of orthodontic thermoplastic aligners exposed to various staining sources and cleaning methods

et al. 2020

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“…Formula (3) is a piecewise function with jump discontinuities. Because the temperature field distribution in the frozen soil subgrade is continuous, Formula (3) can be expanded into a continuous cosine trigonometric form based on the principle of Fourier series correlation [29][30][31][32], as shown in Formula (4). In this calculation, the order k can be set as 30 to meet engineering accuracy requirements.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Temperature Field Variation Law of Low Exothermic Polymer Grouting Material in Repairing Void Damage of Frozen Soil Subgrade

Zhang

Wang

Zhong

et al. 2021

Advances in Materials Science and Engineering

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In this study, the self-developed grouting mold was used to study the heat release characteristics of different density polymer grouting material under different temperature conditions. The spatial distribution characteristics of the frozen soil subgrade temperature field under the effect of polymer grouting repair were analyzed. Further, the rules governing the temperature change of a frozen soil subgrade monitoring point under the effect of polymer grouting repair were studied. The heat transfer mechanism of polymer grouting material in frozen soil subgrade was revealed. The results showed that in the void region of the frozen soil subgrade, a discontinuity zone appeared in the temperature field distribution isotherm due to the effect of voids; this zone exhibited a layered radioactive distribution along the two sides of the void area. Furthermore, during the exothermic stage of the curing reaction, the temperature distribution isotherms changed from a layered radioactive distribution to a ring distribution that decreased from the inside to outside. During the natural cooling process, the peripheral temperature of the ring isotherm first decreased and a negative temperature ring-shaped isotherm gradually formed. Finally, the upper boundary of the influence of the heat energy released by the curing reaction on the frozen soil subgrade temperature field was determined to be 30 cm, and the lower boundary was 20 cm.

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“…Cong et al (2018) conducted studies on the PPMs and asphaltbonded porous mixtures (APMs), which showed that the PPM obtained three times' higher stability and over one order of magnitude greater fatigue life than APM. Polyurethane mixtures are mainly used in the following fields: OGFC, PPM, PERS, and self-stressing deicing mixture (Cong et al, 2019). Wang et al (2018) developed the PPC as the bridge deck pavement material, evaluated its road performance, and proposed that the residual splitting strength under freeze-thaw cycles should be used as the water stability index of PPC.…”

Section: Introductionmentioning

confidence: 99%

An Indoor Laboratory Simulation and Evaluation on the Aging Resistance of Polyether Polyurethane Concrete for Bridge Deck Pavement

Meng

Zhang

et al. 2020

Front. Mater.

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Polyether polyurethane concrete (PPC) is a new engineering material used for bridge deck pavement. In this article, the aging resistance performance of PPC for long-term service is evaluated. Based on the actual climate and environment conditions of bridge deck pavement, the indoor laboratory simulation considering various environmental factors was first proposed, and then the indoor accelerated aging tests of PPC were carried out. Finally, the Cantabro test, the low-temperature bending beam test, the rutting test, the splitting test under freeze-thaw cycle, and four-point bending fatigue test were conducted on the aged PPC specimens. The performances of anti-loose, resistance to permanent deformation, low temperature, water stability, and fatigue resistance were evaluated and compared with styreneic block copolymers (SBS) modified asphalt mixture (SBSM). Test results showed that PPC had good anti-aging performance, and the road performance of PPC after aging was still better than that of non-aging SBSM, which can be used for the long-term service as a bridge deck pavement material.

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The use of polyurethane for asphalt pavement engineering applications: A state-of-the-art review

Cited by 151 publications

References 96 publications

Colorimetric and spectrophotometric measurements of orthodontic thermoplastic aligners exposed to various staining sources and cleaning methods

Colorimetric and spectrophotometric measurements of orthodontic thermoplastic aligners exposed to various staining sources and cleaning methods

Temperature Field Variation Law of Low Exothermic Polymer Grouting Material in Repairing Void Damage of Frozen Soil Subgrade

An Indoor Laboratory Simulation and Evaluation on the Aging Resistance of Polyether Polyurethane Concrete for Bridge Deck Pavement

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