کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6713537 | 1428732 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development of shape memory polyurethane based sealant for concrete pavement
ترجمه فارسی عنوان
توسعه سیلانت های پلی اورتان برای آسفالت بتونی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
چکیده انگلیسی
Expansion joint failure is one of important causes to cause concrete pavement damages. To develop a new sealant to effectively seal expansion joint on concrete pavement, titanium dioxide/shape memory polyurethane (TiO2/SMPU) composites with a tailored transition temperature (Tt) was prepared, and effects of TiO2 content on various properties of TiO2/SMPU composites were discussed. The results indicate that TiO2 nanoparticles are uniformly physically filled in SMPU pores and wrapped by SMPU to form a compact skeleton structure when TiO2 content is suitable. The tailored shape memory Tt of TiO2/SMPU composites can be used as the shape memory switching temperature to match the working temperature of expansion joint in China. Also, TiO2/SMPU composites include amorphous phases or microcrystal structures which are dominated by the presence of crystalline rutile TiO2. The incorporation of TiO2 leads to the decrease in crystallinity of TiO2/SMPU composites. Additionally, a suitable content of TiO2 can obviously increase the absorptivity of SMPU to UV light in the wavelength range from 300â¯nm to 400â¯nm, and also improve the reflectivity to visible light, lowering photo-aging properties of SMPU. Further, TiO2 content shows a slight effect on shape fixity ratio of SMPU, but has an obvious influence on shape recovery ratio. Prepared TiO2/SMPU composites show satisfactory shape memory property after a two-stage biaxial programming process. Finally, mechanical properties of SMPU are improved by a suitable TiO2 content. The improvement in mechanical properties of TiO2/SMPU composites can better accommodate the working conditions of sealant. TiO2 content of 3% is proposed to prepare TiO2/SMPU composites with a specially tailored shape memory Tt, which can meet engineering requirements of expansion joints when used as a sealant of concrete pavement.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 174, 20 June 2018, Pages 474-483
Journal: Construction and Building Materials - Volume 174, 20 June 2018, Pages 474-483
نویسندگان
Dongya Shen, Shuang Shi, Tao Xu, Xiaoming Huang, Gongyun Liao, Jun Chen,