發(fā)布時間：2018-07-20 17:35

【摘要】：瀝青路面在低溫環(huán)境下產(chǎn)生的路面開裂和路面結(jié)霜凝冰，不僅嚴(yán)重影響路面的使用性能與壽命，還會造成嚴(yán)重的交通安全問題，一直是困擾國內(nèi)外道路工程界的主要問題。已有相關(guān)研究主要通過瀝青路面低溫抗裂性能試驗方法與評價指標(biāo)研究改善瀝青混合料的低溫穩(wěn)定性，采用人工、機(jī)械、化學(xué)、熱力等方式實現(xiàn)路面融冰化雪，這些被動應(yīng)對技術(shù)措施雖起到了一定積極作用，但瀝青路面低溫病害仍普遍出現(xiàn)。項目組前期研究中研制了瀝青混合料用微膠囊相變調(diào)溫劑，提高了瀝青混合料應(yīng)對低溫環(huán)境的自主調(diào)溫能力，但對其調(diào)溫指標(biāo)與效果的研究尚不全面。 本研究利用摻加微膠囊相變調(diào)溫劑的瀝青混合料制作了瀝青混合料室外立方體模型，通過對模型在室外實際環(huán)境條件下進(jìn)行實時溫度監(jiān)測與分析，研究模型內(nèi)部溫度場分布和特征溫度界面的變化情況，得出了微膠囊相變調(diào)溫瀝青混合料的傳熱一般規(guī)律以及影響其傳熱性能的外界環(huán)境因素。在此基礎(chǔ)上，提出潛熱積溫值和潛熱調(diào)溫指數(shù)作為衡量微膠囊相變調(diào)溫劑潛熱調(diào)溫效果的評價指標(biāo)，有效表征了調(diào)溫劑相變潛熱調(diào)溫能力和效率。揭示了潛熱作用時間域和溫度域?qū)υu價指標(biāo)的交互影響，分析了在不同外界升降溫環(huán)境下，溫度域和時間域的變化對潛熱積溫值和潛熱調(diào)溫指數(shù)的影響，揭示微膠囊相變調(diào)溫劑在不同相變潛熱階段內(nèi)的調(diào)溫機(jī)理�；谖⒛z囊相變調(diào)溫劑相變潛熱過程中時間域與溫度域之間的轉(zhuǎn)換關(guān)系，提出了調(diào)溫劑有效發(fā)揮相變潛熱作用的時間域和溫度域范圍，，建立了潛熱積溫值與時間域和溫度域的關(guān)系式，確定了調(diào)溫劑有效發(fā)揮相變潛熱作用的潛熱調(diào)溫指數(shù)最低值要求，綜合提出了微膠囊相變調(diào)溫劑潛熱調(diào)溫效果的評價指標(biāo)要求。
[Abstract]:The cracking and frosting of asphalt pavement in low temperature environment not only seriously affect the pavement performance and service life, but also cause serious traffic safety problems, which has been the main problem of road engineering at home and abroad. The existing research mainly through the asphalt pavement low-temperature crack resistance test method and evaluation index research to improve the asphalt mixture low-temperature stability, using artificial, mechanical, chemical, thermal and other ways to achieve road ice and snow, These passive technical measures have played a positive role, but asphalt pavement low-temperature disease is still widespread. In the previous research of the project group, the microencapsulated phase change temperature-regulating agent for asphalt mixture was developed, which improves the ability of asphalt mixture to adjust temperature independently in low temperature environment, but the research on its temperature regulation index and effect is not comprehensive. In this paper, an outdoor cube model of asphalt mixture is made by adding microencapsulated phase change thermostat, and the real time temperature monitoring and analysis of the model is carried out under the condition of outdoor actual environment. The distribution of temperature field in the model and the change of characteristic temperature interface are studied. The general rules of heat transfer of microencapsulated phase-change and temperature-adjusted asphalt mixture and the external environmental factors affecting its heat transfer performance are obtained. On this basis, the latent heat accumulated temperature value and latent heat regulating index are put forward as the evaluation indexes to evaluate the latent heat regulation effect of microencapsulated phase change thermostats, and the capability and efficiency of latent heat regulation of microencapsulated phase change thermostats are effectively characterized. The interaction of latent heat action time domain and temperature domain on the evaluation index is revealed, and the influence of temperature domain and time domain on latent heat accumulated temperature and latent heat regulation index is analyzed. The temperature regulation mechanism of microencapsulated phase change thermostats in different phase change latent heat stage was revealed. Based on the relationship between time domain and temperature domain in the process of phase change latent heat of microencapsulated phase change thermostats, the time domain and temperature domain range of thermostat to exert the latent heat effect of phase change are put forward. The relationship between latent heat accumulated temperature value and time domain and temperature domain was established. The minimum value of latent heat regulation index was determined, and the evaluation index of latent heat regulation effect of microencapsulated phase change thermostat was put forward.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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