【摘要】：憑借其優(yōu)越的路用性能和行車(chē)舒適性,瀝青路面在國(guó)內(nèi)外高級(jí)公路和城市道路中得到了廣泛應(yīng)用。但由于受自然環(huán)境和車(chē)輛荷載的長(zhǎng)期作用,瀝青混合料的力學(xué)性能隨著使用年限的增加而逐年降低,進(jìn)而影響瀝青路面的使用功能。目前,對(duì)瀝青混合料老化的研究大都是從瀝青基本性能的老化及其混合料路用性能的老化這兩方面開(kāi)展的,而從實(shí)際路面結(jié)構(gòu)角度探討橡膠瀝青加鋪層老化行為的研究鮮有涉足。本文從橡膠瀝青基本性能、橡膠瀝青混合料路用性能和橡膠瀝青加鋪層減振吸能等方面入手,分析了老化作用對(duì)橡膠瀝青及其混合料力學(xué)性能的影響程度。從瀝青基本性能如針入度、延度、軟化點(diǎn)、粘度和車(chē)轍因子等方面入手,研究不同橡膠粉摻量下橡膠瀝青基本性能變化規(guī)律,確定適宜的橡膠粉摻量。采用對(duì)比試驗(yàn),研究橡膠瀝青和基質(zhì)瀝青在不同老化程度下基本性能的變化規(guī)律,試驗(yàn)結(jié)果說(shuō)明橡膠瀝青具有較好的抗老化性能。為了研究橡膠瀝青混合料的高溫穩(wěn)定性、水穩(wěn)定性和疲勞性能,在室內(nèi)條件下,采用車(chē)轍試驗(yàn)、浸水馬歇爾試驗(yàn)和劈裂試驗(yàn)進(jìn)行不同老化程度下的對(duì)比試驗(yàn),分析了老化作用對(duì)橡膠瀝青和基質(zhì)瀝青混合料路用性能的影響程度。通過(guò)落球沖擊試驗(yàn)開(kāi)展了加鋪層老化行為下路面減振吸能衰變規(guī)律的研究。試驗(yàn)結(jié)果表明：在沖擊荷載作用下,加鋪層的振動(dòng)響應(yīng)是一個(gè)逐漸衰減的過(guò)程,加鋪層老化程度越高減振吸能衰減越明顯；振動(dòng)響應(yīng)幅值隨落球高度的增加呈線性增長(zhǎng)趨勢(shì),而綜合考慮短期老化和長(zhǎng)期老化效果,加鋪層路面振動(dòng)響應(yīng)符合指數(shù)關(guān)系式；當(dāng)滿(mǎn)足測(cè)點(diǎn)位置與振動(dòng)信號(hào)源距離相等且測(cè)點(diǎn)位置力學(xué)邊界條件相似時(shí),加鋪層路面振動(dòng)能量的傳播具有對(duì)稱(chēng)性。
[Abstract]:With its superior road performance and driving comfort, asphalt pavement has been widely used in advanced highways and urban roads at home and abroad. However, due to the long-term effect of natural environment and vehicle load, the mechanical properties of asphalt mixture decrease year by year with the increase of service life, and then affect the function of asphalt pavement. At present, the research on the aging of asphalt mixture is mainly carried out from the aging of asphalt basic properties and the aging of pavement performance of asphalt mixture. However, the research on the aging behavior of rubber asphalt overlay from the point of view of actual pavement structure is seldom involved. Based on the basic properties of rubber asphalt, the road performance of rubber asphalt mixture and the vibration and energy absorption of rubber asphalt overlay, the influence of aging on the mechanical properties of rubber asphalt and its mixture is analyzed in this paper. Based on the basic properties of asphalt, such as penetration, ductility, softening point, viscosity and rutting factor, the changes of basic properties of rubber asphalt with different rubber powder content were studied, and the suitable rubber powder content was determined. The changes of basic properties of rubber asphalt and base asphalt under different aging degrees were studied by contrast test. The results show that rubber asphalt has better aging resistance. In order to study the high temperature stability, water stability and fatigue performance of rubber asphalt mixture, under indoor conditions, rutting test, immersion Marshall test and split test were carried out under different aging degree. The influence of aging on pavement performance of rubber asphalt and base asphalt mixture was analyzed. The law of vibration and energy absorption decay of pavement under overlay aging behavior was studied by ball drop impact test. The experimental results show that the vibration response of the overlay is a gradual attenuation process under the impact load, the higher the aging degree of the overlay is, the more obvious the damping energy attenuation is, and the amplitude of the vibration response increases linearly with the increase of the ball drop height. Considering the effect of short-term aging and long-term aging, the vibration response of overlay pavement accords with exponential relation, when the distance between measuring point and vibration signal source is equal and the mechanical boundary condition of measuring point position is similar, The propagation of vibration energy of overlay pavement has symmetry.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U414

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本文編號(hào)：2172714