本文關鍵詞：凍融—鹽分侵蝕作用下瀝青混凝土疲勞性能試驗與分析　出處：《安徽理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 瀝青混凝土 凍融循環(huán) 氯鹽侵蝕 瀝青類型 疲勞壽命 超聲波檢測

【摘要】：路面疲勞損傷是水、溫度和荷載共同作用的結(jié)果,在此過程水的存在和溫度的反復變化改變了無水情況下對路面的單一破壞作用,使整個疲勞破壞過程變得更加復雜；另一方面,反復的疲勞荷載、冬季噴灑的除冰鹽也加速了瀝青路面的水溫損害。多年來,瀝青路面的疲勞性能一直是道路工程研究的重點。本文根據(jù)華東地區(qū)的冬季氣溫,在總結(jié)國內(nèi)外學者研究的基礎上,采用間接拉伸疲勞試驗探究瀝青混凝土的疲勞壽命的規(guī)律。 通過室內(nèi)試驗從以下五方面進行研究：1.瀝青混凝土試件在不同凍融次數(shù)下疲勞壽命；2.鹽分侵蝕對瀝青混凝土疲勞壽命的影響；3.不同凍融溫度下瀝青混凝土的疲勞壽命；4.不同類型瀝青混凝土在相同條件下的疲勞壽命；5.通過超聲波檢測,預測瀝青混凝土的劈裂強度。分別分析了凍融次數(shù),氯鹽侵蝕,瀝青類型,凍融溫度對瀝青混凝土疲勞壽命的影響。主要結(jié)論如下： (1)隨著凍融次數(shù)的增加,瀝青混凝土的疲勞壽命呈下降趨勢。在-5℃-15℃凍融溫度區(qū)間,經(jīng)清水浸泡的AH-70號基質(zhì)瀝青混凝土經(jīng)過2、4、6、8次凍融循環(huán)后,疲勞壽命分別為未凍融循環(huán)試件的75.1%,62.8%,49.6%,40.4%。 (2)在鹽凍作用下,瀝青混凝土表面出現(xiàn)剝落,掉粒現(xiàn)象。在氯鹽侵蝕和凍融破壞的雙重影響下,瀝青混凝土的疲勞壽命呈明顯下降趨勢。在相同的凍融溫度和相同的凍融次數(shù)下,被鹽分侵蝕的瀝青混凝土試件的疲勞壽命低于經(jīng)清水浸泡的瀝青混凝土試件。在-5℃～15℃凍融溫度區(qū)間,經(jīng)鹽水浸泡的AH-70號基質(zhì)瀝青混凝土經(jīng)過2、4、6、8次凍融循環(huán)后,疲勞壽命分別為未凍融循環(huán)試件的72.9%,58.1%,47.0%,28.1%。 (3)分別在-5℃-15℃、-10℃-10℃、-15℃C-5℃三個溫度區(qū)間對瀝青混凝土進行凍融循環(huán)后,對其進行間接拉伸疲勞試驗,發(fā)現(xiàn)溫度越低,造成的鹽凍破壞越大；低溫持續(xù)的時間越長,也會加大鹽凍的破壞程度。 (4)在相同的凍融次數(shù)和凍融溫度下,SBS改性瀝青混凝土的疲勞壽命高于AH-70號基質(zhì)瀝青混凝土疲勞壽命,并且隨著凍融次數(shù)的增加,SBS改性瀝青混凝土的疲勞壽命的降低速度低于AH-70號基質(zhì)瀝青混凝土。在-5℃-15℃凍融溫度區(qū)間,經(jīng)清水浸泡后AH-70號基質(zhì)瀝青混凝土經(jīng)過2、4、6、8次凍融循環(huán)后,疲勞壽命分別為未凍融循環(huán)試件的75.1%,62.8%,49.6%,40.4%。SBS改性瀝青混凝土經(jīng)過2、4、6、8次凍融循環(huán)后,疲勞壽命分別為未凍融循環(huán)試件的80.0%,71.8%,65.9%,56.0%。 (5)對不同試驗條件下的瀝青混凝土試件進行超聲波檢測,根據(jù)試驗數(shù)據(jù)得到AH-70號基質(zhì)瀝青混凝土和SBS改性瀝青混凝土在凍融循環(huán)后波速和劈裂強度的回歸方程,分別為fc=0.1507e(0.0005v),R2=0.9196, fc=0.2594e0.0004v,R2=0.9297。利用該回歸方程可以預測未進行劈裂試驗試件的劈裂強度。 綜上所述,凍融循環(huán)和鹽分侵蝕對瀝青混凝土的疲勞壽命有明顯影響,采用SBS改性瀝青混凝土可以減小凍融損害和鹽分侵蝕對疲勞壽命的影響。在基質(zhì)瀝青中摻入SBS改性劑后,提高了瀝青的軟化點,降低了其脆點。工程應用中,應進一步加強對SBS改性瀝青的研究,以減少凍融循環(huán)對瀝青路面的損害。
[Abstract]:The pavement fatigue damage is water, the combined effect of temperature and load the results of repeated changes in the process of the existence of water and temperature change of the single damage to the pavement without water, the fatigue failure process becomes more complex; on the other hand, the fatigue load repeatedly, spraying winter deicing salt also accelerated temperature the damage of asphalt pavement. For many years, the fatigue performance of asphalt pavement has been the focus of road engineering research. According to the East China winter temperature, summarizes the domestic and foreign scholars, the fatigue life of the indirect tensile fatigue test of asphalt concrete law.
Study from the following five aspects: 1. through the laboratory test of asphalt concrete specimens under different freeze-thaw cycles fatigue life; 2. the erosion of salt effect on fatigue life of asphalt concrete; 3. different freeze-thaw fatigue life of asphalt concrete temperature; fatigue life of 4. different types of asphalt concrete under the same conditions; 5. by ultrasonic detection and the prediction of asphalt concrete splitting strength were analyzed. The freeze-thaw cycles and chloride corrosion, asphalt type, effect of freeze-thaw temperature on fatigue life of asphalt concrete. The main conclusions are as follows:
(1) increase with the number of freeze-thaw cycles, the fatigue life of asphalt concrete is decreased. At -5 DEG -15 DEG freeze-thaw temperature range, the AH-70 asphalt concrete water soaking after 2,4,6,8 freeze-thaw cycles, the fatigue life were not freeze-thaw cycle samples of 75.1%, 62.8%, 49.6%, 40.4%.
(2) in salt freezing under the action of the asphalt concrete surface spalling, dropped phenomenon. In chlorine salt erosion and freezing thawing damage under the double impact, the fatigue life of asphalt concrete was significantly decreased. In the same freeze-thaw temperature and the same number of freeze-thaw, by the fatigue life of asphalt salt erosion the concrete specimen is below the water soaked asphalt concrete specimens. In the -5 to 15 DEG C freeze-thaw temperature range, the AH-70 matrix asphalt concrete brine after 2,4,6,8 freeze-thaw cycles, the fatigue life were not freeze-thaw cycle samples of 72.9%, 58.1%, 47%, 28.1%.
(3) at -5 DEG -15 DEG -10 DEG C, -10, -15 three C-5 DEG C temperature range of asphalt concrete after freeze-thaw cycles, indirect tensile fatigue test on it, found that the lower the temperature, the greater the damage caused by salt freezing at low temperature; the longer the duration, will also increase the salt freeze damage.
(4) in the same number of freeze-thaw cycles and freeze-thaw temperature, the fatigue life of SBS modified asphalt concrete is higher than that of the fatigue life of AH-70 asphalt concrete, and with the increase in the number of freezing and thawing, the fatigue life of SBS modified asphalt concrete and the decrease rate of less than AH-70, the matrix asphalt concrete at -5 DEG -15 DEG. The freeze-thaw temperature interval, the water soaked AH-70 matrix asphalt concrete after 2,4,6,8 freeze-thaw cycles, the fatigue life were not freeze-thaw cycle samples of 75.1%, 62.8%, 49.6%, 40.4%.SBS modified asphalt concrete after 2,4,6,8 times of freeze-thaw cycles, the fatigue life was not the freeze-thaw cycle test piece 80%, 71.8%, 65.9%, 56.0%.
(5) of the asphalt concrete under different test conditions were ultrasonic testing, according to the test data of AH-70 asphalt concrete and SBS modified asphalt concrete under cyclic freezing and thawing velocity and splitting the regression equation of the fracture strength, respectively fc=0.1507e (0.0005v) 0.9196, R2=, fc=0.2594e0.0004v, R2=0.9297. by using the regression equation prediction without splitting test specimen splitting strength.
In summary, freeze-thaw and salt erosion fatigue life of asphalt concrete has been significantly affected by SBS modified asphalt concrete can reduce the freeze-thaw damage and erosion of salt effect on fatigue life. The incorporation of SBS in the asphalt modifier, improve the softening point of asphalt, reduce the brittle point. In the application, should strengthen the research on SBS modified asphalt, freeze-thaw cycle to reduce the damage of the asphalt pavement.

【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414

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