水溫荷耦合作用下瀝青混凝土水損機制研究
發(fā)布時間：2018-09-11 11:46
【摘要】：隨著中國高速公路事業(yè)的迅速發(fā)展，交通量的急劇增加與汽車平均行駛速度的提高等使得已建成的高等級公路出現(xiàn)超負荷運行狀況，早期破壞大面積出現(xiàn)在路面上，其中水是瀝青混凝土路面早期破壞的主要因素，水損壞現(xiàn)象是最主要、危害最大的早期損壞類型。因此，深入研究瀝青混凝土路面在水溫荷耦合作用下的水損壞機理，有利于進一步加深對瀝青路面水損壞的認識。 本文首先介紹瀝青混合料在水溫荷耦合作用下水損壞的相關理論，運用表面能理論，從瀝青與集料的粘附性能著手，運用瀝青與礦料系統(tǒng)的粘附模型，獲得瀝青與礦料系統(tǒng)粘附功和表面自由能的變化，并以此評價瀝青與礦料之間的粘附性能；運用室內(nèi)變水頭柔性側壁滲透儀測試并獲得不同空隙率的瀝青混合料與滲透系數(shù)之間的關系；通過浸水馬歇爾、浸水飛散以及凍融劈裂試驗，對瀝青混合料試件在不同溫度以及不同凍融循環(huán)方式條件下進行性能測試，獲得水溫荷耦合作用下瀝青混合料水穩(wěn)定性能的變化情況；此外，本研究采用CT儀對凍融劈裂前后的瀝青混合料試件進行CT掃描，研究獲得凍融劈裂對試件內(nèi)部的損傷狀況。 本文的主要結論如下： ①通過瀝青與集料的表面能試驗，研究得出：集料的表面能遠大于瀝青的表面能，瀝青與集料的粘附功大小受集料的影響較大，瀝青與礦料粘附過程中， SBS改性瀝青與玄武巖的粘附性較好，瀝青與礦料系統(tǒng)剝落過程中， SBS改性瀝青與石灰?guī)r之間的抗剝落能力最強。 ②通過對三種瀝青混合料（SMA-13、AC-16、AC-20）滲透性能試驗，得出滲水系數(shù)與空隙率的大小有直接關系，都隨空隙率的增大而增大，三種類型的瀝青混合料滲透系數(shù)的拐點位置與瀝青路面初期破壞的臨界值空隙率大致相同，同為8%-9%之間。 ③通過對不同空隙率的試件進行浸水馬歇爾試驗、浸水飛散試驗得出：隨著混合料空隙率的增大，混合料試件水穩(wěn)定性能受水影響程度也增大。摻入生石灰和消石灰都可以改善瀝青混合料的水穩(wěn)定性，當消石灰摻量為4%時效果最為理想，，摻入水泥后幾乎不能提高混合料水穩(wěn)定性能。 ④采用不同溫度與不同凍融循環(huán)方式來研究混合料試件在不同溫度影響狀況下的水穩(wěn)定性能，研究得出：隨著溫度的升高，三種瀝青混合料（AC-13、AM-13、OGFC-13）試件的劈裂強度都呈逐漸減小的趨勢，劈裂強度與溫度呈現(xiàn)出良好的指數(shù)相關性，相關系數(shù)R2介于0.92到0.98之間； ⑤在對混合料試件凍融劈裂后試件內(nèi)部損傷的研究中，采用CT圖像技術，并得出：瀝青混合料試件在凍融過程中，水對瀝青膠漿與集料之間的粘結性能產(chǎn)生明顯的破壞作用，在試件初始空隙率較大的地方劈裂后空隙明顯增大，混合料試件損傷發(fā)展的位置和方向與初始空隙分布密切相關；運用損傷變量定量的描述瀝青混合料在水溫荷耦合作用下發(fā)生水損破壞狀況。
[Abstract]:With the rapid development of China's highway industry, the rapid increase of traffic volume and the increase of average speed of automobiles, the built highway appears overload operation, early damage occurs in large areas on the pavement, water is the main factor of early damage of asphalt concrete pavement, water damage is the most important phenomenon. Therefore, in-depth study of the water damage mechanism of asphalt concrete pavement under the coupling action of water temperature and load will help to deepen the understanding of water damage of asphalt pavement.
In this paper, the theory of water damage of asphalt mixture under the coupling action of water temperature and load is introduced firstly. Based on the theory of surface energy and the adhesion performance between asphalt and aggregate, the change of adhesion energy and surface free energy between asphalt and aggregate is obtained by using the adhesion model of asphalt and aggregate system. The performance of asphalt mixtures with different void fractions was tested by indoor variable head flexible sidewall permeameter, and the relationship between permeability coefficient and asphalt mixtures with different void fractions was obtained. In addition, CT scans of asphalt mixtures before and after freeze-thaw splitting were carried out by using a CT scanner to study the damage of asphalt mixtures caused by freeze-thaw splitting.
The main conclusions of this paper are as follows:
(1) Through the surface energy test of asphalt and aggregate, it is concluded that the surface energy of aggregate is much greater than that of asphalt, and the adhesion work between asphalt and aggregate is greatly influenced by aggregate. In the process of adhesion between asphalt and aggregate, the adhesion between SBS modified asphalt and basalt is better, and SBS modified asphalt and stone is better during the peeling process of asphalt and aggregate system. The anti stripping ability of limestone is the strongest.
(2) Through the permeability test of three kinds of asphalt mixture (SMA-13, AC-16, AC-20), it is concluded that the permeability coefficient is directly related to the void ratio, and increases with the void ratio. The inflection point of the permeability coefficient of the three types of asphalt mixture is approximately the same as the critical value of void ratio of initial damage of asphalt pavement, which is between 8% and 9%.
(3) Marshall immersion test was carried out on the specimens with different void fraction, and the results showed that with the increase of void fraction of the mixture, the water stability of the specimens increased. The water stability of the asphalt mixture could be improved by adding quicklime and lime, and the effect was most reasonable when the content of lime was 4%. It is thought that mixing cement can hardly improve the water stability of the mixture.
The results show that with the increase of temperature, the splitting strength of three kinds of asphalt mixtures (AC-13, AM-13, OGFC-13) decreases gradually, and the splitting strength and temperature show a good exponential phase. The correlation coefficient R2 ranged from 0.92 to 0.98.
_In the study of internal damage of asphalt mixture specimens after freeze-thaw splitting, CT image technology was used, and it was concluded that: during freeze-thaw process, water had a significant destructive effect on the bond between asphalt mortar and aggregate, and the voids increased obviously after splitting at the place with larger initial void ratio, and the voids of asphalt mixture specimens increased significantly. The location and direction of damage development are closely related to the initial void distribution, and the damage variable is used to quantitatively describe the water damage of asphalt mixture under the coupling action of water temperature and load.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414
本文編號：2236602
[Abstract]:With the rapid development of China's highway industry, the rapid increase of traffic volume and the increase of average speed of automobiles, the built highway appears overload operation, early damage occurs in large areas on the pavement, water is the main factor of early damage of asphalt concrete pavement, water damage is the most important phenomenon. Therefore, in-depth study of the water damage mechanism of asphalt concrete pavement under the coupling action of water temperature and load will help to deepen the understanding of water damage of asphalt pavement.
In this paper, the theory of water damage of asphalt mixture under the coupling action of water temperature and load is introduced firstly. Based on the theory of surface energy and the adhesion performance between asphalt and aggregate, the change of adhesion energy and surface free energy between asphalt and aggregate is obtained by using the adhesion model of asphalt and aggregate system. The performance of asphalt mixtures with different void fractions was tested by indoor variable head flexible sidewall permeameter, and the relationship between permeability coefficient and asphalt mixtures with different void fractions was obtained. In addition, CT scans of asphalt mixtures before and after freeze-thaw splitting were carried out by using a CT scanner to study the damage of asphalt mixtures caused by freeze-thaw splitting.
The main conclusions of this paper are as follows:
(1) Through the surface energy test of asphalt and aggregate, it is concluded that the surface energy of aggregate is much greater than that of asphalt, and the adhesion work between asphalt and aggregate is greatly influenced by aggregate. In the process of adhesion between asphalt and aggregate, the adhesion between SBS modified asphalt and basalt is better, and SBS modified asphalt and stone is better during the peeling process of asphalt and aggregate system. The anti stripping ability of limestone is the strongest.
(2) Through the permeability test of three kinds of asphalt mixture (SMA-13, AC-16, AC-20), it is concluded that the permeability coefficient is directly related to the void ratio, and increases with the void ratio. The inflection point of the permeability coefficient of the three types of asphalt mixture is approximately the same as the critical value of void ratio of initial damage of asphalt pavement, which is between 8% and 9%.
(3) Marshall immersion test was carried out on the specimens with different void fraction, and the results showed that with the increase of void fraction of the mixture, the water stability of the specimens increased. The water stability of the asphalt mixture could be improved by adding quicklime and lime, and the effect was most reasonable when the content of lime was 4%. It is thought that mixing cement can hardly improve the water stability of the mixture.
The results show that with the increase of temperature, the splitting strength of three kinds of asphalt mixtures (AC-13, AM-13, OGFC-13) decreases gradually, and the splitting strength and temperature show a good exponential phase. The correlation coefficient R2 ranged from 0.92 to 0.98.
_In the study of internal damage of asphalt mixture specimens after freeze-thaw splitting, CT image technology was used, and it was concluded that: during freeze-thaw process, water had a significant destructive effect on the bond between asphalt mortar and aggregate, and the voids increased obviously after splitting at the place with larger initial void ratio, and the voids of asphalt mixture specimens increased significantly. The location and direction of damage development are closely related to the initial void distribution, and the damage variable is used to quantitatively describe the water damage of asphalt mixture under the coupling action of water temperature and load.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414
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