發(fā)布時(shí)間：2018-04-11 18:12

  本文選題：應(yīng)力吸收層 + 乳化瀝青　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：在我國(guó)高等級(jí)公路建設(shè)中，主要采用半剛性基層加瀝青混凝土面層的復(fù)合結(jié)構(gòu)形式，該路面結(jié)構(gòu)在運(yùn)營(yíng)期間容易因裂縫而出現(xiàn)各種病害，在交通荷載和溫度荷載的作用下，半剛性基層裂縫向上擴(kuò)展是形成反射裂縫。反射裂縫成為半剛性基層瀝青面層最主要的破壞形式之一，選擇合理的層間連接技術(shù)是解決這一問(wèn)題的關(guān)鍵。在國(guó)外，纖維增強(qiáng)乳化瀝青碎石應(yīng)力吸收層作為半剛性基層與面層之間的應(yīng)力吸收層已經(jīng)得到了廣泛的應(yīng)用。 本文通過(guò)對(duì)應(yīng)力吸收層結(jié)構(gòu)、技術(shù)性能以及組成材料進(jìn)行分析，得出該應(yīng)力吸收層具有良好的應(yīng)力吸收和分散能力；較高的防水性能；良好的高溫穩(wěn)定性；并且施工方便快捷。在復(fù)合材料及斷裂力學(xué)理論的基礎(chǔ)上，對(duì)纖維瀝青碎石應(yīng)力吸收層的應(yīng)力強(qiáng)度因子及斷裂韌性進(jìn)行計(jì)算分析，探索纖維瀝青應(yīng)力吸收層在裂縫尖端應(yīng)力下的阻裂行為規(guī)律。 以貧水泥混凝土水泥板代替半剛性基層，制作鋪設(shè)纖維增強(qiáng)乳化瀝青應(yīng)力吸收層復(fù)合路面結(jié)構(gòu)試件，模擬路面反射裂縫擴(kuò)展形式。通過(guò)三點(diǎn)彎曲試驗(yàn)，測(cè)量模擬半剛性基層路面結(jié)構(gòu)的斷裂參數(shù)，以斷裂能作為評(píng)價(jià)路面結(jié)構(gòu)抗裂性能的指標(biāo)，分析纖維增強(qiáng)乳化瀝青應(yīng)力吸收層的抗裂性能。得出，在相同試驗(yàn)溫度下，纖維增強(qiáng)乳化瀝青碎石應(yīng)力吸收層復(fù)合路面的最大擾度大于改性乳化瀝青透層復(fù)合路面的最大擾度；纖維增強(qiáng)乳化瀝青碎石應(yīng)力吸收層復(fù)合路面的最大彎曲力大于改性乳化瀝青透層復(fù)合路面的最大彎曲力；纖維增強(qiáng)乳化瀝青碎石應(yīng)力吸收層復(fù)合路面的斷裂能大于改性乳化瀝青透層復(fù)合路面的斷裂能。 進(jìn)一步研究纖維增強(qiáng)乳化瀝青應(yīng)力吸收層復(fù)合路面結(jié)構(gòu)斷裂參數(shù)的溫度關(guān)聯(lián)性，選取25℃、20℃、15℃、10℃、5℃、0℃、-5℃、-10℃、-15℃、-20℃作為試驗(yàn)溫度。得出：纖維增強(qiáng)乳化瀝青碎石應(yīng)力吸收層復(fù)合路面結(jié)構(gòu)最大擾度值隨著溫度的降低逐漸減��；最大彎曲力隨著溫度的降低逐漸減�。粩嗔涯茈S著試驗(yàn)溫度的降低先增大再減小，當(dāng)溫度降低時(shí)，路面結(jié)構(gòu)由粘彈性逐漸變?yōu)闇?zhǔn)脆性，彎曲力出現(xiàn)突變，由斷裂能計(jì)算公式可知，斷裂能與力與擾度曲線圍成面積相關(guān)，，所以使得斷裂能的變化規(guī)律性降低。
[Abstract]:In the construction of high grade highway in our country, the composite structure of semi-rigid base course with asphalt concrete surface layer is mainly adopted. The pavement structure is prone to various diseases due to cracks during operation, under the action of traffic load and temperature load.The upward propagation of the semi-rigid base cracks is the formation of reflective cracks.Reflection crack has become one of the main failure forms of semi-rigid base asphalt surface layer. The key to solve this problem is to select reasonable interlayer connection technology.Fiber reinforced emulsified asphalt macadam stress absorption layer has been widely used as a stress absorption layer between semi-rigid base and surface layer.Through the analysis of the structure, technical properties and composition of the stress absorption layer, it is concluded that the stress absorption layer has good stress absorption and dispersion ability, high waterproof performance, good high temperature stability, and easy and fast construction.Based on the theory of composite material and fracture mechanics, the stress intensity factor and fracture toughness of the stress absorbing layer of fiber-asphalt macadam are calculated and analyzed, and the crack resistance behavior of the stress absorption layer of fiber asphalt under crack tip stress is explored.The semi-rigid base was replaced by lean cement concrete cement slab, and the composite pavement structure specimen with fiber reinforced emulsified asphalt stress absorption layer was made to simulate the propagation of reflective crack on the pavement.The fracture parameters of simulated semi-rigid base pavement structure were measured by three-point bending test. The crack resistance of fiber reinforced emulsified asphalt stress absorption layer was analyzed by taking fracture energy as an index to evaluate the crack resistance of pavement structure.At the same test temperature, the maximum disturbance of the composite pavement with fiber reinforced emulsified asphalt macadam stress absorption layer is greater than that of the modified emulsified asphalt permeable composite pavement.The maximum bending force of fiber reinforced emulsified asphalt macadam composite pavement is greater than that of modified emulsified asphalt composite pavement.The fracture energy of fiber reinforced emulsified asphalt macadam composite pavement is higher than that of modified emulsified asphalt composite pavement.The temperature dependence of structural fracture parameters of fiber reinforced emulsified asphalt composite pavement is further studied. 25 鈩

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