本文關(guān)鍵詞：MA類瀝青混合料疲勞性能評價方法研究　出處：《華南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： MA類瀝青混合料 疲勞壽命 累積耗散能 沖擊韌性 評價方法 壽命預(yù)測

【摘要】：傳統(tǒng)的方法在實際評價MA(Mastic Asphalt，瀝青瑪蹄脂)類瀝青混合料的疲勞性能時，，由于其時間長，在實際過程中并不現(xiàn)實。目前常使用沖擊韌性法來評價普通瀝青混合料的疲勞性能，該方法能否適用于MA類瀝青混合料目前還未知。瀝青路面承受車輛荷載的重復(fù)作用，作用時間短、作用力大，符合沖擊荷載的特征，而且沖擊韌性是一個能量的概念，不受荷載模式的影響，所以采用沖擊韌性評價MA類瀝青路面抵抗疲勞開裂的能力在理論上是可行的。 本文研究是建立在港珠澳大橋橋面鋪裝研究階段，因此試驗研究采用的A-70瀝青材料、特立尼達湖瀝青（TLA），以及集料和礦粉等。實驗所需試件取自試驗路段，在實驗室用雙面切割機分別成型四點疲勞實驗小梁和沖擊韌性小梁。使用Cooper疲勞試驗機進行四點疲勞試驗，在5個應(yīng)變水平（300με、600με、700με、800με、900με）下，得出疲勞試驗數(shù)據(jù)結(jié)果，并分析得出了MA/GMA(Guss Mastic Asphalt)兩種不同工藝下的MA類混合料疲勞壽命預(yù)測方程。 本文采用MTS試驗機對MA類瀝青混合料小梁試件進行沖擊韌性試驗，計算得出其沖擊韌性值，結(jié)果表明： MA類瀝青混合料施工工藝（MA和GMA）不同，其沖擊韌性值也相差較大，即混合料的疲勞性能也不相同；拌和時間是影響MA類瀝青混合料沖擊韌性的重要因素，溫度也會影響沖擊韌性，但其影響程度小于拌和時間；同種工藝下，配合比不同，混合料沖擊韌性值也不同。 本文驗證了小梁試件沖擊韌性與四點疲勞試驗疲勞壽命、總耗散能的相關(guān)性，并分別建立了二者之間的數(shù)學(xué)關(guān)系。得出相關(guān)結(jié)論，具體如下：1）兩種不同工藝的MA類瀝青混合料不同配合比的沖擊韌性與疲勞壽命進行相關(guān)性分析，兩者呈線性相關(guān)，其相關(guān)性良好，在工程過程中可以用沖擊韌性試驗來估計其疲勞壽命。老化程度不同，兩者線性關(guān)系依然良好。2）兩種不同工藝的MA類瀝青混合料不同配合比的沖擊韌性與累積耗散能進行相關(guān)性分析，兩者呈線性相關(guān)，其相關(guān)性良好，在工程過程中可以用沖擊韌性試驗來估計其累積耗散能。老化程度不同，兩者線性關(guān)系依然良好。3）瀝青混合料沖擊韌性與疲勞壽命和累積耗散能均呈線性相關(guān)，且其相關(guān)性都較好，但是又有所其別：在同一老化程度，改變配合比，累積耗散能優(yōu)于疲勞壽命；在相同的配合比，老化程度不同時候，相關(guān)性疲勞壽命優(yōu)于累積耗散能。 最后，沖擊韌性試驗是一種簡單、快捷的評價MA類瀝青混合料疲勞性能的試驗方法，沖擊韌性與四點疲勞各疲勞具有良好的相關(guān)性�？梢允褂脹_擊韌性來快速評價MA類瀝青混合料的疲勞性能。
[Abstract]:The traditional method is used to evaluate the fatigue performance of MA(Mastic Asphalt asphalt mixture because of its long time. The impact toughness method is often used to evaluate the fatigue performance of common asphalt mixture. Whether this method can be applied to MA asphalt mixture is still unknown. Asphalt pavement bears the repeated action of vehicle load, the action time is short, the action force is large, accord with the characteristic of impact load. The impact toughness is an energy concept and is not affected by the load mode, so it is theoretically feasible to use impact toughness to evaluate the ability of MA asphalt pavement to resist fatigue cracking. This study is based on the bridge deck pavement research stage of Hong Kong-Zhuhai-Macao Bridge, so the A-70 asphalt material, TLA-Trinidad Lake Asphalt, is used in the experimental study. As well as aggregate and mineral powder, etc. The test samples are taken from the test section. The four-point fatigue test trabeculae and the impact toughness trabeculae were formed by double-sided cutting machine in laboratory. The four-point fatigue tests were carried out by using Cooper fatigue testing machine, and 300 渭 蔚 at 5 strain levels. The fatigue test data were obtained under 600 渭 蔚 -700 渭 蔚 -800 渭 蔚 -900 渭 蔚. The prediction equation of fatigue life of MA mixture under two different processes of MA/GMA(Guss Mastic Asphalt is obtained. In this paper, MTS testing machine is used to test the impact toughness of MA type asphalt mixture trabeculae, and its impact toughness is calculated. The results show that the impact toughness of MA asphalt mixture is different from that of GMA, that is, the fatigue performance of the mixture is different. Mixing time is an important factor affecting impact toughness of MA type asphalt mixture, and temperature will also affect impact toughness, but its influence degree is smaller than mixing time. Under the same technology, mix ratio is different, mixture impact toughness value is also different. This paper verifies the correlation between the impact toughness of trabecular beams and fatigue life and total dissipation energy of four-point fatigue test, and establishes the mathematical relationship between them, and draws the relevant conclusions. Concrete as follows: 1) the impact toughness and fatigue life of two kinds of MA asphalt mixture with different mix ratio are analyzed. The relationship between them is linear, and the correlation is good. The fatigue life can be estimated by impact toughness test in engineering process. The linear relationship between the two is still good. 2) the impact toughness and cumulative dissipation energy of two kinds of MA asphalt mixture with different mix ratio are analyzed, and the correlation between them is linear, and the correlation is good. The cumulative dissipation energy can be estimated by impact toughness test in engineering process. The linear relationship between the two is still good. 3) the impact toughness of asphalt mixture is linearly correlated with fatigue life and cumulative dissipation energy, and the correlation is good, but there are some differences: in the same aging degree. The cumulative dissipation energy is better than the fatigue life when the mix ratio is changed. At the same mix ratio, the correlation fatigue life is better than the cumulative dissipation energy when the aging degree is different. Finally, the impact toughness test is a simple and fast test method to evaluate the fatigue performance of MA asphalt mixture. The impact toughness can be used to evaluate the fatigue performance of MA asphalt mixture quickly.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414;U444

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