【摘要】：我國的寒區(qū)和其它一些地區(qū)在秋冬季節(jié)由于溫度較低、晝夜溫差較大，道路經(jīng)常處于結(jié)冰與融化的反復(fù)中，造成瀝青路面不同程度的凍融破壞。目前專門針對瀝青混合料凍融破壞的研究并不多，SMA是一種性能優(yōu)良的瀝青混合料，近年來得到了廣泛的應(yīng)用。因此，，很有必要研究凍融循環(huán)對SMA性能的影響。 選擇原材料并進(jìn)行性能測試，設(shè)計SMA混合料的配合比、凍融循環(huán)的試驗條件、試驗方法。按照初始空隙率進(jìn)行分組，測定混合料凍融循環(huán)后的質(zhì)量損失率、空隙率、馬歇爾穩(wěn)定度、流值、馬歇爾模數(shù)、凍融劈裂抗拉強(qiáng)度、凍融劈裂抗拉強(qiáng)度比（TSR），并提出凍融殘留穩(wěn)定度、凍融殘留馬歇爾模數(shù)兩個新指標(biāo)。以凍融殘留穩(wěn)定度和TSR達(dá)到80%的凍融循環(huán)次數(shù)來評價SMA混合料凍融循環(huán)后的水穩(wěn)定性。試驗結(jié)果表明，初始空隙率對SMA凍融循環(huán)后的體積性能和水穩(wěn)定性的影響較大，消石灰和水泥可以顯著增強(qiáng)SMA凍融循環(huán)后的體積性能和水穩(wěn)定性，且消石灰的效果要好于水泥。 確定SMA車轍板的碾壓次數(shù)，成型車轍板，設(shè)計凍融循環(huán)的試驗條件、試驗方法。測定凍融循環(huán)后SMA車轍板的動穩(wěn)定度、相對變形率和總變形量，并提出凍融殘留動穩(wěn)定度這一新的評價指標(biāo)，以該指標(biāo)達(dá)到80%的凍融循環(huán)次數(shù)來評價SMA混合料凍融循環(huán)后的高溫穩(wěn)定性。測定SMA車轍板凍融循環(huán)后的滲水系數(shù)，進(jìn)一步探究凍融循環(huán)對SMA混合料空隙率的影響。試驗結(jié)果表明：凍融循環(huán)使SMA的高溫穩(wěn)定性降低，滲水系數(shù)增大；摻加水泥、消石灰可以顯著地改善SMA混合料凍融循環(huán)后的高溫穩(wěn)定性，且消石灰的效果要好于水泥；SMA車轍板的初始空隙率越大，凍融循環(huán)后的滲水系數(shù)也越大，但摻加消石灰的SMA車轍板雖然初始空隙率最大，凍融循環(huán)后的抗?jié)B水性能卻依然較好。 測定凍融循環(huán)后SMA馬歇爾試件的超聲波速，分析試件中的水對超聲波速的影響，提出了超聲波速修正時間公式。建立修正后的超聲波速與馬歇爾穩(wěn)定度、凍融劈裂抗拉強(qiáng)度的相關(guān)關(guān)系，提出了建議的擬合經(jīng)驗公式。試驗結(jié)果表明：經(jīng)過修正后的超聲波速與凍融循環(huán)后SMA混合料的馬歇爾穩(wěn)定度、劈裂抗拉強(qiáng)度有良好的相關(guān)性。
[Abstract]:In the cold region of our country and some other areas in autumn and winter, because of the low temperature and the large temperature difference between day and night, the road is often in the repeated freezing and melting, resulting in different degrees of freeze-thaw damage of asphalt pavement. At present, there are few researches on freeze-thaw failure of asphalt mixtures. SMA is a kind of asphalt mixture with excellent performance, which has been widely used in recent years. Therefore, it is necessary to study the effect of freeze-thaw cycle on the properties of SMA. The raw materials were selected and the performance test was carried out. The mix proportion of SMA mixture, the test conditions and test methods of freeze-thaw cycle were designed. According to the initial voidage, the mass loss rate, voidage, Marshall stability, flow value, Marshall modulus and freeze-thaw split tensile strength ratio (TSR), of the mixture after freeze-thaw cycle were measured. Two new indexes, freeze-thaw residual stability and freeze-thaw residual Marshall modulus, are put forward. The water stability of SMA mixture after freeze-thaw cycle was evaluated by freeze-thaw residual stability and the number of freeze-thaw cycles with TSR up to 80%. The experimental results show that the initial voidage has a great influence on the volume performance and water stability of SMA after freeze-thaw cycle. Lime and cement can significantly enhance the volume performance and water stability of SMA freeze-thaw cycle, and the effect of lime elimination is better than that of cement. Determine the rolling times of SMA frog board, form the frog board, design the test conditions and test methods of freeze-thaw cycle. The dynamic stability, relative deformation rate and total deformation of SMA frog plate after freeze-thaw cycle were measured, and a new evaluation index of freeze-thaw residual dynamic stability was put forward. The high temperature stability of SMA mixture after freeze-thaw cycle was evaluated by 80% freeze-thaw cycle times. The water permeability coefficient of SMA rut plate after freeze-thaw cycle was measured, and the effect of freeze-thaw cycle on voidage of SMA mixture was further investigated. The experimental results show that the high temperature stability of SMA is decreased and the water permeability coefficient is increased by freeze-thaw cycle, and the high temperature stability of SMA mixture after freeze-thaw cycle can be significantly improved by adding cement, and the effect of lime elimination is better than that of cement. The larger the initial voidage of SMA frog board is, the greater the seepage coefficient is after freeze-thaw cycle. However, although the initial voidage of SMA frog board with lime is the largest, the impermeability of SMA frog board after freeze-thaw cycle is still better. The ultrasonic wave velocity of SMA Marshall specimen after freeze-thaw cycle was measured, the influence of water in the specimen on ultrasonic wave velocity was analyzed, and the formula of ultrasonic velocity correction time was put forward. The relationship between the modified ultrasonic velocity and the stability of Marshal and the tensile strength of freeze-thaw split is established, and the suggested fitting empirical formula is put forward. The experimental results show that there is a good correlation between the modified ultrasonic wave velocity and the Marshall stability and split tensile strength of SMA mixture after freeze-thaw cycle.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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