季凍區(qū)橡膠瀝青及混合料的路用性能研究
發(fā)布時(shí)間：2018-07-21 11:43
【摘要】：黑龍江省季凍區(qū)春、秋季節(jié)持續(xù)時(shí)間短,冬季漫長寒冷,夏季炎熱多雨。針對黑龍江省季凍區(qū)的氣候特點(diǎn),以針入度、軟化點(diǎn)、延度、彈性恢復(fù)及粘度為控制指標(biāo),研究橡膠瀝青各技術(shù)指標(biāo)隨拌合溫度、膠粉細(xì)度、膠粉摻量三因素的變化規(guī)律,以礦料間隙率、粗集料間隙率、瀝青飽和度等體積指標(biāo)為參考,對不同因素下的混合料進(jìn)行配合比設(shè)計(jì),得出級配、膠粉細(xì)度、膠粉摻量三因素對體積指標(biāo)的影響規(guī)律；然后將不同因素水平條件下的混合料路用性能進(jìn)行對比,分析研究了適用于黑龍江省季凍區(qū)的橡膠瀝青混合料影響因素水平范圍；基于季凍區(qū)晝夜溫差大的特點(diǎn),采用以24小時(shí)為一個(gè)凍融循環(huán)周期的凍融實(shí)驗(yàn),以拉伸應(yīng)變、劈裂強(qiáng)度及勁度模量為控制指標(biāo),研究不同空隙率、不同凍融次數(shù)條件下的橡膠瀝青混合料性能的衰減規(guī)律。研究結(jié)果如下：1、橡膠瀝青性能隨拌合溫度的升高呈拋物線式變化,溫度偏高,橡膠瀝青的彈性恢復(fù)較差,膠粉與瀝青的反應(yīng)過程存在最佳溫度；膠粉粒徑大,橡膠瀝青低溫抗拉性能差,隨粒徑的減小,橡膠改性瀝青性能逐漸提高,但性能提高幅度逐漸減��；膠粉摻量高的橡膠瀝青彈性恢復(fù)率降低,黏度較大,導(dǎo)致混合料壓實(shí)困難,摻量低性能改善效果較差。2、采用了5種依次由粗到細(xì)的間斷級配,結(jié)果發(fā)現(xiàn)隨細(xì)集料的增加混合料粗集料間隙逐漸增大,為使粗集料形成嵌擠的骨架結(jié)構(gòu),SMA-10橡膠瀝青混合料關(guān)鍵篩孔(2.36mm)通過率存在最高限值,但粗級配的礦料間隙率偏大,相應(yīng)的瀝青用量偏高。隨膠粉粒徑及膠粉摻量的增大,混合料的瀝青用量也增大,膠粉粒徑對混合料油石比的變化影響較小,混合料的油石比極差為較小。3、橡膠瀝青混合料的路用性能隨油石比、膠粉細(xì)度、膠粉摻量的增加而提高,但隨著膠粉摻量的增加,混合料的高溫性能與低溫性能存在拐點(diǎn),超出拐點(diǎn)后性能反而下降；隨著細(xì)集料的增加,混合料的高溫性能降低,低溫性能與水穩(wěn)性能提高。橡膠瀝青混合料的路用性能較基質(zhì)瀝青混合料有較大提高,動穩(wěn)定度比基質(zhì)瀝青混合料高出2倍左右。4、對于凍融實(shí)驗(yàn),研究發(fā)現(xiàn)：隨凍融次數(shù)的增加混合料試件的空隙率增大,劈裂強(qiáng)度逐漸減��；隨著空隙率的增大混合料性能衰減速率加快,強(qiáng)度衰減幅度可高達(dá)50%,針對季凍區(qū),為預(yù)防凍融產(chǎn)生的病害,應(yīng)避免混合料的現(xiàn)場空隙率落入凍融損壞區(qū)。
[Abstract]:In the seasonal frozen area of Heilongjiang Province, the autumn season lasts for a short time, the winter is long and cold, and the summer is hot and rainy. In view of the climatic characteristics of seasonal freezing area in Heilongjiang Province, taking penetration, softening point, ductility, elastic recovery and viscosity as control indexes, the variation law of each technical index of rubber asphalt with mixing temperature, fineness of rubber powder and content of rubber powder was studied. Based on the volume index of mineral aggregate, coarse aggregate, asphalt saturation and so on, the proportion of mixture under different factors is designed, and the influence law of gradation, fineness of rubber powder and content of rubber powder on volume index is obtained. Then the road performance of the mixture under different factor levels is compared, and the influence factor range of rubber asphalt mixture suitable for seasonal freezing area in Heilongjiang Province is analyzed and studied, which is based on the characteristics of large diurnal temperature difference in seasonal freezing area. Taking 24 hours as a freeze-thaw cycle experiment and taking tensile strain, splitting strength and stiffness modulus as control indexes, the attenuation law of rubber asphalt mixture performance under different voids and different freeze-thaw times was studied. The results are as follows: 1. The performance of rubber asphalt varies parabola with the increase of mixing temperature, the temperature is high, the elastic recovery of rubber asphalt is poor, the reaction process between rubber powder and asphalt has the best temperature, the particle size of rubber powder is large, The low temperature tensile resistance of rubber asphalt is poor, and with the decrease of particle size, the performance of rubber modified asphalt is gradually improved, but the range of performance improvement is gradually reduced, the elastic recovery rate of rubber asphalt with high content of rubber powder is reduced, and the viscosity of rubber asphalt decreases, which leads to the difficulty of compaction of the mixture. The improvement effect of low content and low performance is poor. 2. Five discontinuous gradation from coarse to fine are adopted. The results show that the gap of coarse aggregate increases with the increase of fine aggregate. In order to make coarse aggregate form an embedded skeleton structure, the pass rate of critical sieve hole (2.36mm) of rubber asphalt mixture (SMA-10) has the highest limit value, but the clearance ratio of coarse gradation mineral aggregate is too large, and the corresponding asphalt content is on the high side. With the increase of rubber particle size and rubber powder content, the asphalt content of the mixture also increases. The rubber particle size has little effect on the change of the asphalt ratio of the mixture. The difference of the asphalt ratio of the mixture is smaller than that of the asphalt mixture, and the road performance of the rubber asphalt mixture varies with the asphalt ratio. The fineness of rubber powder and the content of rubber powder increase, but with the increase of the content of rubber powder, the high temperature and low temperature properties of the mixture have inflection point, and the performance of the mixture decreases after it exceeds the inflection point, and with the increase of fine aggregate, the high temperature performance of the mixture decreases. Low temperature performance and water stability are improved. The pavement performance of rubber asphalt mixture is greatly improved than that of base asphalt mixture, and the dynamic stability of rubber asphalt mixture is about 2 times higher than that of base asphalt mixture. For the freeze-thaw experiment, it is found that with the increase of freeze-thaw times, the void ratio of the mixture specimen increases. The splitting strength decreases gradually with the increase of void ratio, and the attenuation range of strength can be as high as 50%. In order to prevent the disease caused by freezing and thawing, the in-situ void rate of mixture should be avoided from falling into freeze-thaw damage zone.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414
本文編號：2135413
[Abstract]:In the seasonal frozen area of Heilongjiang Province, the autumn season lasts for a short time, the winter is long and cold, and the summer is hot and rainy. In view of the climatic characteristics of seasonal freezing area in Heilongjiang Province, taking penetration, softening point, ductility, elastic recovery and viscosity as control indexes, the variation law of each technical index of rubber asphalt with mixing temperature, fineness of rubber powder and content of rubber powder was studied. Based on the volume index of mineral aggregate, coarse aggregate, asphalt saturation and so on, the proportion of mixture under different factors is designed, and the influence law of gradation, fineness of rubber powder and content of rubber powder on volume index is obtained. Then the road performance of the mixture under different factor levels is compared, and the influence factor range of rubber asphalt mixture suitable for seasonal freezing area in Heilongjiang Province is analyzed and studied, which is based on the characteristics of large diurnal temperature difference in seasonal freezing area. Taking 24 hours as a freeze-thaw cycle experiment and taking tensile strain, splitting strength and stiffness modulus as control indexes, the attenuation law of rubber asphalt mixture performance under different voids and different freeze-thaw times was studied. The results are as follows: 1. The performance of rubber asphalt varies parabola with the increase of mixing temperature, the temperature is high, the elastic recovery of rubber asphalt is poor, the reaction process between rubber powder and asphalt has the best temperature, the particle size of rubber powder is large, The low temperature tensile resistance of rubber asphalt is poor, and with the decrease of particle size, the performance of rubber modified asphalt is gradually improved, but the range of performance improvement is gradually reduced, the elastic recovery rate of rubber asphalt with high content of rubber powder is reduced, and the viscosity of rubber asphalt decreases, which leads to the difficulty of compaction of the mixture. The improvement effect of low content and low performance is poor. 2. Five discontinuous gradation from coarse to fine are adopted. The results show that the gap of coarse aggregate increases with the increase of fine aggregate. In order to make coarse aggregate form an embedded skeleton structure, the pass rate of critical sieve hole (2.36mm) of rubber asphalt mixture (SMA-10) has the highest limit value, but the clearance ratio of coarse gradation mineral aggregate is too large, and the corresponding asphalt content is on the high side. With the increase of rubber particle size and rubber powder content, the asphalt content of the mixture also increases. The rubber particle size has little effect on the change of the asphalt ratio of the mixture. The difference of the asphalt ratio of the mixture is smaller than that of the asphalt mixture, and the road performance of the rubber asphalt mixture varies with the asphalt ratio. The fineness of rubber powder and the content of rubber powder increase, but with the increase of the content of rubber powder, the high temperature and low temperature properties of the mixture have inflection point, and the performance of the mixture decreases after it exceeds the inflection point, and with the increase of fine aggregate, the high temperature performance of the mixture decreases. Low temperature performance and water stability are improved. The pavement performance of rubber asphalt mixture is greatly improved than that of base asphalt mixture, and the dynamic stability of rubber asphalt mixture is about 2 times higher than that of base asphalt mixture. For the freeze-thaw experiment, it is found that with the increase of freeze-thaw times, the void ratio of the mixture specimen increases. The splitting strength decreases gradually with the increase of void ratio, and the attenuation range of strength can be as high as 50%. In order to prevent the disease caused by freezing and thawing, the in-situ void rate of mixture should be avoided from falling into freeze-thaw damage zone.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414
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