砂粒式改性沥青混合料的性能与应用研究
发布时间：2019-06-16 15:34
【摘要】：课题组结合国内外研究现状,通过使用砂粒式改性沥青混合料来防治半刚性基层路面反射裂缝。在沥青路面矿质石料选取上,国内道路工作者大多选用玄武岩等分布不均、价格越来越昂贵且储量有限的石料应用于工程实际,课题组考虑到工程造价和将来技术推广少受地域限制,决定选用价格低廉、易于获得且现有储量大的石灰岩经料场加工打碎制得3-6粗集料、0-3细集料和矿粉作为本项目的矿质石料用于研究,且通过室内试验得到的三档集料各筛孔粒径质量通过百分率和主要技术性能指标的结果表明石灰岩集料完全能够用于砂粒式改性沥青混合料用来防治半刚性基层路面反射裂缝。在改性沥青的选用上,课题组考虑到半刚性基层路面防治反射裂缝并没有旧水泥路面加铺应力吸收层对改性沥青要求高这一工程实际,自行制备了在90#石油基质沥青中外掺20%的60目轮胎胶粉的胶粉改性沥青,并对90#石油沥青、胶粉改性沥青和新加坡埃索SBS成品改性沥青的三大指标等沥青主要技术性质进行了测定,结果表明胶粉改性沥青和新加坡埃索SBS成品改性沥青的技术性质都能满足砂粒式改性沥青混合料防治半刚性基层路面反射裂缝对改性沥青的要求,但考虑到胶粉改性沥青掺入轮胎胶粉较多,技术性质却跟SBS成品改性沥青相差无几,且生产胶粉改性沥青还需投入资金进行生产设备建设,课题组最终选用工程中易于得到、价格相对便宜且技术性质较高的新加坡埃索SBS成品改性沥青作为砂粒式改性沥青混合料的沥青原材料。随后课题组对砂粒式改性沥青混合料进行了配合比设计,通过分析国内外现行沥青混合料配合比设计方法结合砂粒式改性沥青混合料矿质石料细、矿粉占重大(2%-6%)、空隙率低(1%-2.5%)和油石比大(9.0%左右)的实际特点,本着在混合料空隙率满足要求的条件下使矿质集料的合成级配曲线尽可能离最大密度曲线远来确定各档集料的配合用量。最佳沥青用量的确定时,课题组采用现行使用广泛且相关经验较多的马歇尔试验配合比设计方法来确定,而对混合料的最大理论相对密度使用规范推荐的计算公式进行计算。最终确定集料配合成分为3-6：0-3：矿粉为28：69：3,最佳油石比为9.2%。在对砂粒式改性沥青混合料进行配合比设计确定矿料级配组成和最佳沥青用量后,课题组又对砂粒式改性沥青混合料的各项路用性能进行了试验分析并修筑了试验路用于长期观测防治反射裂缝的效果。
[Abstract]:Combined with the research status at home and abroad, the research group uses sand modified asphalt mixture to prevent and control reflection cracks of semi-rigid base pavement. In the selection of mineral stone materials for asphalt pavement, most of the domestic road workers choose basalt and so on, and the stone materials with more and more expensive and limited reserves are used in engineering practice. Considering that the cost of the project and the promotion of technology in the future are less limited by the region, the research group decided to choose the limestone with low price, easy to obtain and the existing reserves are processed and crushed to produce 3 / 6 coarse aggregate. 0 / 3 fine aggregate and mineral powder are used as mineral stone materials of this project, and the results of particle size quality passing percentage and main technical performance index of each screen hole of the third grade aggregate obtained by laboratory test show that limestone aggregate can be used in sand modified asphalt mixture to prevent reflection crack of semi-rigid base pavement. In the selection of modified asphalt, considering that the prevention and control of reflective cracks on semi-rigid base pavement does not require high requirements for modified asphalt by adding stress absorption layer to the old cement pavement, the modified asphalt with 60 mesh tire rubber powder mixed with 20% tire rubber powder in 90 # petroleum matrix asphalt has been prepared by itself, and the 90 # petroleum asphalt has been prepared by itself, and the modified asphalt with 60 mesh tire rubber powder at home and abroad has been prepared by the research group, taking into account that there is no high requirement for modified asphalt by adding stress absorption layer to the old cement pavement. The main technical properties of modified asphalt such as rubber powder modified asphalt and Singapore Esso SBS finished product modified asphalt were determined. the results show that the technical properties of rubber powder modified asphalt and Singapore Esso SBS finished product modified asphalt can meet the requirements of sand modified asphalt mixture for preventing reflective cracks in semi-rigid base pavement, but considering that there are more rubber powder modified asphalt mixed with tire rubber powder. However, the technical properties are similar to those of SBS modified asphalt, and the production of rubber powder modified asphalt still needs to be invested in the construction of production equipment. Finally, the research group selected Singapore Esso SBS finished modified asphalt, which is easy to be obtained in the project, which is relatively cheap and has high technical properties, as the asphalt raw material of sand modified asphalt mixture. Then the research group carried on the mix proportion design to the sand modified asphalt mixture, through analyzing the actual characteristics of the domestic and foreign current asphalt mixture mix proportion design method combined with the sand grain modified asphalt mixture mineral stone material fine, the mineral powder accounts for the important (2% 鈮，
本文编号：2500639
[Abstract]:Combined with the research status at home and abroad, the research group uses sand modified asphalt mixture to prevent and control reflection cracks of semi-rigid base pavement. In the selection of mineral stone materials for asphalt pavement, most of the domestic road workers choose basalt and so on, and the stone materials with more and more expensive and limited reserves are used in engineering practice. Considering that the cost of the project and the promotion of technology in the future are less limited by the region, the research group decided to choose the limestone with low price, easy to obtain and the existing reserves are processed and crushed to produce 3 / 6 coarse aggregate. 0 / 3 fine aggregate and mineral powder are used as mineral stone materials of this project, and the results of particle size quality passing percentage and main technical performance index of each screen hole of the third grade aggregate obtained by laboratory test show that limestone aggregate can be used in sand modified asphalt mixture to prevent reflection crack of semi-rigid base pavement. In the selection of modified asphalt, considering that the prevention and control of reflective cracks on semi-rigid base pavement does not require high requirements for modified asphalt by adding stress absorption layer to the old cement pavement, the modified asphalt with 60 mesh tire rubber powder mixed with 20% tire rubber powder in 90 # petroleum matrix asphalt has been prepared by itself, and the 90 # petroleum asphalt has been prepared by itself, and the modified asphalt with 60 mesh tire rubber powder at home and abroad has been prepared by the research group, taking into account that there is no high requirement for modified asphalt by adding stress absorption layer to the old cement pavement. The main technical properties of modified asphalt such as rubber powder modified asphalt and Singapore Esso SBS finished product modified asphalt were determined. the results show that the technical properties of rubber powder modified asphalt and Singapore Esso SBS finished product modified asphalt can meet the requirements of sand modified asphalt mixture for preventing reflective cracks in semi-rigid base pavement, but considering that there are more rubber powder modified asphalt mixed with tire rubber powder. However, the technical properties are similar to those of SBS modified asphalt, and the production of rubber powder modified asphalt still needs to be invested in the construction of production equipment. Finally, the research group selected Singapore Esso SBS finished modified asphalt, which is easy to be obtained in the project, which is relatively cheap and has high technical properties, as the asphalt raw material of sand modified asphalt mixture. Then the research group carried on the mix proportion design to the sand modified asphalt mixture, through analyzing the actual characteristics of the domestic and foreign current asphalt mixture mix proportion design method combined with the sand grain modified asphalt mixture mineral stone material fine, the mineral powder accounts for the important (2% 鈮，
本文编号：2500639
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