半柔性路面材料的体积稳定性与抗裂性能研究
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摘要
半柔性路面材料是一种由沥青混凝土与水泥基灌浆材料复合组成的具有高抗车辙性、高耐磨性、高抗剪切、高水稳定性、行车舒适性等特点的新型路面材料,非常适用于路口转弯、加油站、停车场、公交车站、机场跑道等路段,具有十分广阔的应用前景。然而目前半柔性路面材料普遍存在开裂问题,影响其大规模的推广应用。因此,研究半柔性路面的体积稳定性与抗裂性能具有重要意义。
本文依托湖北省交通厅项目“湖北省武英高速公路高耐久多功能沥青面层结构与材料设计”,针对国内外半柔性路面材料中存在水泥基灌浆材料与沥青混合料的力学性能匹配性差、温感性差异大、表界面粘结性能差的技术问题,从高连通孔隙沥青混合料与水泥基灌浆材料进行了设计研究。
提出了高连通孔、高粘、高韧沥青混合料设计方法,采用高粘度改性沥青、玄武岩、石灰石矿粉,开发出了高连通空隙率、高水稳性、高抗车辙沥青混合料PFC-13：其矿料控制筛孔为4.75mm,其通过率为10-25%,混合料孔隙率在25-30%,连通空隙率达22-28%。
研究了沥青-水泥基灌浆材料界面增粘改性机理,利用橡胶粉、乳化沥青、聚羧酸高效减水剂开发出了可灌性能高、低收缩的聚合物改性水泥基灌浆料：流动度损失小于20%,离析率分小于2.5%,体积泌水率小于3%,28d干缩小于0.3%,弹性模量低于15324MPa,与沥青粘附性大于4级,能有效解决水泥胶浆易离析、流动度损失快、与沥青混合料弹性模量不匹配、粘结性能差的技术难题。
研究了沥青、集料、水泥基灌浆材料对半柔性路面材料体积稳定性、抗裂性能影响规律,制备出了高体积稳定性、高抗裂性的半柔性路面材料：热膨胀系数小于3.4×10-5／℃,抗压回弹模量为2933-3600Mpa,抗剪强度大于5.74Mpa,疲劳寿命大于12000次(应力比为0.4)。与国内外半柔性路面材料、SMA、AC等路面材料相比,采用本技术开发出的半柔性路面材料结构性能与功能性能优异,工程造价低,施工方便,能很好解决半柔性路面开裂的技术难题,能显著提高路面使用寿命,具有显著地经济效益与社会价值。
Semi-flexible pavement material is a new kind of composite pavement material, which is consist of asphalt concrete and cement grout. It has some features:high carrying capacity, high wearing resistance, high shear, high water stability and driving comfortable ability. Semi-flexible pavement material has very bright application prospects and it is suitable to use at intersection turner, gas station, parking, bus station, airport runways and other sections. However, the wild application of this material was impeded by the cracking problems. Therefore, it has an great significance to study the volume stability and the crack resistance of semi-flexible pavement.
Relying on Hubei Provincial Communications Department project:" The durable multi-surface structure and material design of Wuying Highway of Hubei Province ", this article investigated and designed the matrix asphalt mixture and cement-based grout materials. It aimed at resolving the problem, which presents in the domestic and international technologies, the poor match of mechanical properties between cement-based grouting materials and asphalt mixtures, large differences in temperature sensitivity, poor interface bonding performance.
The article proposed the merthod of material design, with high connectivity hole, high viscosity, and high thoughness of asphalt concrete. Using high viscosity modified asphalt and grading design optimization method, it also developed a high viscosity and high pore connectivity tough mixture PFC-13, which features are the sieve of mineral aggregate 4.75mm, pass rate of 10-25%, porosity of mixture 25-30%, the connectivity porosity up to 22-28%.
The article investigated the interface compatibilizing modification mechanism of the asphalt and cement-based grout material. Using rubber powder, emulsified asphalt and polycarboxylate, it developed a highly flexible high-flow and high volume stability of cement paste:fluidity loss of less than 20%, segregation rate less than 2.5% points, the bleeding volume less than 3%, respectively,28d less than 0.3% shrinkage, elastic modulus less than 15324MPa, and asphalt adhesion greater than 4. The technology can easily solve the problem of the traditional segregation of cement paste, high elastic modulus, rapid loss of fluidity, and poor bonding properties of asphalt
The article studied the influence law of different asphalt, aggregate and cement based grouting materials on the volume stability, mechanical properties and crack resistance of emi-flexible pavement materials. We prepared high dimensional stability, high crack resistance of semi-flexible pavement material:thermal expansion coefficient to 3.4×10-5/℃, thermal shrinkage coefficient less than 1.2×10-5/℃, compressive strength greater than 7.6Mpa, compressive modulus for 2933 3600Mpa, shear strength greater than 5.74 Mpa, fatigue 12,000 times larger than life (stress ratio of 0.4). Compared with other semi-flexible pavement material at home and abroad, SMA, AC and other pavement materials, the development of this semi-flexible pavement has better performance, for example, low cost and easy construction, easy to solve the cracking technical difficulties, improving the road service life significantly and being of great prospects and values.
本文依托湖北省交通厅项目“湖北省武英高速公路高耐久多功能沥青面层结构与材料设计”,针对国内外半柔性路面材料中存在水泥基灌浆材料与沥青混合料的力学性能匹配性差、温感性差异大、表界面粘结性能差的技术问题,从高连通孔隙沥青混合料与水泥基灌浆材料进行了设计研究。
提出了高连通孔、高粘、高韧沥青混合料设计方法,采用高粘度改性沥青、玄武岩、石灰石矿粉,开发出了高连通空隙率、高水稳性、高抗车辙沥青混合料PFC-13：其矿料控制筛孔为4.75mm,其通过率为10-25%,混合料孔隙率在25-30%,连通空隙率达22-28%。
研究了沥青-水泥基灌浆材料界面增粘改性机理,利用橡胶粉、乳化沥青、聚羧酸高效减水剂开发出了可灌性能高、低收缩的聚合物改性水泥基灌浆料：流动度损失小于20%,离析率分小于2.5%,体积泌水率小于3%,28d干缩小于0.3%,弹性模量低于15324MPa,与沥青粘附性大于4级,能有效解决水泥胶浆易离析、流动度损失快、与沥青混合料弹性模量不匹配、粘结性能差的技术难题。
研究了沥青、集料、水泥基灌浆材料对半柔性路面材料体积稳定性、抗裂性能影响规律,制备出了高体积稳定性、高抗裂性的半柔性路面材料：热膨胀系数小于3.4×10-5／℃,抗压回弹模量为2933-3600Mpa,抗剪强度大于5.74Mpa,疲劳寿命大于12000次(应力比为0.4)。与国内外半柔性路面材料、SMA、AC等路面材料相比,采用本技术开发出的半柔性路面材料结构性能与功能性能优异,工程造价低,施工方便,能很好解决半柔性路面开裂的技术难题,能显著提高路面使用寿命,具有显著地经济效益与社会价值。
Semi-flexible pavement material is a new kind of composite pavement material, which is consist of asphalt concrete and cement grout. It has some features:high carrying capacity, high wearing resistance, high shear, high water stability and driving comfortable ability. Semi-flexible pavement material has very bright application prospects and it is suitable to use at intersection turner, gas station, parking, bus station, airport runways and other sections. However, the wild application of this material was impeded by the cracking problems. Therefore, it has an great significance to study the volume stability and the crack resistance of semi-flexible pavement.
Relying on Hubei Provincial Communications Department project:" The durable multi-surface structure and material design of Wuying Highway of Hubei Province ", this article investigated and designed the matrix asphalt mixture and cement-based grout materials. It aimed at resolving the problem, which presents in the domestic and international technologies, the poor match of mechanical properties between cement-based grouting materials and asphalt mixtures, large differences in temperature sensitivity, poor interface bonding performance.
The article proposed the merthod of material design, with high connectivity hole, high viscosity, and high thoughness of asphalt concrete. Using high viscosity modified asphalt and grading design optimization method, it also developed a high viscosity and high pore connectivity tough mixture PFC-13, which features are the sieve of mineral aggregate 4.75mm, pass rate of 10-25%, porosity of mixture 25-30%, the connectivity porosity up to 22-28%.
The article investigated the interface compatibilizing modification mechanism of the asphalt and cement-based grout material. Using rubber powder, emulsified asphalt and polycarboxylate, it developed a highly flexible high-flow and high volume stability of cement paste:fluidity loss of less than 20%, segregation rate less than 2.5% points, the bleeding volume less than 3%, respectively,28d less than 0.3% shrinkage, elastic modulus less than 15324MPa, and asphalt adhesion greater than 4. The technology can easily solve the problem of the traditional segregation of cement paste, high elastic modulus, rapid loss of fluidity, and poor bonding properties of asphalt
The article studied the influence law of different asphalt, aggregate and cement based grouting materials on the volume stability, mechanical properties and crack resistance of emi-flexible pavement materials. We prepared high dimensional stability, high crack resistance of semi-flexible pavement material:thermal expansion coefficient to 3.4×10-5/℃, thermal shrinkage coefficient less than 1.2×10-5/℃, compressive strength greater than 7.6Mpa, compressive modulus for 2933 3600Mpa, shear strength greater than 5.74 Mpa, fatigue 12,000 times larger than life (stress ratio of 0.4). Compared with other semi-flexible pavement material at home and abroad, SMA, AC and other pavement materials, the development of this semi-flexible pavement has better performance, for example, low cost and easy construction, easy to solve the cracking technical difficulties, improving the road service life significantly and being of great prospects and values.
引文
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[4]徐培华,汪增凯,李培坤.灌注式半刚性路面材料室内试验研究[J].西安公路交通大学学报,1995,9(4)：22-25.
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[8]谭积青,张肖宁,张太平.半柔性铺装技术浅析[J].广东公路交通,2000,(2)：7-9.
[9]K.E. Hassan, A. Setyawan, S.E. Zoorob2002. Effect of cementitious grouts on the properties of semi-flexible bituminous pavements[C].Performance of Bituminous and Hydraulic Materials in Pavements, Nottingham,2002.
[10]Densit A/S. Densiphalt Reference List-Airports[M].2000.
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[12]Eckrose/Green Associates Inc. Pavement Condition Survey and Evaluation for Logan International Airport [J], March 2001.
[13]吴国雄,梅迎军,李力.半柔性复合路面设计与施工[M].北京：人民交通出版社,2009.
[14]吕豹译.法国新型路面标准结构手册[M].北京：人民交通出版社,1987：45-98.
[15]Ai-Qadi I L, Gouru H, Weyers R E. Asphalt Portland cement concrete composite:laboratory evaluation.ASCE,1994,120(1):94-108.
[16]Huddleston I J, Zhou H, Hicks R G.Evaluation of open-graded asphalt concrete mixtures used in Oregon[C].Transportation Research Record 1427TRB National Research Council, Washington D C,1993:5-12.
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