乳化沥青粘附性对稀浆封层质量的影响

简要分析了乳化沥青与石料粘附性的重要性,认为碱性石料比酸性石料与乳化沥青有更好的粘附性,针对福建花岗岩石料（酸性石料）偏多,提出了生产乳化沥青调酸、施工加碱等提高乳化沥青粘附性的几个措施。     

基于接触角法的沥青—石料粘附性评价

针对目前沥青路面突出的水损害现象,研究选取常用的三种沥青与四种石料,基于接触角法测定了沥青-石料之间的接触角,计算了沥青-石料的粘附功,建立了一种沥青—石料粘附性评价方法。结果表明:粘度大的沥青抵抗水的置换要比粘性小的沥青好。对于同种沥青而言,四种石料的粘附功大小依次为:石灰岩蛇纹岩玄武岩花岗岩,而对于同种石料而言,三种沥青的粘附功大小依次为克拉玛依90#SK90#≥中海油90#;能够通过接触角法所得粘附功定量评价沥青-石料粘附性,从而判断沥青混合料的水稳定性。     

典型石料与沥青粘附性的新型评价方法

通过对甘肃省5种典型石料进行成分分析,在常规水煮法进行粘附性研究的基础上,对石料-沥青接触角及其石料碱值进行试验研究,提出了石料与沥青粘附性的定量评价方法。另外分析接触角与水损害性能的相关性,结果表明:接触角越小,沥青与石料的粘附性越好,混合料的水稳定性也相应越高。     

信息与文摘

吉林省石油化工研究设计院研制成功一种新型沥青抗剥落剂ASA—9304.它属于表面活性物质,与沥青易于混溶,能增加沥青中的活性基团,从而提高了沥青与酸性石料的粘附力,使沥青牢固地粘附在酸性石料上.该剂生产工艺简单,设备无特殊要求,易于工业化生产.     

ANT型沥青抗剥落剂

一种新型的沥青改性剂——ANT型沥青抗剥落剂最近在我国研制成功。该产品可在道路施工时，按一定比例加入沥青中，从而大大提高了沥青的抗老化性、防水性和抗剥落性，使高等级公路沥青面使用强度高和耐磨性好。解决了沥青酸性石料粘附性差的难题，可使酸性石料在公路修建中得以广泛应用，使道路的使用寿命更长。ANT型沥青抗剥落剂@黄爱群     

新型酸性石料用纳米沥青抗剥落剂的制备与表征

本文针对酸性石料与沥青的界面粘结性差,易发生水损害等病害,应用原位聚合一步反应法制备了OMMT/聚酰胺纳米复合材料(新型纳米沥青抗剥落剂,简称为MAS),其带有的酰胺基团可有效提升沥青与酸性石料粘附性,沥青混合料的水稳定性、高温稳定性等均具有明显的提高。通过与某一级公路路面混合料,以及与掺入石灰岩石屑的沥青混合料的对比,掺入0.3%新型沥青抗剥落剂(MAS)的沥青混合料具有更好的动稳定度与高低温性能。     

非胺类沥青抗剥落剂的制备及性能

以含磷羟基有机物为主要成分制备了一种非胺类沥青抗剥落剂,并用水煮法、热老化试验和热重分析研究了其有关性能.结果表明,以采用w（LOP）=15%,w（SP）=5%配方配制的抗剥落剂掺入沥青后,可大大提高沥青与酸性石料的粘附性,使沥青与酸性石料的粘附性等级由1～3级提高至5级,并在热老化后仍能保持良好的效果;以单十二烷基磷酸酯和硅胶H为代表,通过红外光谱和溶剂淋洗实验初步探讨了抗剥落剂的作用机理.结果表明,单十二烷基磷酸酯在硅胶H表面上的吸附符合Langmuir吸附等温式,且这种吸附为化学吸附.     

酸性集料在沥青混凝土路面修筑中的应用

结合实践经验，阐述了石料酸碱性对沥青粘附性的影响及石料性能的检验，从多方面提出了改善沥青与矿料粘附性措施，并对混合料的性能检验作了分析研究。     

水泥改进沥青混合料抗水损害性能试验研究

花岗岩是一种酸性石料,它具有强度高,耐磨性好等优点,但是由于花岗岩和沥青的粘附性不好。往往因为达不到相应的设计要求而影响到花岗岩沥青混合料的运用。本文通过研究水泥改进沥青混合料抗水损害,探索运用海南地区的花岗岩作为沥青混合料原材料,从而降低海南地区的沥青混合料的造价。     

磨细钢渣粉对花岗岩沥青混合料水损害的影响

花岗岩沥青混合料由于因地制宜、造价低廉等优点,已得到了大量的应用。由于花岗岩本身属于酸性石料,其与沥青的结合料容易遭受水损害的特性也限制了它的进一步发展。文章尝试将磨细的钢渣粉应用到其中达到变废为宝,改善花岗岩沥青混合料水稳性的目的。实验中运用水煮法测粘附性实验,以及改进的马歇尔稳定度实验、冻融循环实验等评价了磨细的钢渣粉对花岗岩沥青混合料水稳性的影响。实验结果表明,用磨细钢渣粉代替石灰石矿粉能提高沥青胶浆与花岗岩的粘附性,显著提高马歇尔的残留稳定度以及劈裂强度比,对花岗岩沥青混合料的抗水损害能力有很好的改善作用。     

沥青混合料动态蠕变模量与动稳定度的关系

研究了分别基于AC13和AC25优化出的9组级配、SBS改性中海70#沥青和中海70#沥青两种结合料、花岗岩和石灰岩两种集料以及50,70 mm两种车辙试件厚度等条件下的沥青混合料动稳定度(DS)与车辙模量(E_(DS)),E_(DS)与动态蠕变劲度模量(S_(dy)),S_(dy)与DS这三者的关系.结果表明,不同沥青混合料的S_(dy)与采用厚度匹配的车辙试件DS之间存在良好的相关性.因此可以将DS转换为S_(dy),并用其作为沥青路面结构设计的参数.     

利用表面自由能法对添加消石灰的WMA水稳定性的研究

温拌沥青混合料在摊铺行业应用越来越多。尽管温拌沥青有许多优点,水稳定性是温拌沥青混合料潜在的不利因素之一,所以有必要在这一领域进行更多的研究,以提高温拌沥青性能。在研究中,熟石灰作为改善沥青混合料的水稳定性的抗剥落剂,用表面自由能法对集料和沥青之间的粘结性进行了分析。该实验采用了石灰岩和花岗岩两种类型的集料,并用asphamin作为温拌剂,熟石灰作为抗剥落剂。结果表明,熟石灰增加了沥青对集料的浸润性,提高了沥青和集料之间的附着力。添加消石灰的样品,沥青-集料与水-集料的表面自由能相差不大。这说明如果发生剥落则需要更多的能量,也就是消石灰提高了温拌沥青混合料的抗水损害性能。     

陶粒与环氧沥青粘附性能研究

对玄武岩、石灰岩、碎石形陶粒和圆形陶粒四种集料采用改进后的水浸法试验评价其与环氧沥青的粘附性,综合研究了玄武岩、碎石形陶粒和圆形陶粒环氧沥青混合料的水稳定性,试验结果表明,碎石形陶粒和圆形陶粒与环氧沥青粘附性能优于玄武岩集料,且碎石形陶粒的最优。     

Fatigue behavior of SMA and HMA mixtures

Fatigue crack is a main form of structural damage in flexible pavements. Under the action of repeated vehicular loading, deterioration of the asphalt concrete materials in pavements caused by the accumulation and growth of the micro and macro cracks gradually takes place. The indirect tensile tests was carried out on hot mix asphalt HMA and stone matrix asphalt SMA mixtures comprising different nominal maximum aggregate sizes NMAS in three temperatures of 5, 25 and 40 °C. Stiffness modulus, fatigue lives and fatigue prediction equation of the mixtures were developed and characterized in terms of aggregate gradation type, coarseness and fineness of gradation, temperature and asphalt content.     

沥青路面水损害的原因分析及防治措施

介绍了沥青路面水损坏现象的类型、根本原因和影响沥青路面水稳定性的因素。提出了路面结构层均应采用水稳定性好的密实型沥青混合料、改善沥青与矿料之间的黏附性、提高沥青混合料压实标准及设置路面结构内部排水系统等防治措施。     

Morlife300抗剥落剂性能

采用旋转薄膜烘箱加热试验对掺Morlife300抗剥落剂前后沥青的耐久性进行了评价,通过延长水煮时间和沥青与抗剥落剂共同老化评价了Morlife300抗剥落剂对改善集料与沥青黏附性能的贡献能力;以花岗岩AC-13C为研究对象,基于沥青混合料性能目标开展了马歇尔试验、车辙试验、水稳性试验、加速老化试验、浸水肯塔堡飞散试验...     

抗剥落剂的温度稳定性研究

抗剥落剂的使用是为了改善沥青与石料间的粘附性,从而扩大了道路工程上石料的选择范围,有利于就地取材。本文研究了有机胺类抗剥落剂在高温和低温冻融作用后的有效性,为工程上正确选用和使用胺类抗剥落剂提供依据。     

Determination of fine aggregate angularity in relation with the resistance to rutting of hot-mix asphalt

Rutting in asphalt pavements continues to create problems for pavement agencies. One factor that has been identified in determining asphalt pavement rutting susceptibility is the fine aggregate angularity (FAA) in the asphalt aggregate mix. The aim of this study is to investigate the angularity of fine aggregate produced in Turkey and to draw the attention of design engineers to this subject. To examine the relative effect of angularity of fine aggregate on the passing time through an orifice, material was obtained from 30 different sources which represent a wide range of materials used in Turkey. This collection offered a variety of geometric irregularities. The aggregates included 4 natural sands and 26 crushed aggregates. ASTM C128 “Specific Gravity Test of Fine Aggregate” and AFNOR P18-564 “Determination of Flow Rate of Fine Aggregate” which has been adopted by AFNOR were performed on each sample. Rutting tests were then performed on four different aggregate samples which had different FAA values and which were crushed by different crusher types. Test results bring to light that factors like the mineralogical properties of the fine aggregate and the crusher type must be considered in determining the angularity of fine aggregate. Also rutting test results showed that higher FAA values increased resistance to rutting of hot-mix asphalt.     

Use of aggregates produced from marble quarry waste in asphalt pavements

More than 95% of asphalt pavement materials (by weight) consist of aggregates. The highway and construction industries consume a huge amount of aggregates annually causing considerable energy and environmental losses. The aggregates are usually produced from neighborhood aggregate quarries or from natural aggregate sources. As a result of the increasing demands for new aggregate quarries, the general texture of earth's surface has been steadily deteriorating, causing environmental concerns. The use of marble wastes from marble quarries as aggregates might help meet the increasing demands and slow down any detrimental effects on the environment. In this study, recycled aggregates produced from homogeneous marble and andesite quarry wastes in Afyonkarahisar–Iscehisar region were compared to two other aggregate specimens currently used in Afyonkarahisar city asphalt pavements. Los Angeles abrasion, aggregate impact value, freezing and thawing, flakiness index and Marshall stability flow tests were carried out on the aggregate specimens. The test results indicate that the physical properties of the aggregates are within specified limits and these waste materials can potentially be used as aggregates in light to medium trafficked asphalt pavement binder layers.     

Application of Markov chains and Monte Carlo simulations for developing pavement performance models for urban network management

Existing performance models developed for interurban pavements are not applicable to urban pavements due to differences in traffic demands and deterioration trends. The objective of the study was to develop performance models for the management of urban pavement networks. Markov chains and Monte Carlo simulation were applied to account for the probabilistic nature of pavements deterioration over time, using data collected in the field. One of the advantages of this methodology is that it can be used by local agencies with scarce technical resources and historical data. Eight performance models were developed and successfully validated for asphalt and concrete pavements in humid, dry and Mediterranean climates with different functional hierarchies. The resulting models evidence the impact of design, traffic demand, climate and construction standards on urban pavements performance. Predicted service life of asphalt and concrete pavements in primary networks are consistent with design standards. However, pavements in secondary and local networks present shorter and longer service life compared to design life, respectively. Climate is a relevant factor for asphalt pavements, where higher deterioration was observed compared to that expected. Opposite to this, no relevant differences between design and performance can be attributed to climate in concrete pavements.