温拌沥青混合料技术及最新研究

针对热拌和冷拌沥青混合料各自的缺点,开发了一种拌和温度介于两者之间的新型沥青混合料-温拌沥青混合料。温拌沥青混合料主要有四类,其中最近开发的一类是基于乳化沥青的温拌沥青混合料。这种温拌沥青混合料拌和温度在80-120℃之间。经过国内外试验表明,基于乳化沥青的温拌沥青混合料可完全达到热拌沥青混合料的性能。     

改性沥青抗变形能力研究

以测力延度（温度为5℃,拉速为5 cm/min）及15℃的弹性恢复对基质沥青及其不同SBS加入量的改性沥青进行抗变形能力的评价,通过对测力延度曲线的分析,探索基质沥青及SBS改性沥青拉伸过程中的规律,研究改性沥青抗变形能力。     

Evaluation of rutting resistance of asphalt binders and asphalt mixtures modified with polyphosphoric acid

In this research, a polyphosphoric acid (PPA) additive was used to modify a performance graded binder (PG 58-22). Experimental program included use of three PPA contents (0.5%, 1%, and 1.5%) by weight of bitumen and use of antistripping limestone aggregates. High-temperature rheological properties of asphalt binders were evaluated through the frequency sweep test. Complex modulus test was also used to evaluate rutting characteristics of asphalt mixtures. Results showed that PPA significantly improved rutting resistance of both unmodified asphalt binder and unmodified asphalt mixture, especially for the asphalt binder.     

冷再生铣刨回收沥青混合料微表处技术研究

研究了铣刨回收沥青混合料在微表处中的应用，通过实例介绍了铣刨回收沥青混合料的检验与评价、冷再生稀浆混合料材料选择技术要点及配合比设计流程和方法。研究了冷再生稀浆混合料的施工性能和路用性能，并做对比试验路段对研究成果进行了验证。     

柔性基层沥青混合料配合比设计研究

针对柔性基层这一特殊层位进行了系统的配合比设计研究,结合实际给出了5种沥青混合料的级配范围,通过马歇尔试验,按照现行规范的流程,分别确定出各级配的最佳油石比。并依据柔性基层抗车辙和抗水损坏能力的需要,对其进行了相应的性能验证试验,结果表明各级配沥青混合料均能很好满足相关规范的要求。     

Performance of warm asphalt mixtures using Sasobit

The performance of limestone warm mix asphalt mixtures using Sasobit over control mixtures was investigated. The Superpave mixture design method was used to prepare control and Sasobit-modified mixtures. The indirect tensile and dynamic creep tests were used for fatigue and rutting evaluation, respectively. The main findings of this research were the noticed lower accumulated strains and resilient modulus for Sasobit-modified mixtures over control mixtures in rutting performance testing. On the other hand, higher creep stiffness values in fatigue testing for Sasobit-modified mixtures were observed over control mixtures for deviator loads that ranges from 1 to 2 KN. Moreover, better fatigue resistance at lower temperatures was also observed for both control and Sasobit-modified mixtures.     

岩沥青改性沥青路用性能试验研究

通过车辙试验、冻融劈裂试验及汉堡轮辙试验对两种不同岩沥青改性沥青混合料的路用性能进行试验研究;并与70号普通道路石油沥青混合料进行了汉堡轮辙试验对比。在试验研究的基础上对使用岩沥青改性沥青后沥青混合料的路用性能进行了分析。     

SEAM沥青混合料高温稳定性影响因素的灰关联熵分析

通过车辙试验.分析了掺入SEAM的AC-13沥青混合料高温抗车辙性能的影响因素,并运用灰关联熵分析法对SEAM掺量、沥青针入度、沥青当量软化点、沥青用量、4.75 mm筛孔通过率、沥青混合料空隙率等影响因素进行分析。研究表明,SEAM掺量、空隙率和沥青当量软化点对SEAM沥青混合料高温稳定性有重要影响。     

温拌橡胶沥青发展现状及展望

为更好地阐述温拌橡胶沥青发展现状,对废橡胶粉及橡胶沥青材料进行了分析,对国内外代表性温拌剂产品进行了介绍和点评。归纳总结了温拌橡胶沥青在国内外的应用发展情况,并提出了温拌橡胶沥青进一步研究解决的热点问题及发展方向。     

新旧沥青调和再生规律研究

沥青路面再生技术运用中,软沥青可以作为再生剂使用。通过常规物理指标、SHRP指标和感温指标来分析新旧沥青在调和过程中的性能变化规律,帮助理解沥青再生的原理。     

The effect of warm additive on the properties and behavior of an asphalt binder

Use of warm asphalt mix has been recently receiving a great attention because it allows decreasing production and distribution temperatures about 30–40°C by either reducing bitumen viscosity or enhancing mixture performance. These mixes also have other advantages such as a low pollution, reduced fuel consumption, and more implementation seasons. Despite these benefits, there is a constant concern about the performance of these mixes under the conditions such as permanent deformation, fatigue cracking, and low-temperature cracking. In the present study, two types of bitumen modifiers including liquid additive and Sasobit were used to adjust rheological properties of bitumen. After conducting the required tests on bitumen specimens prepared using these two additives and comparing the results obtained from two common and Strategic Highway Research Program tests under aged and nonaged conditions, it was revealed that, considering the viscosity of bitumen, these additives improve bitumen performance at ambient temperatures. Besides, the results indicate the improvement in rutting criteria (G^*/sinδ) and fatigue criterion (G^*×sinδ).     

温拌沥青混合料发展现状

在沥青混合料生产过程中,温拌与传统的热拌相比,拌和温度较低,减少了能量的消耗和有害气体的排放,且具有良好的路用性能,是一种新型的节能环保型施工工艺,具有广阔的应用前景。通过国内外文献调研,论述了温拌沥青混合料的优势与特点、发展历程、现有制备工艺的种类、技术原理、温拌效果及存在的问题。     

掺加岩沥青的沥青混合料性能评价

岩沥青的掺量直接影响了混合料的路用性能,也对工程的经济性产生巨大影响。通过车辙试验、浸水马歇尔试验、冻融劈裂试验和低温小梁弯曲试验,分别评价了不同岩沥青掺量的混合料的高温性能、水稳定性和低温性能。研究认为,随着岩沥青掺量的增加,其对混合料路用性能的影响逐渐减弱,当掺量由20%增加到25%时,性能变化很小。因此,在工程应用中,建议岩沥青的掺量宜小于20%。     

硅藻土改性沥青性能研究

采用美国SHRP计划动态剪切试验方法，对添加硅藻土的改性沥青的流变性能和相转变进行考察。结栗表明：沥青添加硅藻土后，能改善沥青的高温性能；加入硅藻土后，玻璃化温度降低，沥青的相转变界线模糊，改善了沥青的低温性能。     

Influence of asphalt chemical composition on moisture susceptibility of asphalt mixtures

To evaluate sensitivity of moisture damage resistance with chemical composition of asphalt, the adhesion energy, debonding energy as well as compatibility ratio of 69 asphalt-aggregate combinations were calculated with thermodynamical models. Pearson correlation analysis and regression analysis were carried out to correlate the relationships between asphalt chemical composition (saturates, aromatics, resins, asphaltenes, and wax) and moisture stability of asphalt mixture. The results showed that more resins and less asphaltenes in asphalt could lead to better moisture stability of asphalt mixture under dry and wet conditions, which can be effectively predicted by multiple regression models with different asphalt chemical components.     

道路沥青及SBS改性沥青的紫外老化研究

采用紫外辐射试验对道路沥青和SBS改性沥青进行加速老化试验研究.利用老化前后的软化点、针八度、延度和四组分变化。分析了道路沥青的紫外线老化机理。结果表明:随紫外线老化时间的延长,道路沥青和SBS改性沥青软化点呈上升趋势、针入度和延度呈降低变化趋势,其中又以延度变化最为明显。经紫外线老化后道路沥青和SBS改性沥青的四组分也有变化,其中沥青质略微上升、芳香分略微降低,而饱和分和胶质变化不大。     

Evaluation of Fatigue and Rutting Behavior of Asphalt Binder Containing Warm Additive

In this research study, Sasobit as warm additive was used to modify original binder (60/70 penetration grade). The binder fatigue and rutting performance was evaluated through linear amplitude sweep (LAS) and multiple stress creep and recovery test, respectively. Results indicated that 3% Sasobit modified binder has the highest percent recovery value and the lowest J_nr value, but had the highest sensitivity to a sudden increase in the stress level inside the asphalt mixture. The LAS test results demonstrated that the fatigue behavior of asphalt binders modified with 1% Sasobit is the highest one.     

热再生沥青混合料的性能试验——威海市利用再生沥青筑路的实践

介绍了山东省威海市公路局利用废旧沥青混合料铺筑再生沥青路面的情况，以及对热再生沥青混合料技术性能的详细试验研究。     

Characterization of rutting resistance of EBS-modified asphalt mixtures

Driven by Kyoto protocol to reduce the gas emission, warm mix asphalt (WMA) as an alternative of hot mix asphalt has gained huge interest among researchers. Despite many advantages, rutting resistance of WMAs is always questionable. In this study, ethylene bis(stearamide) (EBS) was used as a wax-based additive to produce WMAs. Samples were produced at three different compaction temperatures. To evaluate rutting resistance of mixtures, all cylindrical specimens were tested by dynamic creep and dynamic modulus tests at various compaction temperatures. Results indicate that rutting resistance of EBS-modified samples are remarkable, especially when compaction temperature is low.     

乳化SBS改性沥青和SBR改性乳化沥青对比试验

SBR改性乳化沥青容易生产,低温性能好,是目前公路工程中常用的改性乳化沥青；而乳化SBS改性沥青的高温性能好,更适应炎热地区使用。在实验基础上,对比两种乳化沥青的生产工艺、性能及造价,乳化SBS改性沥青具有良好的推广应用前景。