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新铺沥青混合料面层异常现象与防治措施

来源:http://www.ycgjglcl.com/ 日期:2023-01-06
众所周知,沥青路面施工是一项复杂的系统工程,个别项目受施工水平、内在因素及外部环境影响,施工过程中沥青混合料面层出现泛红、推移、泛白等异常现象,不仅影响了沥青面层表观质量,使内在质量留下隐患,而且不同程度的影响了沥青路面耐久性。下面济南沥青料厂家来讲讲新铺沥青混合料面层异常现象与防治措施。
As we all know, asphalt pavement construction is a complex system project. Some projects are affected by the construction level, internal factors and external environment. During the construction process, asphalt mixture pavement appears red, moving, white and other abnormal phenomena, which not only affect the apparent quality of asphalt pavement, leaving hidden dangers for the internal quality, but also affect the durability of asphalt pavement to varying degrees. Next, Jinan asphalt manufacturer will talk about the abnormal phenomena and prevention measures of newly paved asphalt mixture surface.
表面泛红
Reddish surface
沥青由不同分子量的碳氢化合物及其非金属衍生物组成,常温下为黑色或黑褐色的粘稠液体或固体,在沥青混合料中主要起胶结作用。通常情况下,普通沥青混合料为黑色,改性沥青呈黑亮光泽。表面泛红主要表现在胶轮碾压后,粗集料棱角、细集料的颗粒表面沥青膜剥落、发泛红现象。
Asphalt is composed of hydrocarbons with different molecular weights and their non-metallic derivatives. It is a black or dark brown viscous liquid or solid at room temperature, which mainly plays a cementing role in asphalt mixture. Generally, the common asphalt mixture is black, and the modified asphalt is black and shiny. The surface reddening is mainly manifested in the asphalt film peeling off and reddening on the surface of coarse aggregate corners and fine aggregate particles after rubber wheel rolling.
沥青混合料结构类型不同,施工后的表观状态、色泽也存在差异。SMA沥青胶浆多,一般不用胶轮压路机,表面泛红现象较少;AC、Superpave密级配沥青混合料以胶轮压路机揉压为主,在胶轮高温反复揉搓作用下,表面容易出现泛红现象;ATB沥青稳定碎石虽然是密级配沥青混合料,一般大多采用普通道路石油沥青,加之级配粗、油石比小,出现泛红现象反而少。
The apparent state and color of asphalt mixture after construction are different due to different structure types. SMA has a lot of asphalt mortar. Generally, rubber tyred rollers are not used, and the surface is less red; AC, Superpave dense graded asphalt mixture is mainly rubbed by rubber wheel roller, and under the action of repeated rubbed rubber wheel at high temperature, the surface is prone to reddening; Although ATB asphalt stabilized macadam is a dense asphalt mixture, it generally uses ordinary road petroleum asphalt. In addition, the grading is coarse and the asphalt stone ratio is small, so there is less red phenomenon.
泛红主要是由于沥青与集料粘附性差引起的,同时与材料自身性质、施工工艺等相关,若多方面影响因素叠加,将导致表面出现严重泛红、沥青膜剥离现象,直接影响路面表观质量,同时对后期使用性能留下质量隐患。
The redness is mainly caused by the poor adhesion between asphalt and aggregate, and is related to the nature of the material itself, construction technology, etc. If multiple factors overlap, it will lead to serious redness on the surface and asphalt film peeling, which will directly affect the apparent quality of the pavement, and at the same time leave a quality hazard for the later use performance.
济南沥青料
桥面泛白
Whitening of bridge deck
随着水分的不断蒸发,白色可溶性物质干燥后出现泛白现象。随着时间推移,在雨水及车辆荷载反复作用下,内部水化及冲刷作用不断加剧,短时间内便出现严重唧浆现象,终导致桥面沥青铺装层产生局部坑槽、松散,给行车带来大隐患,大大缩短路面使用寿命。
With the continuous evaporation of water, white soluble substances appear white after drying. With the passage of time, under the repeated action of rain and vehicle load, the internal hydration and scouring effect are increasingly intensified, and serious grout pumping occurs in a short period of time, which eventually leads to local potholes and looseness of the bridge deck asphalt pavement, which brings great potential safety hazards to driving and greatly shortens the service life of the short circuit surface.
桥面泛白主要出现在连续降雨天气之后,早期表现为局部渗水。通常情况下,桥梁伸缩缝处出现的早,其次是纵坡相对较小、弯坡桥及存在高路段。对于单幅两车道桥面沥青铺装层,通常出现在高内侧,行车道容易出现局部泛白;单幅三车道的中间车道,一般泛白现象较为突出,无论是纵坡大或直线段、弯坡桥均匀发生,出现的几率及分布范围要比单幅二车道的大且早。
Whitening of the bridge deck mainly occurs after continuous rainfall, and it is manifested as local seepage in the early stage. Generally, the bridge expansion joints appear early, followed by relatively small longitudinal slopes, curved bridges and high sections. For single width two lane bridge deck asphalt pavement, it usually appears on the inner side of the high side, and the carriageway is prone to local whitening; In the middle lane of a single three lane road, the whitening phenomenon is generally more prominent. Whether the longitudinal slope is large or the straight section and curved slope bridge occur evenly, the probability and distribution range of the occurrence are larger and earlier than those of a single two lane road.
沥青面层容易出现泛白的部位大都容易积水,雨水滞留时间较长且结构内部自由水多、排水不畅,重载车辆荷载及动水冲刷作用频繁,这些条件加剧了桥面沥青铺装层泛白、唧浆的发生。
The parts where the asphalt pavement is prone to whitening are prone to ponding, the rainwater stays for a long time, there is more free water in the structure, the drainage is not smooth, and the heavy vehicle load and dynamic water scouring are frequent. These conditions aggravate the occurrence of whitening and pumping of the asphalt pavement on the bridge deck.
究其原因,一方面由于施工期间降雨频繁、各结构层施工不连续,另一方面因沥青面层自身空隙率、渗水系数偏大,再者与沥青混合料特征、施工水平及质量控制措施有关,其次与桥面防排水设计、临时排水措施等有直接关系。
The reasons are, on the one hand, frequent rainfall and discontinuous construction of each structural layer during the construction period, on the other hand, large porosity and permeability coefficient of asphalt pavement itself, on the other hand, related to asphalt mixture characteristics, construction level and quality control measures, and secondly, directly related to bridge deck waterproof and drainage design, temporary drainage measures, etc.
须认真对待沥青路面施工过程中出现的新现象、新问题,及时采取整改及处治技术措施。遵照沥青路面全寿命周期理念,不断强化施工细节与施工过程质量管理,是确保表观质量与内在质量的有效措施,您对此有怎样的问题点可以来我们网站http://www.ycgjglcl.com留言咨询!
New phenomena and problems arising in the construction of asphalt pavement shall be seriously treated, and technical measures for rectification and treatment shall be taken in time. It is an effective measure to ensure the apparent and internal quality by following the whole life cycle concept of asphalt pavement and constantly strengthening the quality management of construction details and construction process. Please come to our website for any questions http://www.ycgjglcl.com Message consultation!
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