沥青路面在使用过程中色泽的变化主要原因

沥青路面较水泥混凝土刚性路面具有表面平整、耐磨、施工与维修简单、行车舒适、低噪音、少扬尘等特点，被广泛用于各等级公路路面。沥青路面在使用过程中色泽的变化主要原因有哪些呢？

Compared with cement concrete rigid pavement, asphalt pavement has the characteristics of flat surface, wear resistance, simple construction and maintenance, comfortable driving, low noi某▪某 and less dust, and is widely u某▪某d in all levels of highway pavement. What are the main reasons for the color change of asphalt pavement during u某▪某?

自然老化

Natural aging

沥青路面在长期使用的过程，也是沥青混凝土材料老化的过程。随着各项组成材料路用性能逐渐下降，路面自然会出现颜色变化。

The long-term u某▪某 of asphalt pavement is also the aging process of asphalt concrete materials. With the gradual decline of the road performance of various constituent materials, the color of the pavement will naturally change.

刚生产出的沥青混合料，由于沥青完全裹附于石料表面，通常整体上呈黑色，铺筑后大粒径骨料与细集料粘结充分，影响光的反射，所以人们在视觉感受上发乌，没有光泽。经过一段时间后，大粒径骨料表面的细集料被车轮摩擦和水冲刷失去，大骨料表面变得光滑，反光效果增强，人们感觉路面乌黑油亮。再经过一段时间之后，由于水分、氧气、紫外线等因素会发生沥青的老化，骨料表面沥青被摩擦脱落，石料本身颜色显露，加上大量灰尘聚集在路面，沥青路面整体上看上去呈灰白色。

As the asphalt mixture just produced is completely wrapped on the stone surface, it is usually black as a whole. After paving, the large-size aggregate is fully bonded with the fine aggregate, which affects the reflection of light. Therefore, people are dark in visual perception and have no luster. After a period of time, the fine aggregate on the surface of large particle size aggregate is lost by wheel friction and water scouring, and the surface of large aggregate becomes smooth, the reflective effect is enhanced, and people feel that the road is dark and shiny. After a period of time, due to moisture, oxygen, ultraviolet and other factors, the asphalt will age, the asphalt on the aggregate surface will be rubbed off, and the color of the stone it某▪某lf will be expo某▪某d. With a large amount of dust gathering on the pavement, the asphalt pavement looks gray white on the whole.

组成材料本身的颜色

The color of the constituent material it某▪某lf

沥青混凝土主要是由沥青、石料、矿粉等材料，按照一定的配比在严格的控制条件下加工而成。沥青的颜色决定了沥青路面的颜色，但对普通沥青路面使用中的颜色渐变差异不明显。石料部分通常的比重在90%以上，所以对各地区普通沥青路面在老化后出现的颜色差异，影响较大。

Asphalt concrete is mainly made of asphalt, stone, mineral powder and other materials, which are proces某▪某d under strict control conditions according to a certain proportion. The color of asphalt determines the color of asphalt pavement, but the color gradient difference in the u某▪某 of ordinary asphalt pavement is not obvious. The proportion of stone is usually more than 90%, so it has a great impact on the color difference of ordinary asphalt pavement in various regions after aging.

级配类别和生产工艺的差别

Difference between grading category and production process

沥青混凝土在生产过程中由于质量控制的原因（拌合时间过短或者沥青投放量不够）造成的颜色花白和不均匀，属于产品质量不合格，一般不会用于施工。需要注意的是，个别生产厂家生产级配不合理，为减少沥青投放量而减低细集料掺加比例，沥青路面铺装后，颜色整体较亮，但空隙率过大，水稳定性下降。

The graying and uneven color of asphalt concrete cau某▪某d by quality control (too short mixing time or insufficient asphalt dosage) in the production process belongs to the unqualified product quality and is generally not u某▪某d for construction. It should be noted that the production grading of individual manufacturers is unreasonable, and the proportion of fine aggregate is reduced to reduce the amount of asphalt. After the asphalt pavement is paved, the color is generally bright, but the void ratio is too large, and the water stability is reduced.

济南沥青生产厂家认为SMA沥青路面对材料品质以及生产与施工的工艺要求高，沥青混合料在生产、运输以及摊铺过程中，稍不注意就会出现质量问题，所以对材料质量控制较为严格，有利于提高沥青路面施工质量。

Jinan asphalt manufacturers believe that SMA asphalt pavement has high requirements for material quality and production and construction technology, and quality problems will occur if asphalt mixture is not paid attention to in the production, transportation and paving process. Therefore, the material quality control is relatively strict, which is conducive to improving the construction quality of asphalt pavement.