道路修完通车，非常怕什么？不是路面不够黑不够平，而是没用多久就出现裂缝、坑槽、下沉。很多人把问题归咎于沥青面层，其实真正的元凶，往往藏在沥青下面那层看不见的结构里。

What are you most afraid of after the road is repaired and opened to traffic? It's not that the road surface is not black or flat enough, but rather that cracks, potholes, and sinking appear shortly after. Many people attribute the problem to the asphalt surface layer, but the real culprit often lies in the invisible structure beneath the asphalt.

道路是分层的，每一层都有分工

The road is layered, and each layer has a division of labor

一条合格的道路，从下到上通常由路基、垫层、基层和面层组成。面层就是大家看到的沥青砼，直接承受车轮突出和气候侵蚀；基层则承担着把面层传来的荷载扩散到路基的任务。基层如果强度不够、稳定性差，面层再厚也撑不住，开裂和下沉迟早发生。

A qualified road usually consists of subgrade, cushion layer, base layer, and surface layer from bottom to top. The surface layer is the asphalt concrete that everyone sees, which directly bears the rolling of wheels and climate erosion; The grassroots is responsible for spreading the load transmitted from the surface layer to the roadbed. If the strength and stability of the base layer are not sufficient, no matter how thick the surface layer is, it cannot support it, and cracking and sinking will occur sooner or later.

水泥稳定碎石，为什么是基层的主力材料？

Why is cement stabilized crushed stone the main material for the base layer?

水泥稳定碎石是目前道路基层中用得非常广泛的材料之一。它的原理不复杂：用水泥作为胶结料，把级配碎石粘结成一个整体，形成具有一定强度和板体性的结构层。相比纯碎石基层，它的承载能力更强、抗变形能力更好；相比混凝土基层，它又具有一定的柔韧性，能适应路基的微小沉降，不容易脆断。这个平衡点，正是它被大量用于市政道路和公路工程的原因。

Cement stabilized crushed stone is currently one of the most widely used materials in road subgrade. Its principle is not complicated: using cement as a binder to bond graded crushed stones into a whole, forming a structural layer with certain strength and board properties. Compared to pure crushed stone base, it has stronger bearing capacity and better deformation resistance; Compared to concrete base, it has a certain degree of flexibility and can adapt to small settlement of the roadbed, making it less prone to brittle fracture. This balance point is precisely why it is widely used in municipal roads and highway engineering.

水稳层做得好不好，关键看这几步

Whether the water stable layer is done well or not depends on these steps

水泥稳定碎石的施工，有几个环节直接决定非常终质量。一是配合比设计，水泥用量、碎石级配、含水量都要经过试验确定，水泥少了强度不够，多了容易干缩开裂。二是拌合均匀度，水泥和碎石建议充分搅拌均匀，局部水泥集中会导致收缩裂缝。三是突出时机，从拌合到突出完成有时间限制，超过水泥初凝时间再突出，结构强度会大打折扣。四是养护，水稳层突出完成后需要保湿养护，让水泥充分水化，养护不到位强度上不来，表面还会起皮松散。

There are several stages in the construction of cement stabilized crushed stone that directly determine the final quality. One is the mix design, where the cement dosage, crushed stone grading, and moisture content must be determined through experiments. Insufficient cement may result in insufficient strength, while excessive cement may lead to drying shrinkage and cracking. The second is the uniformity of mixing. Cement and crushed stone must be thoroughly mixed evenly, as localized cement concentration can lead to shrinkage cracks. The third is the timing of compaction. There is a time limit from mixing to compaction completion. If compaction is carried out after the initial setting time of cement, the structural strength will be greatly reduced. The fourth is maintenance. After the water stable layer is compacted, it needs to be moisturized and cured to allow the cement to fully hydrate. If the maintenance is not in place, the strength will not increase, and the surface will also peel and loosen.

沥青面层和基层，配合才是关键

The key is the coordination between the asphalt surface layer and the base layer

沥青砼面层的质量同样重要，但它的表现很大程度上取决于基层是否平整、密实。基层不平，面层摊铺厚度就不均匀，薄的地方容易早期损坏；基层不密实，面层突出时会产生不均匀沉降，形成波浪和裂缝。所以道路施工中常说“基层是根，面层是脸”，根基不稳，脸面再好看也维持不了多久。

The quality of asphalt concrete surface layer is equally important, but its performance largely depends on whether the base layer is flat and dense. If the base layer is uneven, the thickness of the surface layer will be uneven, and thin areas are prone to early damage; The base layer is not compacted, and uneven settlement will occur when the surface layer is rolled, forming waves and cracks. So in road construction, it is often said that 'the base is the root, and the surface is the face'. If the foundation is unstable, no matter how beautiful the face is, it cannot last long.

材料生产和施工，非常好是一家人

Material production and construction, preferably as a family

道路材料的质量，三分靠配方，七分靠生产控制和施工配合。沥青砼的拌合温度、级配精度、运输时间，水稳料的含水量、拌合均匀性，这些参数在运输和摊铺过程中都会变化。如果材料生产和现场施工分属不同单位，出了问题容易互相推诿。现在越来越多的道路工程倾向于选择具备材料生产能力和施工资质的单位，从拌合站到摊铺现场形成一条线，质量责任清晰，出了问题也能快速追溯。

The quality of road materials depends on three parts formula and seven parts production control and construction coordination. The mixing temperature, grading accuracy, transportation time, moisture content, and mixing uniformity of asphalt concrete will all change during transportation and paving. If the material production and on-site construction belong to different units, it is easy to shift the blame to each other when problems arise. More and more road projects nowadays tend to choose units with material production capabilities and construction qualifications, forming a line from the mixing station to the paving site, with clear quality responsibilities and quick traceability in case of problems.

道路是城市的血管，修一次要用很多年。面层下面那些看不见的结构层，才是真正决定这条路能撑多久的关键。

Roads are the blood vessels of a city, and it takes many years to repair them once. The invisible structural layers beneath the surface layer are the key to determining how long this road can last.