Cement stabilized crushed stone is a mixture of a certain amount of cementitious material and sufficient mortar volume to fill the voids in the aggregate, and is spread and compacted according to the principle of compaction. The degree of compaction is close to the compactness, and the strength is mainly achieved by the interlocking principle between the crushed stones, with sufficient mortar volume to fill the gaps in the aggregate. Its initial strength is high, and its strength increases rapidly with age to form a board, thus possessing high strength, good impermeability and frost resistance. After water stabilization, it does not get muddy in rain and has a solid surface, making it an ideal base material for advanced road surfaces.

二灰稳定碎石加工的基层是石灰、粉煤灰稳定粒料的基础层，当然我们也可以叫做二灰结石或三渣基层，它是将适量的石灰和粉煤灰混合在粒料中，根据一定的技术要求和含水量，混合拌和均匀，压实，经养生成型的一种路面基层。二灰稳定碎石基层的类型属于半刚性基层，具有明显的水硬性、缓凝性、板体性、特定的抗裂性，但磨损性下降，强度受温度和湿度的影响较大。二灰稳定碎石基层的原材料可以就地取材，建设方便，强度高，比较容易获得，具有与贫混凝土相似的性质，水稳定性、抗裂性更好。由于这些优点，二灰稳定碎石基层得到了广泛应用。

The base layer of lime and fly ash stabilized crushed stone processing is the foundation layer of lime and fly ash stabilized granular materials. Of course, we can also call it the lime and fly ash base layer or the three slag base layer. It is a pavement base layer that mixes an appropriate amount of lime and fly ash in the granular materials, according to certain technical requirements and excellent moisture content, evenly mixed, compacted, and formed through curing. The type of lime fly ash stabilized crushed stone base belongs to semi rigid base, which has obvious hydraulic properties, retarding properties, board properties, and specific crack resistance. However, its wear resistance decreases, and its strength is greatly affected by temperature and humidity. The raw materials for the lime fly ash stabilized crushed stone base can be obtained locally, which is convenient for construction, high in strength, and relatively easy to obtain. It has properties similar to lean concrete, and has better water stability and crack resistance. Due to these advantages, the lime fly ash stabilized crushed stone base has been widely used.

水泥稳定碎石基层要求，原材料的质量控制，原材料是路面工程的物质基础，严把材料质量关是保证工程质量的基础和重要环节。混和料的配合比设计通过对工程实际应用的矿料分别进行筛分试验和测定其相对密度，根据各种矿料的颗粒级配和计算用量比调配出合理的级配曲线。现场试验段的施工根据公路路面基层施工技术规范及国内外实践经验，高等级公路路面基层（底基层）施工前采用计划使用的机械设备和初步确定的混和料的配合比铺筑试验段是不可缺少的步骤。混和料的运输，运输混和料宜采用大吨位（15T以上）的自卸运输车，在卸料和运输过程中要尽量避免中途停车和颠簸，以确保混和料的延迟时间和混和料均不产生离析，此时，还要根据运输距离和天气情况，考虑混和料是否采用苫盖，以防水分过分损失及表层散失过大。

Requirements for cement stabilized crushed stone base, quality control of raw materials, raw materials are the material foundation of pavement engineering, and strict control of material quality is the foundation and important link to ensure engineering quality. The mix proportion design of mixed materials is achieved by conducting screening tests and measuring the relative density of the mineral materials used in practical engineering applications. Based on the particle grading of various mineral materials and the calculated dosage ratio, a reasonable grading curve is formulated. The construction of the on-site trial section is based on the technical specifications for the construction of highway pavement base layer and practical experience at home and abroad. It is an indispensable step to use planned mechanical equipment and preliminarily determined mix proportions to pave the trial section before the construction of high-grade highway pavement base layer (sub base layer). For the transportation of mixed materials, it is recommended to use large tonnage (over 15T) dump trucks. During the unloading and transportation process, it is necessary to avoid stopping and bumping midway to ensure that the delay time of the mixed materials and the mixed materials do not produce segregation. At this time, it is also necessary to consider whether the mixed materials should be covered with tarpaulins based on the transportation distance and weather conditions to prevent excessive water loss and surface loss.

水泥稳定碎石施工要把握三个关键环节，把握检测关,每天对原材料级配和含水量、混合料级配和含水量、水泥剂量和粉煤灰含量、压实度和无侧限抗压强度进行检测。把握时间关,由于水稳碎石的结合材料---水泥的固有特性，时间因素对整个施工过程尤为重要，施工中要严密组织、科学控制拌和—运输—摊铺—碾压等各道工序，确保施工一次成功，一般从混合料拌和到碾压结束的时间不超过2小时。把握养护关,养护对水泥稳定碎石基层的强度形成和干缩性影响非常大，所以要充分重视水稳基层的养护工作。派专人负责对已完水泥稳定碎石基层进行养护，养护采用麻袋湿养，养生期不少于14天，养生期间禁止一切车辆通行。

The construction of cement stabilized crushed stone should first grasp three key links, and grasp the testing key. Daily testing should be conducted on the grading and moisture content of raw materials, the grading and moisture content of mixtures, the cement dosage and fly ash content, compaction degree, and unconfined compressive strength. Seize the timing. Due to the inherent characteristics of cement, the binding material of water stabilized crushed stone, the time factor is particularly important for the entire construction process. During construction, it is necessary to closely organize and scientifically control various processes such as mixing, transportation, paving, and rolling to ensure a successful construction. Generally, the time from mixing the mixture to the end of rolling should not exceed 2 hours. Grasp the maintenance key, and maintenance has a significant impact on the strength formation and dry shrinkage of cement stabilized crushed stone base. Therefore, it is necessary to fully pay attention to the maintenance work of water stabilized base. Assign a dedicated person to be responsible for the maintenance of the completed cement stabilized crushed stone base, using hemp bag wet curing. The curing period shall not be less than 14 days, and all vehicles are prohibited from passing during the curing period.

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