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.
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.
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.
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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