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.

二灰穩定碎石加工的基層是石灰、粉煤灰穩定粒料的基礎層，當然我們也可以叫做二灰結石或三渣基層，它是將適量的石灰和粉煤灰混合在粒料中，根據一定的技術要求和極佳含水量，混合拌和均勻，壓實，經養生成型的一種路面基層。二灰穩定碎石基層的類型屬于半剛性基層，具有明顯的水硬性、緩凝性、板體性、特定的抗裂性，但磨損性下降，強度受溫度和濕度的影響較大。二灰穩定碎石基層的原材料可以就地取材，建設方便，強度高，比較容易獲得，具有與貧混凝土相似的性質，水穩定性、抗裂性更好。由于這些優點，二灰穩定碎石基層得到了廣泛應用。

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.

水泥穩定碎石基層要求，原材料的質量控制，原材料是路面工程的物質基礎，嚴把材料質量關是保證工程質量的基礎和重要環節?；旌土系呐浜媳仍O計通過對工程實際應用的礦料分別進行篩分試驗和測定其相對密度，根據各種礦料的顆粒級配和計算用量比調配出合理的級配曲線?，F場試驗段的施工根據公路路面基層施工技術規范及國內外實踐經驗，高等級公路路面基層（底基層）施工前采用計劃使用的機械設備和初步確定的混和料的配合比鋪筑試驗段是不可缺少的步驟。混和料的運輸，運輸混和料宜采用大噸位（15T以上）的自卸運輸車，在卸料和運輸過程中要盡量避免中途停車和顛簸，以確?；旌土系难舆t時間和混和料均不產生離析，此時，還要根據運輸距離和天氣情況，考慮混和料是否采用苫蓋，以防水分過分損失及表層散失過大。

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.

水泥穩定碎石施工首先要把握三個關鍵環節，把握檢測關,每天對原材料級配和含水量、混合料級配和含水量、水泥劑量和粉煤灰含量、壓實度和無側限抗壓強度進行檢測。把握時間關,由于水穩碎石的結合材料---水泥的固有特性，時間因素對整個施工過程尤為重要，施工中要嚴密組織、科學控制拌和—運輸—攤鋪—碾壓等各道工序，確保施工一次成功，一般從混合料拌和到碾壓結束的時間不超過2小時。把握養護關,養護對水泥穩定碎石基層的強度形成和干縮性影響非常大，所以要充分重視水穩基層的養護工作。派專人負責對已完水泥穩定碎石基層進行養護，養護采用麻袋濕養，養生期不少于14天，養生期間禁止一切車輛通行。

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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