水泥穩(wěn)定碎石是以級配碎石作骨料，采用一定數(shù)量的膠凝材料和足夠的灰漿體積填充骨料的空隙，按嵌擠原理攤鋪壓實。其壓實度接近于密實度，強度主要靠碎石間的嵌擠鎖結(jié)原理，同時有足夠的灰漿體積來填充骨料的空隙。它的初期強度高，并且強度隨齡期而增加很快結(jié)成板體，因而具有較高的強度，抗?jié)B度和抗凍性較好。水穩(wěn)水泥用量一般為混合料3%∽7%，7天的無側(cè)限抗壓強度可達1.5∽4.0%MPA，較其他路基材料高。水穩(wěn)成活后遇雨不泥濘，表面堅實，是路面的理想基層材料。

Cement stabilized macadam is made using graded crushed stone as aggregate, filled with a certain amount of cementitious material and sufficient mortar volume to fill the voids in the aggregate, and paved and compacted according to the interlocking principle. Its compaction degree is close to its density, and its strength mainly relies on the interlocking and locking principle between the crushed stones, while there is sufficient mortar volume to fill the voids in the aggregate. It has high initial strength and its strength increases rapidly with age, forming a plate-like structure. Therefore, it has high strength, good impermeability, and good frost resistance. The amount of water-stabilized cement is generally 3% to 7% of the mixture, and its unconfined compressive strength after 7 days can reach 1.5 to 4.0 MPA, which is higher than other subgrade materials. After water stabilization, it remains solid in the face of rain and is an ideal base material for pavement.

水泥穩(wěn)定碎石基層要求，原材料的質(zhì)量控制，原材料是路面工程的物質(zhì)基礎(chǔ)，嚴把材料質(zhì)量關(guān)是保證工程質(zhì)量的基礎(chǔ)和重要環(huán)節(jié)?；旌土系呐浜媳仍O(shè)計通過對工程實際應(yīng)用的礦料分別進行篩分試驗和測定其相對密度，根據(jù)各種礦料的顆粒級配和計算用量比調(diào)配出合理的級配曲線。現(xiàn)場試驗段的施工根據(jù)公路路面基層施工技術(shù)規(guī)范及國內(nèi)外實踐經(jīng)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(shè)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(chǎn)生離析，此時，還要根據(jù)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 macadam base, quality control of raw materials, raw materials are the material basis of pavement engineering, and strictly controlling material quality is the foundation and important link to ensure engineering quality. The mix design of the mixture involves screening tests and measuring the relative density of the mineral aggregates actually used in the project. Based on the particle gradation of various mineral aggregates and the calculated dosage ratio, a reasonable gradation curve is formulated. The construction of the on-site test section follows the technical specifications for highway pavement base construction and practical experience at home and abroad. It is an indispensable step to pave the test section using the planned mechanical equipment and the preliminarily determined mix ratio of the mixture before the construction of the high-grade highway pavement base (subbase). For the transportation of the mixture, it is advisable to use dump trucks with a large tonnage (over 15T). During unloading and transportation, it is necessary to avoid stopping and bumps as much as possible to ensure that the delay time of the mixture and the mixture itself do not undergo segregation. At this time, it is also necessary to consider whether to cover the mixture according to the transportation distance and weather conditions to prevent excessive moisture loss and excessive surface loss.

水泥穩(wěn)定碎石施工首先要把握三個關(guān)鍵環(huán)節(jié)，把握檢測關(guān),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(cè)限抗壓強度進行檢測。把握時間關(guān),由于水穩(wěn)碎石的結(jié)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(jié)束的時間不超過2小時。把握養(yǎng)護關(guān),養(yǎng)護對水泥穩(wěn)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(wěn)基層的養(yǎng)護工作。派專人負責對已完水泥穩(wěn)定碎石基層進行養(yǎng)護，養(yǎng)護采用麻袋濕養(yǎng)，養(yǎng)生期不少于14天，養(yǎng)生期間禁止一切車輛通行。

In the construction of cement stabilized macadam, it is crucial to grasp three key aspects: quality control through testing, timely execution, and proper maintenance. Quality control involves daily testing of raw material gradation and moisture content, mixture gradation and moisture content, cement dosage and fly ash content, compaction degree, and unconfined compressive strength. Timely execution is particularly important due to the inherent characteristics of cement, the binding material of water stabilized macadam. During construction, all processes such as mixing, transportation, paving, and rolling must be strictly organized and scientifically controlled to ensure a successful construction. Generally, the time from mixture mixing to the end of rolling should not exceed 2 hours. Proper maintenance is crucial for the strength formation and dry shrinkage resistance of the cement stabilized macadam base. Therefore, special personnel should be assigned to take responsibility for the maintenance of the completed cement stabilized macadam base. The maintenance method involves wetting with gunny bags, and the curing period should not be less than 14 days. During this period, all vehicles are prohibited from passing.