水泥穩(wěn)定碎石作用原理：水泥穩(wěn)定碎石是以級(jí)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(shí)。其壓實(shí)度接近于密實(shí)度，強(qiáng)度主要靠碎石間的嵌擠鎖結(jié)原理，同時(shí)有足夠的灰漿體積來填充骨料的空隙。它的初期強(qiáng)度高，并且強(qiáng)度隨齡期而增加很快結(jié)成板體，因而具有較高的強(qiáng)度，抗?jié)B度和抗凍性較好。水泥穩(wěn)定碎石水泥用量一般為混合料3%～6%，7天的無側(cè)限抗壓強(qiáng)度可達(dá)5.0Mpa，較其他路基材料高。水泥穩(wěn)定碎石成活后遇雨不泥濘，表面堅(jiān)實(shí)，是高級(jí)路面的理想基層材料。水泥穩(wěn)定碎石均屬中粒土

　　Principle of cement stabilized crushed stone: Cement stabilized crushed stone is made of graded crushed stone as aggregate, filled with a certain amount of cementitious material and sufficient mortar volume to fill the gaps in the aggregate, and spread and compact according to the principle of interlocking. Its compaction degree is close to that of compactness, and its strength mainly relies on the interlocking principle between crushed stones, while having sufficient mortar volume to fill the voids of the aggregate. Its initial strength is high, and the strength increases quickly with age to form a board, thus it has high strength, good impermeability and frost resistance. The cement dosage for cement stabilized crushed stone is generally 3% to 6% of the mixture, and the unconfined compressive strength after 7 days can reach 5.0 Mpa, which is higher than other roadbed materials. Cement stabilized crushed stone, after survival, does not become muddy in the rain and has a solid surface, making it an ideal base material for high-grade road surfaces. Cement stabilized crushed stone belongs to medium grained soil

　　水穩(wěn)施工的要點(diǎn)：1原材料1．I水泥水穩(wěn)碎石結(jié)構(gòu)層對(duì)原材料的要求較高，水泥作為***的一種穩(wěn)定劑通常情況下使用硅酸鹽水泥的穩(wěn)定效果更好一些。一般采用P．032．5級(jí)緩凝水泥，要求水泥初凝時(shí)間大于3小時(shí)，終凝時(shí)間大于6小時(shí)，禁止使用快硬水泥、早強(qiáng)水泥。采用散裝水泥時(shí)，剛出爐的水泥要存放7天以后使用，以保證其安定性合格。夏季高溫作業(yè)時(shí)水泥入罐溫度不能高于50℃。1．2碎石對(duì)于半剛性基層路面結(jié)構(gòu)，基層要承受荷載，應(yīng)具有一定的荷載擴(kuò)散能力。集料自身強(qiáng)度及級(jí)配組成都對(duì)水泥穩(wěn)定碎石基層的承載能力有重要的影響。為防止裂縫產(chǎn)生，碎石的質(zhì)量必須嚴(yán)格要求：(1)碎石應(yīng)選擇含泥量小，顆粒穩(wěn)定無雜物。(2)碎石應(yīng)滿足級(jí)配要求。碎石的級(jí)配在滿足規(guī)范要求范圍的同時(shí)，要盡可能控制在規(guī)范級(jí)配范圍中值偏下。規(guī)范規(guī)定級(jí)配碎石的比較大粒徑不宜大于37.5mm。

　　Key points of water stable construction: 1. Raw materials 1. Cement water stable crushed stone structure layer has high requirements for raw materials, and cement is usually used as a stabilizer for * * *. Generally, the stability effect is better when using Portland cement. Generally, P.032.5 grade retarding cement is used, with an initial setting time of more than 3 hours and a final setting time of more than 6 hours. The use of fast hardening cement and early strength cement is prohibited. When using bulk cement, the freshly baked cement should be stored for 7 days before use to ensure its stability is qualified. During high-temperature operations in summer, the temperature of cement entering the tank should not exceed 50 ℃. 1.2 For semi-rigid base pavement structures, the base layer should bear loads and have a certain load spreading ability. The strength and gradation composition of aggregates have a significant impact on the bearing capacity of cement stabilized crushed stone base. To prevent the occurrence of cracks, the quality of crushed stone must be strictly required: (1) crushed stone should be selected with low mud content, stable particles and no impurities. (2) The crushed stone should meet the grading requirements. The grading of crushed stone should be controlled as much as possible below the median value of the standard grading range while meeting the requirements of the specifications. The standard stipulates that the relatively large particle size of graded crushed stone should not exceed 37.5mm.

　　應(yīng)盡快將拌和的混合料運(yùn)送到鋪筑現(xiàn)場，混合料在運(yùn)輸過程中必須覆蓋，以減少水分損失。如運(yùn)輸車輛中途出現(xiàn)故障，應(yīng)盡**除，如車內(nèi)混合料不能在初凝時(shí)間內(nèi)運(yùn)到工地，或預(yù)計(jì)混合料到碾壓**終完成的延遲時(shí)間超過水泥初凝時(shí)間，必須予以廢棄。5攤鋪前應(yīng)***下臥層表面的浮土、積水等，并將作業(yè)面灑水濕潤。對(duì)于下基層表面，宜噴灑水泥凈漿，按水泥質(zhì)量計(jì)，不少于1.0～1.5kg/m2。水泥凈漿稠度以能灑布均勻?yàn)橐耍瑸⒉奸L度以不大于攤鋪機(jī)**0～40m為宜。6斜交結(jié)構(gòu)物兩側(cè)等攤鋪機(jī)無法工作的部位采用人工攤鋪，應(yīng)控制好操作時(shí)間、松鋪厚度和平整度。

　　The mixed material should be transported to the paving site as soon as possible, and the mixture must be covered during transportation to reduce moisture loss. If there is a malfunction in the transport vehicle during transportation, it should be removed as soon as possible. If the mixture in the vehicle cannot be transported to the construction site within the initial setting time, or if the expected delay time for the mixture to be rolled exceeds the initial setting time of the cement, it must be discarded. Before paving, the surface of the underlying layer should be cleaned of floating soil, accumulated water, etc., and the working surface should be moistened with water. For the surface of the lower base layer, it is advisable to spray cement paste, which should not be less than 1.0-1.5kg/m2 based on the quality of cement. The consistency of cement slurry should be evenly distributed, and the spraying length should not exceed 0-40m of the paver. The areas on both sides of the inclined structure where the paver cannot work should be manually paved, and the operation time, loose paving thickness, and flatness should be controlled well.

　　混和料的拌和（1）根據(jù)試驗(yàn)確定的配合比，各級(jí)料的比例，水泥劑量，比較好含水量均勻、穩(wěn)定的拌和；（2）根據(jù)各級(jí)原材料的含水量確定拌和機(jī)的加水量，根據(jù)施工氣溫條件調(diào)整含水量，調(diào)整含水量在比較好含水量基礎(chǔ)上提高0.5%-1.0%；（3）當(dāng)原材料顆粒組成發(fā)生變化，應(yīng)及時(shí)調(diào)整各冷料倉比例；（4）嚴(yán)格掌控水泥添加劑量，防止水泥用量忽多忽少，不穩(wěn)定現(xiàn)象；（5）保持拌和機(jī)穩(wěn)定連續(xù)生產(chǎn)；（6）拌料過程中安排試驗(yàn)人員對(duì)集料含水率和水泥灰劑量進(jìn)行檢測。水泥穩(wěn)定級(jí)配碎石的定義。

　　Mixing of mixtures (1) Based on the experimentally determined mix ratio, proportions of each grade of material, cement dosage, and a relatively uniform and stable water content for mixing; (2) Determine the amount of water added to the mixer based on the moisture content of raw materials at all levels, adjust the moisture content according to the construction temperature conditions, and increase the moisture content by 0.5% -1.0% on the basis of a better moisture content; (3) When the composition of raw material particles changes, the proportion of each cold storage bin should be adjusted in a timely manner; (4) Strictly control the amount of cement added to prevent the fluctuation of cement dosage and instability; (5) Maintain stable and continuous production of the mixer; (6) During the mixing process, arrange testing personnel to check the moisture content of the aggregate and the amount of cement ash. Definition of cement stabilized graded crushed stone.

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