濟(jì)南水泥穩(wěn)定碎石質(zhì)量控制指南：配合比、碾壓、養(yǎng)護(hù)，這些細(xì)節(jié)決定道路壽命

　　Jinan Cement Stabilized Crushed Stone Quality Control Guidelines: Mix Proportion, Rolling, and Maintenance, These Details Determine the Lifespan of Roads

　　在濟(jì)南修建道路，水泥穩(wěn)定碎石（簡(jiǎn)稱(chēng)水穩(wěn)）是不可或缺的基層材料，它的質(zhì)量直接關(guān)系到道路的整體強(qiáng)度和使用壽命。很多人覺(jué)得水穩(wěn)施工很簡(jiǎn)單，只要把水泥、碎石和水拌在一起鋪好就行，其實(shí)不然，水穩(wěn)的質(zhì)量控制涉及配合比設(shè)計(jì)、拌合、運(yùn)輸、攤鋪、碾壓、養(yǎng)護(hù)等多個(gè)環(huán)節(jié)，任何一個(gè)細(xì)節(jié)出問(wèn)題，都可能導(dǎo)致道路基層開(kāi)裂、沉降，影響道路質(zhì)量。今天就結(jié)合濟(jì)南本地的實(shí)際情況，給大家詳細(xì)講講水泥穩(wěn)定碎石的質(zhì)量控制要點(diǎn)。

　　In the construction of roads in Jinan, cement stabilized crushed stone (abbreviated as water stabilized) is an indispensable base material, and its quality directly affects the overall strength and service life of the road. Many people think that water stability construction is very simple, as long as cement, gravel, and water are mixed together and laid well. However, this is not the case. Quality control of water stability involves multiple aspects such as mix design, mixing, transportation, paving, rolling, and maintenance. Any detail that goes wrong can lead to cracking and settlement of the road base, affecting the quality of the road. Today, based on the actual situation in Jinan, I will explain in detail the quality control points of cement stabilized crushed stone.

　　首先是配合比設(shè)計(jì)，這是水穩(wěn)質(zhì)量控制的基礎(chǔ)。配合比設(shè)計(jì)不合理，后續(xù)施工再規(guī)范也難以保證質(zhì)量。在濟(jì)南，水穩(wěn)的配合比設(shè)計(jì)主要考慮水泥劑量、骨料級(jí)配和含水量三個(gè)因素。水泥劑量過(guò)低，水穩(wěn)的強(qiáng)度不足；水泥劑量過(guò)高，不僅增加成本，還容易導(dǎo)致水穩(wěn)收縮開(kāi)裂。一般來(lái)說(shuō)，濟(jì)南地區(qū)道路基層的水泥劑量控制在 3%-7% 之間，具體數(shù)值要根據(jù)道路等級(jí)和交通量確定。骨料級(jí)配要連續(xù)均勻，最大粒徑不超過(guò) 31.5mm，這樣才能保證水穩(wěn)的密實(shí)度和穩(wěn)定性。含水量要適中，過(guò)多或過(guò)少都會(huì)影響水穩(wěn)的壓實(shí)度，最佳含水量需要通過(guò)擊實(shí)試驗(yàn)確定。

　　Firstly, the mix design is the foundation of water stability quality control. The mix design is unreasonable, and even if the construction is standardized later, it is difficult to ensure quality. In Jinan, the mix design of water stability mainly considers three factors: cement dosage, aggregate gradation, and moisture content. The cement dosage is too low, and the strength of water stability is insufficient; Excessive cement dosage not only increases costs, but also easily leads to water stable shrinkage and cracking. Generally speaking, the cement dosage for road base in Jinan area is controlled between 3% and 7%, and the specific value depends on the road grade and traffic volume. The aggregate grading should be continuous and uniform, with a maximum particle size not exceeding 31.5mm, in order to ensure the compactness and stability of water stability. The moisture content should be moderate, as too much or too little can affect the compaction degree of water stability. The optimal moisture content needs to be determined through compaction tests.

　　其次是拌合環(huán)節(jié)，要確保水泥和骨料充分混合均勻。在濟(jì)南，很多工地采用集中廠(chǎng)拌的方式生產(chǎn)水穩(wěn)，拌合時(shí)要嚴(yán)格按照配合比控制各種材料的用量，特別是水泥劑量和含水量。水泥劑量不足會(huì)導(dǎo)致水穩(wěn)強(qiáng)度不夠，含水量過(guò)高會(huì)使水穩(wěn)在碾壓時(shí)出現(xiàn)彈簧現(xiàn)象，含水量過(guò)低則會(huì)使水穩(wěn)難以壓實(shí)。拌合好的水穩(wěn)要顏色均勻，沒(méi)有離析現(xiàn)象，這樣才能保證攤鋪后的質(zhì)量。

　　Secondly, in the mixing process, it is necessary to ensure that the cement and aggregates are thoroughly and evenly mixed. In Jinan, many construction sites use centralized factory mixing to produce water stability. During mixing, the dosage of various materials, especially cement dosage and moisture content, must be strictly controlled according to the mix proportion. Insufficient cement dosage can lead to insufficient water stability strength, high water content can cause spring phenomenon during rolling, and low water content can make it difficult to compact water stability. The mixed water should have a uniform color and no segregation to ensure the quality after paving.

　　運(yùn)輸和攤鋪環(huán)節(jié)也不能忽視。水穩(wěn)從拌合站運(yùn)到工地后，要及時(shí)攤鋪，避免長(zhǎng)時(shí)間放置導(dǎo)致水分蒸發(fā)和水泥水化反應(yīng)。攤鋪時(shí)要控制好攤鋪厚度和速度，厚度要均勻一致，速度要與拌合、運(yùn)輸能力相匹配。濟(jì)南的夏季氣溫較高，水分蒸發(fā)快，攤鋪時(shí)要注意保濕，必要時(shí)可以在骨料上灑水降溫。

　　The transportation and paving processes cannot be ignored either. After the water is transported from the mixing station to the construction site, it should be spread in a timely manner to avoid prolonged storage that may cause water evaporation and cement hydration reaction. When paving, it is necessary to control the thickness and speed of the paving. The thickness should be uniform and consistent, and the speed should match the mixing and transportation capacity. The summer temperature in Jinan is relatively high, and water evaporates quickly. When paving, attention should be paid to moisture retention, and if necessary, water can be sprayed on the aggregates to cool down.

　　碾壓是保證水穩(wěn)密實(shí)度的關(guān)鍵環(huán)節(jié)。碾壓不足會(huì)導(dǎo)致水穩(wěn)空隙率過(guò)大，強(qiáng)度不足；碾壓過(guò)度則會(huì)使骨料破碎，影響水穩(wěn)的穩(wěn)定性。碾壓時(shí)要遵循 “先輕后重、先慢后快、先邊后中” 的原則，先用輕型壓路機(jī)初壓，再用重型壓路機(jī)復(fù)壓，最后用輕型壓路機(jī)終壓收面。碾壓過(guò)程中要及時(shí)檢查壓實(shí)度，確保達(dá)到設(shè)計(jì)要求。

　　Rolling is a key step in ensuring water stability and compactness. Insufficient compaction can lead to excessive water stable porosity and insufficient strength; Excessive compaction can cause the aggregate to break, affecting the stability of water stability. When rolling, the principle of "light first, then heavy; slow first, then fast; edge first, then center" should be followed. First, use a light roller for initial compaction, then use a heavy roller for re compaction, and finally use a light roller for final compaction and finishing. During the rolling process, the compaction degree should be checked in a timely manner to ensure that it meets the design requirements.

　　養(yǎng)護(hù)環(huán)節(jié)同樣重要，很多人容易忽視。水穩(wěn)攤鋪碾壓完成后，要及時(shí)進(jìn)行養(yǎng)護(hù)，保持表面濕潤(rùn)，避免水分過(guò)快蒸發(fā)。在濟(jì)南，夏季養(yǎng)護(hù)時(shí)間一般不少于 7 天，冬季養(yǎng)護(hù)時(shí)間要適當(dāng)延長(zhǎng)。養(yǎng)護(hù)期間要禁止車(chē)輛通行，防止水穩(wěn)被破壞。如果養(yǎng)護(hù)不到位，水穩(wěn)的強(qiáng)度會(huì)受到很大影響，容易出現(xiàn)開(kāi)裂、松散等問(wèn)題。

　　The maintenance process is equally important and often overlooked by many people. After the water stable paving and rolling are completed, timely maintenance should be carried out to keep the surface moist and avoid rapid evaporation of moisture. In Jinan, the summer maintenance time is generally not less than 7 days, and the winter maintenance time should be appropriately extended. During the maintenance period, vehicles are prohibited from passing to prevent damage to water stability. If the maintenance is not in place, the strength of water stability will be greatly affected, and problems such as cracking and loosening are prone to occur.

　　除了以上幾個(gè)主要環(huán)節(jié)，材料質(zhì)量也直接影響水穩(wěn)的質(zhì)量。水泥要選用合格的產(chǎn)品，過(guò)期水泥堅(jiān)決不能使用；骨料的含泥量要嚴(yán)格控制，含泥量過(guò)高會(huì)降低水穩(wěn)的強(qiáng)度和穩(wěn)定性；水要使用清潔的飲用水，不能使用污水或含有雜質(zhì)的水。

　　In addition to the above main links, material quality also directly affects the quality of water stability. Qualified products should be used for cement, and expired cement must not be used; The mud content of aggregates should be strictly controlled, as excessive mud content can reduce the strength and stability of water stability; Clean drinking water should be used for water, and sewage or water containing impurities should not be used.

　　總之，濟(jì)南水泥穩(wěn)定碎石的質(zhì)量控制是一個(gè)系統(tǒng)工程，需要從配合比設(shè)計(jì)到養(yǎng)護(hù)的每個(gè)環(huán)節(jié)都嚴(yán)格把控。只有這樣，才能保證道路基層的質(zhì)量，建設(shè)出安全、耐用的道路工程。希望這些建議能幫到在濟(jì)南搞道路工程的朋友們，祝大家施工順利！

　　In short, the quality control of cement stabilized crushed stone in Jinan is a systematic project that requires strict control at every stage from mix design to maintenance. Only in this way can we ensure the quality of the road base and build safe and durable road projects. I hope these suggestions can help friends who are engaged in road engineering in Jinan. I wish everyone a smooth construction!