2.1 原路面處理針對(duì)原路面的鉆心取樣結(jié)果及舊路質(zhì)量狀況評(píng)定, 確定合理的處治方式, 對(duì)于原路面沉陷路段, 采用級(jí)配碎石調(diào)平, 使原路面的高程及橫坡滿(mǎn)足設(shè)計(jì)要求范圍內(nèi);對(duì)于沉陷嚴(yán)重且翻漿路段, 需高度重視, 應(yīng)挖除原路基淤泥或軟基土等非適用材料, 換填透水性較好和強(qiáng)度較高的天然砂礫或碎礫石, 處理完成后在進(jìn)行下道工序。

　　2.1 Original pavement treatment: Based on the core sampling results of the original pavement and the evaluation of the quality of the old road, a reasonable treatment method is determined. For the sunken sections of the original pavement, graded crushed stones are used for leveling to ensure that the elevation and cross slope of the original pavement meet the design requirements; For road sections with severe subsidence and frost heave, high attention should be paid to excavating unsuitable materials such as original roadbed silt or soft foundation soil, and replacing them with natural gravel or crushed gravel with good permeability and high strength. After the treatment is completed, the next process can be carried out.

　　2.2 確定水泥撒布量無(wú)機(jī)結(jié)合料穩(wěn)定材料強(qiáng)度是否滿(mǎn)足實(shí)際要求, 與水泥劑量有比較直接的關(guān)系, 根據(jù)實(shí)驗(yàn)報(bào)告數(shù)據(jù), 干密度、寬度和深度及水泥劑量, 計(jì)算出每平方水泥撒布量, 然后在撒布車(chē)電腦上輸入計(jì)算用量, 在撒布之前, 試驗(yàn)人員準(zhǔn)備一張1m×1m的薄鐵皮, 撒布車(chē)通過(guò)后, 稱(chēng)量鐵皮上的水泥數(shù)量, 與撒布車(chē)電腦上設(shè)置的數(shù)據(jù)復(fù)核, 試驗(yàn)人員要準(zhǔn)確反復(fù)對(duì)撒布車(chē)電腦設(shè)置數(shù)據(jù)與實(shí)際撒布量進(jìn)行復(fù)核, 否則此項(xiàng)工作應(yīng)多次進(jìn)行, 直到相符為止。同時(shí), 工地試驗(yàn)室EDTA滴定試驗(yàn)同步跟進(jìn)。另外, 每次水泥撒布面不宜太大, 能保證再生機(jī)有連續(xù)作業(yè)面即可, 以防風(fēng)吹雨淋造成水泥損失。

　　2.2 Determine whether the cement spreading amount and inorganic binder stabilizing material strength meet the actual requirements, which is directly related to the cement dosage. Based on the experimental report data, dry density, width and depth, and cement dosage, calculate the spreading amount per square meter of cement. Then input the calculated dosage on the spreading car computer. Before spreading, the tester prepares a thin iron sheet of 1m × 1m. After the spreading car passes through, weigh the amount of cement on the iron sheet and verify it with the data set on the spreading car computer. The tester should accurately and repeatedly verify the data set on the spreading car computer with the actual spreading amount. Otherwise, this work should be repeated multiple times until it matches. At the same time, the EDTA titration test in the construction site laboratory is being followed up synchronously. In addition, the cement spreading surface should not be too large each time, as long as it can ensure a continuous working surface for the recycling machine to prevent cement loss caused by wind and rain.

　　2.3 控制再生厚度作為冷再生質(zhì)量控制的關(guān)鍵指標(biāo), 再生機(jī)后安排專(zhuān)人檢查銑刨厚度, 在每刀縱向人工清理出銑刨深度, 再與未再生路面相比較, 對(duì)比是否符合設(shè)計(jì)要求, 對(duì)于原路面基層強(qiáng)度較高時(shí), 一次無(wú)法達(dá)到銑刨深度, 應(yīng)分二次或多次銑刨, 同時(shí), 實(shí)驗(yàn)人員在檢測(cè)壓實(shí)度的同時(shí), 檢測(cè)再生深度, 確保再生深度符合設(shè)計(jì)要求。

　　2.3 Controlling the regeneration thickness is a key indicator for cold regeneration quality control. After the regeneration machine, a dedicated person is arranged to inspect the milling thickness, manually clean the milling depth in each longitudinal direction, and compare it with the unreleased road surface to see if it meets the design requirements. For the original road surface with high base strength, if the milling depth cannot be achieved in one time, it should be milled twice or multiple times. At the same time, the experimenters should check the regeneration depth while checking the compaction degree to ensure that the regeneration depth meets the design requirements.

　　2.4 嚴(yán)格控制壓實(shí)質(zhì)量再生混合料中一般含有30%~40%的瀝青混合料, 應(yīng)嚴(yán)格控制壓路機(jī)的噸位和突出遍數(shù), 再生機(jī)后應(yīng)配備1臺(tái)不小于26t的單鋼輪壓路機(jī)進(jìn)行初壓, 初壓整平結(jié)束后, 再用1臺(tái)26t單鋼輪振動(dòng)壓路機(jī)復(fù)壓4~6遍, 非常后用1臺(tái)30t輪胎壓路機(jī)終壓6~8遍。突出完成后, 應(yīng)及時(shí)進(jìn)行壓實(shí)度檢測(cè)。

　　2.4 Strictly control the compaction quality. Recycled mixtures generally contain 30% to 40% asphalt mixture. The tonnage and number of rolling passes of the roller should be strictly controlled. After the regeneration machine, a single steel wheel roller with a capacity of not less than 26t should be equipped for initial compaction. After the initial compaction and leveling are completed, a 26t single steel wheel vibrating roller should be used for 4-6 times of re compaction, and finally a 30t tire roller should be used for 6-8 times of final compaction. After compaction is completed, timely compaction degree testing should be carried out.

　　2.5 養(yǎng)生養(yǎng)生是水泥穩(wěn)定無(wú)機(jī)結(jié)合料施工質(zhì)量控制的關(guān)鍵環(huán)節(jié), 水泥穩(wěn)定類(lèi)基層一般選取氣溫較高季節(jié)施工, 水份散失快, 如果施工地點(diǎn)水源較近, 可選擇透水性土工材料覆蓋養(yǎng)生, 灑水車(chē)及時(shí)補(bǔ)充水份。如果水源地距施工現(xiàn)場(chǎng)較遠(yuǎn), 則考慮使用一布一膜不透水土工布, 在覆蓋之前, 將底基層表面有效灑濕, 然后覆蓋不透水土工布, 關(guān)鍵點(diǎn)就是四周要包裹嚴(yán)實(shí)。

　　2.5 Health preservation is a key link in the quality control of cement stabilized inorganic binder construction. Cement stabilized base layers are generally constructed in seasons with high temperatures, where water loss is fast. If the construction site is close to a water source, permeable geotechnical materials can be used to cover the health preservation, and water trucks can be used to replenish water in a timely manner. If the water source is far away from the construction site, consider using a one cloth one film impermeable geotextile. Before covering, thoroughly wet the surface of the subgrade layer, and then cover it with impermeable geotextile. The key point is to wrap it tightly around.

　　3 結(jié)語(yǔ)冷再生作為一種新興公路施工技術(shù), 可縮短工期、提高作業(yè)效率, 減少了環(huán)境污染, 節(jié)省工程成本, 較適合應(yīng)用于二、三級(jí)公路的底基層或基層, 值得推廣應(yīng)用。

　　3 Conclusion As a new highway construction technology, cold recycling can shorten the construction period, improve the operation efficiency, reduce environmental pollution, and save project costs. It is more suitable for the subbase or base of Class II and third-class highway, and is worth popularizing.

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