很多项目经理一看到网裂、车辙、唧浆，第一反应是铣刨拉走、买新水稳回填。算完总账才发现：废料外运+新料运输+基层重做，基层成本直接超预算三成。只要旧路路基没整体沉陷、没被油污泡透，就地冷再生往往更划算——旧沥青面层连部分基层原地打碎，掺水泥重拌，变成新基层。

Many project managers' first reaction when they see cracks, ruts, and mud pumping is to mill and pull them away, and buy new water to stabilize the backfill. After calculating the general ledger, it was discovered that the cost of transporting waste materials, transporting new materials, and redoing the grassroots directly exceeded the budget by 30%. As long as the old roadbed is not completely sunken or soaked by oil stains, on-site cold recycling is often more cost-effective - the old asphalt surface layer and part of the base layer are crushed in place, mixed with cement again, and become a new base layer.

但“能再生”和“再生完能过钻芯”是两件事，租设备前把下面几条钉死：

But "being able to regenerate" and "being able to pass through the core after regeneration" are two different things. Before renting equipment, nail the following:

机型跟深度、宽度走。小区路、县乡道、厂区路，国产550/600型够用；国省干线或全深式再生（处理深度20公分以上），直接上维特根2500/250S这类大马力机。非常大拌深建议比设计深度多留5公分，不然底部老料拌不透，钻芯一拉就散。

The model follows the depth and width. Residential roads, county and township roads, factory roads, domestic 550/600 models are sufficient; National and provincial trunk lines or full depth regeneration (processing depth of more than 20 centimeters), directly mounted on high-power engines such as the Wittgen 2500/250S. The maximum mixing depth must be 5 centimeters deeper than the design depth, otherwise the old material at the bottom cannot be mixed thoroughly and the drill core will scatter as soon as it is pulled.

水泥和含水率现场盯。旧料先钻芯做级配，水泥常用42.5普通硅酸盐、终凝6小时以上，别用早强水泥——初凝太快，压路机还没收尾就结板。剂量一般4%到6%，用方格网或粉料撒布车均匀布灰；含水量控制在非常佳值+1%到+2%，补偿突出蒸发。

Cement and moisture content on-site monitoring. Drill the core of the old material first for grading, and commonly use 42.5 ordinary Portland cement with a final setting time of more than 6 hours. Do not use early strength cement - the initial setting is too fast and the roller is not yet finished before the board is formed. The dosage is generally 4% to 6%, and the ash is evenly spread using a grid or powder spreader; Control the moisture content at the optimal value of+1% to+2% to compensate for rolling evaporation.

时间链卡在初凝前。再生机行走速度4到6米/分钟，相邻幅重叠20公分以上，专人跟车挖验看有没有“漏刀”。从加水拌和到终压结束一气呵成，中间别停机吃饭。

The time chain is stuck before the initial setting. The walking speed of the regeneration machine is 4 to 6 meters per minute, with adjacent sections overlapping by more than 20 centimeters. A dedicated person will follow the vehicle to dig and inspect for any "missing knives". From adding water and mixing to the end of the final pressure, do not stop the machine to eat.

突出和养生别偷。轻压稳边、重振到压实度97%以上、胶轮收面；压完立刻盖土工布洒水，封闭交通养7天。很多反射裂缝不是面层问题，是再生层没养够就放行重车。

Don't steal crushing and health preservation. Gently press and stabilize the edges, restore to a compaction degree of over 97%, and use rubber wheels to finish the surface; Immediately cover with geotextile and sprinkle water after pressing, and close the traffic for 7 days. Many reflection cracks are not surface layer problems, but rather the release of heavy vehicles due to insufficient maintenance of the regeneration layer.

再说租设备本身的坑，比施工更常见：

Moreover, the pit of renting equipment itself is more common than construction:

第一，合同写死品牌、型号、工作宽度、非常大深度、出厂编号，口头“来一台冷再生”等于没约定。

Firstly, if the contract specifies the brand, model, working width, maximum depth, and factory number, verbally stating 'a cold recycling machine' is equivalent to no agreement.

第二，计费想清楚。路况清楚、工期紧，按平米包干非常稳；旧路硬度不明、可能频繁停机，按台班算但要写明雨天停工不算钱、故障误工扣租期。

Secondly, think carefully about the billing. Clear road conditions and tight schedule, the most stable contract is based on square meters; The hardness of the old road is unknown, and there may be frequent shutdowns. It should be calculated based on the number of shifts, but it should be clearly stated that shutdowns on rainy days are not counted as money, and the rental period will be deducted due to work delays caused by malfunctions.

第三，问清报价含不含操作手、柴油、刀头磨损、进出场费。只报裸机日租的，后期加一项扣一项，总价反而非常贵。

Thirdly, inquire whether the quotation includes operator, diesel, blade wear, and entry and exit fees. For those who only report bare machine daily rental, adding one item and deducting one item later will result in the highest total price.

第四，进场先拍转子刀头磨损照。刀头秃了拌出来粗细离析，基层强度直接不达标，这笔账别等钻芯失败再算。

Fourthly, take photos of the wear of the rotor blade before entering the site. If the blade is bald and mixed with coarse and fine segregation, and the strength of the base layer does not meet the standard directly, this account will not be calculated until the core drilling fails.

把“机型匹配深度、水泥按试验走、初凝前压完、合同写死参数”这四句记在采购单上，旧路改造既能省料，又不给面层留反射裂缝的隐患。

Record the four sentences of "matching depth of model, cement according to test, pressing before initial setting, and writing fixed parameters in the contract" on the purchase order. The renovation of old roads can save materials and avoid the hidden danger of reflection cracks on the surface layer.