水泥就地冷再生基层施工工艺标准

　　Construction process standard for on-site cold recycling base of cement

　　1适用范围水泥就地冷再生基层适用于改建的各级半刚性路面结构，一般位于沥青混凝土面层下。

　　1 Scope of application: Cement in-situ cold recycling base is suitable for the reconstruction of various levels of semi-rigid pavement structures, generally located under the asphalt concrete surface layer.

　　2规范性引用文件2.1《公路路面基层施工技术规范》（JTJ034-2000）。2.2《城镇道路工程施工与质量验收规范》（CJJ1-2008）2.3《公路工程无机结合料稳定材料试验规程》（JTJ057）。

　　2. Normative reference document 2.1 "Technical Specification for Construction of Highway Pavement Base" (JTJ034-2000). 2.2 "Code for Construction and Quality Acceptance of Urban Road Engineering" (CJJ1-2008) 2.3 "Test Specification for Inorganic Bonding Material Stability in Highway Engineering" (JTJ057).

　　3术 语3.1水泥就地冷再生基层cementcold in placerecycling base在原有路基上加水泥，用冷再生机拌合而成的基层3.2主控项目dominant item城镇道路工程中的对质量、安全、卫生、环境保护和公众利益起决定性作用的检验项目。3.3一般项目general item除主控项目以外的检验项目。3.4抽样检验sampling inspection按照规定的抽样方案，从进场的材料、构配件、设备或城镇道路工程检验项目中抽取一定数量的样本所进行的检验。

　　3 Terminology 3.1 Cement cold in place recycling base is a base layer made by adding cement to the original roadbed and mixing it with a cold recycling machine. 3.2 Main control items are inspection items that play a decisive role in quality, safety, hygiene, environmental protection, and public interest in urban road engineering. 3.3 General items refer to inspection items other than the main control items. 3.4 Sampling inspection refers to the inspection conducted by selecting a certain number of samples from the materials, components, equipment, or urban road engineering inspection items that enter the site according to the prescribed sampling plan.

　　4施工准备Ⅰ技术准备4.1集中技术人员进行图纸会审，熟悉各部结构，确定合理的施工工艺。4.2对全线的导线点、水准点进行加密、复测，精度符合规范要求。4.3选定料场，进行配合比试验，并进行优化设计，确定合理的配合比。4.4详细了解现场施工环境，编制切实可行的施工方案，并详细进行二级技术交底。4.5做好安全防卫和安全技术交底工作，避免天气、施工机械等对生产人员的生命财产构成威胁。4.6对下承层进行验收，必须在其满足规范要求后才能进行下道工序。4.7量放样，直线（或大半径圆曲线）段每10m放一中桩、边桩，小半径曲线处（匝道）每5m放一中、边桩，测量其高程并计算其要求调整的高度，作为钢丝基准线的标准。Ⅱ物资准备4.8水泥应符合下列规定

　　4 Construction Preparation I Technical Preparation 4.1 Centralized technical personnel conduct drawing review, familiarize themselves with various structures, and determine reasonable construction processes. 4.2 Encrypt and retest the traverse points and benchmark points along the entire line, ensuring accuracy meets regulatory requirements. 4.3 Select the material yard, conduct mix proportion tests, and optimize the design to determine a reasonable mix proportion. 4.4 Detailed understanding of the on-site construction environment, preparation of practical and feasible construction plans, and detailed secondary technical disclosure. 4.5 Carry out safety defense and safety technical disclosure work to avoid threats to the lives and property of production personnel caused by weather, construction machinery, etc. 4.6 Acceptance of the underlying layer must be carried out only after it meets the specification requirements before proceeding to the next process. 4.7 Quantity layout, place one center stake and edge stake every 10 meters on straight (or large radius circular curve) sections, and place one center stake and edge stake every 5 meters on small radius curves (ramps). Measure their elevation and calculate the required adjustment height as the standard for the steel wire reference line. II Material Preparation 4.8 Cement should comply with the following regulations

　　1水泥宜采用硅酸盐水泥或普通硅酸盐水泥，水泥强度等级不应低于32.5MPa。2水泥进场应有产品合格证和出场检验报告，进场后应对强度、安定性及其他必要的性能指标进行取样复试。其质量必须符合现行国家标准《硅酸盐水泥、普通硅酸盐水泥》GB175等的规定。3 不同等级、厂牌、品种、出厂日期的水泥不得混存、混用。出厂期超过三个月或受潮的水泥，必须经过试验，按其实验结果决定正常使用或降级使用。已经结块变质的水泥不得使用。不同品种的水泥不得混合使用。

　　1. Portland cement or ordinary Portland cement should be used for cement, and the strength grade of cement should not be lower than 32.5MPa. Cement entering the site should have a product qualification certificate and an exit inspection report. After entering the site, samples should be taken for retesting of strength, stability, and other necessary performance indicators. Its quality must comply with the current national standards such as GB175 for Portland Cement and Ordinary Portland Cement. Cement of different grades, brands, varieties, and production dates shall not be stored or mixed together. Cement that has been out of the factory for more than three months or has been affected by moisture must undergo testing, and its normal or downgraded use shall be determined based on the test results. Cement that has already clumped and deteriorated shall not be used. Different types of cement shall not be mixed for use.

　　4.9水：宜采用饮用水。当采用其他水源时，其水质应符合国家现行标准《混凝土拌合用水标准》JGJ 63的规定。Ⅲ　施工设备准备4.10施工设备：冷拌再生机1台，洒水车3～4台，50t振动压路机1台，18t～21 t光轮压路机2台，平路机1台。

　　4.9 Water: It is advisable to use drinking water. When using other water sources, their water quality should comply with the current national standard "Standard for Water Used in Concrete Mixing" JGJ 63. III. Preparation of Construction Equipment 4.10 Construction Equipment: 1 cold mix recycling machine, 3-4 sprinkler trucks, 1 50t vibratory roller, 2 18t~21t smooth wheel rollers, and 1 leveling machine.

　　4.11测量器具：全站仪、水准仪等。　Ⅳ　作业条件准备4.12完成下承层处理与验收。检测项目包括：纵断高程、中线偏差、横坡、边坡、压实度、弯沉、平整度等。监理工程师签认批准。

　　4.11 Measuring instruments: total station, level, etc. Preparation of homework conditions 4.12: Complete the treatment and acceptance of the underlying layer. The testing items include: longitudinal elevation, centerline deviation, cross slope, side slope, compaction degree, deflection, flatness, etc. The supervising engineer signs and approves.

　　4.13在正式开工之前，已进行试验段施工，获得了机械拌和、摊铺、压实等技术参数（松铺系数、碾压遍数、摊铺速度等)。

　　Before the official start of construction, the trial section construction has been carried out, and technical parameters such as mechanical mixing, paving, and compaction have been obtained (loose paving coefficient, number of rolling passes, paving speed, etc.).

　　5　施工工艺Ⅰ施工工艺流程5.1施工工艺流程应符合图1.5.1-1的规定。图1.5.1-1工艺流程图

　　5 Construction Process I Construction Process 5.1 The construction process should comply with the provisions of Figure 1.5.1-1. Figure 1.5.1-1 Process Flow Diagram

　　Ⅱ操作工艺

　　II Operation Process

　　5.2旧路面混合料分析通过对旧路结构的现场调查，对旧路结构层厚度不足路段，应加铺砂砾以保证再生层厚度。冷再生机现场破碎未掺加水泥的旧路面，由试验人员就地均衡取料，通过对拌和料的筛分及多次击实试验，确定粒料的最大干密度、最佳含水量。进行无侧限抗压强度试验确定掺加的水泥剂量。

　　5.2 Analysis of Old Road Surface Mixture: Through on-site investigation of the old road structure, for sections where the thickness of the old road structure layer is insufficient, gravel should be added to ensure the thickness of the recycled layer. The cold recycling machine crushes the old road surface without adding cement on site, and the test personnel evenly take the materials on site. Through screening and multiple compaction tests of the mixed materials, the maximum dry density and optimal moisture content of the aggregates are determined. Conduct unconfined compressive strength tests to determine the amount of cement to be added.

　　5.3水泥摊铺在纵向每隔10m放出施工控制线钉上钢筋桩并挂线，利于冷再生机边线控制，经室内试验确定冷再生底基层水泥用量为4％，施工过程中按5％控制。摊铺水泥前按路线前进方向每10m为一格，计算出每一格水泥用量，然后人工按每格摊铺几袋水泥，将水泥均匀布满方格，确保水泥布撒均匀、一致、等厚。原有路缘石待路面冷再生碾压成型后再拆除。

　　5.3 Cement paving: Construction control lines are set out every 10 meters longitudinally, and steel piles are nailed and hung to facilitate the control of the cold recycling machine edge. After indoor testing, it was determined that the cement dosage for the cold recycling base layer is 4%, and during the construction process, it is controlled at 5%. Before laying cement, every 10m in the direction of the route, calculate the amount of cement used for each grid. Then, manually lay several bags of cement per grid, evenly distribute the cement throughout the grid, and ensure that the cement is evenly, uniformly, and of equal thickness. The original curbstones will be removed after the road surface is cold recycled and compacted into shape.

　　5.4旧路面再生破碎拌和

　　5.4 Recycling, crushing and mixing of old road surfaces

　　1冷再生段采用等厚法施工，按全路宽12 m计算，考虑到半幅施工的搭接问题，所以在第一次半幅施工时，加宽50 cm进行施工，利于另半幅冷再生的搭接施工。冷再生机一次破碎宽度为2.5 m，半幅路面以行进3次完成。工作时，冷再生机需一辆洒水车紧跟作业，其余2～3辆洒水车配合保证拌和用水，拌和过程中按试验的最佳含水量控制加水，拌和行进速度7m／min～10m／min。

　　The cold recycling section adopts the equal thickness method for construction, calculated based on a total road width of 12 meters. Considering the overlapping problem of half width construction, a widening of 50 cm was carried out during the first half width construction to facilitate the overlapping construction of the other half width cold recycling. The crushing width of the cold recycling machine is 2.5 meters, and half of the road surface is completed by traveling three times. During operation, the cold recycling machine requires one sprinkler truck to closely follow the operation, and the other 2-3 sprinkler trucks to cooperate to ensure the use of mixing water. During the mixing process, water should be added according to the optimal water content of the test, and the mixing speed should be 7m/min to 10m/min.

　　2考虑到水泥的初凝时间，以及各道工序的衔接问题，以100m实施工长度为限，当冷再生机单幅破碎100m后，返回准备第二幅进行的当中，对刚完成的100m进行稳压，然后平地机进行刮平,501振动压路面进行振动压实，直至达到规定的压实度，平整度按规范要求控制。

　　Considering the initial setting time of cement and the connection issues of each process, the construction length is limited to 100m. After the cold recycling machine crushes 100m in a single section, it returns to the middle of preparing for the second section to stabilize the just completed 100m. Then, the grader is used for leveling, and the 501 vibration compactor is used for vibration compaction of the road surface until the specified compaction degree is achieved. The flatness is controlled according to the specifications.

　　5.5再生层整形半幅路段拌和完毕后，先用50 t振动压路机稳压2～3遍后。用平地机初步整平，测量人员根据设计纵断高程和横坡度，每10m为一断面分左中右3个点测出高程，按1.05-1.1的松铺系数，人工找出基准点，高程不足时及时调节富裕路段材料，高出段及时用平地机刮平。通过旧路整形达到“调坡”、“调拱”的目的，且保证平整度满足设计要求。要求整平精度要高。确保平整度和纵断面高程、横坡度符合设计。施工中。按“宁刮勿补”的原则，严禁“薄层找补”。若找补厚度过薄，找补前先将稳压后的局部低洼处用齿耙将表层5 cm耙松，再行找补。确保碾压成型一致，不起皮、不松散、无离析现象。

　　After mixing the half width section of the 5.5 regeneration layer shaping, first use a 50 ton vibratory roller to stabilize the pressure for 2-3 times. Preliminarily level with a grader, and the surveyors measure the elevation at three points on the left, middle, right, and right sides of a section every 10 meters based on the designed longitudinal elevation and cross slope. Using a loose paving coefficient of 1.05-1.1, manually find the reference point. If the elevation is insufficient, adjust the material of the surplus section in a timely manner, and use a grader to level the elevated section in a timely manner. By reshaping the old road, the purpose of "slope adjustment" and "arch adjustment" can be achieved, while ensuring that the flatness meets the design requirements. High leveling accuracy is required. Ensure that the flatness, longitudinal elevation, and cross slope comply with the design. During construction. According to the principle of "better scraping than repairing", it is strictly prohibited to "repair thin layers". If the thickness of the repair is too thin, first loosen the surface 5 cm of the locally low-lying area after stabilizing with a toothed rake before repairing. Ensure consistent compaction molding, without peeling, looseness, or segregation.

　　5.6再生层碾压

　　5.6 Regeneration layer compaction

　　1 再生层整形完成及时碾压，检测含水量必须等于或略大于最佳含量。整形后检测各项标高符合设计要求，碾压顺序为用振动压路机振压3遍，18 t～21 t光轮压路机静压1～2遍，表面要保证平整、湿润。碾压后外观平整，无明显轮迹，检测压实度达到规范要求。

　　1. After the completion of the regeneration layer shaping, it should be rolled in a timely manner, and the moisture content detected must be equal to or slightly higher than the optimal content. After plastic surgery, all elevations are checked to meet the design requirements. The rolling sequence is to use a vibratory roller for 3 times of vibration, and an 18 ton to 21 ton smooth wheel roller for 1-2 times of static pressure. The surface should be ensured to be smooth and moist. After compaction, the appearance is smooth without obvious wheel marks, and the compaction degree meets the standard requirements.

　　2 使用50 t双幅/双频振动压路机的时，要确保：初压时使用高幅，低频振动模式，这将保证整个深度内具有良好的压实。复压采用低幅／高频，这将保证对铺层上部的良好压实。

　　When using a 50 ton double amplitude/dual frequency vibratory roller, it is important to ensure that high amplitude and low frequency vibration modes are used during initial compaction to ensure good compaction throughout the entire depth. The re compaction adopts low amplitude/high frequency, which will ensure good compaction of the upper part of the paving layer.

　　5.7再生层养生碾压检测合格后及时洒水养生，养生期内中断所有交通，杜绝洒水车以外的任何车辆进入，养生期不少于7 d，要使冷再生基层表面始终保持湿润，做到每天及时洒水，专人看管，确保再生层不因洒水养生不当产生损坏。

　　5.7 After passing the maintenance and compaction test of the regeneration layer, water should be sprayed for maintenance in a timely manner. During the maintenance period, all traffic should be interrupted, and any vehicles other than sprinkler trucks should be prohibited from entering. The maintenance period should not be less than 7 days, and the surface of the cold regeneration base should be kept moist at all times. Water should be sprayed in a timely manner every day, and a dedicated person should supervise to ensure that the regeneration layer is not damaged due to improper watering and maintenance.

　　Ⅲ季节性施工

　　III. Seasonal Construction

　　5.8水泥就地冷再生基层施工期的最低气温为5℃，并在第一次冰冻到来之前半个月到一个月完成水稳基层施工，否则应有妥善的保温措施。

　　The minimum temperature during the construction period of the cement in-situ cold recycling base layer is 5 ℃, and the water stable base layer construction should be completed half a month to a month before the first freezing, otherwise proper insulation measures should be taken.

　　5.9将所有的场内机电设备进行检查，检查其防潮及绝缘设施，防止雨季因设备影响施工，在雨季前及下雨时对机电设备施加覆盖及防潮篷布。

　　5.9 Inspect all on-site mechanical and electrical equipment, check their moisture-proof and insulation facilities to prevent construction from being affected by equipment during the rainy season. Cover and moisture-proof tarpaulins should be applied to the mechanical and electrical equipment before and during the rainy season.

　　5.10雨季来临时会对地材供应造成很大的影响，因此在雨季来临前做好地材的备料，以免因料不足影响施工。6质量标准6.1主控项目应符合下列规定：

　　When the rainy season arrives, it will have a significant impact on the supply of ground materials. Therefore, it is necessary to prepare ground materials before the rainy season to avoid the impact of insufficient materials on construction. 6 Quality Standards 6.1 The main control items shall comply with the following regulations:

　　1原材料质量应符合下列规定1）水泥品种、级别、质量、包装、贮存，应符合国家现行有关标准的规定。检查数量：按同一生产厂家、同一等级、同一品种、同一批号且连续进场的水泥，袋装水泥不超过200t为一批，散装水泥不超过500t为一批，每批抽样一次。水泥出厂超过三个月（快硬硅酸盐水泥超过一个月）时，应进行复验，复验合格后方可使用。检验方法：检查产品合格证、出厂检验报告，进场复验。

　　The quality of raw materials should comply with the following regulations: 1) The type, grade, quality, packaging, and storage of cement should comply with the relevant national standards currently in effect. Inspection quantity: Cement from the same manufacturer, grade, variety, batch number, and continuous entry, with bagged cement not exceeding 200 tons per batch and bulk cement not exceeding 500 tons per batch, shall be sampled once per batch. When the cement has been out of the factory for more than three months (fast hardening Portland cement for more than one month), it should be retested and can only be used after passing the retest. Inspection method: Check the product qualification certificate, factory inspection report, and conduct on-site re inspection.

　　2基层、底基层的压实度应符合下列要求：1）城市快速路、主干路基层大于或等于97%，底基层大于或等于95%。2）其他等级道路基层大于或等于95%，底基层大于或等于93%。检查数量：每1000m2，每压实层抽检1点。检验方法：环刀法、灌砂法或灌水法。

　　The compaction degree of the base layer and sub base layer should meet the following requirements: 1) The base layer of urban expressways and main roads should be greater than or equal to 97%, and the sub base layer should be greater than or equal to 95%. 2) The base layer of other grades of roads is greater than or equal to 95%, and the sub base layer is greater than or equal to 93%. Inspection quantity: 1 point per 1000m2 of compacted layer. Inspection methods: ring knife method, sand filling method, or water filling method.

　　3 基层、底基层试件作7d无侧限抗压强度，应符合设计要求：检查数量：每2000m2抽检1组。检验方法：现场取样试验。6.2一般项目应符合下列要求：

　　The 7-day unconfined compressive strength of the 3 base and sub base specimens should meet the design requirements: inspection quantity: 1 set is randomly inspected every 2000m2. Inspection method: On site sampling test. 6.2 General projects should meet the following requirements:

　　1 表面应平整、坚实、无粗细骨料集中现象，无明显轮迹、推移、裂缝，接茬平顺，无贴皮、散料。2 基层及底基层允许偏差应符合表1.6.2-1的规定。

　　The surface should be flat, solid, without concentrated coarse and fine aggregates, without obvious wheel marks, displacement, cracks, smooth joints, and no sticking or loose materials. The allowable deviation for the base and sub base shall comply with the provisions of Table 1.6.2-1.