案例公路為一級標(biāo)準(zhǔn)公路，雙向四車道，總長16.08 km。原為混凝土路面，經(jīng)過一段時間的使用后，部分路面出現(xiàn)裂縫、車轍、坑洼等病害，并且面層結(jié)構(gòu)毀壞嚴(yán)重。維修養(yǎng)護(hù)工程中，應(yīng)用了泡沫瀝青原地冷再生技術(shù)，即：刨銑原瀝青面層，刨銑后給予原基礎(chǔ)層以水泥穩(wěn)定工藝處理，再將刨銑所獲得的舊瀝青材料進(jìn)行再泡處理，用于新面層鋪筑，構(gòu)成再生柔性面層。該冷再生技術(shù)，不僅提高面層強(qiáng)度和抗疲勞性，還一定程度克服了半剛性面層的反射裂隙問題。

　　The case highway is a first-class standard highway with four lanes in both directions, with a total length of 16.08 km. Originally made of concrete pavement, after a period of use, some parts of the pavement have developed cracks, ruts, potholes and other defects, and the surface structure has been severely damaged. In the maintenance project, the in-situ cold recycling technology of foam asphalt is applied, that is, the original asphalt surface is planed and milled, and the original foundation layer is treated with cement stabilization process after milling, and then the old asphalt materials obtained from milling are recycled and foamed for the paving of new surface layer to form a regenerated flexible surface layer. This cold regeneration technology not only improves the strength and fatigue resistance of the surface layer, but also overcomes the problem of reflection cracks in semi-rigid surface layers to a certain extent.

　　水泥對泡沫瀝青原地冷再生復(fù)合料有多種作用。水泥會降低再生復(fù)合料彈性，增加再生復(fù)合料的收縮率，提高再生料穩(wěn)定性，增強(qiáng)再生料的強(qiáng)度和耐疲勞功效。施工時，應(yīng)依據(jù)刨銑舊料的功效狀態(tài)和不同車道的功效要求，來確定新復(fù)合料中的水泥用量。通常狀態(tài)下，在原瀝青刨銑料的附著力不足或車流量大的路面，可適當(dāng)增加水泥用量，但是不宜大于2.5%。

　　Cement has many effects on foam asphalt in-situ cold recycling composite. Cement can reduce the elasticity of recycled composite materials, increase their shrinkage rate, improve their stability, and enhance their strength and fatigue resistance. During construction, the amount of cement used in the new composite material should be determined based on the functional status of the milled old material and the functional requirements of different lanes. Under normal circumstances, on roads with insufficient adhesion of the original asphalt milling material or high traffic volume, the amount of cement used can be appropriately increased, but should not exceed 2.5%.

　　不同區(qū)段的刨銑料級配差異很大。復(fù)合料中小于0.075 mm的顆粒劑量，對泡沫瀝青再生復(fù)合料的功效有顯著影響。劑量過低時，再生料的抗疲勞、抗水損、抗拉和抗壓功效較差。因此，為了充分發(fā)揮再生復(fù)合料的良好功效，需要依據(jù)原路面的實(shí)際狀態(tài)，開展分段設(shè)計(jì)，依據(jù)需求加添新骨料，使再生復(fù)合料有較好級配，限度地提高再生復(fù)合料質(zhì)量。

　　The grading of milling materials varies greatly in different sections. The dosage of particles less than 0.075 mm in the composite has a significant impact on the efficacy of foam asphalt recycled composite. When the dosage is too low, the anti fatigue, anti water damage, tensile and compressive effects of recycled materials are poor. Therefore, in order to fully utilize the good effects of recycled composite materials, it is necessary to carry out segmented design based on the actual state of the original road surface, add new aggregates according to demand, so that the recycled composite materials have a better gradation and maximize the quality of the recycled composite materials.

　　受區(qū)域氣候條件、原路面病害、原路基含水量的影響，不同區(qū)段的刨銑料，其含水量也不同。含水量影響復(fù)合料摻拌均勻性，進(jìn)而影響再生復(fù)合料的功效。應(yīng)依據(jù)不同路段刨銑料的含水量，確定泡沫瀝青再生復(fù)合料的加水量，使再生料的含水量控制在80%左右。如果雨后的刨銑料含水量高出合適的摻拌用水量，不可以立即施工。而應(yīng)在空氣中自然晾干，待含水量降低到一定程度之后，才可以施工。

　　Due to the influence of regional climate conditions, original road surface diseases, and original roadbed moisture content, the moisture content of milling materials in different sections also varies. The moisture content affects the uniformity of composite material mixing, which in turn affects the effectiveness of recycled composite materials. The water content of foam asphalt recycled composite shall be determined according to the water content of planed and milled materials in different sections, so as to control the water content of recycled materials at about 80%. If the moisture content of the milling material after rain is higher than the appropriate mixing water, construction cannot be carried out immediately. And it should be naturally dried in the air until the moisture content drops to a certain level before construction can begin.

　　泡沫瀝青的發(fā)泡特性，影響泡沫瀝青復(fù)合料的骨料與瀝青的混合均勻度，從而影響復(fù)合料的路用功效。如果半衰期過短，就會不利于瀝青在復(fù)合料中的均勻分散。如果膨脹率過低，就會使瀝青黏度大，易與骨料結(jié)塊，不能與骨料混合均勻。因此，為確保再生復(fù)合料的質(zhì)量，泡沫瀝青的半衰期和膨脹率，應(yīng)分別滿足不低于8倍和不低于10倍的要求。影響瀝青發(fā)泡的因素有很多，包括瀝青溫度、瀝青種類和耗水量等。

　　The foaming characteristics of foam asphalt affect the mixing uniformity of aggregate and asphalt of foam asphalt composite, thus affecting the road use efficiency of the composite. If the half-life is too short, it will be detrimental to the uniform dispersion of asphalt in the composite material. If the expansion rate is too low, it will cause the viscosity of the asphalt to be high, making it easy to clump with the aggregate and unable to mix evenly with it. Therefore, in order to ensure the quality of recycled composite, the half-life and expansion rate of foam asphalt should meet the requirements of not less than 8 times and not less than 10 times respectively. There are many factors that affect asphalt foaming, including asphalt temperature, asphalt type, and water consumption.

　　一般刨銑舊料中的細(xì)料含量均相對較低，未經(jīng)補(bǔ)量調(diào)配，不會符合新復(fù)合料的級配需求。比如案例刨銑料的篩選分析顯示，其0.075 mm組分含量僅為2.0%,要滿足再生復(fù)合料級配技術(shù)需求，就需要添加一些細(xì)料來滿足級配。加添細(xì)料的種類和比例，應(yīng)通過實(shí)驗(yàn)給予確定。案例工程基于2種級配方案開展級配實(shí)驗(yàn)，即1.5%水泥+18.5%石屑+80%刨銑料(A組);1.5%水泥+8.5%石屑+90%刨銑料(B組)。試驗(yàn)結(jié)果揭示，當(dāng)泡沫瀝青分別采取2%、2.5%、3%和3.5%劑量時，方案B的干濕性能優(yōu)于方案A,而且泡沫瀝青含量2.5%時，為泡沫瀝青再生復(fù)合料方案。所以案例工程的泡沫瀝青級配優(yōu)化方案為1.5%水泥+8.5%石屑+90%刨銑料+2.5%泡沫瀝青含量。

　　The fine material content in general milling old materials is relatively low, and without supplementary blending, it will not meet the grading requirements of new composite materials. For example, the screening analysis of the case milling material shows that its 0.075mm component content is only 2.0%. To meet the grading technology requirements of recycled composite materials, some fine materials need to be added to meet the grading. The type and proportion of fine materials added should be determined through experiments. The case project conducted grading experiments based on two grading schemes, namely 1.5% cement+18.5% stone chips+80% milling material (Group A); 1.5% cement+8.5% stone chips+90% milling material (Group B). The test results reveal that when the dosage of foam asphalt is 2%, 2.5%, 3% and 3.5% respectively, the dry and wet performance of Scheme B is better than that of Scheme A. Moreover, when the content of foam asphalt is 2.5%, it is the optimal scheme of foam asphalt recycling composite. Therefore, the foam asphalt grading optimization scheme of the case project is 1.5% cement+8.5% stone chips+90% planed and milled material+2.5% foam asphalt content.

　　對水泥、瀝青、摻拌用水、新骨料等材料的來源和質(zhì)量開展檢測分析。不得使用不滿足質(zhì)量要求的材料。核查泡沫瀝青的溫度功效，溫度不能過低，否則會影響瀝青的發(fā)泡功效，從而影響了工程質(zhì)量。

　　Conduct testing and analysis on the sources and quality of materials such as cement, asphalt, mixing water, and new aggregates. Materials that do not meet quality requirements shall not be used. Check the temperature effect of foam asphalt. The temperature cannot be too low, or it will affect the foaming effect of asphalt, thus affecting the project quality.

　　泡沫瀝青原地冷再生工程機(jī)械，一般由冷再生機(jī)組、水罐車、水泥漿車、熱瀝青罐車、壓路機(jī)等構(gòu)成，工前檢查相關(guān)裝備和功效狀態(tài)，以保證裝備齊全，技術(shù)狀態(tài)良好。

　　Foam asphalt in situ cold recycling engineering machinery is generally composed of cold recycling units, water tankers, slurry trucks, hot asphalt tankers, road rollers, etc. Check the relevant equipment and efficacy status before construction to ensure that the equipment is complete and the technology is in good condition.

　　泡沫瀝青原地冷再生厚度，通常在16.0 cm左右。為了使再生層具有良好基礎(chǔ)，充分發(fā)揮的路用功效，要求下承重層具有良好的整體性，并滿足結(jié)構(gòu)層的功效要求。因此在再生施工前，對下承載層的強(qiáng)度不足的區(qū)域，應(yīng)給予補(bǔ)強(qiáng)處理。對刨銑后的舊路面可能存在的裂隙、松散、凹坑等病害，給予處理。還要對舊路面進(jìn)行清理，不可有油污或雜物。還要與交通管理部門溝通，協(xié)調(diào)安排好施工區(qū)段臨時關(guān)閉交通。

　　The thickness of foam asphalt in situ cold regeneration is usually about 16.0 cm. In order to provide a good foundation for the regeneration layer and fully utilize its excellent road performance, it is required that the lower load-bearing layer has good integrity and meets the functional requirements of the structural layer. Therefore, before the regeneration construction, areas with insufficient strength of the lower bearing layer should be reinforced. Treat the cracks, looseness, potholes and other defects that may exist on the milled old road surface. The old road surface should also be cleaned and free of oil stains or debris. We also need to communicate with the traffic management department to coordinate and arrange for the temporary closure of traffic in the construction area.

　　再生機(jī)的作業(yè)行進(jìn)速率，不僅影響作業(yè)效率，而且對刨銑料的質(zhì)量也有顯著影響。作業(yè)行進(jìn)速率越慢，級配越細(xì)，越快，級配越粗。尤其是在水害或開裂嚴(yán)重的區(qū)段，如果運(yùn)行速率較快，刨銑料中會存在相當(dāng)數(shù)量的塊體破碎不充分，從而影響再生復(fù)合料質(zhì)量。作業(yè)行進(jìn)速率不均勻，再生復(fù)合料的級配，就會發(fā)生比較大的分散性。刨銑機(jī)的作業(yè)行進(jìn)速率，一般應(yīng)控制在3～8 m/min區(qū)間。

　　The operating speed of the recycling machine not only affects the efficiency of the operation, but also has a significant impact on the quality of the milling material. The slower the progress speed of the homework, the finer the grading, the faster the grading, and the coarser the grading. Especially in sections with severe water damage or cracking, if the operating speed is fast, there will be a considerable number of insufficiently broken blocks in the milling material, which will affect the quality of the recycled composite material. Uneven progress rate of homework can lead to significant dispersion in the grading of recycled composite materials. The operating speed of the milling machine should generally be controlled within the range of 3-8 m/min.

　　施工實(shí)踐發(fā)現(xiàn)，罐車內(nèi)瀝青溫度過低，往往會影響瀝青發(fā)泡功效，進(jìn)而影響再生復(fù)合料的路用功效。因此，每次更換罐車前，一定要檢查罐車溫度，實(shí)時監(jiān)測瀝青發(fā)泡功效。

　　Construction practice has found that the low temperature of asphalt in tank trucks often affects the foaming effect of asphalt, which in turn affects the road performance of recycled composite materials. Therefore, before replacing the tanker, it is necessary to check the temperature of the tanker and monitor the asphalt foaming effect in real time.

　　不同路段的刨銑料的水分含量有所不同，為盡量控制加水量差異對再生復(fù)合料功效的不利影響，在施工操作中，應(yīng)每刨銑一段距離，對應(yīng)開展一次含水量測試，以調(diào)節(jié)攪拌加水量。攪拌溫度是指攪拌過程中骨料的溫度。攪拌溫度對泡沫瀝青的分散功效存在影響。如果攪拌溫度太低，泡沫瀝青在遇到骨料后會立刻冷卻，造成衰變過快，不利于復(fù)合料中泡沫瀝青的分散。試驗(yàn)研究顯示，原地冷再生施工的作業(yè)溫度，不宜低于10 ℃。

　　The moisture content of milling materials varies in different road sections. In order to minimize the adverse effects of differences in water addition on the effectiveness of recycled composite materials, a moisture content test should be conducted for each milling distance during construction operations to adjust the mixing and water addition. Mixing temperature refers to the temperature of the aggregate during the mixing process. The mixing temperature has an effect on the dispersion efficiency of foam asphalt. If the mixing temperature is too low, the foam asphalt will cool immediately after encountering the aggregate, resulting in too fast decay, which is not conducive to the dispersion of foam asphalt in the composite. Experimental studies have shown that the operating temperature for in-situ cold recycling construction should not be lower than 10 ℃.

　　壓密對于原地冷再生復(fù)合料的強(qiáng)度實(shí)現(xiàn)非常重要。因此施工中，一定要合理應(yīng)用壓密機(jī)械并提供合理的壓密操作。一般應(yīng)配備1臺12 t雙鋼輪壓道機(jī)，1臺25 t振動鋼輪，1臺16 t振動單鋼輪壓道機(jī)。具體壓密過程如下：①初壓。為了確保再生復(fù)合料壓密度，原地冷再生應(yīng)采取流水工藝。待再生機(jī)運(yùn)行完畢后，立刻使用雙光輪壓道機(jī)，以1.5～3.0 km/h的壓碾速率，進(jìn)行靜壓1次。②復(fù)壓。為了有效壓密再生復(fù)合料整體結(jié)構(gòu)層，選擇重型壓道機(jī)。先采取高振幅低頻方式壓碾；然后，采取高頻低振幅壓碾；壓碾速率應(yīng)控制在2～4 km/h。③終壓。應(yīng)用輪胎壓道機(jī)開展壓碾，速率應(yīng)為2～4 km/h; 如果有輪痕，應(yīng)使用光輪壓道機(jī)再次壓碾一遍收光。盡管增加壓密度有利于增強(qiáng)再生層的路用功效，但是要注意不要過度壓碾，以免發(fā)生起皮、彈簧現(xiàn)象。如果出現(xiàn)這些質(zhì)量問題，再生層需要重新翻拌壓碾。

　　Compaction is crucial for achieving the strength of in-situ cold recycled composite materials. Therefore, during construction, it is necessary to use compaction machinery reasonably and provide reasonable compaction operations. Generally, one 12 ton double steel wheel compactor, one 25 ton vibrating steel wheel, and one 16 ton vibrating single steel wheel compactor should be equipped. The specific compaction process is as follows: ① Initial compaction. In order to ensure the compressive density of the recycled composite material, in-situ cold regeneration should adopt a flow process. After the regeneration machine is completed, immediately use a dual wheel roller to perform static pressure once at a rolling speed of 1.5-3.0 km/h. ② Re pressing. In order to effectively compact the overall structural layer of the recycled composite material, a heavy-duty compactor is selected. Firstly, adopt a high amplitude and low frequency rolling method; Then, high-frequency low amplitude rolling is adopted; The rolling speed should be controlled between 2-4 km/h. ③ Final pressure. Use a tire roller to carry out rolling, with a speed of 2-4 km/h; If there are wheel marks, a smooth wheel roller should be used to press and polish again. Although increasing the compaction density is beneficial for enhancing the road performance of the regeneration layer, it is important to avoid excessive compaction to prevent peeling and spring phenomenon. If these quality problems occur, the regeneration layer needs to be re mixed, pressed and rolled.

　　當(dāng)再生機(jī)每次停止工作時，均可能發(fā)生一個橫向接縫。因此，在施工中，應(yīng)盡可能控制再生機(jī)停機(jī)頻次，避免過多出現(xiàn)橫向斷帶現(xiàn)象。再生機(jī)的噴油速率由機(jī)帶微處理器自動控制，當(dāng)再生機(jī)運(yùn)行緩慢時，噴油速率則會降低。當(dāng)再生機(jī)啟動或停止時，因?yàn)檫@時的行進(jìn)速率相對慢，噴壓一般會降低到無法有效噴射泡沫瀝青的程度，進(jìn)而影響再生層功效。為了解決此問題，較為常見的做法為：再生機(jī)在橫向接縫處，后退一個轉(zhuǎn)子距離，約1.5 m左右，然后全速啟動前進(jìn)，達(dá)到正常施工速率，完成橫向接縫處的作業(yè)和質(zhì)量銜接。對于縱方向接縫，可采用下述方法處理：不同工作面之間應(yīng)設(shè)置不小于15 cm的搭接寬度，搭接寬度應(yīng)依據(jù)再生層的厚度、刨銑料性質(zhì)，以及相鄰工作面之間的時段間隔給予確定。同時，為防止搭接處泡沫瀝青、水泥和水的添加不合理，應(yīng)在轉(zhuǎn)子寬度中扣除搭接寬度，作為再生作業(yè)寬度，以確保再生路面質(zhì)量。

　　Every time the regeneration machine stops working, a transverse seam may occur. Therefore, during construction, the frequency of shutdown of the regeneration machine should be controlled as much as possible to avoid excessive occurrence of horizontal belt breakage. The fuel injection rate of the regeneration machine is automatically controlled by the built-in microprocessor. When the regeneration machine runs slowly, the fuel injection rate will decrease. When the regenerator is started or stopped, because the traveling speed is relatively slow at this time, the spray pressure will generally be reduced to the extent that it is unable to effectively spray foam asphalt, thus affecting the efficacy of the regeneration layer. To solve this problem, a common approach is to retract the regeneration machine by a rotor distance of about 1.5 meters at the transverse joint, and then start it at full speed to reach the normal construction speed, completing the operation and quality connection at the transverse joint. For longitudinal joints, the following method can be used: a lap width of not less than 15 cm should be set between different working faces, and the lap width should be determined based on the thickness of the recycled layer, the properties of the milling material, and the time interval between adjacent working faces. At the same time, in order to prevent unreasonable addition of foam asphalt, cement and water at the lap joint, the lap joint width should be deducted from the rotor width as the width of recycling operation to ensure the quality of recycled pavement.

　　與水泥再生復(fù)合料不同，泡沫瀝青再生復(fù)合料，采取自然養(yǎng)生方式，通常無需采用其他輔助措施。再生復(fù)合料壓碾完成1 d以后，可開放交通進(jìn)行養(yǎng)生，但是要嚴(yán)禁重型車輛壓碾，養(yǎng)生期間的車輛行駛速率，應(yīng)低于40 km/h, 并且嚴(yán)禁車輛急剎車，也要禁止車輛在養(yǎng)生期間的路面上掉頭。泡沫瀝青再生復(fù)合料路面在滿足如下條件之一：養(yǎng)生時間不小于7 d、含水量低于2%、可取出完整的芯樣，即可完成養(yǎng)生。一般水泥穩(wěn)定碎石泡沫瀝青再生復(fù)合料，在晴天自然養(yǎng)生3 d后，即可取出完整的芯樣。

　　Different from the cement recycled composite, the foam asphalt recycled composite adopts the natural curing method, and usually does not need other auxiliary measures. After 1 day of compaction of recycled composite materials, traffic can be opened for maintenance, but heavy vehicles are strictly prohibited from compaction. During the maintenance period, the vehicle speed should be below 40 km/h, and sudden braking is strictly prohibited. Vehicles are also prohibited from turning around on the road surface during the maintenance period. The foam asphalt recycled composite pavement can be cured when it meets one of the following conditions: the curing time is not less than 7 days, the moisture content is less than 2%, and the complete core sample can be taken out. Generally, cement stabilized macadam foam asphalt recycled composite can take out complete core samples after natural curing for 3 days in sunny days.

　　原地冷再泡瀝青的功效指標(biāo)，須符合公路路面瀝青材料規(guī)定和路段冷再泡瀝青的設(shè)計(jì)指標(biāo)要求。瀝青擁有良好發(fā)泡特性，其半衰期和膨脹率應(yīng)分別符合不低于8 s和不低于10倍。當(dāng)瀝青廠家、批次發(fā)生變化時，應(yīng)重新給予發(fā)泡試驗(yàn)檢測，以明確發(fā)泡技術(shù)參數(shù)，必要時重新設(shè)計(jì)復(fù)合料配比。

　　The efficacy indicators of in-situ cold recycled foamed asphalt must comply with the requirements of highway pavement asphalt material regulations and the design indicators of cold recycled foamed asphalt for road sections. Asphalt has good foaming properties, and its half-life and expansion rate should be no less than 8 seconds and no less than 10 times, respectively. When there is a change in the asphalt manufacturer or batch, the foaming test should be conducted again to clarify the foaming technical parameters, and if necessary, the composite material ratio should be redesigned.

　　原地冷再泡瀝青復(fù)合料在水泥應(yīng)用上，可以選擇應(yīng)用普通硅酸鹽水泥、礦渣硅酸鹽水泥、火山灰硅酸鹽水泥，但不可應(yīng)用早強(qiáng)水泥或者快硬水泥。水泥強(qiáng)度級別可以是42.5級別，也可以是32.5級別。水泥應(yīng)干燥、疏松，無結(jié)塊、聚團(tuán)，不得應(yīng)用潮濕變質(zhì)水泥。當(dāng)水泥廠家、型號、批次等發(fā)生改變時，須通過試驗(yàn)驗(yàn)證其適用性。

　　In the application of in-situ cold regenerated foamed asphalt composite materials in cement, ordinary Portland cement, slag Portland cement, and volcanic ash Portland cement can be selected, but early strength cement or fast hardening cement cannot be used. The strength grade of cement can be 42.5 or 32.5. Cement should be dry, loose, without clumping or agglomeration, and damp deteriorated cement should not be used. When there are changes in the cement manufacturer, model, batch, etc., their applicability must be verified through testing.

　　瀝青發(fā)泡用水，現(xiàn)場冷再生拌合加水，應(yīng)保證達(dá)到飲用水標(biāo)準(zhǔn)。

　　The water used for asphalt foaming and on-site cold recycling mixing should meet the drinking water standards.

　　因?yàn)榕巽娏鲜莵碓从谂f瀝青面層的回收再利用，老化瀝青舊料的含水量嚴(yán)重不足。為保證再生瀝青新復(fù)合料的組分質(zhì)量，首當(dāng)其沖的是加強(qiáng)刨銑料的含水量檢測，充分掌握刨銑舊料的含水量狀態(tài)，從而確定再生瀝青新復(fù)合料的調(diào)拌加水量。檢測刨銑料的含水量，建議采用酒精法進(jìn)行檢測，

　　Because the milling material comes from the recycling and reuse of old asphalt surface layer, the moisture content of aged asphalt old material is seriously insufficient. To ensure the quality of the components of the recycled asphalt new composite material, the first priority is to strengthen the moisture content detection of the milling material, fully grasp the moisture content status of the milling old material, and thus determine the mixing and adding water amount of the recycled asphalt new composite material. It is recommended to use the alcohol method to detect the moisture content of the milling material,

　　研究和工程經(jīng)驗(yàn)顯示，調(diào)拌好的再生復(fù)合料，手抓握成團(tuán)，黏結(jié)性良好，手上瀝青點(diǎn)分布均勻，則調(diào)拌質(zhì)量良好。如果發(fā)現(xiàn)再生復(fù)合料中存在瀝青團(tuán)或絲狀瀝青，則表明復(fù)合料中泡沫瀝青的分散均勻度不足。依據(jù)該方法，可對再生復(fù)合料的摻拌質(zhì)量開展測定。如果發(fā)現(xiàn)再生復(fù)合料調(diào)拌質(zhì)量較差，就需要檢查罐車中的瀝青溫度是不是達(dá)到要求，瀝青發(fā)泡功效是不是較好，刨銑料的水分含量等技術(shù)指標(biāo)，及時調(diào)整組分參數(shù)，提高再生復(fù)合料調(diào)拌質(zhì)量。

　　Research and engineering experience have shown that when mixed with recycled composite materials, they can be grasped by hand into clumps, have good adhesion, and have even distribution of asphalt points on their hands, indicating good mixing quality. If asphalt agglomerate or filamentous asphalt is found in the recycled composite, it indicates that the dispersion uniformity of foam asphalt in the composite is insufficient. According to this method, the mixing quality of recycled composite materials can be measured. If it is found that the mixing quality of recycled composite materials is poor, it is necessary to check whether the asphalt temperature in the tanker truck meets the requirements, whether the asphalt foaming effect is good, the moisture content of the milling material and other technical indicators, adjust the component parameters in a timely manner, and improve the mixing quality of recycled composite materials.

　　(1)介紹泡沫瀝青原地冷再生復(fù)合料的配制技術(shù)要點(diǎn)。細(xì)集料劑量過低時，再生料的抗疲勞、抗水損、抗拉和抗壓功效較差；在原瀝青刨銑料的附著力不足或車流量大的路面，可適當(dāng)增加水泥用量，但是不宜大于2.5%;再生料的含水量控制在80%左右；泡沫瀝青的半衰期和膨脹率，應(yīng)分別滿足不低于8倍和不低于10倍的要求；案例工程的泡沫瀝青級配優(yōu)化方案為1.5%水泥+8.5%石屑+90%刨銑料+2.5%泡沫瀝青含量。

　　(1) This paper introduces the key points of compounding technology of foam asphalt in-situ cold recycling composite. When the dosage of fine aggregate is too low, the anti fatigue, anti water damage, tensile and compressive effects of recycled materials are poor; On roads with insufficient adhesion of the original asphalt milling material or high traffic flow, the amount of cement used can be appropriately increased, but should not exceed 2.5%; The moisture content of recycled materials should be controlled at around 80%; The half-life and expansion rate of foam asphalt shall not be less than 8 times and 10 times respectively; The foam asphalt grading optimization scheme of the case project is 1.5% cement+8.5% stone chips+90% planed and milled material+2.5% foam asphalt content.

　　(2)介紹了泡沫瀝青原地冷再生施工技術(shù)要點(diǎn)。工前檢查工程裝備的功效狀態(tài)；對下承載層強(qiáng)度不足、裂隙、松散、凹坑等病害，應(yīng)給予處理；每刨銑一段距離，對應(yīng)開展一次含水量測試；原地冷再生施工的作業(yè)溫度，不宜低于10 ℃;雙光輪壓道機(jī)，1.5～3.0 km/h壓碾速率，高振幅振動壓道機(jī)，2～4 km/h壓碾速率；輪胎壓道機(jī)，2～4 km/h壓碾速率；控制再生機(jī)組停機(jī)頻次，避免過多出現(xiàn)橫向斷帶現(xiàn)象；不同工作面之間應(yīng)設(shè)置不小于15 cm的搭接寬度；養(yǎng)生期間的車輛行駛速率，應(yīng)低于40 km/h, 并且嚴(yán)禁車輛急剎車，也要禁止車輛在養(yǎng)生期間的路面上掉頭。

　　(2) This paper introduces the key points of the construction technology of the in situ cold recycling of foam asphalt. Pre work inspection of the functional status of engineering equipment; Insufficient strength, cracks, looseness, pits and other defects in the lower bearing layer should be treated; Conduct a moisture content test for each milling distance; The operating temperature for on-site cold recycling construction should not be lower than 10 ℃; Double wheel roller, rolling speed of 1.5-3.0 km/h, high amplitude vibration roller, rolling speed of 2-4 km/h; Tire roller, with a rolling speed of 2-4 km/h; Control the shutdown frequency of the regeneration unit to avoid excessive occurrence of lateral belt breakage; A minimum overlap width of 15 cm should be set between different working surfaces; The driving speed of vehicles during the health preservation period should be below 40 km/h, and sudden braking is strictly prohibited. Vehicles are also prohibited from making U-turns on the road during the health preservation period.

　　(3)主要從材料質(zhì)量控制和施工操作質(zhì)量控制兩方面，控制泡沫瀝青原地冷再生質(zhì)量。施工前材料質(zhì)量控制，著重從水泥、瀝青、用水量的質(zhì)量和組分劑量控制入手；施工過程中的質(zhì)量控制，著重從復(fù)合料的攪拌和加水量質(zhì)量控制入手。

　　(3) The quality of in situ cold recycling of foam asphalt is mainly controlled from two aspects: material quality control and construction operation quality control. Pre construction material quality control, focusing on the quality and component dosage control of cement, asphalt, and water consumption; The quality control during the construction process focuses on the mixing of composite materials and the quality control of water addition.

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