案例公路为一级标准公路，双向四车道，总长16.08 km。原为混凝土路面，经过一段时间的使用后，部分路面出现裂缝、车辙、坑洼等病害，并且面层结构毁坏严重。维修养护工程中，应用了泡沫沥青原地冷再生技术，即：刨铣原沥青面层，刨铣后给予原基础层以水泥稳定工艺处理，再将刨铣所获得的旧沥青材料进行再泡处理，用于新面层铺筑，构成再生柔性面层。该冷再生技术，不仅提高面层强度和抗疲劳性，还一定程度克服了半刚性面层的反射裂隙问题。

　　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 Originally made of concrete pavement, after a period of use, some parts of the pavement have developed cracks, ruts, potholes and other defects, and the surface structure has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.

　　水泥对泡沫沥青原地冷再生复合料有多种作用。水泥会降低再生复合料弹性，增加再生复合料的收缩率，提高再生料稳定性，增强再生料的强度和耐疲劳功效。施工时，应依据刨铣旧料的功效状态和不同车道的功效要求，来确定新复合料中的水泥用量。通常状态下，在原沥青刨铣料的附着力不足或车流量大的路面，可适当增加水泥用量，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%.

　　不同区段的刨铣料级配差异很大。复合料中小于0.075 mm的颗粒剂量，对泡沫沥青再生复合料的功效有显着影响。剂量过低时，再生料的抗疲劳、抗水损、抗拉和抗压功效较差。因此，为了充分发挥再生复合料的良好功效，需要依据原路面的实际状态，开展分段设计，依据需求加添新骨料，使再生复合料有较好级配，限度地提高再生复合料质量。

　　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.

　　受区域气候条件、原路面病害、原路基含水量的影响，不同区段的刨铣料，其含水量也不同。含水量影响复合料掺拌均匀性，进而影响再生复合料的功效。应依据不同路段刨铣料的含水量，确定泡沫沥青再生复合料的加水量，使再生料的含水量控制在80%左右。如果雨后的刨铣料含水量高出合适的掺拌用水量，不可以立即施工。而应在空气中自然晾干，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.

　　泡沫沥青的发泡特性，影响泡沫沥青复合料的骨料与沥青的混合均匀度，从而影响复合料的路用功效。如果半衰期过短，就会不利于沥青在复合料中的均匀分散。如果膨胀率过低，就会使沥青黏度大，易与骨料结块，不能与骨料混合均匀。因此，为确保再生复合料的质量，泡沫沥青的半衰期和膨胀率，应分别满足不低于8倍和不低于10倍的要求。影响沥青发泡的因素有很多，包括沥青温度、沥青种类和耗水量等。

　　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.

　　一般刨铣旧料中的细料含量均相对较低，未经补量调配，不会符合新复合料的级配需求。比如案例刨铣料的筛选分析显示，其0.075 mm组分含量仅为2.0%,要满足再生复合料级配技术需求，就需要添加一些细料来满足级配。加添细料的种类和比例，应通过实验给予确定。案例工程基于2种级配方案开展级配实验，即1.5%水泥+18.5%石屑+80%刨铣料(A组);1.5%水泥+8.5%石屑+90%刨铣料(B组)。试验结果揭示，当泡沫沥青分别采取2%、2.5%、3%和3.5%剂量时，方案B的干湿性能优于方案A,而且泡沫沥青含量2.5%时，为泡沫沥青再生复合料方案。所以案例工程的泡沫沥青级配优化方案为1.5%水泥+8.5%石屑+90%刨铣料+2.5%泡沫沥青含量。

　　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.

　　对水泥、沥青、掺拌用水、新骨料等材料的来源和质量开展检测分析。不得使用不满足质量要求的材料。核查泡沫沥青的温度功效，温度不能过低，否则会影响沥青的发泡功效，从而影响了工程质量。

　　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.

　　泡沫沥青原地冷再生工程机械，一般由冷再生机组、水罐车、水泥浆车、热沥青罐车、压路机等构成，工前检查相关装备和功效状态，以保证装备齐全，技术状态良好。

　　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.

　　泡沫沥青原地冷再生厚度，通常在16.0 cm左右。为了使再生层具有良好基础，充分发挥的路用功效，要求下承重层具有良好的整体性，并满足结构层的功效要求。因此在再生施工前，对下承载层的强度不足的区域，应给予补强处理。对刨铣后的旧路面可能存在的裂隙、松散、凹坑等病害，给予处理。还要对旧路面进行清理，不可有油污或杂物。还要与交通管理部门沟通，协调安排好施工区段临时关闭交通。

　　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.

　　再生机的作业行进速率，不仅影响作业效率，而且对刨铣料的质量也有显着影响。作业行进速率越慢，级配越细，越快，级配越粗。尤其是在水害或开裂严重的区段，如果运行速率较快，刨铣料中会存在相当数量的块体破碎不充分，从而影响再生复合料质量。作业行进速率不均匀，再生复合料的级配，就会发生比较大的分散性。刨铣机的作业行进速率，一般应控制在3～8 m/min区间。

　　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.

　　施工实践发现，罐车内沥青温度过低，往往会影响沥青发泡功效，进而影响再生复合料的路用功效。因此，每次更换罐车前，一定要检查罐车温度，实时监测沥青发泡功效。

　　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.

　　不同路段的刨铣料的水分含量有所不同，为尽量控制加水量差异对再生复合料功效的不利影响，在施工操作中，应每刨铣一段距离，对应开展一次含水量测试，以调节搅拌加水量。搅拌温度是指搅拌过程中骨料的温度。搅拌温度对泡沫沥青的分散功效存在影响。如果搅拌温度太低，泡沫沥青在遇到骨料后会立刻冷却，造成衰变过快，不利于复合料中泡沫沥青的分散。试验研究显示，原地冷再生施工的作业温度，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 ℃.

　　压密对于原地冷再生复合料的强度实现非常重要。因此施工中，一定要合理应用压密机械并提供合理的压密操作。一般应配备1台12 t双钢轮压道机，1台25 t振动钢轮，1台16 t振动单钢轮压道机。具体压密过程如下：①初压。为了确保再生复合料压密度，原地冷再生应采取流水工艺。待再生机运行完毕后，立刻使用双光轮压道机，以1.5～3.0 km/h的压碾速率，进行静压1次。②复压。为了有效压密再生复合料整体结构层，选择重型压道机。先采取高振幅低频方式压碾；然后，采取高频低振幅压碾；压碾速率应控制在2～4 km/h。③终压。应用轮胎压道机开展压碾，速率应为2～4 km/h; 如果有轮痕，应使用光轮压道机再次压碾一遍收光。尽管增加压密度有利于增强再生层的路用功效，但是要注意不要过度压碾，以免发生起皮、弹簧现象。如果出现这些质量问题，再生层需要重新翻拌压碾。

　　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.

　　当再生机每次停止工作时，均可能发生一个横向接缝。因此，在施工中，应尽可能控制再生机停机频次，避免过多出现横向断带现象。再生机的喷油速率由机带微处理器自动控制，当再生机运行缓慢时，喷油速率则会降低。当再生机启动或停止时，因为这时的行进速率相对慢，喷压一般会降低到无法有效喷射泡沫沥青的程度，进而影响再生层功效。为了解决此问题，较为常见的做法为：再生机在横向接缝处，后退一个转子距离，约1.5 m左右，然后全速启动前进，达到正常施工速率，完成横向接缝处的作业和质量衔接。对于纵方向接缝，可采用下述方法处理：不同工作面之间应设置不小于15 cm的搭接宽度，搭接宽度应依据再生层的厚度、刨铣料性质，以及相邻工作面之间的时段间隔给予确定。同时，为防止搭接处泡沫沥青、水泥和水的添加不合理，应在转子宽度中扣除搭接宽度，作为再生作业宽度，以确保再生路面质量。

　　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.

　　与水泥再生复合料不同，泡沫沥青再生复合料，采取自然养生方式，通常无需采用其他辅助措施。再生复合料压碾完成1 d以后，可开放交通进行养生，但是要严禁重型车辆压碾，养生期间的车辆行驶速率，应低于40 km/h, 并且严禁车辆急刹车，也要禁止车辆在养生期间的路面上掉头。泡沫沥青再生复合料路面在满足如下条件之一：养生时间不小于7 d、含水量低于2%、可取出完整的芯样，即可完成养生。一般水泥稳定碎石泡沫沥青再生复合料，在晴天自然养生3 d后，即可取出完整的芯样。

　　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.

　　原地冷再泡沥青的功效指标，须符合公路路面沥青材料规定和路段冷再泡沥青的设计指标要求。沥青拥有良好发泡特性，其半衰期和膨胀率应分别符合不低于8 s和不低于10倍。当沥青厂家、批次发生变化时，应重新给予发泡试验检测，以明确发泡技术参数，必要时重新设计复合料配比。

　　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.

　　原地冷再泡沥青复合料在水泥应用上，可以选择应用普通硅酸盐水泥、矿渣硅酸盐水泥、火山灰硅酸盐水泥，但不可应用早强水泥或者快硬水泥。水泥强度级别可以是42.5级别，也可以是32.5级别。水泥应干燥、疏松，无结块、聚团，不得应用潮湿变质水泥。当水泥厂家、型号、批次等发生改变时，须通过试验验证其适用性。

　　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.

　　沥青发泡用水，现场冷再生拌合加水，应保证达到饮用水标准。

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

　　因为刨铣料是来源于旧沥青面层的回收再利用，老化沥青旧料的含水量严重不足。为保证再生沥青新复合料的组分质量，首当其冲的是加强刨铣料的含水量检测，充分掌握刨铣旧料的含水量状态，从而确定再生沥青新复合料的调拌加水量。检测刨铣料的含水量，建议采用酒精法进行检测，

　　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,

　　研究和工程经验显示，调拌好的再生复合料，手抓握成团，黏结性良好，手上沥青点分布均匀，则调拌质量良好。如果发现再生复合料中存在沥青团或丝状沥青，则表明复合料中泡沫沥青的分散均匀度不足。依据该方法，可对再生复合料的掺拌质量开展测定。如果发现再生复合料调拌质量较差，就需要检查罐车中的沥青温度是不是达到要求，沥青发泡功效是不是较好，刨铣料的水分含量等技术指标，及时调整组分参数，提高再生复合料调拌质量。

　　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)介绍泡沫沥青原地冷再生复合料的配制技术要点。细集料剂量过低时，再生料的抗疲劳、抗水损、抗拉和抗压功效较差；在原沥青刨铣料的附着力不足或车流量大的路面，可适当增加水泥用量，但是不宜大于2.5%;再生料的含水量控制在80%左右；泡沫沥青的半衰期和膨胀率，应分别满足不低于8倍和不低于10倍的要求；案例工程的泡沫沥青级配优化方案为1.5%水泥+8.5%石屑+90%刨铣料+2.5%泡沫沥青含量。

　　(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)介绍了泡沫沥青原地冷再生施工技术要点。工前检查工程装备的功效状态；对下承载层强度不足、裂隙、松散、凹坑等病害，应给予处理；每刨铣一段距离，对应开展一次含水量测试；原地冷再生施工的作业温度，不宜低于10 ℃;双光轮压道机，1.5～3.0 km/h压碾速率，高振幅振动压道机，2～4 km/h压碾速率；轮胎压道机，2～4 km/h压碾速率；控制再生机组停机频次，避免过多出现横向断带现象；不同工作面之间应设置不小于15 cm的搭接宽度；养生期间的车辆行驶速率，应低于40 km/h, 并且严禁车辆急刹车，也要禁止车辆在养生期间的路面上掉头。

　　(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)主要从材料质量控制和施工操作质量控制两方面，控制泡沫沥青原地冷再生质量。施工前材料质量控制，着重从水泥、沥青、用水量的质量和组分剂量控制入手；施工过程中的质量控制，着重从复合料的搅拌和加水量质量控制入手。

　　(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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