1. Unreasonable discharge residual rate and blade design. From the internal structure of the mixing drum, the mixing drum of the concrete mixer truck relies on the rotating drum to drive the spiral motion generated by the two spiral blades, so that the concrete can obtain both "tangential" and "axial" composite motion, so that the mixing drum has the functions of mixing and unloading. Therefore, the relevant factors forming this spiral motion, such as the curve parameters of the spiral blades, The geometry and size of the mixing drum have an important impact on the discharge residual rate of the mixing truck. The excessive unloading residual rate means that there will be more surplus materials in the mixing tank after unloading, so it is more likely to stick materials in the mixing tank over time.
2.运输距离过长。随着城市化的进程及城市规划的要求，越来越多的搅拌站被要求迁到郊区和郊县，与市区的距离越来越远，而由于混凝土这一产品的特殊性，任何预拌混凝土在未添加缓凝剂的情况下，都在1h左右进入初凝状态，如果这时才进行混凝土浇注施工，不但影响混凝土的工程质量，而且因混凝土失去流动性，易在搅拌筒及叶片上凝结，导致粘罐，严重时甚整车混凝土粘在罐内及造成液压设备的损坏，所以混凝土搅拌车运送预拌混凝土有其时间控制的输送半径，一般应控制在1h以内。
2. The transportation distance is too long. With the process of urbanization and the requirements of urban planning, more and more mixing plants are required to move to suburbs and suburban counties, which are farther and farther away from the urban area. Due to the particularity of concrete, any ready mixed concrete will enter the initial setting state from left to right within 1h without adding retarder. If the concrete pouring construction is carried out at this time, It not only affects the engineering quality of concrete, but also because the concrete loses fluidity, it is easy to condense on the mixing drum and blades, resulting in tank sticking. In serious cases, even the whole vehicle concrete sticks in the tank and causes damage to hydraulic equipment. Therefore, the transportation radius of ready mixed concrete by concrete mixer truck is controlled within 1h.
3.工地施工设计不合理。工地在墙柱等施工中，会用塔吊吊斗车的方法进行浇捣，由于塔吊的料本来塌落度就比泵送的低，更由于施工时间长，卸一车混凝土通常要2~4h，有些驾驶员为了省油而停止搅拌筒的正常转动，这种情况下，特别容易造成粘罐，有时9方车一次粘罐就达1t，在夏天情况更严重。
3. Unreasonable site construction design. During the construction of walls and columns on the construction site, the tower crane bucket truck will be used for pouring and tamping. Because the slump of the tower crane is lower than that of the pump, and because the construction time is long, it usually takes 2 ~ 4H to unload a truck of concrete. Some drivers stop the normal rotation of the mixing drum in order to save oil. In this case, it is particularly easy to cause tank sticking. Sometimes the tank sticking of the 9-square truck can reach 1t at a time, The situation is more serious in summer.
4.使用维护不当。混凝土搅拌车驾驶员在搅拌车卸料完毕后未及时清理清洗搅拌罐内及叶片上残留的混凝土，在搅拌车回站过程中不转动搅拌罐，残留的混凝土干燥后凝固在拌筒及叶片上，以后就会越聚越多，形成粘罐现象。
4. Improper use and maintenance. The driver of the concrete mixer truck fails to clean the residual concrete in the mixing tank and on the blades in time after the unloading of the mixer truck. During the return of the mixer truck to the station, the mixing tank does not rotate. The residual concrete will solidify on the mixing drum and blades after drying, and will gather more and more in the future, forming the phenomenon of tank sticking.
5.混凝土搅拌车工作环境温度过高。夏季在南方地区白天中午前后，环境温度经常超过30℃，在这种情况下运输混凝土，将会由于混凝土坍落度损失快以及罐体周围温度相对中心更高，因而混凝土更容易粘罐。
5. The working environment temperature of concrete mixer is too high. In summer, the ambient temperature often exceeds 30 ℃ around noon in the South during the day. In this case, when transporting concrete, it will be easier for the concrete to stick to the tank due to the rapid loss of concrete slump and the higher temperature around the tank relative to the center.
