水稳碎石施工中注意的问题:

　　Issues to be noted in the construction of water stable crushed stone:

　　（1）厂拌设备的选型拌和设备的质量直接影响混合料拌和的质量，而拌和设备的好坏的关键就要看其骨料、粉料、水等各种物料的配合比精度是否能够得到保证，本标段选用WBC300型稳定土厂拌设备。该设备采用电磁调速控制系统，能较好的保证各种物料的配合比，且拌和均匀，性能稳定。

　　(1) The selection of plant mixing equipment directly affects the quality of the mixture mixing, and the key to the quality of the mixing equipment depends on whether the accuracy of the mix proportions of various materials such as aggregates, powders, and water can be guaranteed. For this section, WBC300 stabilized soil plant mixing equipment is selected. The device adopts an electromagnetic speed control system, which can ensure the mixing ratio of various materials, and mix evenly with stable performance.

　　（2）严格控制水泥剂量水泥剂量太小，不能保证水泥稳定土的施工质量;而剂量太大，既不经济，还会使基层的裂缝增多、增宽，从而引起沥青面层的相对应的反射裂缝。所以，必须严格控制水泥用量，做到经济合理，精益求精，以确保工程质量。

　　(2) Strictly controlling the dosage of cement is too small to ensure the construction quality of cement stabilized soil; However, excessive dosage is not only uneconomical, but also increases and widens the cracks in the base layer, thereby causing corresponding reflection cracks in the asphalt surface layer. Therefore, it is necessary to strictly control the amount of cement used, achieve economic rationality, and strive for excellence to ensure the quality of the project.

　　（3）混合料的含水量控制厂拌混合料现场，每天由后场专职试验人员在早上、中午、下午分别测定各种集料的含水量，根据施工配合比设计的最佳含水量指标，结合当天的气温、湿度、运距情况确定混合料拌和时的用水量。在前场负责检测压实度的专职试验人员，在混合料摊铺整型过程中亦及时测定混合料的含水量，及时指挥压路机碾压，力求在最佳含水量条件下碾压，尽量避免由于含水量过大出现“弹软”、“波浪”等现象，影响混合料可能达到密度和强度，增大混合料的干缩性，使结构层容易产生干缩裂缝;或由于含水量偏小使混合料容易松散，不易碾压成型，也会影响混合料可能达到的密度和强度。所以只有严格按规范施工，加强每一施工环节的质量控制，才能保证施工质量。

　　(3) The moisture content of the mixture is controlled at the factory mixing site. The moisture content of various aggregates is measured daily by dedicated testing personnel in the back office in the morning, noon, and afternoon. Based on the optimal moisture content index designed according to the construction mix ratio, and combined with the temperature, humidity, and transportation distance of the day, the water consumption for mixing the mixture is determined. The dedicated testing personnel responsible for checking the compaction degree in the front field also timely measure the moisture content of the mixture during the paving and shaping process, command the roller to roll in a timely manner, strive to roll under the optimal moisture content conditions, and try to avoid phenomena such as "elasticity" and "waves" due to excessive moisture content, which may affect the density and strength of the mixture, increase the drying shrinkage of the mixture, and make the structural layer prone to drying shrinkage cracks; Or due to the low moisture content, the mixture is prone to looseness and difficult to roll into shape, which can also affect the density and strength that the mixture may achieve. So only by strictly following the standards of construction and strengthening the quality control of each construction process can the construction quality be guaranteed.

　　（4）减少混合料的离析混合料的运输应避免车辆的颠簸。在气温较高、运距较远时要加盖毡布，以防止水分过分损失。摊铺、碾压时，摊铺系数1.3∽1.5之间(正常速度下英格索兰摊铺机为1.3、徐工摊铺机为1.5、且摊铺系数与摊铺机的行使速度也有关)，施工中必须贯彻“宁高勿低、宁刮勿补”的原则， 全部施工工程力争在水泥终凝时间前完成。碾压完毕立即做密实度试验，若试验结果达不到标准重新进行碾压。

　　(4) Reduce the segregation of the mixture. The transportation of the mixture should avoid vehicle bumps. When the temperature is high and the transportation distance is far, it is necessary to cover it with felt cloth to prevent excessive loss of moisture. When paving and rolling, the paving coefficient should be between 1.3 and 1.5 (1.3 for Ingersoll Rand pavers and 1.5 for XCMG pavers at normal speeds, and the paving coefficient is also related to the speed of the pavers). During construction, the principle of "better high than low, better scraping than repairing" must be implemented, and all construction projects should be completed before the final setting time of cement. Immediately conduct a compaction test after compaction is completed, and if the test results do not meet the standards, re compact.

　　（5）混合料摊铺接缝的处理接缝有纵向接缝和横向接缝两种，当摊铺机宽度足够时，整幅摊铺时不存在纵缝接缝问题。当摊铺机的摊铺宽度不足时，采用2台摊铺机一前一后同步向前摊铺混合料，并一起进行碾压，这样也可以避免纵向接缝。由于本标段结构物较多，一般情况下都以两结构物间为一施工段落，避免了横向接缝，如有特殊，需设置横向接缝，其处理方法是将摊铺机附近及其下面未经压实的混合料铲除，将已碾压密实且高程和平整度符合要求的末端挖成一横向垂直向下的断面，摊铺机返回到压实层的端部，用木垫板垫至虚铺高度，再摊铺新的混合料，继续下一步施工。

　　(5) There are two types of joint treatment for mixed material paving: longitudinal joint and transverse joint. When the width of the paving machine is sufficient, there is no longitudinal joint problem during the entire paving process. When the paving width of the paver is insufficient, two pavers are used, one in front and one behind, to synchronously spread the mixture forward and roll it together, which can also avoid longitudinal joints. Due to the large number of structures in this section, it is generally considered as one construction section between two structures to avoid transverse joints. If there are special circumstances, transverse joints need to be set up. The treatment method is to remove the uncompacted mixture near and below the paver, excavate the end that has been compacted and meets the requirements for elevation and flatness into a transverse vertical downward section, and return the paver to the end of the compacted layer. Use wooden pads to cushion to the virtual paving height, then spread new mixture, and continue with the next step of construction.

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