行业资讯
水泥稳定碎石怎么取不出完整的芯样？
来源：/ 日期：2023-01-04
按照技术规范要求，济南水泥稳定碎石层龄期7d~10d，应能取出完整的钻件，可实际情况是部分路段因为松散，不能取出完整的芯样。其原因是什么呢？
According to the requirements of the technical specifications, the Jinan cement stabilized macadam layer has an age of 7d~10d, and it should be able to take out complete drill pieces. However, the actual situation is that some sections cannot take out complete core samples because they are loose. What is the reason?
1）水泥用量偏少造成骨料之间胶结不好，达不到强度；
1) The cement consumption is too small, resulting in poor cementation between aggregates and failure to reach the strength;
2）没有完全按照规范要求进行养护，按规范要求每一段碾压完成并经压实度检查合格后，应立即养生，宜采用湿砂进行养生，砂层厚度为7cm~10cm。也可采用沥青乳液进行养生，无述条件时，也可用洒水车结常洒水进行养生。养生期不宜少于7天；
2) If the curing is not carried out in full accordance with the specification requirements, the curing shall be carried out immediately after the compaction of each section is completed according to the specification requirements and the compactness is checked to be qualified. It is better to use wet sand for curing. The thickness of the sand layer is 7cm~10cm. Asphalt lotion can also be used for curing. If there are no conditions mentioned above, the watering cart can also be used for curing. The curing period should not be less than 7 days;
3）水泥稳定碎石层原材料级配不好；
3) The raw materials of cement stabilized macadam are poorly graded;
4）含水量不合适，以于水泥不能在混合料中完全水化和水解，水泥对碎石的稳定作用没发挥，影响水泥稳定碎石的强度；
4) The water content is not appropriate, so that the cement cannot be fully hydrated and hydrolyzed in the mixture, and the cement does not play a role in stabilizing the crushed stone, affecting the strength of cement stabilized crushed stone;
5）水泥选用不当，普通硅酸盐水泥，矿渣硅酸盐水泥和火山灰质硅酸盐水泥都可用水泥稳定碎石，但应选用初凝时间3h以上和终凝时间较长（宜在6h以上）。不宜使用快硬水泥，早强水泥以及已受潮变质的水泥；
5) Improper cement selection. Ordinary Portland cement, slag Portland cement and pozzolanic Portland cement can be used to stabilize crushed stone, but the initial setting time shall be more than 3h and the final setting time shall be longer (preferably more than 6h). Fast hardening cement, early strength cement and cement that has been damped and deteriorated should not be used;
6）拌合得不均匀，且没在佳含水量下充分压实，以及施工碾压时间拖的过长，破坏了已结硬的水泥胶凝，使其强度下降。
6) Uneven mixing, insufficient compaction under good water content, and too long construction rolling time destroy the hardened cement gel and reduce its strength.
预防措施：
Preventive measures:
1）原材料方面，每批水泥应检验合格后，才能进行使用；对于碎石，要符合级配要求，大料径不要超过31.5mm，对于不合格的材料严禁进入场地；
1) In terms of raw materials, each batch of cement can only be used after passing the inspection; Crushed stone shall meet the grading requirements, and the large material diameter shall not exceed 31.5mm. Unqualified materials shall not enter the site;
2）改进拌合工艺，尽量避免离析的产生，施工人员要加强对水泥剂的控制，发现了问题要及时改进与处理；
2) The mixing process shall be improved to avoid segregation as much as possible. The construction personnel shall strengthen the control of the cement agent, and timely improve and handle the problems found;
3）抖合的计量器具要在开工前送计量质量检测中心进行检定，以保证称量的准确无误；
3) Shattered measuring instruments shall be sent to the Measurement Quality Inspection Center for verification before commencement to ensure the accuracy of weighing;
4）在运输过程中要避免使用小型送料车，混合料要覆盖，减少运输途中水分的蒸发。
4) Small feeder trucks shall be avoided during transportation, and the mixture shall be covered to reduce evaporation of water during transportation.
The occurrence of these quality problems of cement stabilized macadam base requires operators to strictly control each process. Only in this way can the quality of cement stabilized macadam be guaranteed and the occurrence of diseases be avoided. More relevant content will come to our website Ask and understand!
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