Reasons for bleeding and segregation of concrete in Zhongke Jufeng concrete mixer truck!

很多的自上料搅拌车司机担心的就是搅拌车中的混凝土出现泌水和离析，针对这个问题我们首先要知道原因，才能从根本上来解决问题。自上料搅拌车中的混凝土出现泌水、离析的原因：

Many self loading mixer truck drivers are worried about the bleeding and segregation of concrete in the mixer truck. In view of this problem, we must first know the reasons in order to fundamentally solve the problem. Causes of bleeding and segregation of concrete in self loading mixer truck:

1. 水泥细度大时易泌水，水泥中C3A含量低易泌水，水泥标准稠度用水量小易泌水。水泥用量小易泌水；

1. It is easy to bleed when the fineness of cement is large, and it is easy to bleed when the content of C3A in cement is low, and it is easy to bleed when the water consumption of cement standard consistency is small. It is easy to bleed when the cement dosage is small;

2. 低标号水泥比高标号水泥的混凝土易泌水（同掺量）。 同等级混凝土，高标号水泥的混凝土比低标号水泥的混凝土更易泌水。 单位用量偏大的混凝土易泌水、离析。

2. The concrete with low grade cement is easier to bleed than that with high grade cement. With the same grade of concrete, the concrete with high grade cement is easier to bleed than the concrete with low grade cement. The concrete with larger unit consumption is prone to bleeding and segregation.
         

3. 混凝土混合物温度过高，尤其是夏天，气温高，水化反应快，塌落度损失大。 强度等级低的混凝土易出现泌水。砂率小的混凝土易出现泌水、离析现象。连续粒径碎石的砼泌水小；

3. The temperature of concrete mixture is too high, especially in summer. The concrete with low strength grade is prone to bleeding. The concrete with small sand ratio is prone to bleeding and segregation. The concrete bleeding of continuous size gravel is small;

4. 混凝土外加剂的保水性、增稠性、引气性差的混凝土易出现泌水。超量掺混凝土外加剂的混凝土易出现泌水、离析现象。部分型号的混凝土搅拌车搅拌性能不良，经一定的路程的运送，初始出料时混凝土混合物发生明显的粗骨料上浮现象；

4. The concrete with poor water retention, thickening and air entrainment of concrete admixtures is prone to bleeding. The concrete with excessive concrete admixtures is prone to bleeding and segregation. The mixing performance of some types of concrete mixers is poor. After a certain distance of transportation, the coarse aggregate floats obviously when the concrete mixture is initially discharged;

5. 自上料搅拌车搅拌筒内有积水，装料前未排干净或在运送过程中，任意往搅拌筒内加水。

5. There is water in the mixing drum of self feeding mixer, which is not drained before loading, or water is added into the mixing drum arbitrarily during transportation.

有问题就一定能找到解决问题的办法，下面自上料搅拌车说说解决问题的方法：

If there is a problem, you can find a solution to the problem

1. 根本的解决办法就是减少单位用水量；2. 加大砂率，选择合理的砂率；3. 炎热夏季，采取措施降低混凝土混合物的温度；4. 加大水泥用量或掺适量的Ⅰ、Ⅱ级粉煤灰；5. 采用连续级配的碎石，且针片状含量小；6. 改善混凝土外加剂性能，使其具有更好的保水。增稠性，或适量减低砼外加剂掺量（仅现场），搅拌站若降低混凝土外加剂掺量，又可能出现混凝土砼塌落损失快的新问题；7. 自上料搅拌车在卸料前，应中、高速旋转搅拌筒，是混凝土混合物均匀后卸料；8. 加强管理，对清洗后的搅拌车搅拌筒，须排尽积水后方可装料。装料后，严禁随意往搅拌筒内加水。自上料搅拌车的泌水、离析问题找准原因就很容易解决了！

1. The fundamental solution is to reduce the unit water consumption; 2. Increase the sand rate and select a reasonable sand rate; 3. Take measures to reduce the temperature of concrete mixture in hot summer; 4. Increase the amount of cement or mix appropriate amount of grade I and II fly ash; 5. Use continuously graded gravel with small needle like content; 6. Improve the performance of concrete admixture to make it have better water retention. Thickening, or reducing the amount of concrete admixtures (only on site), if the mixing station reduces the amount of concrete admixtures, the new problem of rapid collapse loss of concrete may appear; 7. Before discharging, the self loading mixer truck should rotate the mixing drum at medium and high speed, so as to discharge after the concrete mixture is uniform; 8 Strengthen management, after cleaning the mixer drum, must drain the water before loading. After loading, it is forbidden to add water to the mixing drum at will. It is easy to solve the problem of bleeding and segregation of feeding mixer!

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