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

很多的自上料攪拌車司機擔(dān)心的就是攪拌車中的混凝土出現(xiàn)泌水和離析，針對這個問題我們要知道原因，才能從根本上來問題。自上料攪拌車中的混凝土出現(xiàn)泌水、離析的原因：

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. 水泥細度大時易泌水，水泥中C3A含量低易泌水，水泥標準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. 低標號水泥比高標號水泥的混凝土易泌水（同摻量）。 同等級混凝土，高標號水泥的混凝土比低標號水泥的混凝土更易泌水。 單位用量偏大的混凝土易泌水、離析。

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. 混凝土混合物溫度過高，尤其是夏天，氣溫高，水化反應(yīng)快，塌落度損失大。 強度等級低的混凝土易出現(xiàn)泌水。砂率小的混凝土易出現(xiàn)泌水、離析現(xiàn)象。連續(xù)粒徑碎石的砼泌水小；

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. 混凝土外加劑的保水性、增稠性、引氣性差的混凝土易出現(xiàn)泌水。超量摻混凝土外加劑的混凝土易出現(xiàn)泌水、離析現(xiàn)象。部分型號的混凝土攪拌車攪拌性能不良，經(jīng)一定的路程的運送，初始出料時混凝土混合物發(fā)生明顯的粗骨料上浮現(xiàn)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. 自上料攪拌車攪拌筒內(nèi)有積水，裝料前未排干凈或在運送過程中，任意往攪拌筒內(nèi)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.

有問題就一定能找到問題的辦法，下面自上料攪拌車說說問題的方法：

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

1. 根本的辦法就是減少單位用水量；2. 加大砂率，選擇合理的砂率；3. 炎熱夏季，采取措施降低混凝土混合物的溫度；4. 加大水泥用量或摻適量的Ⅰ、Ⅱ級粉煤灰；5. 采用連續(xù)級配的碎石，且針片狀含量??；6. 改善混凝土外加劑性能，使其具有更好的保水。增稠性，或適量減低砼外加劑摻量（僅現(xiàn)場），攪拌站若降低混凝土外加劑摻量，又可能出現(xiàn)混凝土砼塌落損失快的新問題；7. 自上料攪拌車在卸料前，應(yīng)中、高速旋轉(zhuǎn)攪拌筒，是混凝土混合物均勻后卸料；8. 加強管理，對清洗后的攪拌車攪拌筒，須排盡積水后方可裝料。裝料后，嚴禁隨意往攪拌筒內(nèi)加水。自上料攪拌車的泌水、離析問題找準原因就很容易了！

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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