The greater characteristic of concrete mixer is that it is temporary and serves specific concrete engineering in a specific time. However, some concrete projects are prone to quality problems, which also have a great impact on the progress of the project and economic benefits. Therefore, the quality control of concrete mixer is very necessary.

　　，混凝土配合比要保证混凝土有良好的工作性能，比如可泵性、大流动性、自密实性等。要满足工程结构物强度、耐久性及其他特别设计要求。混凝土在配合比设计中要积极合理应用减水剂等混凝土外加剂，以减少混凝土用水量，降低水胶比，提高混凝土强度。在混凝土中适量掺加粉煤灰、矿粉等外掺料，取代部分水泥和部分细骨料，在保证混凝土强度等级与工作性能要求下，可以显着提高混凝土的密实性，增加对钢筋的保护作用，同时降低混凝土经济成本。

　　First of all, the concrete mix proportion should ensure that the concrete has good working performance, such as pumpability, large fluidity, self compacting and so on. It should meet the strength, durability and other special design requirements of engineering structures. In the mix proportion design of concrete, water reducing agent and other concrete admixtures should be actively and reasonably used to reduce the water consumption of concrete, reduce the water binder ratio and improve the concrete strength. Adding high-quality fly ash, mineral powder and other admixtures in concrete to replace part of cement and part of fine aggregate can significantly improve the compactness of concrete, increase the protection of reinforcement and reduce the economic cost of concrete.
      

　　其次，混凝土搅拌机原材料的管理要加强，砂、石料场要有良好的排水设施，以免底部积水。水泥、粉煤灰等粉料仓要有防潮、防雨措施。砂石料按品种、规格分隔堆放，避免混料。各种材料要标识清楚，特别是水泥、粉煤灰筒仓、外加剂贮存仓等进料口要加盖标识，专人管理，以防止进错料或受污染。

　　Secondly, the management of raw materials of concrete mixer should be strengthened. Sand and stone yards should have good drainage facilities to avoid water accumulation at the bottom. Moisture proof and rainproof measures shall be taken for cement, fly ash and other powder silos. Sand and stone materials shall be stacked separately according to varieties and specifications to avoid mixing. All kinds of materials should be clearly marked, especially the cement, fly ash silo, additive storage bin and other feeding outlets should be marked and managed by special personnel to prevent wrong feeding or contamination.

　　混凝土搅拌机能够加快施工进度、减少环境污染、改善施工条件、提高工程质量和节约材料成本。但是，混凝土搅拌机的质量控制也是不可遗漏的要点。

　　Concrete mixer can speed up the construction progress, reduce environmental pollution, improve construction conditions, improve project quality and save material cost. However, the quality control of concrete mixer is also an important point.