What happens if the fully automatic mixer truck lacks mixing time? In fact, if the mixing time of the fully automatic mixer truck is insufficient, it will lead to the loss of uniformity of the concrete, that is, the raw materials such as cement, sand, and stones in the concrete are not fully mixed, which can lead to problems such as reduced concrete strength, increased bleeding rate, hollowing, and cracks.
If the concrete strength is insufficient, it may affect the load-bearing capacity and safety of the building. In addition, insufficient mixing time can also affect the quality of concrete, making uneven concrete unable to meet construction requirements, affecting construction progress and building quality.
Therefore, it is necessary to set the mixing time reasonably based on factors such as the concrete mix ratio, mixing machine type, and mixing speed, to ensure sufficient mixing of concrete, construction quality, and building safety.
It is prohibited to shorten the mixing time without a bottom line. It is recommended to use a single method of setting the mixing time. According to the national standard GB/T14902-2012 "Ready Mixed Concrete", the mixing time of concrete in the mixer should not be less than 30 seconds. According to the national standard GB50164-2011 "Concrete Quality Control Standard", the short mixing time for concrete is 60 seconds. At the same time, it is stipulated that a dual horizontal shaft forced mixer can appropriately shorten the mixing time while ensuring uniformity. According to the above two standards, the concrete mixing time should not be less than 30 seconds.
Many people reduce production costs by continuously reducing mixing time, some of which only take 15s or 20s. The operators are mostly young people. By reducing mixing time, reducing operation time, reducing work intensity, and increasing rest time, this is one of the reasons for the continuous deterioration of concrete quality. Some operators infer the state of concrete based on the mixing current, completely ignoring that different types of concrete require different mixing times. All concrete is considered based on a certain mixing time, and when the mixing current is too high, water will be added. Some concrete requires a longer mixing time. When the mixing time is set to be short, the mixing current is too high. Once the water is added and the current is appropriate, the concrete strength will be lost greatly, which will cause engineering accidents.
In actual production, there are many factors that affect the mixing time. Concrete with different strength grades requires different mixing times; The thickness of concrete varies, and the mixing time varies; Concrete of the same strength grade has different construction sites and mixing times; For concrete of the same strength grade, the admixtures are different, especially after adding powder, the mixing time is different; The mixing time of normal temperature concrete is different from that of winter; The size of the stones varies, and the mixing time varies; The amount of stones varies, and the mixing time varies.
The mixing time should be set in the mix proportion sheet, with a single setting and priority given to the mixing time specified in the mix proportion sheet. Welcome to our website anytime http://www.zkzsljbc.com Consult for more matters!