In rural construction, ensuring the quality of concrete starts from the raw material ratio. Precise calculation of the raw material ratio is the foundation for stable concrete quality. For example, in general rural building construction, the ratio of cement, sand, gravel, and water needs to be calculated accurately according to the design requirements of the building structure. Usually, the cement - sand - gravel ratio might be around 1:2:3, but this can vary depending on the specific strength requirements of the concrete. Maintaining high batching accuracy can significantly reduce the probability of concrete strength not meeting the standard. For instance, an error in the cement dosage of more than 5% may lead to a decrease in concrete strength by about 10%.
The feeding sequence plays a crucial role in improving the uniformity of concrete and preventing segregation. Scientifically optimizing the feeding sequence can make the concrete components mix more evenly. Typically, the recommended feeding sequence is to first add coarse aggregates (gravel), then cement, and finally fine aggregates (sand) and water. This sequence allows the cement to be evenly wrapped around the aggregates, reducing the occurrence of segregation. If the feeding sequence is not correct, such as adding water too early, it may cause the cement to clump, resulting in uneven concrete and segregation.
Determining the appropriate mixing time is a balance between concrete strength and construction efficiency. Generally, for a small - scale rural concrete mixing operation, the initial mixing time can be set at about 2 - 3 minutes. However, this time needs to be adjusted according to the type of raw materials, the size of the mixing equipment, and the construction requirements. If the mixing time is too short, the concrete may not be fully mixed, leading to insufficient strength. On the other hand, if the mixing time is too long, it will not only waste energy but also may cause the concrete to lose its workability, affecting the construction efficiency.
Temperature has a significant impact on the performance of concrete. In rural construction, where the construction environment is often more exposed, temperature monitoring is particularly important. The optimal temperature for concrete mixing is between 20 - 25 degrees Celsius. When the temperature is too high, the concrete may set too quickly, reducing its workability. When the temperature is too low, the hydration reaction of the cement will slow down, affecting the strength development of the concrete. Therefore, real - time temperature monitoring and appropriate temperature adjustment measures are necessary, such as using warm water in cold weather or adding cooling agents in hot weather.
Intelligent control systems are becoming increasingly important in concrete mixing. These systems can monitor the mixing state in real - time, providing feedback on parameters such as rotation speed and uniformity. For example, through sensors, the intelligent control system can detect whether the concrete is evenly mixed and adjust the mixing speed accordingly. This real - time monitoring function helps operators precisely control the mixing process, ensuring the quality of concrete.
In rural construction, common concrete quality problems include insufficient strength and segregation. Insufficient strength is often caused by improper raw material ratio, short mixing time, or low - quality raw materials. Segregation is mainly due to incorrect feeding sequence, long - distance transportation without proper agitation, or improper mixing time. By analyzing the causes of these problems, operators can take corresponding improvement measures, such as adjusting the raw material ratio, optimizing the feeding sequence, and extending the mixing time appropriately.
Regular maintenance of the mixing equipment is essential to ensure the long - term stable operation of the equipment and the quality of concrete. For the mixing drum, it is recommended to clean it after every 5 - 8 batches of concrete mixing to prevent the accumulation of hardened concrete, which can affect the mixing effect. As for the bearings, they should be lubricated every 10 - 15 working days to reduce friction and wear, ensuring the smooth operation of the equipment.
For rural construction and management personnel, choosing a reliable concrete mixing equipment can greatly improve work efficiency and ensure the quality of construction projects. The Henan Guoli Mikesi AS - 2.6 intelligent concrete mixer is a great choice. This mixer is equipped with an intelligent control system, which can accurately control the mixing process, from raw material ratio to mixing time. It also has a high - quality structure design, which is easy to maintain, helping you solve the problems of concrete mixing and equipment maintenance in rural construction.
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