During the transportation and spraying process of mortar, various reasons may cause mortar blockage in the pipes. So how much do you know about the reasons for the blockage of mortar mechanical spraying pipes? Blocking of pipes is basically caused by several reasons, such as problems with mortar formulation, mortar segregation and prolonged residence in the pipeline, high working pressure, and so on.

1、 The phenomenon of pipe blockage caused by mortar formula problems.

The blockage of the mortar formula usually occurs in the early stages of use. Due to the lack of fluidity of the mortar, the friction force during the flow of the mortar in the conveying pipe is too high, resulting in pipe blockage. This phenomenon of pipe blockage usually occurs when the batch of mortar is first used. The solution can be to adjust the variety or dosage of the admixture, and at the same time, by adjusting the cementitious material, good fluidity can be obtained. After adjustment, experimental verification should be conducted to meet not only the mechanical spraying performance but also the product quality index requirements and mortar cost control.

2、 Blocking caused by mortar segregation phenomenon.

The blockage caused by mortar segregation generally occurs during spraying construction, mainly due to the segregation of mortar at the bottom of the mortar bulk tank, resulting in changes in the properties of the mortar material. The preventive measure is to control the storage allowance of the bulk tank. When the storage amount of mortar at the bottom of the bulk tank is too low, it should be stopped from use. For the mortar that has already produced segregation, it can be tried to increase the viscosity of the mortar appropriately for bottom spraying.

3、 Mortar stays in the pipeline for too long, resulting in pipe blockage.

The main reason for pipe blockage caused by mortar staying in the pipeline for too long is that the mortar has an initial setting phenomenon due to the long static time of the mortar, which leads to a decrease in fluidity and causes pipe blockage. The main control method is to minimize downtime as much as possible. If it is necessary to shut down for a long time, the remaining mortar in the equipment should be used up first, and then the shutdown and pipeline cleaning should be carried out.

4、 Excessive pressure during mortar transportation and spraying can cause pipe blockage.

During the transportation and spraying of mortar, excessive pressure can lead to pipe blockage. In addition to issues such as mortar formula and segregation, the main reasons for the increase in pressure are also several factors. One is that the transportation distance is too far and the height is too high, causing the pressure to increase. The other is that the foreign object at the gun mouth of the spraying equipment blocks the pressure inside the mortar pipeline, causing pressure bleeding of the mortar inside the pipeline. This usually occurs at the outlet of the mortar pipeline. As the pressure increases, some water in the mortar is secreted through the outlet. If there is a problem with the sealing of the joint of the mortar pipeline, it can also cause mortar bleeding at the interface, resulting in pipe blockage. The blockage of pipes in this phenomenon is usually preceded by a significant decrease in the amount of mortar conveyed and sprayed, while the working pressure gradually increases. In this case, the operator must stop using the equipment in a timely manner. Otherwise, as the pressure continues to increase, the bleeding of mortar pressure will intensify, leading to more serious blockage. If the machine is stopped for inspection in a timely manner, the blockage usually only occurs at the discharge port end, and cleaning is relatively simple.

I hope our analysis of the causes of pipe blockage in mortar mechanical spraying can be helpful to everyone, and we can promptly address these issues when such situations occur during daily mortar mechanical spraying construction.

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