Why Concrete Pump Lines Get Clogged
Most seasoned concrete pump users will tell you that pump line clogging is a problem they have encountered at some point during their concrete pumping applications. When this problem arises, it is usually because of one or a combination of the following causes: (1) an inappropriate concrete mix; (2) an issue with the pump line itself; and (3) an error caused by the pump operator. New pump users should get acquainted with these sources of pump line clogs and how to prevent them, so as to further avoid unnecessary downtime.
Inappropriate concrete mix: Before embarking on any concrete pours, it is critical for you to ensure your mix is 'pumpable'. For the mix to be 'pumpable', you must make sure the water-cement ratio is just right. If the ratio is higher than is required, you will not experience clogging problems with your pump line, but the strength of your concrete structure will be compromised. If the ratio is lower, your concrete mix will exhibit greater strength, but it will hardly be 'pumpable', thus clogging up your pump lines. Follow your cement manufacturer's instructions to make sure you add the right amounts of water when mixing ingredients.
Issue with the pump line itself: At times, the problem lies with your pump line itself. This is often the case when you are using a pump that does not have sufficient capacity to force the concrete through the entire system or when your equipment is not properly cleaned. Make sure your pump has the capacity to push the aggregate in the concrete mix, as aggregate that is too large to pass through the pump line will cause clogging. In addition, be sure to clean the pump lines immediately upon the completion of every job. This will help remove any residual concrete that may dry and harden up inside the pump lines and lead to blockages.
Error caused by pump operator: To err is human, but there are mistakes only a rookie will make. A significant number of pump line blockages occurs because the people responsible for the job are simply inexperienced. These operators will make novice mistakes, such as adding a new hose to the system once the pumping action is already underway, and this may result in clogging, especially if the internal walls of the hose are dry. To prevent this, make sure to use experienced pump operators for all your concrete pumping jobs.