In general, for concrete pumped through a pipeline, a slump in the range of 4 to 6 inches (100 to 150 mm) is often recommended.
However, it's crucial to consult with a concrete mix design professional and consider the specific requirements of your project. Pumping concrete introduces additional challenges compared to traditional placement methods, so the mix should be designed to ensure it flows smoothly through the pump and maintains its desired properties upon placement.
Always work with a qualified concrete mix designer and pump operator to determine the most suitable slump for your particular pumping conditions and project requirements.
