Guide to Selecting Proportions for Pumpable Concrete
|Publication Date:||1 August 2018|
This guide addresses methods for selecting proportions specific to hydraulic-cement concrete to be placed by pumping. The primary focus of this document is to discuss the principles of mixture proportioning for normalweight and lightweight concrete. Any specific information regarding pumping equipment and field practices are covered elsewhere (ACI 304.2R). The methods provided for selecting proportions for hydraulic cement begin with an approximation of the proportions intended to be checked by trial batches in the laboratory or field, which will then be adjusted as necessary to produce the desired pumpability characteristics while confirming it meets the other performance requirements such as durability and strength. Selection of the mixture proportions should be done by considering both fresh and hardened properties required for a given application. The size of the pump and pump line should be evaluated to accommodate the volume of coarse aggregates and nominal maximum aggregate size used in the mixture. This guide does not address slump because concrete of all slumps and slump flows can be successfully pumped, provided the proper equipment and mixture proportions are used. Slump or slump flow should meet other project and application requirements, as discussed in ACI 211.1.