Why can\t I pour the concrete rather than place it?
Normal concrete is designed with a certain workability, which means it can be conveyed to the pour site using smooth rounded chutes and still maintain its composition and not segregate. Adding more water to make it pourable or looser usually causes segregation, not to mention the adverse effects of the additional water on the strength of the concrete, slower setting times and increased cracking. To make concrete more flowable or “pourable”, without adversely affecting the concrete, one would add a chemical admixture such as a mid range water reducer. Here again there is a limit to the amount that can be added before the concrete begins to segregate.
