Title: Concrete Q&A: Adjusting Air Content On-Site

Author(s):

Publication: Concrete International

Volume: 43

Issue: 10

Appears on pages(s): 72

Keywords: limit, addition, time, delivery

DOI:

Date: 10/1/2021

Abstract:
This month’s Q&A deals with additions of air-entraining agent at a jobsite for concretes delivered with air content lower than specified on a project. It discusses relevant information provided in ACI 301-20 and ASTM C94/C94M-21a as well as limits on the number of revolutions and time to the end of discharge as currently specified in ASTM C94/C94M. The Q&A also includes a paragraph on testing and accepting air content in pumped concrete.