Title:
Influence of Truck Drum Revolution Count on Fresh and Hardened Concrete Characteristics
Author(s):
Jiaming Chen and David Trejo
Publication:
Materials Journal
Volume:
113
Issue:
1
Appears on pages(s):
25-34
Keywords:
compressive strength; diffusivity; drum revolution count; extended mixing; freezing and thawing; modulus of elasticity; modulus of rupture; tensile strength; workability
DOI:
10.14359/51687978
Date:
1/1/2016
Abstract:
Most specifications for ready mixed concrete limit the truck drum revolution counts (DRCs) to 300 revolutions before discharge. These specifications have been in place for many years with the objective of ensuring the quality and performance of the finished concrete product. However, limited research has been performed to determine the validity of these limits. Because there have been significant changes in the concrete industry since these limits were first implemented by ASTM International in 1958, research is needed to determine if these limits are still applicable. Results from laboratory and field research indicate that, in most cases, extended DRCs (longer than current specification) have no detrimental effects on the mechanical properties and durability characteristics of concrete as long as the concrete exhibits adequate workability to be properly placed and cast. Results also indicate that different mixtures exhibit a wide range of slump and slump-loss values, and correlation of fresh performance; the 300 truck DRC could not be validated in this research.