Title:
Impact of Chemical Admixtures on Time-Dependent Workability, and Rheological Properties of UHPC
Author(s):
Jiong Hu
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/28/2021
Abstract:
Workability of ultra-high-performance concrete (UHPC) is critical to ensure success constructions and to realize the superior mechanical properties and durability of this material. Researchers have been using different methods to evaluate UHPC workability. Owing to its availability to most agencies and researchers, the most popular test method is the flow test, which can be further categorized into dynamic and static flow measurements. Agencies have been using different flow test procedures for the quality control of UHPC, yet there is no systematic study to evaluate their difference. Besides, there is a lack of fundamental understanding of the workability of UHPC based on information collected from these two procedures. This study investigated the difference between dynamic and static flow table tests with a wide range of UHPC mixes of different silica fume content, binder content, fibers, and water-to-binder ratios. Also, as the mixing process is intense and critical for UHPC production, a comparison study of mixes produced with two different mixers and the control of consistency during UHPC mixing is also presented. The comparison helps to justify if mixes developed in the laboratory are comparable to those to be used in the field production.