Category: Graduate Student Seminar Robust Methods for UHPC Early-Strength Determination and Quality Control for ABC

January 27, 2023 1:00 pm

In this quarterly Research Seminar, Mohamed A. Moustafa, Ph.D., P.E., Principal Investigator; and Mohammed S. Ibrahim, Ph.D. student, present work under the ABC-UTC research project entitled Robust Methods for UHPC Early-Strength Determination and Quality Control for ABC [ABC-UTC-2016-C4-UNR01], conducted at the University of Nevada, Reno (UNR).

Documents:
Robust Methods for UHPC Early-Strength Determination and Quality Control for ABC - pdf of presentation
Q&A Session - pdf (to be posted soon!)

Description: To take advantage of the high compressive strength of ultra-high performance concrete (UHPC), which can reach about 10 ksi after one day and about 20-22 ksi after 28 days of casting, a quality control method is needed to verify such strength at all ages. This seminar presents an assessment and development of the maturity method for UHPC as a quality control method to provide accurate strength predictions. Different UHPC mixtures, specimen shapes and sizes, fiber content, and curing regimes were adopted in this study. In addition, cube specimens were also considered for quality control methods and compared against cylinders. It is found that cubes could provide different strengths than cylinders at early ages; thus, robust conversion factors between cubes and cylinders were determined and are presented in this seminar as well.

Presenters:

 

Mohamed A. Moustafa, Ph.D., P.E.
Associate Professor
Civil and Environmental Engineering Department
University of Nevada, Reno
Email: mmoustafa@unr.edu

 

Mohammed S. Ibrahim, Ph.D. Student
(Graduated MS, Summer 2022, UNR)
Civil and Environmental Engineering Department
University of Nevada, Reno
Email: m.s.ibrahim@nevada.unr.edu

Presentation Graphics:

Figure 1. Cutting and grinding of UHPC cylinders surfaces for compression testing

 

Figure 2. Sample of tested UHPC cylinder and cube specimens under compression

 

Figure 3. Conversion factors between cubes and cylinders