Details:

Creators:
Malloy, Joe ; Sim, Chungwook  ; Tian, Ying ; Hu, Jiong
Malloy, Joe ; Sim, Chungwook  ; Tian, Ying ; Hu, Jiong Less -
Corporate Creators:
University of Nebraska-Lincoln. Department of Civil and Environmental Engineering
Corporate Contributors:
Nevada. Department of Transportation
Subject/TRT Terms:
[+]
Bridge Decks Bridge Design Economic Efficiency Fiber Reinforced Concrete Mix Design Specifications Super High-Performance Concrete
Publication/ Report Number:
P366-16-803
Resource Type:
Tech Report
Geographical Coverage:
Nevada ; United States
Nevada ; United States Less -
Edition:
Final Report
Corporate Publisher:
Nevada. Dept. of Transportation
Abstract:
The project stated with an extensive summary of construction practices and experiences from different state agencies. Besides, a detailed summary of state DOT specifications was included in the report. The main objective of this study was to develop a mix design adjustment method for High-Performance Fiber Reinforced Concrete (FRC) that would maintain appropriate workability while improving hardened concrete performance. A literature review was conducted to examine existing methods for adjusting mix designs to account for fiber introduction. It was found that while increasing fine aggregate and cement paste content can make up for lost workability with the addition of fibers, no rational mix design adjustment method is available. Reference mix designs from the Nevada Department of Transportation and the Nebraska Department of Transportation were used, and this study focused on tailoring the mix design based on the parameter of excess paste. Excess paste serves to coat the aggregate particles and is critical for workability. To apply this method, a modified version of ASTM C29 was used to determine the void content of fiber-aggregate skeletons with varying fiber contents. Paste and fine aggregate content were then adjusted to maintain the excess paste quantity between reference mixes and mixes with fiber. A variety of tests, including slump, vibrated L-box, compressive strength, splitting tensile strength, flexural strength, drying shrinkage, and restrained shrinkage were conducted to evaluate the overall concrete performance. Results indicated that, for each mix design, adjusting based on excess paste provided a workable FRC with improved hardened performance. Eight slabs were then prepared for a large-scale examination of the constructability and mechanical behavior of the developed FRC. Throughout the study of FRC, an alternative concrete to Ultra-High Performance Concrete (UHPC) that would considerably outperform High-Performance Concrete (HPC) was developed. This study delves into the development of a new type of concrete called Super High-Performance Concrete (SHPC). SHPC is a high strength, self-consolidating HPFRC that would significantly cut back on cost and production limitations compared to UHPC as it can be produced with conventional drum-type mixers. Results indicate that SHPC outperforms HPC in matters of workability, compressive strength, flexural strength, and toughness and could potentially be a viable alternative of UHPC for applications such as bridge deck connections and overlays. The report also included detailed recommendations regarding the mix design, batching and mixing, quality control methods, and casting of HPFRC and SHPC that can be further used in the development of specifications for NDOT.
Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:f39bb77cbf186e5a2db649ba66af1d00b5d9fcfc87dc1129af9ea6ece3f7dc84
Download URL:
https://rosap.ntl.bts.gov/view/dot/64339/dot_64339_DS1.pdf
File Type:

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