Master of Science / Department of Civil Engineering / Robert J. Peterman / This thesis details findings from testing done to determine bond and time-dependent
characteristics of two lightweight concrete mixes. The lightweight mixes were tested to possibly
provide a more cost-effective solution to replacing some of Kansas’ older bridges. Testing
included use of a conventional lightweight mix and a self-consolidating lightweight mix. Sixteen
Inverted T-beams were cast at a prestress plant to determine prestress losses that had occurred in
the two lightweight mixes. These losses were compared to ACI, PCI, and AASHTO code
equations. Creep and shrinkage prisms were also cast and measured to accurately determine
creep and shrinkage variables for the two lightweight mixes. Twelve flexural beams were also
cast at the prestress plant and tested at Kansas State University’s Civil Engineering Structures
Laboratory to experimentally test development lengths of the lightweight mixes and to compare
results with ACI code equations.
This study found compressive strengths of the lightweight concrete mixes varied greatly
from laboratory testing. Low concrete strengths caused the prestress losses to be greater than the
predicted code values. Flexure beam testing showed several of the beams were subject to strand
slip, causing a sudden violent failure.
| Identifer | oai:union.ndltd.org:KSU/oai:krex.k-state.edu:2097/6998 |
| Date | January 1900 |
| Creators | Holste, Joseph Robert |
| Publisher | Kansas State University |
| Source Sets | K-State Research Exchange |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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