Thesis
Interfacial properties of chemical bonded phosphate ceramics and sugar maple (Acer saccharum)
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/100674
Abstract
The research within this thesis focused on the interfacial bond between magnesium phosphate ceramics (MPCs) and sugar maple (Acer saccharum). A pull-out test method was investigated and utilized for evaluating the interfacial mechanical properties. A variety of aggregates and binder component ratios were incorporated into MPC formulations that were evaluated for their bond performance with wood. A 3:1 weight ratio of monopotassium phosphate (MKP) and magnesium oxide (MgO), the binder system, was found to have the best binder performance. A Mixture Design model was used to understand the influence the levels of MPC binder, and aggregates; Portland cement, wollastonite and VCAS, had on the interfacial properties. The statistical results show that MPC binder level is the primary factor which influences the interfacial properties, while wollastonite and VCAS can mutually promote the interfacial property. But the bond strength is decreased when Portland cement is mixed with the two other aggregates. Polyvinyl alcohol (PVA) fiber was used as a reinforcement of the MPC and was also found to influence the interfacial strength of MPC with maple. The interfacial mechanical properties with the maple dowel rods are enhanced by PVA in a wollastonitebased MPC but a decrease was seen in cement-MPC/maple and VCAS-MPC/maple. Treatments of 90% RH conditioning and water immersion were utilized to evaluate the environmental durability of MPCs. The type of aggregates utilized in the MPCs exhibit different moisture durability performance; the VCAS-MPC/maple has very poor moisture performance, while the Portland cement-MPC/maple and wollastonite-MPC/maple had reduced had reduced interfacial shear stress, but still maintained bond integrity unlike the VCAS based MPC.
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Details
- Title
- Interfacial properties of chemical bonded phosphate ceramics and sugar maple (Acer saccharum)
- Creators
- Hengxuan Chi
- Contributors
- Karl R. Englund (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525158401842
- Language
- English
- Resource Type
- Thesis