博士 / 國立中興大學 / 土木工程學系所 / 100 / Anticipating potential advantages of using HBFC（high blast furnace slag cement） concrete, in 2008 Taiwan’s Dapeng Bay Bridge is a specified structural concrete for bridge upstructures, piers and abutments for protection against chloride attack. The author endorsed a proposal to carry out a research study concerning the strength development and durability of HBFC concrete. From the practical standpoint, the implications of HBFC’s mechanical interactions with the construction site environment are unknown and not well understood. An empirical study accentuating the physical interactions of concrete in the marine environment is necessary to fully understand as well as predicting its behavior over time. The experimental variables included water-to-binder ratio, curing environment, and curing duration. The impact of these variables towards the strength, microstructure, and chloride intrusion resistance are compared to OPC concrete with the identical compressive strength to evaluate its performance nonconformities. Based on the previously conducted research, the concrete mixes for the HBFC concrete have been successfully implemented to the Pen-Bay Bridge, which was completed in February of 2011. The Pen-Bay Bridge consists of cable-stayed design with a partial drawbridge allowing unrestricted maritime access to Dapeng bay. The bridge consists of an 72.9 m high single pylon, a main span of 155 m, and a side span of 55 m.
This study is incorporated with the cable-stayed bridge construction in southern Taiwan coast, is to relate the mechanical, porosity and durability properties of the high blast furnace slag cement (HBFC) concrete and the conventional ordinary Portland cement (OPC) concrete based on submerged of specimens in a sea water tank and natural exposure in the marine atmosphere zone near the construction area. Compressive strength and splitting strength at 4, 7, 28, 90, 180and 360 days, the porosity ratio at 28, 90, 180 and 360 days and the chloride penetration into concrete at 90, 180and 360 days, the microhardness at 28, 90, 180 and 360 days, the neutralization at 360 day were investigated. The high blast furnace slag cement (HBFC) used ground granulated blast furnace slag (GGBFS) as cement replacement for 45%. The variables considered include cement type, total binder content (400–475 kg/m3), water/binder (W/B) ratio (0.33,0.34,0.36) and exposure environment. The amount of GGBFS as cement replacement yielded lower compressive strengths in the early age. The results show that chlorides accumulated into concrete strongly decreases in the HBFC concrete than the OPC concrete and the inferior quality of the compressive strength in the HBFC concrete is more obviously than the OPC concrete for specimens curing in the sea water tank. The mechanical properties are affected by the cement type and curing regime. Results clearly indicated that the HBFC and a low W/B ratio would yield good chloride resistance in concrete under submerged of specimens in a seawater tank environment.
| Identifer | oai:union.ndltd.org:TW/100NCHU5015098 |
| Date | January 2012 |
| Creators | Shao-Shiang Huang, 黃紹翔 |
| Contributors | 陳豪吉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 147 |
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