藉由貯鹽試驗及鹽霧加速劣化試驗探討高強度混凝土添加鋼纖維之耐久性

何郁姍

doi:10.6342/NTU201602404

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藉由貯鹽試驗及鹽霧加速劣化試驗探討高強度混凝土添加鋼纖維之耐久性

Study of the Durability of High Strength Concrete with Steel Fiber by Ponding Test and Salt Spray Test

何郁姍 , Masters　　Advisor：廖文正　　

繁體中文 DOI： 10.6342/NTU201602404

鋼纖維高強度混凝土；貯鹽試驗；鹽霧加速劣化試驗；氯離子；擴散係數； Steel-fiber concrete ； Ponding test ； Salt spray test ； Chloride ion ； diffusion coefficient

Abstract │ Reference (144) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

High strength materials have been widely used because using high strength concrete and reinforcement can further reduce the member section, which lights the weight of the elements and increases the available space of buildings, and save materials. To solve the brittleness of high strength concrete, the addition of the steel fibers can provide more confinement and shear capacity to enhance the ductility and toughness. It also prevents the early cover spalling and solves the congestion of the transverse reinforcements in the plastic hinge region of buildings.
Although the addition of the steel fibers provides good benefit on mechanical behavior of high strength concrete, Taiwan is an island surrounded by sea with the subtropical climate, made the structures easily deteriorated by salt damage. Worried about the chloride ion may penetrate into the concrete from the interfacial transition zone (ITZ) between the steel fibers and cement paste, and therefore reduce the durability of the structures. The other hesitation is the steel fibers may easily corrode so that the steel fibers lose its advantage, inducing the steel-fiber concrete structures become weaker.
This study investigates the addition of the steel fibers influencing the durability of the high strength concrete. The experiment divides into two parts. One is using the ponding test to discuss the ITZ of the materials. According to the result, the diffusion coefficient doesn’t change between the content of steel fibers. The other is using salt spray test to simulate the structures exposing outside several years. Finally, doing mechanical experiments, such as compressive test and flexural test to evaluate the mechanical behavior after the deterioration process. According the result of the mechanical test, the strength doesn’t worsen after the deterioration by the salt spray test. 
In summary, the addition of the steel fibers doesn’t reduce the durability of high strength concrete.

Reference ( 144 ) 〈TOP〉

[1] Ahmed, S. F. U., & Maalej, M. (2009). Tensile strain hardening behaviour of hybrid steel-polyethylene fibre reinforced cementitious composites.Construction and Building Materials, 23(1), 96-106.
連結：
[3] Alonso, C., Andrade, C., Castellote, M., & Castro, P. (2000). Chloride threshold values to depassivate reinforcing bars embedded in a standardized OPC mortar. Cement and Concrete research, 30(7), 1047-1055.
連結：
[5] Andrade, C., Castelo, V., Alonso, C., & Gonzalez, J. A. (1986). The determination of the corrosion rate of steel embedded in concrete by the polarization resistance and AC impedance methods. In Corrosion effect of stray currents and the techniques for evaluating corrosion of rebars in concrete. ASTM International.
連結：
[6] Andrade, C., & Martínez, I. (2010). 14 - Techniques for measuring the corrosion rate (polarization resistance) and the corrosion potential of reinforced concrete structures, In Woodhead Publishing Series in Civil and Structural Engineering, Woodhead Publishing, Volume 2, Pages 284-316, Non-Destructive Evaluation of Reinforced Concrete Structures.
連結：
[7] Ann, K. Y., Ahn, J. H., & Ryou, J. S. (2009). The importance of chloride content at the concrete surface in assessing the time to corrosion of steel in concrete structures. Construction and Building Materials, 23(1), 239-245.
連結：

Times Cited (1) 〈TOP〉

許祖祐(2017)。具工作應力裂縫之鋼纖維混凝土梁鹽霧加速劣化後力學行為實驗設計。臺灣大學土木工程學研究所學位論文。2017。1-181。

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