添加爐石及鋼纖維對改善鋼筋混凝土劣化效益之研究

The Improvement of Degradation by Adding Slag and Steel Fiber in Reinforced Concrete

常態下鋼筋混凝土是一種相當耐久的材料，但也很容易受到外在環境影響產生劣化，進而縮短其服務壽命，為此本研究設計0.4強度水膠比之混凝土，並於混凝土中添加爐石、鋼纖維等不同摻料於混凝土中，經養護28天完成後，浸泡人工海水70天與反覆載重以模擬劣化環境，之後再進行一連串巨微觀及化學性分析與電學量測分析，用以檢驗各種摻料對劣化環境下混凝土的抗劣化之成效。研究結果顯示：有添加爐石者因其產生卜作嵐效應，使品質大大提昇，因此使有害物質不易滲入腐蝕鋼筋，而添加鋼纖維可改善混凝土，並具有犧牲陽極保護鋼筋之功效，但須注意其工作性問題。

Concrete is a durable material in normal circumstance. Also easily degraded by external environment, and hence its service period is shortened. This research is to study concrete in watertobinder ratio of 0.4, That is also mixed with different materials such as slag and steel fiber. After 28-day curing, 70 days of soaking in artificial brine and repeated loading that stimulates degrading environment, a succession of macroscopic and microcosmic chemical analysis can be processed and electricity can be measured. The result shows that by adding slag can trigger pozzolan effect that greatly improves concrete quality. This can also prevent harmful matter to permeate into RC and to corrode steel. The addition of steel fiber can improve the toughness of concrete as expected, but it also may scarify itself to protect the embedded steel reinforced bar. However, it may reduce the workability of concrete.