鋼碴粉SCC之水化行為與工程性質之研究

Study on the Hydration Behavior and Engineering Property of BOF-SCC

詹穎雯(Yin-Wen Chan) ； 李銘智(Ming-Chih Li) ； 卓世偉(Shih-Wei Cho)

《中華建築技術學刊》 7卷1期 (2010/06) Pp. 1-8

https://doi.org/10.30021/JBCT.201006.0001

摘要

本研究的目的在於探討煉鋼工業的副產物鋼碴粉應用於自充填混凝土的可行性。鋼碴粉應用於自充填混凝土中，扮演的角色為取代部分的粉體。SCC配比中，為使漿體具有足夠的黏稠性得以均勻混合粗細粒料並且達到足夠的流動能力，粉體量往往需要400 kg/立方公尺以上，而這樣的粉體用量也導致SCC的實際強度高於一般設計強度。因此，為了減少具水化反應的膠結粉體，同時降低材料成本，可考慮使用石粉等不具有水化反應的粉體來取代部分的膠結粉體。而煉鋼的副產品轉鋼碴粉則具有價格低與低水化反應的特性，因此使用高細度鋼碴粉來產製中強度SCC是具可行性的。
在本研究中，進行了一系列添加鋼碴粉的SCC配比試拌，由這些結果獲得了鋼碴粉適合的添加量，並且成功的發展出抗壓強度280 kgf/平方公分及更低強度的SCC。另一方面，亦針對鋼碴粉SCC進行基本試驗，包含新拌性質與硬固性質，並發現鋼碴粉存在微小的活性反應。最後，進行鋼碴粉SCC柱的撓曲試驗，以探討鋼碴粉SCC的結構行為，並與相同設計強度之傳統混凝土柱進行比較。

關鍵字

鋼碴粉 ； 自充填混凝土 ； 水化

並列摘要

The objective of this study is to investigate the feasibility of basic oxygen furnace Slag (BOF slag. hereafter), being a waste material from steel industry, in self-compacting concrete (SCC. hereafter). BOF slag, when applied in SCC, may play a role in partially replacing total powder content as required to achieve self-compactability of SCC. In general, at least 400 kg/m^3 of cementitious materials is required to form sufficient amount of cohesive cement paste that allows concrete to flow like fluid when mixed with coarse and fine aggregates. As a result, the compressive strength of SCC tends to be higher than required. In order to reduce the amount of total cementitious materials and the cost of materials, some inert mineral particles, such as limestone powder. have been used to develop SCC. The BOF slag is basically inactive and low-cost. It is expected that BOF slag may serve as additive tine particles as supplement of cementitious materials. Therefore, a middle-strength SCC may he manufactured in a relatively affordable cost.
In this study, a series of mix proportions of SCC incorporating BOF slag makes were trial mixed to obtain suitable BOF content in partially replacement of cementitious materials, such as cement, blast furnace slag and/or fly ash, etc. Mix proportions of SCC with specified compressive strength of 280 kgf/cm^2 (4, 000 psi) or lower were successfully developed. Furthermore, BOF slag was found to possess a minimal reactivity in the existence of cement and blast furnace slag. Some fundamental mechanical properties of SCC made of BOF slag were measured as well. Finally, a seismic design concrete column made of BOF slag SCC were tested with cyclic flexural force to examine the structural behavior of BOF slag SCC. The result of the flexural behavior of BOF slag SCC column is comparable to that of conventional concrete column with identical design strength.

並列關鍵字

Basic Oxygen Furnace Slag ； Self-compacting Concrete ； Hydration