臺灣博碩士論文加值系統

本研究係以不銹鋼還原碴為基材，以5種不同取代量0、5、10、15及20%取代水泥製成混凝土，其坍度會隨著取代量提高而上升有效提升工作性，再製成∅10×20cm混凝土圓柱試體，養護至齡期1、3、7、28及56天後進行硬固及耐久性試驗，硬固性質由抗壓及劈裂強度作為判斷不銹鋼還原碴是否適用於一般配比設計及工程材料，再輔以超音波波速檢測其波速變化與抗壓強度是否有一致的趨勢並評估混凝土內部緻密程度，檢測表面電阻作為表面孔隙率之依據，以熱壓膨脹、耐硫酸鹽侵蝕及高溫火害試驗觀測材料在具備膨脹性質情況下，於高壓、高侵蝕及高溫環境中能否在耐久性方面對混凝土產生正面影響。
結果顯示，齡期28天之不銹鋼還原碴混凝土抗壓強度皆達到27.44MPa(約280kgf/m3)，劈裂強度為12.81MPa ~15.34MPa，顯示強度隨著取代量提升而降低，且抗壓及抗劈裂強度間具有良好關係;超音波波速成長狀況為4762m/s~4361m/s，與抗壓強度之R2皆達0.9以上，顯示各取代量皆能達到較佳的緻密性，且與抗壓強度有相似的成長趨勢;表面電阻為10kΩ-cm~9kΩ-cm，皆低於20 kΩ-cm，顯示表面孔隙率及因取代量產生的變化幅度不大。
耐久性質方面，高溫200℃火害在質量、抗壓強度及電阻值方面具有催化效果，但超音波波速降低，高溫600℃及800℃火害後，重量變化分別為-1.8%~-4.5%及-3%~-7.1%，抗壓強度分別降低48%~57%及76%~85%，齡期7天部分取代量之波速無法傳遞，顯示溫度越高對混凝土影響越大，且早齡期之抵抗效果不佳;耐硫酸鹽侵蝕結果顯示，浸泡過程中所形成的結晶會累積於混凝土孔隙中並撐裂混凝土，在循環前期高取代量使混凝土不易產生剝落，至第五次循環後累積重量皆高於控制組;在熱壓膨脹試驗中，齡期56天取代量10%之膨脹量為0.059%，相較於齡期28天增加0.007%，顯示齡期愈久膨脹量愈大而取代量10%之膨脹量皆未超出規範值。從斷面孔隙率顯示600℃及800℃高溫對混凝土結構造成不可逆的破壞，硫酸鹽侵蝕次之，而取代量越大對孔隙率影響越大。

This study is based on stainless steel reducing slag and replaces cement with 5 different substitutions(0%、5%、10%、15%、20%) to make concrete. The slump will increase as the amount of substitution increases, effectively improving workability. A concrete cylindrical specimen make in size of ∅10×20cm was prepared and cured to a hardness and durability properties after 1、3、7、28、56 days of ageing. The hardness properties is determined by the compressive and splitting strength as a basis for judging whether stainless steel is suitable for general proportion design and engineering materials. The ultrasonic wave velocity is used to detect whether the wave velocity change and the compressive strength are consistent, so as to evaluate the internal compactness of the concrete and detect the surface resistance as the basis of the surface porosity. The autoclave test, sulfate-resistant and high-temperature fire damage tests can predict the materials positive impact on concrete in high-pressure, high-erosion and high-temperature environments.
The results show that the stainless steel reduction concrete with the age of 28 days has a compressive strength of 34.6MPa~27.65MPa with the substitution amount, which is 27.44MPa (about 280kgf/m3) and the splitting strength is 15.34MPa~12.81MPa. The ratio is 44~47, indicating that the strength decreases with the increase of the substitution amount and has a good relationship between the compressive strength and the splitting strength. At this time, the ultrasonic wave velocity growth condition is 4762m/s~4361m/s, and the R2 of the compressive strength is 0.9 or more, which shows that the density of each substitution can achieve better compactness and similar growth trend with compressive strength. The surface resistance is 9.87kΩ-cm~9.08 kΩ-cm, which shows that the surface porosity and the variation due to the substitution amount are not large.
In terms of durability, the high temperature 200 °C fire damage has catalytic effect on quality, compressive strength and electrical resistance, but the ultrasonic wave velocity is reduced. After the high temperature 600℃ and 800℃ fire damage, the weight change is -1.8%~-4.5% and -3%~-7.1%, compressive strength decreased by 48%~57% and 76%~85%, respectively. The ultrasonic wave velocity cannot be transmitted under the partial replacement of 7 days of age, indicating that the higher the temperature, the greater the influence on the concrete and the poor resistance in the early age. The results of sulfate attack resistance show that the crystal formed during the soaking process will accumulate in the concrete pores and crack the concrete. The high substitution in the early stage of the cycle will make the concrete less likely to spall, and the cumulative weight will be higher than the control group after the fifth cycle. In the autoclave test, the expansion amount of 10% of the substitution amount of 56 days is 0.059%, which is 0.007% higher than that of the 28th day of age. It shows that the longer the age, the larger the expansion and the expansion of the replacement amount of 10%. The quantity does not exceed the specification value. The porosity of the section shows that 600℃ and 800℃ high temperature cause irreversible damage to the concrete structure, followed by sulfate erosion, and the greater the substitution amount, the greater the influence on the porosity.

摘 要
Abstract
誌謝
目錄
表目錄
圖目錄
第一章 緒論
1.1研究動機
1.2研究目的
1.3研究內容
1.4研究流程
第二章 文獻回顧
2.1 不銹鋼還原碴產業及性質
2.1.1 產業近況
2.1.2 爐碴製程
2.1.3 不銹鋼還原碴成分
2.2 不銹鋼氧化碴特性及應用
2.2.1化學成分
2.2.2安定化
2.2.3製成自充填混凝土
2.3 不銹鋼還原碴相關研究成果
2.3.1製成水泥砂漿
2.3.2製成自充填混凝土
2.3.3製成RMSM
2.4 影響混凝土耐久性之可能因素
2.4.1膨脹因子對混凝土影響
2.4.2硫酸鹽侵蝕對混凝土影響
2.4.3高溫對混凝土影響
第三章 試驗計畫
3.1試驗材料
3.2試驗變數
3.3配比設計
3.4試驗項目
3.4.1 新拌性質
3.4.2 硬固性質
3.4.3 耐久性質
3.4.4 微觀性質
第四章 結果與分析
4.1不銹鋼還原碴混凝土新拌性質
4.2不銹鋼還原碴混凝土硬固性質
4.2.1 抗壓強度
4.2.2 劈裂強度
4.2.3 抗壓強度及劈裂強度比較
4.2.4 超音波波速
4.2.5 表面電阻
4.3不銹鋼還原碴混凝土耐久性質
4.3.1 高溫作用
4.3.2 耐硫酸鹽侵蝕
4.3.3 熱壓膨脹
4.4不銹鋼還原碴混凝土孔隙微觀性質
第五章 結論與建議
5-1結論
5-2建議
參考文獻
作者簡歷

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