臺灣博碩士論文加值系統

本研究是以不同比例的一型水泥與硫鋁酸鹽水泥混合，研究製作裂縫注入劑的可行性。目標在於找出能夠滿足歐盟EN1504-5規範中規定，通過時間能夠在8分鐘以內，並且28天劈裂強度超過3MPa之配比。實驗方法包括了通過時間試驗、劈裂強度試驗、漿體黏度試驗、砂漿抗壓試驗、砂漿長度變化率試驗。
由研究成果發現，水膠比0.475，一型水泥佔80%，硫鋁酸鹽水泥佔20%之配比可以達到目標。該配比所得到的劈裂強度，甚至比單純使用一型水泥之漿體來得高。由不同段落的劈裂強度值，可以發現混合水泥可能有淅離現象發生。由黏度試驗發現，當硫鋁酸鹽水泥量增加時，漿體的初始黏度下降，這與通過性試驗結果相左。發生相左的原因，可能是因為混合水泥配比中並沒有對硫鋁酸鹽水泥有效的分散劑，所以當硫鋁酸鹽水泥量增加，會發生團簇、絮凝等現象，進而造成阻塞。由砂漿抗壓試驗發現，當養護條件可以保證水分充足時，單純使用一型水泥的砂漿強度最好。而一型水泥用量接近一半時，強度最低。由砂漿長度變化率試驗發現，硫鋁酸鹽水泥用量增加，混合水泥砂漿的收縮量就越低。

Different proportions of type I cement and calcium sufoaluminate cement in blended cement system for manufacturing the cement-based crack injection material were investigated. The goal of this study is to find appropriate mixtures such that the passing time requirement (maximum 8 minutes) in EN-1504 and the 28-d splitting tensile strength exceeding 3 MPa can be achieved. The experiments conducted include the injection capability test (passing time), the splitting tensile strength test, the viscosity test, the compressive strength test of mortar cubes and the length change percentage test. Results show that the mixture with w/c=0.475, the weight of type cement in blended cement equal to 80% and the weight of sulphoaluminate cement equal to 20% can match the goal. The splitting tensile strength of this mixture even exceed that using 100% type I cement. From the splitting strength values for different locations, the blended cement might have segregation phenomenon. From the results of viscosity test, it is found that when the content of sulphoaluminate cement increases, the initial viscosity of grout decreases, which is inconsistent with the results for injection capability test. The reason for inconsistency comes from that no appropriate dispersant for sulphoaluminate cement exists such that the balling effect or flocculation might happen and consequently results in sag especially when the content of sulphoaluminate cement increases. From the compressive strength test, it is found when the curing environment can guarantee enough water then compressive strength for specimens using 100% type I cement is highest. When the amount of type I cement near one half, the compressive strength reaches minimum value. From the length change test, it is found that when the content of sulphoaluminate cement is higher, the contraction of mortar is less significant.

中文摘要 I
ABSTRACT II
目錄 III
圖目錄 V
表目錄 VI
第一章 緒論 1
1-1 研究動機 1
1-2 研究目的 2
1-3 研究方法與流程 3
第二章 文獻回顧 4
2-1 前言 4
2-2 材料 4
2-2-1 水泥 4
2-2-2 硫鋁酸鹽水泥 5
2-3 鋼筋混凝土劣化原因 5
2-3-1 混凝土劣化原因[1] 5
2-3-2 裂縫成因 8
2-3-3 裂縫種類 8
2-3-4 容許裂縫寬度 9
2-4 鋼筋混凝土結構物的修補 10
2-4-1 修補材料 10
2-4-2 修補材料性質 11
2-5 裂縫修補 12
2-6 有關裂縫修補的研究 17
第三章 試驗計畫 18
3-1 前言 18
3-2 試驗變數 18
3-3 試驗材料 18
3-4 配比編號與設計 22
3-4-1 配比編號 22
3-4-2 注入漿體配比設計 23
3-5 試驗方法 24
3-5-1 注入性試驗漿體拌合流程 24
3-5-2 注入性試驗 24
3-5-3 劈裂試驗 28
3-5-4 黏度試驗 30
3-5-5 砂漿抗壓試驗 31
3-5-6 砂漿長度變化試驗 31
第四章 試驗結果與分析 33
4-1 先期試驗結果 33
4-2 注入性試驗(水膠比0.475) 34
4-3 劈裂強度試驗(水膠比0.475) 36
4-4 黏度試驗(水膠比0.475) 39
4-5 砂漿抗壓強度試驗(水膠比0.475) 41
4-6 砂漿長度變化率試驗(水膠比0.475) 43
4-7 混合水泥漿體產生淅離的探討 45
第五章 結論與建議 47
5-1結論 47
5-2建議 47
參考文獻 48
附錄 51
附錄二 再粉磨硫鋁酸鹽水泥之細度檢驗報告 52

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