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研究生： 侯威銘
Wei-Ming Hou
論文名稱： 以同步輻射解析卜作嵐反應行為及機理之研究
A Study on Pozzolanic Reaction Behavior and Mechanism by SRA
指導教授： 黃兆龍
Chao-Lung Hwang
口試委員: 沈得縣
none
林宏達
none
學位類別： 博士
Doctor
系所名稱： 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年： 2005
畢業學年度： 93
語文別： 英文
論文頁數： 77
中文關鍵詞： 爐石 、飛灰 、微結構 、卜作嵐反應 、高性能混凝土
外文關鍵詞： slag, microstructure, fly ash, HPC, pozzolanic reaction
相關次數： 點閱：325  下載：4 
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    • 本研究利用同步輻射(SRA)，核磁共振(NMR)，壓汞儀(MIP)，電子顯微鏡(SEM)，燒失法(LOI)，電阻、電滲解析含爐石，飛灰高性能混凝土複合材料微觀結構。試驗結果顯示，含飛灰水泥漿體，在早齡期時(加水後2小時內)，由[SiO2(OH)] -2離子鏈組成C2SH2(B); [SiO3(OH)]-3離子組成C2SH2(A)，Afwillite(C-S-H之一種)。由於Ca2+離子吸附於飛灰顆粒表面，產生毒化作用，降低Ca2+之濃度延遲CH成核時間，而飛灰與C3A形成C4AH13之六角形層狀保護層，延遲C3A之水化作用;故同齡期C2S、C3A、C4AF並無水化物產生。由同步輻射與ＮＭＲ、ＭＩＰ、ＳＥＭ、電阻、電滲等實驗，前後互通，巨微互証，齡期28天後，飛灰、爐石之卜作嵐反應，降低水泥漿體中之氫氧化鈣含量，封填毛細孔隙，改變複合材料微觀結構排列方式，使混凝土更均質、緻密，提升抗壓強度、阻抗力，降低滲透性，增加耐久性。

    This study tries to analyze the microstructure of HPC containing slag and fly ash, and the following methods are employed: SRA, NMR, MIP, SEM, LOI, Electrical Resistivity and Permeability. The test results show that, at the early age inside the cement paste with fly ash, [SiO2(OH)]-2 ionic bond forms C2SH2(B), and [SiO3(OH)]-3 forms C2SH2(A). Afwillite (one kind of C-S-H). Since the Ca2+ ion sticks on the surface of fly ash particle, causing the spoiling effect, the Ca2+ content is reduced and then the forming of nuclide is delayed. On the other side, fly ash and C3A can produce a hexagonal-layered protection which helps put off the hydration of C3A, and therefore there is no hydration product for C2S, C3A and C4AF. By the test of SRA and those of NMR, MIP, SEM, Electrical Resistivity and Permeability, the outcomes from macroview and microview both illustrate that the pozzalanic reaction of fly ash and slag can reduce the content of calcium hydroxide to fill the capillary porosity. Thus the microstructure order of the complex material is rearranged, and then the compression strength and resistivity are enhanced. At the same time, the permeability is reduced and more durability is gained.

    Chapter 1 Introduction 1-1 motivation…………………………………………………………………1 1-2 objectives…………………………………………………………………….1 1-3 study scope and method…………………………………………………2 Chapter 2 Literature Review 2-1 mechanism of SRA……………………………………………………………3 2-2 hydration behavior of cement paste………………………………………7 2-3 the interface weakness zone……………………………………………13 2-4 pozzolanic material…………………………………………………………15 2-5 the mechanism of fly ash and slag within the concrete…………………19 Chapter 3 Experimental Plans 3-1 test flow…………………………………………………………………………22 3-2 test materials…………………………………………………………………23 3-3 water-to-binder ratio and mixture proportion of HPC………………………24 3-4 experimental procedures………………………………………………………24 Chapter 4 Results and Analyses 4-1 SRA observation………………………………………………………………27 4-2 NMR observation…………………………………………………………37 4-3 the loss on ignition of Ca (OH)2…………………………………………42 4-4 compressive strength……………………………………………………44 4-5 MIP tests……………………………………………………………………47 4-6 SEM observation…………………………………………………………51 4-7 electrical resistance tests…………………………………………………57 4-8 electrical permeability tests………………………………………………59 4-9 permeability tests…………………………………………………………62 4-10relationship between capillary pore volume, electrical resistance, permeability and compressive strength…………………………………65 4-11The SRA test results of the cement paste with fly ash and slag are also mutually proven by the NMR, LOI, MIP and SEM tests ……………67 Chapter 5 Conclusion and Suggestion 5-1 conclusion…………………………………………………………………69 5-2 suggestion…………………………………………………………………70 REFFEENCES…………………………………………………………………71

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