臺灣博碩士論文加值系統

石膏含量與型式對含強塑劑水泥漿流動性質之影響
研究生：陳宗揚 指導教授：郭文田
國立高雄應用科技大學土木工程與防災科技研究所
摘要
水泥製造過程中常添加石膏用以調整凝結時間，其添加量對水泥之性質有相當之影響，此外熟料加入石膏一同研磨時，若熟料溫度過高會使二水石膏脫水為半水石膏或無水石膏，不同型態石膏溶解速率不同，常造成水泥不正常的凝結。一般為了改善混凝土之工作性常添加強塑劑，而市面上之強塑劑其成分及特性差異頗大，其與水泥中石膏作用時之水化行為尚未完全了解。因此本研究以熟料中添加不同比例之二水石膏、半水石膏及無水石膏，並添加不同種類強塑劑，利用Brookfield黏滯度，Mini slump坍流面積，Marsh cone流動時間，SEM微觀結構分析，凝結時間及浮水之量測，探討不同型式石膏及含量對水泥漿流動性之影響。
研究結果顯示，石膏含量愈高其與C3A作用形成之水化產物愈多，佔據強塑劑分子之吸附位置，強塑劑吸附量降低，使得漿體流動性降低，凝結時間縮短。即水泥漿流動性大小依序為含0%、3%、6%、9%之石膏。此外水泥漿之流動性亦隨石膏溶解速率增加而下降，不同型式石膏，以半水石膏溶解速率最快，其次為無水石膏，最慢的為二水石膏。即水泥漿體中添加半水石膏流動性最差，其次為含無水石膏，而含二水石膏流動性較佳。

Effect the flowability properties of cement/superplasticizer related to the content and type of gypsum in the cement
Student: Chen , Chung-Yang Advisor: Dr. Kuo, Wen-Ten
Institute of Civil Engineering and Disaster Pervention
National Kaohsiung University of Applied Sciences
ABSTRACT
Cement commonly adds gypsum in making process for adjusting setting time. Gypsum content quite affects the property of cement, and clinker addition the gypsum grind con simultaneously. If the temperature of clinker is too high, it will turn natural gypsum into gypsum-hemihydrate or gypsum-anhydrite. Different type of gypsum causes cement exception setting since different the rate of gypsum melt. Commonly, superplasticizer (SP) is added for improving the workability of concrete. However, the compositions and properties of SP for several of brands are quite different, and the hydration behaviors of gypsum reaction to SP have not been completely understood in cement. Interaction mechanisms are studied with different SP which the content and type of gypsum are different. Material parameters of this research concern consist of viscosity, marsh cone flow time, mini slump spread areas, setting time and bleeding. The goal of this work is to highlight the role of different type and content of gypsum in the flowability properties of cement paste.
Experiment results show that the higher gypsum content reactions to C3A, the more hydration products are produced. Thus, the occupied absorption spaces of SP were increased and the amount of adsorption was decreased. The flowability properties of cement paste were reduced and the setting time was shortened simultaneously, namely, cement paste from great flowability to small flowability of cement paste are the 0 percent, 3 percent, 6 percent and 9 percent of gypsum content in turns. Furthermore, the flowability properties are decreased along with the rate of gypsum melt. From the different type of gypsums, the melt rate of gypsum-hemihydrate is the fastest, the melt rate of gypsum-anhydrite is the slower and the melt rate of natural gypsum is the slowest, namely, the flowability properties of cement paste were worst, better and best when gypsum-hemihydrate, gypsum-anhydrite and natural gypsum was added in the cement paste respectively.

中文摘要 -----------------------------------i
英文摘要 -----------------------------------ii
誌謝 ---------------------------------------iii
目錄 ---------------------------------------iv
表目錄 -------------------------------------v
圖目錄 -------------------------------------vi
一、 緒論-----------------------------------1
1.1研究動機----------------------------1
1.2研究目的----------------------------2
二、文獻回顧--------------------------------3
2.1 卜特蘭水泥之組成成份及水化特徵---- 3
2.2 卜特蘭水泥之水化反應-------------- 4
2.3 水泥水化產物之微結構---------------6
2.4 強塑劑-----------------------------8
2.4.1 強塑劑對混凝土之減水機理---------8
2.4.2 強塑劑之種類---------------------10
2.4.3 水泥與強塑劑之間的吸附行為-------11
2.5 石膏之性質及在水泥上之用途---------14
2.5.1 石膏之來源及燒製---------------- 14
2.5.2 石膏之性質---------------------- 14
2.5.3 石膏遲滯C3A急速化之機理--------- 15
2.5.4 添加石膏對水泥凝結行為之影響---- 15
2.5.5 水泥中石膏之適當量-------------- 16
2.5.6 水泥中石膏含量之取決因素-------- 17
2.6 水泥漿體之流變行為-----------------18
三、 研究方法-------------------------------32
3.1 試驗流程---------------------------32
3.2 試驗材料---------------------------32
3.3 試驗變數---------------------------33
3.4 試驗設備---------------------------33
3.5 試驗方法---------------------------34
四、 試驗結果與討論-------------------------43
4.1 前言-------------------------------43
4.2 黏度值之測定-----------------------44
4.3 Marsh cone流動時間測定-------------47
4.4 Mini slump坍流面積測定-------------50
4.5 浮水率測定------------------------ 52
4.6 凝結時間測定---------------------- 53
4.7 SEM微觀分析----------------------- 54
五、 結論與建議-----------------------------121
5.1 結論-------------------------------121
5.2 建議-------------------------------122
參考文獻 -----------------------------------123

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