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題 名 | 水泥化性與減水劑種類對水泥漿體流變損失影響之研究=The Effect of Cement Chemical Component and Type of Superplasticziers on Slump Loss of Cement Paste |
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作 者 | 尹衍樑; 鄭瑞濱; 江世哲; | 書刊名 | 混凝土科技 |
卷 期 | 8:2 2014.04[民103.04] |
頁 次 | 頁22-27 |
分類號 | 440.325 |
關鍵詞 | 水泥化性; 減水劑; 水泥漿體流變; |
語 文 | 中文(Chinese) |
中文摘要 | 水泥漿體流變特性會影響新拌混凝土工作度穩定性,而水泥中化學組成成分是影響水泥漿體流變行為產生變異的重要因子。本研究針對60 組不同取樣生產的波特蘭I 型水泥,利用0.3 水灰比(w/c = 0.3)探討水泥化性與不同種類減水藥劑對於水泥漿體坍流度損失的影響。試驗結果顯示,相同化性成分水泥分別使用萘磺酸與羧酸減水劑時,使用羧酸減水劑具有較大水泥漿體初始坍流度,約高於萘磺酸減水劑試驗組約10 ~ 15%,且90 分鐘後水泥漿體坍流度損失率也較萘磺酸系試驗組小,說明萘磺酸系減水劑較容易受水泥化性之影響。試驗結果也顯示水泥化學成分中鉀、硫等因子是主要對於水泥漿體坍流度損失率呈正相關影響,欲控制水泥漿體90 分鐘後坍流度損失率小於20%(坍流直徑損失< 5 cm),水泥化學成分中鈉、鉀、硫值含量分別小於0.333%、0.784%、與2.23%。因此,當生產水泥時應管控原物料使用,有效降低水泥化學成分中鈉、鉀、硫含量應能改善新拌混凝土坍度損失現象,提升水泥材料於工程應用上的穩定性。 |
英文摘要 | The rheological property of Portland cement affects the workability of fresh concrete. The cement chemical component is one of crucial effects on change rheological property of cement paste. In this study, over 60 sampling Portland type I cement, and the cement paste made by w/c=0.3 were used to investigate on the cement chemical components / type of superplasticizers with slump loss of cement paste. Test result shows that the cement paste made with Polycarboxylate superplasticizer (PCA) have higher fluidity during the first minutes and lower slump loss in 90 minutes than the cement paste made with polynaphthalene sulfonate superplasticizer (PNS). It indicates that the polynaphthalene sulfonate superplasticizer used in cement paste is lower compatibility, and the cement paste rheological property is high affected by cement chemical component. The slump loss increases with the increasing the content of sodium oxide, Potassium oxide, and sulfate oxide of cement. The optimum content of sodium oxide, Po-tassium oxide, and sulfate oxide for the slump loss within 20% in 90 minutes should be controlled lower than 0.333%,0.784%, and 2.23%, respectively. |
本系統中英文摘要資訊取自各篇刊載內容。