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題 名 | 添加強塑劑對水泥材料水化行為之影響=Effect of Superplasticizers on the Hydration of Cement |
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作 者 | 李釗; 郭文田; | 書刊名 | 技術學刊 |
卷 期 | 14:3 1999.09[民88.09] |
頁 次 | 頁343-351 |
分類號 | 441.555 |
關鍵詞 | 強塑劑; 吸附; 水化熱; 離子濃度; Superplasticizer; Adsorption; Heat of hydration; Ionic concentration; |
語 文 | 中文(Chinese) |
中文摘要 | 強塑劑之使用,對高性能混凝土工作性及強度發展有相當大的影響。目前國內 各種強塑劑之成份、特性和分子量差異甚大,且水泥之四種主要單礦物各自有不同且複雜 的水化機理,但強塑劑與水泥水化間之相互作用機理仍未相當清楚。因此本研究藉由量測 孔隙溶液離子濃度、水化熱、凝結時間變化,配合吸附行為及X光繞射分析等試驗,以探 討SNF及SMF型強塑劑對水泥材料水化行為之影響。 研究結果顯示,添加SNF及SMF型強塑劑時,由於吸附作用將延緩水泥之水化過程, 使得凝結時間及水化放熱峰因強塑劑的添加而延緩,且使在孔隙溶液中的OH□、Ca□及K □離子濃度皆較低。水泥對SNF及SMF型強塑劑之吸附行為均屬單層吸附,低濃度時吸附量 會隨劑量之增加而增加,但當吸附飽和時,吸附量反會緩慢減少。 |
英文摘要 | The workability and the strength development of high performance concrete are hichly dependent on the addition of superplasticizer. However, the compositions, properties, and molecular weight for various brands of superplasticizers are quite different. The four major components contained in cement have complicated hydration mechanisms. The interactions between superplasticizer and cement during hydration are not fully understood. This study is to investigate the effects of SNF and SMF superplasticizers on the hydration of type 1 and type II cements. Measurements included setting time, heat of hydration, effect of adsorption characteristics of superplasticizer on cement particles, ion concentrations in the solution phase of cement paste, and X ray diffraction analysis. Test results showed that the adsorption of superplasticizer added cement particles resulted in retardation of cement hydration. The settin. time and the peak of hydration heat were delayed by the addition of superplasticizer. The concentrations of OH□, Ca□ and K□ in the solution phase of the superplasticizer added cement pastes were reduced as compared with the paste without addition of superplasticizer at the same elapsed time. The adsorption of both superplasticizers was monolaver adsorption. The amount of adsorption was increased with increasing the concentration of superplasticizer. When the adsorption had attained saturation, the amount of adsorption was decreased if the concentration of superplasticizer was further increased. |
本系統中英文摘要資訊取自各篇刊載內容。