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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/1110

    Title: 丙烯酸系粉體聚合物與強塑劑應用於水泥砂漿之反應影響研究
    Authors: 蕭博元;Po-Yen Xiao
    Contributors: 土木工程研究所
    Keywords: 強塑劑;強度;流度;粉體聚合物;flow;powdered polymer;superplasticizer;strength
    Date: 2007-01-10
    Issue Date: 2009-09-18 17:20:36 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 土木工程技術日新月異,在材料方面,從礦物摻料到化學摻料均可應用於水泥基材以求改善產品性質,但除了不同的摻料對產品的性質有不同的影響外,混合使用時常會顧此失彼,所以摻料的選擇、使用方法與用量,將是應用上的重要課題。 本研究在符合一般施工條件與考量混凝土工作性不佳的前提下,尋找適當粉體型態的聚合物與促進劑,與水泥混合製成粉體複合水泥,並進而探討其在新拌與硬固漿體的工程性質。另外也添加了數種強塑劑,藉以觀察其對聚合物效用的影響。 新拌漿體的試驗結果顯示粉體聚合物與促進劑的摻用具有30?60分鐘緩凝效果,同時也增加了新拌漿體的流動性,尤其是長時間(90~120分鐘)的流動性增加5~10%。其次,在部分實驗條件下,聚合物對硬固砂漿的抗彎與抗壓強度,有提升的效果;再者,亦有效減少吸水率與吸水膨脹率。另外,為了控制相同起始流度而摻入的強塑劑,種類與用量的不同會影響粉體聚合物對水泥漿體的效用。 The technique of civil engineering is being continuously updated. The usage of mineral or chemical admixtures in cement can both improve the cement properties. Besides taking into consideration the different effects of different admixtures on cement properties, the selection, application method and quantity of admixtures are also very important issues to be discussed since all factors can hardly be taken care simultaneously during mixture. Under the general requirements of practical construction and considering the unsatisfactory workability of concrete, we seek by this research a suitable powdered polymer and promoter to be mixed with cement for forming a powdered polymer-modified cement (powdered PMC), and we further look into the engineering properties of powdered PMC on fresh-mixed and hardened mortar. We have also added several superplasticizer for observing their effects on polymer. The test results of setting time on fresh-mixed mortar show that the application of powdered polymer and promoter has a 30 to 60 minute retarding effect, and at the same time it increases the flowability of fresh-mixed mortar, especially the long-period flowability (90 ~ 120 minutes) which is by 5 ~ 10%. Also, under some testing conditions, the polymer improves the flexural and compressive strength of hardened mortar. Furthermore, the absorption and sorptive expansion ratio can be improved when the polymer be added. As for the usage of superplasticizer for the control of initial flow, the different types and quantities of superplasticizer have different effect of powdered polymer on cement mortar.
    Appears in Collections:[土木工程研究所] 博碩士論文

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