不同醇類製成之丙烯酸酯對水泥基材的改質成效研究

A study on preparation and results of the PAE modifying cementitious materials with different alcohol.

謝孟勳(Meng-Hsun Hsieh)

指導教授 ： 李釗

國立中央大學/工學院/土木工程學系/碩士(2008年)

摘要

高分子聚合物近年來廣泛應用於水泥基材以改善其性能，然其成效上仍有工作性差、耐久性不佳及成本較高等缺點，使得聚合物發展受限。因此，如何研製新型聚合物以克服前述不利因素，將有助於擴大聚合物改質水泥基材之應用範圍。
本研究在考量成本及施工條件影響最小情況下，透過有利工作性之丙烯酸聚合物與乙醇、乙二醇、二乙二醇、月桂醇及硬脂醇等5種醇類進行酯化反應。在考量聚合物組成成分、劑量的添加及相容性情況下，製作丙烯酸酯聚合物(Polyacrylic ester , PAE)，並針對丙烯酸酯組成成分及添加量對聚合物改質水泥基材的流動性、物理性質、力學性質、耐久性及孔隙結構等方面進行評估。綜合評估試驗結果，乙二醇反應生成之丙烯酸酯聚合物，其改質成效為5種醇類最佳，且乙二醇反應生成之丙烯酸酯聚合物又以酸、醇莫爾比為0.2時，成效最佳。新拌性質方面，隨聚合物添加量增加，水泥基材流動性亦隨之增加；硬固性質則以聚合物添加量0.1%為最佳，抗壓強度相較控制組可提升7~12%，吸水率、抗彎強度、黏結強度亦較控制組優良。此外，快速氯離子穿透試驗結果顯示丙烯酸酯聚合物的添加降低了水泥基材的氯離子穿透量； SEM觀測也顯示硬固後的聚合物改質水泥基材於孔隙結構形成薄膜，有助於提升混凝土之耐久性。但由於本研究在應用上，僅進行特定試驗及針對Ⅰ型波特蘭水泥進行改質，因此仍需更多資料，以評估其整體性質。

關鍵字

丙烯酸酯聚合物 ； 水泥基材 ； 酯化反應

並列摘要

In recent years, polymer has been used for modifying cementitious materials widely in order to improve its performance. However, the polymer-modified cementitious materials still have many shortcomings, such as low workability, poor durability and high costs. In order to improve the above-mentioned defects of the polymer-modified cementitious materials, studying and making a new kind of polymer is important.
Taking the expense and the construction condition into consideration and making the least influence on the research, we used different ethanol, ethylene glycol, diethylene glycol, lauryl alcohol and stearyl alcohol to carry on the etherification in this research. The Polyacrylic ester (PAE) was made under the consideration of the components, the dosage increase and the compatible situation. The polymer-modified cementitious materials were executed to evaluate the properties of flowability, mechanics, durability and pore structure with various PAE composition and dosages. The test results showed that the Polyacrylic ester (PAE) which was made from five species of ethylene glycol had the best effect, and that the optimum conditions of the reaction were determined according to the molar ratio of acrylic acid to ethylene glycol by 1: 0.2. As far as the workability was concerned, the flowability was increased by adding the amount of PAE. As to the hardened property, if PAE was dosed with 0.1% by weight of cement, the compressive strength of polymer-modified cementitious materials could improve up to 7％~12％ of the OPC. The polymer-modified cementitious materials would make better water absorption, flexural strength and adhesion strength. Besides, the penetration of polymer modified concrete was lowered by adding RCPT. SEM micrographs showed that hardened Polymer formed the film layers in the cement-based composites. This sealed structure helped to improve the durability of the cementitious materials. But in this research, we only used typeⅠPortland cement to proceed experiments, so it still needed more information to evaluate the whole effects.

並列關鍵字

esterification ； cementitious materials ； Polyacrylic ester

參考文獻

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