發(fā)布時間：2018-07-04 14:05

  本文選題：聚羧酸 + 黏土��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：本論文通過對傳統(tǒng)的聚羧酸減水劑進行結(jié)構(gòu)改性,制備出了不含聚乙二醇側(cè)鏈的新型聚羧酸減水劑,提高了其對黏土的抗性。隨后研究了黏土對不同高效減水劑的性能影響,并且探討了不同高效減水劑和黏土的相互作用機理,該項研究有助于理解黏土在混凝土中的確切作用,為進一步的設(shè)計出抗黏土型高效減水劑提供了有用依據(jù)。在不同高效減水劑和黏土的相互作用機理的基礎(chǔ)上,設(shè)計出了一種陽離子型抗泥劑并且用于和傳統(tǒng)聚羧酸減水劑復(fù)配,該混合體系提高了對黏土的抗性,在混凝土骨料中含有黏土?xí)r,為傳統(tǒng)的聚羧酸減水劑提高對黏土的抗性提供了解決方案。1、一種含有叔胺基團的單體甲基丙烯酸二甲胺乙酯被引入并且和衣康酸,丙烯酸用來合成聚羧酸減水劑。該減水劑被表征并且測試了其在黏土出現(xiàn)時候?qū)λ嗟姆稚⑿?結(jié)果發(fā)現(xiàn)其比傳統(tǒng)的聚羧酸減水劑具有更好的分散水泥性能。XRD和TOC測試表明該新型聚羧酸減水劑與黏土的作用方式只是為表面的靜電作用。而傳統(tǒng)的聚羧酸減水劑與黏土的相互作用是通過表面靜電吸附以及層間化學(xué)吸附兩種作用。2、傳統(tǒng)的聚羧酸減水劑,不含聚乙二醇側(cè)鏈的聚羧酸減水劑,縮聚物高效減水劑被用來研究了它們在黏土出現(xiàn)條件下對水泥的分散性能以及它們與黏土之間的相互作用行為。結(jié)果發(fā)現(xiàn)在黏土出現(xiàn)下,高效減水劑對水泥的分散性能是受高效減水劑本身對水泥的分散能力以及高效減水劑對黏土的敏感性決定的。而高效減水劑對黏土的敏感性得以系統(tǒng)的研究,結(jié)果發(fā)現(xiàn)其是由自由水和高效減水劑被黏土的吸附量決定的。黏土與不同高效減水劑作用下,其對陽離子的吸附行為得以研究(包括層間和表面)。高效減水劑與黏土的作用機理得以澄清。這項工作對于目的性的設(shè)計出抗黏土型高效減水劑具有指導(dǎo)性作用。3、使用陽離子單體甲基丙烯酰氧乙基三甲基氯化銨發(fā)生自由基均聚反應(yīng)制得了陽離子型抗泥劑,該陽離子單體與傳統(tǒng)的聚羧酸減水劑進行了復(fù)配使用,結(jié)果發(fā)現(xiàn)陽離子單體的加入降低了傳統(tǒng)聚羧酸減水劑對黏土的敏感性。水分和聚羧酸減水劑被黏土的的吸附測試表明,陽離子型抗泥劑是通過降低自由水和聚羧酸減水劑被黏土的吸附而實現(xiàn)降低聚羧酸減水劑對黏土的敏感性的,XRD測試表明陽離子型抗泥劑抑制了聚羧酸減水劑嵌入到黏土的層間。
[Abstract]:In this paper, a new polycarboxylic acid water reducer without the side chain of polyethylene glycol was prepared by modifying the structure of traditional polycarboxylic acid superplasticizer, and the resistance of polycarboxylic acid water reducer to clay was improved. Then the effects of clay on the properties of different superplasticizers are studied, and the interaction mechanism between different superplasticizers and clay is discussed. This study is helpful to understand the exact role of clay in concrete. It provides a useful basis for the further design of clay resistant superplasticizer. On the basis of the interaction mechanism between different superplasticizers and clay, a cationic anti-mud agent was designed and used in combination with traditional polycarboxylic acid water reducer. The mixed system improved the resistance to clay. When clay is contained in concrete aggregate, it provides a solution for traditional polycarboxylic acid superplasticizer to improve its resistance to clay. A monomer containing tertiary amine group, dimethylamine methacrylate, was introduced and itaconic acid was added. Acrylic acid is used to synthesize polycarboxylic acid superplasticizer. The superplasticizer was characterized and tested for its dispersity to cement when the clay appeared. The results show that the new polycarboxylic acid superplasticizer has better dispersion cement properties than traditional polycarboxylic acid superplasticizer. XRD and TOC tests show that the new polycarboxylic acid superplasticizer acts with clay only by electrostatic interaction on the surface. The traditional interaction between polycarboxylic acid superplasticizer and clay is through surface electrostatic adsorption and interlayer chemisorption, traditional polycarboxylic acid water reducer, poly (carboxylic acid) water reducer without side chain of polyethylene glycol. Condensate superplasticizers have been used to study the dispersion of cement and their interaction with clay in the presence of clay. The results show that the dispersibility of the superplasticizer to cement is determined by the dispersion ability of the superplasticizer to cement and the sensitivity of the superplasticizer to the clay. The sensitivity of the superplasticizer to the clay is studied systematically. It is found that the sensitivity of the superplasticizer is determined by the amount of the free water and the superplasticizer being adsorbed by the clay. The adsorption behavior of cations (interlaminar and surface) was studied by clay and different superplasticizers. The mechanism of the interaction between superplasticizer and clay was clarified. This work is instructive for the purposeful design of anti-clay superplasticizer. Using the cationic monomer methacryloxy ethyl trimethylammonium chloride free radical homopolymerization to produce cationic anti-slime agent. The cationic monomer was mixed with traditional polycarboxylic acid water reducer. The results showed that the addition of cationic monomer reduced the sensitivity of traditional polycarboxylic acid superplasticizer to clay. The adsorption tests of water and polycarboxylic acid superplasticizer by clay show that, Cationic anti-mud agent can reduce the sensitivity of polycarboxylic acid water reducer to clay by reducing the adsorption of free water and polycarboxylic acid water reducer by clay. The results of XRD show that cationic anti-mud agent can inhibit the intercalation of polycarboxylic acid water reducer into clay layer.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528.042.2

【參考文獻】

相關(guān)期刊論文 前1條

1 Johann Plank;Panagiotis Chatziagorastou;Christian Hirsch;;水化水泥顆粒表面超塑化劑吸附層分布模型(英文)[J];建筑材料學(xué)報;2007年01期

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本文編號：2096312