本文選題：水泥 + 蒙脫石�。� 參考：《武漢理工大學(xué)》2015年碩士論文

【摘要】：本文依托于國家自然科學(xué)基金(51408448)“聚羧酸減水劑與羥基羧酸鹽緩凝劑的分子結(jié)構(gòu)耦合機(jī)理”和國家自然科學(xué)基金項(xiàng)目(51178363)“混凝土Thaumasite侵蝕機(jī)理及防護(hù)措施的研究”,針對(duì)混凝土坍落度經(jīng)時(shí)損失引起的施工問題,通過制備聚羧酸類緩釋型保坍劑,并復(fù)配高性能減水劑和緩凝劑,經(jīng)過試驗(yàn)找出性能優(yōu)良的混凝土保坍材料。同時(shí),通過探討蒙脫石與保坍材料的相互作用機(jī)理,找出有效的抗蒙脫石保坍材料,解決混凝土含泥量高引起的坍落度損失大的問題。最后,在夏天高溫環(huán)境和混凝土原材料含泥量較高的條件下,將后摻抗泥型保坍材料應(yīng)用于混凝土拌合中,為解決混凝土坍落度損失問題提供一定的方法。具體內(nèi)容如下:1制備聚羧酸類減水劑和緩釋型保坍劑,并研究保坍劑的作用機(jī)理,為制備保坍材料體系提供理論基礎(chǔ),具體內(nèi)容如下:(1)通過氣象色譜測定馬來酸酐單甲酯的轉(zhuǎn)化率,發(fā)現(xiàn)最佳合成條件為:反應(yīng)時(shí)間105min,順丁烯二酸酐/甲醇的摩爾比為1.1:1,催化劑選用濃硫酸,轉(zhuǎn)化率達(dá)到84.69%。(2)檢測保坍劑的穩(wěn)定性,丙烯酸羥乙酯型保坍劑靜置3個(gè)月后保坍性能優(yōu)良,馬來酸酐單甲酯型保坍劑在靜置過程中,結(jié)構(gòu)中的酯基發(fā)生水解反應(yīng),變成性能優(yōu)良的高效減水劑。(3)通過核磁能譜的測定,發(fā)現(xiàn)保坍劑的作用機(jī)理是分子結(jié)構(gòu)中酯基的在水化過程中水解從而“緩慢釋放”羧基,與高性能減水劑相比,它可以長時(shí)間保持分散性能。2復(fù)配減水劑、保坍劑和緩凝劑,尋找出性能優(yōu)良的保坍材料體系,具體內(nèi)容如下:(1)復(fù)配保坍劑與減水劑時(shí),兩者匹配性較好,特別是摻入0.8g JS-3減水劑和0.2g BT保坍劑時(shí)效果最優(yōu),初始流動(dòng)度為210mm,1h流動(dòng)度為240mm。(2)緩凝劑與保坍劑或減水劑在水泥顆粒表面發(fā)生競爭吸附,可以在保證凈漿初始流動(dòng)度的基礎(chǔ)上,有效抑制1h的凈漿流動(dòng)度損失,其中影響力大小為STTPSGFS。(3)JS-3-BT-緩凝劑的三元組分保坍類材料的性能優(yōu)良,特別是在各組分質(zhì)量為JS-3(0.8g)-BT(0.2g)-緩凝劑(0.2g)時(shí),水泥凈漿的初始流動(dòng)度在220~235mm,1h流動(dòng)度在240~255mm。3粘土礦物中以蒙脫石(鈣基)為代表,其摻入水泥中會(huì)明顯影響水泥凈漿流動(dòng)性能,通過研究其對(duì)聚羧酸減水劑的吸附機(jī)理,找出合適的材料體系抑制蒙脫石對(duì)減水劑的吸附,具體內(nèi)容如下:(1)當(dāng)水泥中摻入蒙脫石,水泥凈漿的初始流動(dòng)度和1h流動(dòng)度大幅降低,且隨著蒙脫石摻量的增加而降幅增大。(2)蒙脫石摻入不同的聚羧酸減水劑或保坍劑后,在105℃的真空干燥箱中烘干后,用XRD測定蒙脫石層間距,發(fā)現(xiàn)蒙脫石層間距變大,由1.51nm增加到1.63~1.70nm,同時(shí)用TOC測試蒙脫石對(duì)聚羧酸減水劑的吸附遠(yuǎn)大于水泥對(duì)聚羧酸減水劑的吸附,所以當(dāng)水泥中混入蒙脫石會(huì)導(dǎo)致減水劑的有效利用率大大降低,是水泥凈漿經(jīng)時(shí)損失很大的原因。(3)當(dāng)水泥-蒙脫石體系中同時(shí)摻入聚羧酸減水劑和緩凝劑時(shí),可以保證水泥凈漿的初始流動(dòng)性能,抑制凈漿的經(jīng)時(shí)損失。這是因?yàn)榫從齽⿻?huì)與蒙脫石發(fā)生離子交換,抑制了蒙脫石對(duì)聚羧酸減水劑的吸附,保證了水泥顆粒對(duì)減水劑的吸附。(4)蒙脫石吸附聚羧酸減水劑的方式是部分聚羧酸減水劑的側(cè)鏈吸附到蒙脫石的層間。4當(dāng)混凝土含泥量較高或高溫環(huán)境下,用后摻保坍材料的方式解決混凝土坍落度經(jīng)時(shí)損失過大問題,具體如下:(1)當(dāng)混凝土中含泥量較高時(shí)(8%),混凝土單摻減水劑或保坍劑時(shí),混凝土的坍落度損失較快,60min是坍落度為0mm,已經(jīng)不具備施工性能。采用減水劑-保坍劑-緩凝劑的三元組分保坍材料,可以有效地抑制混凝土的坍落度損失,在夏季較高的溫度下,可以保證混凝土的60min坍落度在180mm以上,保證了施工性能。(2)采用分兩次摻入保坍材料的方法可以保證混凝土120min的坍落度在180mm以上,滿足施工要求。保坍材料的初摻和后摻比例宜選用為70%和30%或80%和20%。
[Abstract]:This paper is based on the National Natural Science Fund (51408448) "the molecular structure coupling mechanism of Polycarboxylic Water reducing agent and hydroxy carboxylate retarder" and the National Natural Science Fund Project (51178363) "Research on the corrosion mechanism and protective measures of concrete Thaumasite", in view of the construction problems caused by the time loss of the slump of the coagulant soil, through the system, The polycarboxylic acid slump retaining agent was prepared, and the high performance water reducing agent and retarder were mixed, and the concrete slump material with good performance was found through the experiment. At the same time, the effective anti montmorillonite slump material was found out by discussing the interaction mechanism of the montmorillonite and the slump material, and the large slump loss caused by the high mud content of the coagulant soil was solved. Finally, under the condition of high temperature environment in summer and high mud content of concrete raw materials, it will be applied in concrete mixing with mud anti slump material to solve the problem of concrete slump loss. The specific contents are as follows: 1 the preparation of Polycarboxylic Water reducing agent and sustained release type slump agent, and the mechanism of the action of the slump agent are studied. In order to provide the theoretical basis for the preparation of slump protection material system, the following contents are as follows: (1) the optimum synthesis conditions are as follows: reaction time 105min, the molar ratio of maleic anhydride / methanol to 1.1:1, concentrated sulfuric acid in the catalyst, and the conversion of 84.69%. (2) to detect the stability of the slump agent. The slump retention agent of the hydroxyethyl acrylate type is excellent for 3 months. During the static process, the ester group of maleic anhydride monomethyl ester type is hydrolyzed to a high performance superplasticizer. (3) through the determination of NMR spectra, it is found that the mechanism of the slump agent is in the hydration process of the ester group in the molecular structure. The hydrolysis can "slow release" carboxyl group. Compared with the high performance water reducing agent, it can maintain the dispersible.2 water reducing agent for a long time, the slump agent and the retarder, and find out the good properties of the slump material system. The specific contents are as follows: (1) when the compound and the water reducing agent are combined, the match is better, especially the 0.8g JS-3 water reducing agent and the 0.2g. BT has the best effect, initial flow degree is 210mm, 1H flow degree is 240mm. (2), and the retarder and slump agent or water reducing agent are competitive adsorption on the surface of cement particles. On the basis of guaranteeing the initial flow degree of the pulp, the flow degree loss of 1H is effectively suppressed, and the influence size is three yuan of STTPSGFS. (3) JS-3-BT- retarder. The properties of the components are excellent, especially when the mass of each component is JS-3 (0.8g) -BT (0.2g) - retarder (0.2g), the initial flow degree of the cement paste is 220~235mm, and the 1H fluidity is represented by the montmorillonite (calcium base) in the clay minerals of 240~255mm.3, which will obviously affect the flow performance of cement paste in the mud. The adsorption mechanism of the carboxylic water reducing agent was found to find the suitable material system to inhibit the adsorption of the montmorillonite on the water reducing agent. The specific contents are as follows: (1) when the cement is added to the montmorillonite, the initial flow degree and the 1H flow degree of the cement paste are greatly reduced, and the decrease increases with the increase of the amount of montmorillonite. (2) the montmorillonite is mixed with different polycarboxylate water reducing agents or After the slump agent was dried in a vacuum drying box at 105 C, the interval between the montmorillonite layer was measured by XRD. It was found that the spacing of the montmorillonite increased from 1.51nm to 1.63~1.70nm. At the same time, the adsorption of montmorillonite to Polycarboxylic Water reducing agent was far greater than that of cement to the polycarboxylic water reducing agent. So when the cement was mixed with montmorillonite, the water reducing agent would lead to the water reducing agent. The effective utilization ratio is greatly reduced, which is the cause of great loss of cement paste. (3) when the cement montmorillonite system is mixed with Polycarboxylic Water reducing agent and retarder, the initial flow performance of cement paste can be guaranteed and the time loss of the pulp can be suppressed. This is because the retarder will exchange the montmorillonite with the montmorillonite and inhibit the montmorillonite. The adsorption of Polycarboxylic Water reducing agent ensures the adsorption of cement particles to water reducing agents. (4) the way of montmorillonite absorption of polycarboxylic acid water reducing agent is that the side chain of a partial polycarboxylic acid water reducer is adsorbed to the interlayer.4 of montmorillonite when the concrete has high mud content or high temperature environment, and the concrete slump is used to solve the time loss of the concrete slump. The major problems are as follows: (1) when the concrete content of mud is high (8%), the slump loss of concrete is faster when concrete is mixed with water reducing agent or slump agent, and the slump of 60min is 0mm, and it has no construction performance. The slump loss of concrete can be effectively suppressed by using the three component of the water reducing agent - the slump agent - retarder. Loss, at higher temperature in summer, the 60min slump of concrete can be guaranteed to be above 180mm, and the construction performance is guaranteed. (2) the method of adding two times into the concrete slump material can guarantee the slump of the concrete 120min above 180mm and meet the construction requirements. The initial blending ratio of the slump material should be selected as 70% and 30% or 80% and 20%..

【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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