本文選題：粉煤灰　切入點(diǎn)：水泥基復(fù)合材料　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：水泥基復(fù)合材料具有抗壓強(qiáng)度高、耐久性好、價(jià)格低廉等特點(diǎn),因而廣泛應(yīng)用于公路、橋梁、鐵路、隧道、城建等領(lǐng)域,與其優(yōu)點(diǎn)并存的還有天然存在的脆性問(wèn)題。聚合物常被用來(lái)改善這種脆性問(wèn)題,但物理?yè)郊右揽吭龃蠓肿娱g作用力的方式對(duì)相界面過(guò)渡區(qū)組成結(jié)構(gòu)改善作用有限,且聚合物與粗、細(xì)骨料及水化膠凝材料之間物相相容性不好,這在很大程度上阻礙了水泥基復(fù)合材料抗折性能的提升。粉煤灰是一種理想的混凝土礦物摻合料,本研究通過(guò)化學(xué)手段,將高親水性聚合物直接接枝在粉煤灰表面,得到聚合物改性粉煤灰,來(lái)提升水泥基復(fù)合材料的抗折強(qiáng)度。具體工作方法及內(nèi)容如下：(1)通過(guò)酸堿溶液處理法,對(duì)粉煤灰進(jìn)行表面羥基化處理,然后用有機(jī)硅烷偶聯(lián)劑KH-570對(duì)羥基化粉煤灰進(jìn)行偶聯(lián)改性得到KH-570偶聯(lián)改性粉煤灰,與聚乙二醇單甲醚丙烯酸脂(MPA,自制)聚合改性得到聚乙二醇單甲醚丙烯酸酯改性粉煤灰,來(lái)提升水泥基復(fù)合材料的抗折強(qiáng)度。(2)通過(guò)Piranha溶液(20%雙氧水、98%濃硫酸)處理法,對(duì)粉煤灰進(jìn)行表面羥基化處理,然后用有機(jī)硅烷偶聯(lián)劑KH-570對(duì)羥基化粉煤灰進(jìn)行偶聯(lián)改性得到KH-570偶聯(lián)改性粉煤灰,與丙烯酰胺聚合改性得到聚丙烯酰胺改性粉煤灰,來(lái)提升水泥基復(fù)合材料的抗折強(qiáng)度。(3)通過(guò)酸堿溶液處理法,對(duì)粉煤灰進(jìn)行表面羥基化處理,然后用有機(jī)硅烷偶聯(lián)劑KH-566對(duì)羥基化粉煤灰進(jìn)行偶聯(lián)改性得到KH-566偶聯(lián)改性粉煤灰,與丙烯酸聚合改性得到聚丙烯酸改性粉煤灰,來(lái)提升水泥基復(fù)合材料的抗折強(qiáng)度。
[Abstract]:Cement based composites are widely used in highway, bridge, railway, tunnel, urban construction and other fields because of their high compressive strength, good durability and low price. Polymer is often used to improve the brittleness problem, but physical admixture by increasing the intermolecular force has limited effect on the structure improvement of the transition zone of the phase interface. The compatibility of polymer with coarse, fine aggregate and hydrated cementitious materials is poor, which greatly hinders the improvement of flexural properties of cement matrix composites. Fly ash is an ideal mineral admixture for concrete. In this study, high hydrophilic polymer was grafted directly on the surface of fly ash by chemical means to obtain polymer modified fly ash. To enhance the flexural strength of cement based composites. The specific working methods and contents are as follows: (1) the surface hydroxylation of fly ash is treated by acid and alkali solution treatment. Then the hydroxylated fly ash was modified by organic silane coupling agent KH-570 to obtain KH-570 coupling modified fly ash and poly (ethylene glycol monomethyl ether acrylate) modified fly ash was polymerized to obtain polyethylene glycol monomethyl ether acrylate modified fly ash. To improve the flexural strength of cement matrix composites. The surface hydroxylation of fly ash was treated by Piranha solution of 20% hydrogen peroxide and 98% concentrated sulfuric acid. Then the hydroxylated fly ash was modified by KH-570, and then the KH-570 modified fly ash was modified by KH-570. The modified fly ash was polymerized with acrylamide to obtain polyacrylamide modified fly ash. To improve the flexural strength of cement matrix composites, the surface hydroxylation of fly ash was treated by acid-base solution treatment, and then the hydroxylated fly ash was modified by organic silane coupling agent KH-566 to obtain KH-566 coupling modified fly ash. Polyacrylic acid modified fly ash was prepared by polymerization with acrylic acid to improve the flexural strength of cement based composites.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ536.4;TB332

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