本文選題：竹原纖維 + 水泥�。� 參考：《福建農(nóng)林大學(xué)》2017年碩士論文

【摘要】：纖維增強水泥基復(fù)合材料可在一定程度上解決高性能水泥復(fù)合材料拉壓比低、韌性差、耐久性低的問題。同時,纖維增強水泥復(fù)合材料也可提高水泥基材料的韌性,減少水泥基材料結(jié)構(gòu)產(chǎn)生的荷載裂縫,克服早期收縮裂縫、易軟化等缺點。本文采用竹原纖維為增強體,制備了竹原纖維增強水泥基復(fù)合材料。針對竹原纖維與水泥基體間界面相容性差的難題,采取三種價格低廉、方便簡易的方法(甘油改性、鋁酸酯改性和硅烷改性)對竹原纖維進行改性,對改性竹原纖維/水泥基復(fù)合材料進行核磁共振、掃描電鏡、抗拉、抗壓及干燥收縮、凍融破壞、碳化等實驗,對復(fù)合材料的界面結(jié)合情況、孔隙率、抗拉強度、抗?jié)B、抗凍融等性能進行研究。主要研究結(jié)果如下:(1)甘油改性竹原纖維增強水泥復(fù)合材料孔隙率最低,能顯著提高復(fù)合材料的密實度。鋁酸酯改性竹原纖維/水泥復(fù)合材料內(nèi)部孔徑分布比普通水泥復(fù)合材料更均勻,水分飽和后材料內(nèi)部水分分布最均勻。(2)改性竹原纖維/水泥復(fù)合材料具有明顯的多裂縫開裂特性和應(yīng)變硬化,纖維改性顯著提高了復(fù)合材料的韌性、抗拉強度和抗折強度。鋁酸酯改性組折壓比和拉壓比相比標準組分別提高23%和61.4%(3)甘油改性竹原纖維/水泥復(fù)合材料有較好的力學(xué)性能及耐候性;試件破壞時具有較好的完整性,具有一定的塑性。(4)毛細吸水實驗及氯離子侵蝕實驗結(jié)果表明:改性竹原纖維的加入對抗?jié)B性能影響較大,鋁酸酯改性竹原纖維復(fù)合材料具有較好的抗?jié)B性能。(5)干燥收縮、凍融破壞和碳化實驗結(jié)果發(fā)現(xiàn):甘油改性竹原纖維/水泥復(fù)合材料具有良好的抗收縮能力;鋁酸酯改性竹原纖維/水泥復(fù)合材料抗凍能力優(yōu)異,加入鋁酸酯改性的竹原纖維能夠有效地延緩水泥復(fù)合材料的老化進程,延長其使用壽命。
[Abstract]:Fiber reinforced cement matrix composites can solve the problems of low tensile / compression ratio, poor toughness and low durability of high performance cement composites to some extent.At the same time, fiber reinforced cement composites can also improve the toughness of cement-based materials, reduce the load cracks caused by the structure of cement-based materials, overcome the early shrinkage cracks, easy to soften and so on.In this paper, bamboo fiber reinforced cement matrix composites were prepared by using bamboo fibers as reinforcements.Aiming at the difficult problem of poor interfacial compatibility between bamboo fiber and cement matrix, three simple and convenient methods (glycerol modification, aluminate modification and silane modification) were adopted to modify bamboo raw fiber.The modified bamboo fiber / cement matrix composites were tested by NMR, SEM, tensile resistance, compression and drying shrinkage, freeze-thaw destruction, carbonization, etc. The interfacial bonding, porosity, tensile strength and impermeability of the composites were studied.The properties of freeze-thaw resistance were studied.The main results are as follows: 1) the porosity of glycerol modified bamboo fiber reinforced cement composites is the lowest and the compactness of the composites can be improved significantly.The pore size distribution of bamboo-fiber / cement composites modified by aluminate is more uniform than that of ordinary cement composites.The modified bamboo fiber / cement composites have obvious multi-crack cracking characteristics and strain hardening after water saturation. The fiber modification improves the toughness, tensile strength and flexural strength of the composites.Compared with the standard group, the flexural pressure ratio and tension compression ratio of aluminate modified group increased by 23% and 61.4% respectively) glycerol modified bamboo fiber / cement composite had better mechanical properties and weathering resistance, and the specimen had better integrity when it was destroyed.The results of capillary water absorption experiment and chloride ion erosion test showed that the addition of modified bamboo fiber had great influence on the permeability resistance, and aluminates modified bamboo fiber composite had better anti-seepage property.The results of freeze-thaw failure and carbonization test showed that glycerol modified bamboo fiber / cement composite had good anti-shrinkage ability, and aluminate modified bamboo fiber / cement composite had excellent freezing resistance.The bamboo-fiber modified by aluminate can effectively delay the aging process of cement composite and prolong its service life.
【學(xué)位授予單位】：福建農(nóng)林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528.58;TB332

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