本文選題：氧化石墨烯 + 水泥基材料�。� 參考：《北京建筑大學(xué)》2017年碩士論文

【摘要】：氧化石墨烯作為一種二維納米材料,目前在水泥混凝土領(lǐng)域已有廣泛的應(yīng)用研究,但氧化石墨烯對(duì)水泥基材料的性能影響機(jī)理還不明確。本文通過制備氧化石墨烯水泥漿體和膠砂,研究了氧化石墨烯對(duì)水泥的流變行為、水泥的水化進(jìn)程和水化產(chǎn)物以及硬化后的水泥基材料多種性能的影響,并分析了氧化石墨烯在水泥基材料中的作用機(jī)理。通過AFM、TEM、XPS、FTIR等手段表征了本文所用氧化石墨烯的片層尺寸、含氧官能團(tuán)種類和數(shù)量以及微觀形貌。本文所用氧化石墨烯的片層厚度約為1納米,在水相中易出現(xiàn)卷曲褶皺,其上主要帶有羥基、羧基以及少量的環(huán)氧基。氧化石墨烯的含氧量約為48%。使用流變儀和激光共聚焦顯微鏡對(duì)氧化石墨烯新拌水泥漿體的流變學(xué)參數(shù)以及漿體形貌進(jìn)行了觀測(cè)。在新拌水泥漿體中,氧化石墨烯由于其較大的比表面積和其片層上含有的大量環(huán)氧官能團(tuán),使得水泥漿體中的顆粒形成大量的“重組絮凝結(jié)構(gòu)”。“重組絮凝結(jié)構(gòu)”的形成,直接影響了新拌水泥漿體一系列流變參數(shù),使得漿體增稠增黏。通過等溫量熱儀、XRD、TG-DTA以及ICP等手段對(duì)氧化石墨烯水泥水化程度、水化產(chǎn)物等進(jìn)行了測(cè)定。研究表明氧化石墨烯對(duì)水泥的水化進(jìn)程無明顯影響。氧化石墨烯對(duì)水泥水化的主要產(chǎn)物之一氫氧化鈣的形態(tài)有顯著影響。氧化石墨烯的存在不僅對(duì)六方片狀晶體氫氧化鈣的生成有明顯的抑制作用,并且能夠細(xì)化晶體氫氧化鈣的尺寸。通過力學(xué)、孔結(jié)構(gòu)、收縮以及抗氯離子滲透系數(shù)等方法對(duì)氧化石墨烯水泥基材料(水泥石和水泥砂漿)的多種性能進(jìn)行了測(cè)試。研究表明氧化石墨烯的摻入可以有效提高水泥基材料的抗折強(qiáng)度以及抗壓強(qiáng)度。氧化石墨烯的摻入增加了硬化水泥漿體中的凝膠孔以及毛細(xì)孔數(shù)量,起到了細(xì)化孔結(jié)構(gòu)的作用。氧化石墨烯的摻入使得硬化水泥漿體以及水泥膠砂的自然干縮顯著增加。氧化石墨烯的摻入對(duì)水泥膠砂的抗?jié)B性性能有一定提高。對(duì)氧化石墨烯硬化水泥漿體微觀形貌的觀察表明,本文所用氧化石墨烯對(duì)水泥水化產(chǎn)物中晶體的排布并無明顯影響。本文認(rèn)為氧化石墨烯對(duì)水泥基材料性能的增強(qiáng)原因主要有三方面:一是氧化石墨烯對(duì)晶體氫氧化鈣的細(xì)化作用以及晶型轉(zhuǎn)變作用,二是氧化石墨烯對(duì)材料孔結(jié)構(gòu)的細(xì)化作用,三是氧化石墨烯片層對(duì)于破壞過程中塊體內(nèi)部微裂縫的形成和擴(kuò)展有一定的阻礙作用。
[Abstract]:Graphene oxide, as a two-dimensional nano-material, has been widely used in the field of cement concrete, but the influence mechanism of graphene oxide on the performance of cement-based materials is not clear. In this paper, the effects of graphene oxide on the rheological behavior of cement, the hydration process of cement and the hydration products, as well as the properties of hardened cement-based materials were studied by preparing graphene oxide cement paste and cemented sand. The mechanism of action of graphene oxide in cement-based materials was analyzed. The size of graphene oxide lamellar, the type and number of oxygen-containing functional groups and the micromorphology of graphene oxide were characterized by AFMMA-TEMP-XPS FTIR. The lamellar thickness of graphene oxide used in this paper is about 1 nm, and it is prone to crimp and fold in water phase, with hydroxyl group, carboxyl group and a small amount of epoxy group on it. The oxygen content of graphene oxide is about 48. Rheological parameters and slurry morphology of graphene oxide fresh cement paste were observed by means of rheometer and laser confocal microscope. In the fresh cement paste, graphene oxide has a large specific surface area and a large number of epoxy functional groups in its lamellar layer, which makes the particles in the cement paste form a large number of "recombined flocculation structures". The formation of "recombined flocculation structure" directly affects a series of rheological parameters of fresh cement paste, which makes the slurry thickening and viscosity increasing. The hydration degree and hydration products of graphene oxide cement were determined by means of isothermal calorimeter TG-DTA and ICP. The results show that graphene oxide has no effect on the hydration process of cement. Graphene oxide has a significant effect on the morphology of calcium hydroxide, one of the main products of cement hydration. The existence of graphene oxide can not only inhibit the formation of calcium hydroxide in hexagonal crystal, but also refine the size of crystal calcium hydroxide. The properties of graphene oxide cement-based materials (cement stone and cement mortar) were tested by means of mechanics pore structure shrinkage and chloride ion permeation coefficient. The results show that the addition of graphene oxide can effectively improve the flexural strength and compressive strength of cement-based materials. The addition of graphene oxide increased the number of gel pores and capillary pores in hardened cement paste, and played a role in refining the pore structure. The addition of graphene oxide increases the natural shrinkage of hardened cement paste and cement mortar. The addition of graphene oxide can improve the impermeability of cement mortar. The observation of the microstructure of graphene oxide hardened cement paste shows that the graphene oxide used in this paper has no obvious effect on the distribution of crystals in the hydration products of cement. The main reasons for the enhancement of graphene oxide on the properties of cement-based materials are as follows: firstly, the effect of graphene oxide on the refinement of crystal calcium hydroxide and the effect of crystal transformation, and second, the effect of graphene oxide on the pore structure of the material. The third is that graphene oxide lamellae is a hindrance to the formation and expansion of microcracks in the block during the process of failure.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ127.11;TQ172.1

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