本文選題：水泥基材料 + 納米壓痕��； 參考：《交通部公路科學(xué)研究院》2014年碩士論文

【摘要】：隨著科技的進(jìn)步和經(jīng)濟的發(fā)展，水泥基材料的性能不斷提高，應(yīng)用范圍日益廣泛。水泥基材料的宏觀性質(zhì)迥異，究其本質(zhì)是由微觀尺度上的材料特性決定的。為進(jìn)一步滿足實際工程需求，必須從材料的本質(zhì)出發(fā)進(jìn)行性能的研究，以獲得預(yù)測和改善其宏觀性能的重要信息。本文使用納米壓痕、熱重分析、原子力顯微鏡成像等先進(jìn)技術(shù)，尤其基于納米壓痕技術(shù)作為目前唯一能夠定量表征材料微觀力學(xué)性能這一優(yōu)勢，通過針對性的表面處理程序和合適的加卸載制度，采用15×15的壓痕點陣對不同配比的硬化后水泥凈漿試件進(jìn)行測試，基于EM算法對得到的代表水化產(chǎn)物的大樣本數(shù)據(jù)進(jìn)行高斯混合分布的物相劃分并獲得各相力學(xué)性能，運用微觀力學(xué)方法計算C-S-H凝膠基本組成單元(凝膠顆粒)的力學(xué)性能和堆積密度，探討堆積方式，建立三相水泥漿體骨架模型分析壓痕結(jié)果，推算材料水化程度。 結(jié)果表明水泥基材料中的主要水化產(chǎn)物由LD C-S-H、HD C-S-H和HD/CH復(fù)合體三部分組成，不同配合比導(dǎo)致各相水化產(chǎn)物體積百分率有所差異，但同相水化產(chǎn)物的力學(xué)性能比較穩(wěn)定，較低的水膠比有利于生成密實的水化產(chǎn)物，而隨著水膠比的增大，低密度的水化產(chǎn)物增多，含礦渣的試件中HD/CH復(fù)合體較少。凝膠顆�；玖W(xué)性質(zhì)較為穩(wěn)定，說明凝膠顆粒是C-S-H凝膠的基本組成單元，其不同的堆積密度形成了不同的C-S-H相及其相應(yīng)的力學(xué)性能。建立水泥漿體骨架模型計算水泥基材料的水化程度，有助于識別模量處于水化產(chǎn)物和未水化顆粒之間的混合物相的壓痕試驗數(shù)據(jù)，并與使用熱重分析得到的水化程度進(jìn)行比較，二者吻合較好。 因此，納米壓痕技術(shù)作為微觀尺度研究物質(zhì)的一種手段，可以得到水泥基材料微觀結(jié)構(gòu)的綜合信息�；谖⒂^尺度材料性質(zhì)參數(shù)，可以與更大尺度進(jìn)行逐級聯(lián)系，，以期系統(tǒng)掌握水泥基材料的本質(zhì)特征，有針對性地改善材料宏觀性能。
[Abstract]:With the progress of science and technology and the development of economy, the properties of cement-based materials have been improved and the application range is more and more extensive. The macroscopical properties of cement-based materials are very different, and their essence is determined by the micro-scale material properties. In order to meet the needs of practical engineering, it is necessary to study the properties from the point of view of the nature of materials, in order to obtain important information to predict and improve their macroscopic properties. In this paper, nanoindentation, thermogravimetric analysis, atomic force microscope imaging and other advanced techniques are used, especially based on nano-indentation technology as the only quantitative characterization of the material's micromechanical properties. Through the specific surface treatment program and the suitable loading and unloading system, the indentation lattice of 15 脳 15 was used to test the hardened cement paste specimen with different ratio. Based on EM algorithm, the obtained large sample data representing hydration products are partitioned by Gao Si mixed distribution, and the mechanical properties of each phase are obtained. The mechanical properties and packing density of the basic component unit (gel particle) of C-S-H gel were calculated by means of micromechanics method. The packing mode was discussed, and the indentation result was analyzed by using the framework model of three-phase cement paste, and the hydration degree of the material was calculated. The results show that the main hydration products in cement-based materials are composed of LD C-S-HNH HD C-S-H and HD/CH complexes. The volume percentage of hydration products varies with different mixing ratios, but the mechanical properties of the hydration products in the same phase are relatively stable. The low water-binder ratio is favorable to the formation of dense hydration products, but with the increase of water-binder ratio, the low-density hydration products increase, and the HD/CH complex is less in the samples containing slag. The basic mechanical properties of the gel particles are relatively stable, which indicates that the gel particles are the basic components of the C-S-H gel. The different packing densities of the gel particles form different C-S-H phases and their corresponding mechanical properties. Establishing a cement paste skeleton model to calculate the hydration degree of cement-based materials is helpful to identify the indentation test data of mixtures whose modulus is between hydrated products and unhydrated particles, and to compare with the hydration degree obtained by thermogravimetric analysis. The two agree well. Therefore, nanoindentation technology can be used as a means to study materials on a micro scale, and comprehensive information of microstructure of cement based materials can be obtained. Based on the properties of micro-scale materials, they can be connected with the larger scale step by step, in order to systematically grasp the essential characteristics of cement-based materials and improve the macroscopic properties of the materials.
【學(xué)位授予單位】：交通部公路科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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