本文關(guān)鍵詞： 水化模型 水泥漿體 水化過程 水化度 微觀結(jié)構(gòu) 粉煤灰 礦粉 CH 化學(xué)結(jié)合水 電阻率 抗壓強(qiáng)度 濕度擴(kuò)散　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：建筑工程的耐久性問題需要人們對水泥基材料的水化過程有較好的認(rèn)識。本文研究水泥凈漿和摻礦物摻合料水泥漿體的水化過程,提出相應(yīng)的水化模型,利用水化模型深入研究水泥漿體電阻率發(fā)展規(guī)律、混凝土抗壓強(qiáng)度和濕度擴(kuò)散發(fā)展規(guī)律。主要研究工作如下： (1)為了精確預(yù)測水泥水化過程,分析水泥水化過程中微觀結(jié)構(gòu)的時變發(fā)展規(guī)律,提出了水化單元的概念,基于水泥水化的微觀信息,采用Krstulovic-Dabic水化反應(yīng)動力學(xué)方程式,構(gòu)建了水泥水化度與微觀結(jié)構(gòu)之間的聯(lián)系,考慮了水灰比、水泥化學(xué)組分、孔隙水分、溫度、水泥顆粒和水接觸面積、水泥顆粒粒徑分布等因素對水泥水化過程的影響,建立了改進(jìn)的水泥水化動力學(xué)模型。在本研究中通過熱重分析法、壓汞試驗、環(huán)境掃描電鏡掃描(ESEM)等一系列試驗方法分析水泥凈漿的水化度、孔隙率、微觀結(jié)構(gòu)等的時變發(fā)展規(guī)律。試驗結(jié)果與模型預(yù)測結(jié)果吻合良好,表明該模型可以較準(zhǔn)確地模擬水泥水化過程的時變發(fā)展規(guī)律。 (2)基于水泥水化模型,類比水泥水化,得出了粉煤灰／礦粉的水化方程,通過考慮粉煤灰的稀釋、物理效應(yīng)、化學(xué)效應(yīng)和礦粉的稀釋、化學(xué)效應(yīng),提出了摻粉煤灰／礦粉水泥水化模型,能夠模擬摻粉煤灰／礦粉水泥水化過程并預(yù)測粉煤灰／礦粉水化度、化學(xué)結(jié)合水、CH含量等水化特征參數(shù)。通過鹽酸選擇性溶解法、EDTA選擇性溶解法、熱重分析法、壓汞試驗和ESEM掃描等一系列試驗方法研究摻粉煤灰／礦粉水泥漿體中的粉煤灰／礦粉水化度、化學(xué)結(jié)合水、CH含量、微觀形貌等參數(shù)的時變規(guī)律,試驗結(jié)果和模型預(yù)測結(jié)果吻合較好,說明模型能夠較好預(yù)測摻粉煤灰／礦粉水泥水化過程。 (3)通過水化模型中提取特征接觸面積、連通固態(tài)體積率和外層水化產(chǎn)物體積等微觀結(jié)構(gòu)參數(shù),研究水泥漿體電阻率和混凝土的抗壓強(qiáng)度、濕度擴(kuò)散發(fā)展規(guī)律。用無接觸電阻率儀監(jiān)測水泥漿體的電阻率發(fā)展規(guī)律,研究了電阻率和微觀結(jié)構(gòu)參數(shù)的關(guān)系。在Maekawa抗壓強(qiáng)度公式基礎(chǔ)上,結(jié)合本文水化模型,考慮到不同水灰比、不同礦物摻量和漿骨比等因素的影響,預(yù)測了混凝土抗壓強(qiáng)度的發(fā)展規(guī)律,并通過試驗對模型的準(zhǔn)確性進(jìn)行了驗證。初步提出混凝土濕度擴(kuò)散系數(shù)修正公式,通過已有試驗驗證了濕度擴(kuò)散系數(shù)公式的正確性。 論文得到了國家高科技發(fā)展計劃(863計劃,2012AA050903),國家自然科學(xué)基金項目(51320105013,51178413,51378012),國家重點基礎(chǔ)研究發(fā)展計劃(973計劃,2009CB623200)以及浙江省重點科技創(chuàng)新團(tuán)隊(2010R50034)的資助。
[Abstract]:The durability of building engineering requires people to have a better understanding of the hydration process of cement-based materials. In this paper, the hydration process of cement paste and mineral admixture cement paste is studied, and the corresponding hydration model is proposed. The development law of resistivity of cement paste, compressive strength and moisture diffusion of concrete are studied by hydration model. The main research work is as follows: In order to predict the cement hydration process accurately and analyze the time-varying development law of the microstructure in the cement hydration process, the concept of hydration unit is put forward, which is based on the micro-information of cement hydration. The relationship between hydration degree and microstructure of cement was established by using the kinetic equation of Krstulovic-Dabic hydration reaction. The water-cement ratio, cement chemical composition, pore moisture and temperature were considered. The effect of cement particle and water contact area and particle size distribution on the hydration process of cement was studied. An improved dynamic model of cement hydration was established. In this study, the mercury injection test was carried out by thermogravimetric analysis (TGA). A series of test methods, such as environmental scanning electron microscope (SEM) and ESEM, are used to analyze the time-varying development of cement paste, such as hydration degree, porosity and microstructure. The experimental results are in good agreement with the predicted results of the model. It shows that the model can accurately simulate the time-varying development of cement hydration process. Based on cement hydration model, the hydration equation of fly ash / mineral powder is obtained by analogy with cement hydration. The dilution, physical effect, chemical effect and dilution and chemical effect of fly ash are considered. The hydration model of fly ash / mineral powder cement is proposed, which can simulate the hydration process of fly ash / mineral powder cement, predict the hydration degree of fly ash / mineral powder, and chemically combine water. The hydration characteristic parameters such as Ch content were determined by selective dissolution of hydrochloric acid, EDTA selective dissolution and thermogravimetric analysis. A series of test methods, such as mercury injection test and ESEM scanning, were used to study the time-varying laws of the hydration degree of fly ash / mineral powder in fly ash / mineral powder cement paste, the content of chemically bound water and Ch, and the microstructure of cement paste. The experimental results are in good agreement with the prediction results of the model, which indicates that the model can predict the hydration process of cement with fly ash / mineral powder. The specific contact area was extracted from the hydration model, and the microstructure parameters such as solid volume ratio and outer hydration product volume were connected to study the resistivity of cement paste and the compressive strength of concrete. The relationship between resistivity and microstructure parameters of cement paste was studied by using contactless resistivity meter. Based on the formula of Maekawa compressive strength. Combined with the hydration model in this paper, considering the influence of different water-cement ratio, mineral content and slurry / bone ratio, the development law of compressive strength of concrete is predicted. The accuracy of the model is verified by experiments, and the modified formula of moisture diffusion coefficient of concrete is put forward preliminarily, and the correctness of the formula is verified by existing tests. The paper has been obtained from the National High Technology Development Program No. 863 (2012AA050903) and the National Natural Science Foundation (NSFC) project 5132010501351178413. 51378012, the National key basic Research and Development Program of 973. 2009 CB623200) and Zhejiang Province key scientific and technological innovation team 2010 R 50034).
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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