本文選題：泡沫混凝土 + 泡沫穩(wěn)定性��； 參考：《武漢理工大學(xué)》2014年碩士論文

【摘要】：輕質(zhì)泡沫混凝土是一種施工工藝簡便、工作性能良好、具有優(yōu)異的保溫隔熱性能和緩沖吸能特性的新型建筑材料，適用于外墻保溫系統(tǒng)、機(jī)場阻滯隔離帶等重要的工程建設(shè)，其特點(diǎn)符合節(jié)能減排、綠色環(huán)保的要求，具有廣闊的應(yīng)用前景，但應(yīng)用過程中也存在諸如強(qiáng)度低、耐久性差、漿體不夠穩(wěn)定等問題。本文通過大量系統(tǒng)實(shí)驗對輕質(zhì)泡沫混凝土泡沫穩(wěn)定性、漿體特性、微觀孔結(jié)構(gòu)表征方法、物理力學(xué)性能、水分吸收和遷移性質(zhì)等方面進(jìn)行了深入研究，探討了材料組成、微孔結(jié)構(gòu)和宏觀性能三者間的相互作用和影響規(guī)律，對推動該材料的理論發(fā)展與應(yīng)用具有重要意義。本文的主要工作和取得的結(jié)論如下： 運(yùn)用光學(xué)顯微鏡和尺寸測量軟件分析了泡沫水膜和泡沫直徑，通過調(diào)節(jié)泡沫含水量來控制泡沫水膜排液速度和直徑在其形成、穩(wěn)定和破裂過程中的變化規(guī)律，提出了通過調(diào)節(jié)泡沫含水量來控制泡沫水膜排液速度和泡沫直徑擴(kuò)張速度的方法，建立了泡沫含水量和穩(wěn)定性之間的關(guān)系，確定了獲得最佳穩(wěn)定性所需的發(fā)泡倍數(shù)。 采用圖像處理和軟件統(tǒng)計等方法對泡沫混凝土孔結(jié)構(gòu)進(jìn)行分析，定量表征了孔隙率、孔徑、氣孔變形、氣孔密度等參數(shù)，提出了空間因子概念及其計算方法。分析得到不同配比樣品的孔結(jié)構(gòu)參數(shù)，系統(tǒng)研究了泡沫混凝土組成對孔結(jié)構(gòu)的影響規(guī)律，擬合得到了孔結(jié)構(gòu)各參數(shù)間的定量關(guān)系，為控制形成孔徑細(xì)小、形狀規(guī)則、分布均勻的氣孔提供了理論依據(jù)。 從流動性和穩(wěn)定性兩方面分析了泡沫混凝土新拌漿體性能的影響因素，為設(shè)計、制備出工作性能優(yōu)異的泡沫混凝土材料提供了理論指導(dǎo)。采用體積吸水率和基于不飽和流動理論的吸水性分析方法，研究了泡沫混凝土水分吸收、遷移性質(zhì)，提出了泡沫混凝土在工作環(huán)境中的耐久性評價方法。通過探討吸水率和孔結(jié)構(gòu)的關(guān)系，，結(jié)合漿體結(jié)構(gòu)缺陷、氣孔數(shù)量、氣孔尺寸等因素對水分遷移的影響規(guī)律和作用機(jī)制的研究，明確了水分在泡沫混凝土內(nèi)部的遷移動力和途徑。通過真空飽水法和浸水法的吸水率對比、孔壁結(jié)構(gòu)的SEM分析，構(gòu)建了非飽和條件下氣孔的吸水模型，指導(dǎo)泡沫混凝土耐久性設(shè)計。 系統(tǒng)分析了泡沫混凝土物理力學(xué)性能的影響因素，確立了最佳強(qiáng)度-孔隙率結(jié)構(gòu)模型，為泡沫混凝土的配比設(shè)計提供了理論依據(jù)。對研制的容重等級為400Kg～600Kg/m3的輕質(zhì)泡沫混凝土進(jìn)行了工程驗證實(shí)驗，結(jié)果表明其工作性能優(yōu)異、漿體具有較高穩(wěn)定性、與石膏板粘結(jié)性良好，可以滿足工程應(yīng)用的要求。
[Abstract]:Lightweight foam concrete is a new type of building material with simple construction technology, good working performance, excellent thermal insulation and cushioning and energy absorption characteristics. It is suitable for exterior wall insulation system, airport block isolation zone and other important engineering construction. Its characteristics meet the requirements of energy saving and emission reduction, green environmental protection, and have broad application prospects. However, there are still some problems in the application process, such as low strength, poor durability, unstable slurry and so on. In this paper, the stability of light foamed concrete foams, the characteristics of slurry, the characterization of micropore structure, the physical and mechanical properties, the water absorption and migration properties, etc., are studied through a large number of systematic experiments, and the composition of the materials is discussed. The interaction and influence of micropore structure and macroscopic properties are of great significance to the theoretical development and application of this material. The main work and conclusions of this paper are as follows: The foam water film and foam diameter were analyzed by means of optical microscope and size measurement software. By adjusting the foam water content, the velocity and diameter of the foam water film were controlled during its formation, stabilization and rupture. The method of controlling the velocity of foam water film efflux and the velocity of foam diameter expansion by adjusting foam water content is put forward. The relationship between foam water content and foam stability is established, and the foaming times needed to obtain the best stability are determined. The pore structure of foamed concrete was analyzed by image processing and software statistics. The parameters such as porosity, pore diameter, pore deformation and porosity density were quantitatively characterized. The concept of spatial factor and its calculation method were put forward. The pore structure parameters of the samples with different proportions were analyzed, and the influence of foam concrete composition on the pore structure was systematically studied. The quantitative relationship between the pore structure parameters was obtained by fitting the quantitative relationship between the pore structure parameters, in order to control the formation of fine pore diameter and regular shape. The evenly distributed pores provide the theoretical basis. In this paper, the influencing factors of the performance of fresh foam concrete paste are analyzed from the aspects of fluidity and stability, which provides theoretical guidance for the design and preparation of foam concrete materials with excellent working performance. The water absorption and migration properties of foam concrete are studied by using volume water absorption and water absorption analysis based on unsaturated flow theory. The durability evaluation method of foam concrete in working environment is put forward. By discussing the relationship between water absorption and pore structure, combining with the influence law and mechanism of slurry structure defect, pore quantity and pore size on water migration, this paper clarifies the migration power and path of water in foam concrete. Based on the comparison of the water absorption rate between the vacuum saturated method and the immersion method and the SEM analysis of the pore wall structure, the water absorption model of the pore under unsaturated conditions was constructed to guide the durability design of the foam concrete. The factors influencing the physical and mechanical properties of foamed concrete are systematically analyzed, and the optimum strength-porosity structure model is established, which provides a theoretical basis for the design of foamed concrete proportioning. The experimental results show that the lightweight foamed concrete with bulk density grade of 400Kg~600Kg/m3 has excellent performance, high stability and good adhesion to gypsum board, which can meet the requirements of engineering application.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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本文編號：1968329