本文選題：粉煤灰加氣混凝土　切入點：全曲線　出處：《長沙理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著國家的發(fā)展及能源的巨大消耗，建筑節(jié)能已占有十分重要的地位，對新型墻體節(jié)能材料已有新的需求。本文對新型節(jié)能墻體材料蒸壓粉煤灰-砂加氣混凝土進(jìn)行基本的力學(xué)性能研究，并對其進(jìn)行單軸受壓應(yīng)力-應(yīng)變?nèi)�試驗，分析研究其本構(gòu)關(guān)系，研究了其砌體的力學(xué)性能等。本文主要的研究內(nèi)容如下： （1）研究了蒸壓粉煤灰-砂加氣混凝土的基本力學(xué)性能，進(jìn)行了立方體抗壓強(qiáng)度試驗和軸心抗壓強(qiáng)度試驗；根據(jù)相關(guān)試驗結(jié)果和破壞形式，建立了軸心抗壓強(qiáng)度與立方體抗壓強(qiáng)度的關(guān)系式，抗壓強(qiáng)度與試件尺寸之間的關(guān)系式及軸力抗壓強(qiáng)度與干密度的關(guān)系式； （2）對蒸壓粉煤灰-砂加氣混凝土的單軸受壓應(yīng)力-應(yīng)變?nèi)�的試驗方法進(jìn)行了設(shè)計，說明其試驗原理及方案設(shè)計的可行性。通過對試驗測試結(jié)果進(jìn)行分析研究，得出其破壞過程分上升段和下降段分別進(jìn)行描述，分析試件的破壞形式；給出蒸壓粉煤灰-砂加氣混凝土的全曲線試驗曲線圖，對單軸受壓應(yīng)力-應(yīng)變?nèi)�的幾何特征進(jìn)行分析，并與混凝土全曲線比較異同； （3）對影響蒸壓粉煤灰-砂加氣混凝土的相關(guān)參數(shù)進(jìn)行了試驗研究，主要包括軸心抗壓強(qiáng)度、試件尺寸及含水率與彈性模量的關(guān)系，峰值應(yīng)變與抗壓強(qiáng)度的關(guān)系及泊松比的取值等。對單軸受力應(yīng)力-應(yīng)變?nèi)�本構(gòu)方程進(jìn)行研究，將全曲線分為上升和下降段，，其中下降段分為下降段和斜直線段；上升段采用五次方程描述，下降段的兩部分分別用不同的有理式表示，并對其連續(xù)性、分界點及計算值與試驗值的符合情況進(jìn)行了相應(yīng)的研究； （4）對蒸壓粉煤灰-砂加氣混凝土砌體抗壓強(qiáng)度試驗進(jìn)行了研究，分析抗壓試件的破壞特征；對砌體抗壓強(qiáng)度進(jìn)行統(tǒng)計分析，得出灰縫厚度、尺寸等對砌體抗壓強(qiáng)度的影響；根據(jù)擬合公式得出的抗壓強(qiáng)度平均值與試驗值比較吻合，得出了試驗試塊的設(shè)計值、標(biāo)準(zhǔn)值；根據(jù)統(tǒng)計數(shù)據(jù)導(dǎo)出的計算公式得出的設(shè)計值均較規(guī)程值大，說明計算公式可行且更安全； （5）研究了蒸壓粉煤灰-砂加氣混凝土砌體沿通縫彎曲抗拉強(qiáng)度試驗，并對試驗現(xiàn)象的破壞特征和破壞形態(tài)進(jìn)行了闡述，得出了相應(yīng)的試驗結(jié)果。采用粘結(jié)劑砌塊要比采用普通砂漿砌塊的彎曲抗拉強(qiáng)度要提高20%，得出了沿通縫彎曲抗拉強(qiáng)度的平均值，式中的K4值與試驗數(shù)據(jù)結(jié)果基本相符，對于沿通縫彎曲抗拉強(qiáng)度標(biāo)準(zhǔn)值與設(shè)計值，建議采用粘結(jié)劑砌筑蒸壓粉煤灰-砂加氣混凝土砌塊砌體。
[Abstract]:With the development of the country and the huge consumption of energy, building energy conservation has played a very important role. In this paper, the basic mechanical properties of autoclaved fly-ash sand aerated concrete are studied, and the uniaxial compression stress-strain full curve test is carried out. The constitutive relation and mechanical properties of masonry are analyzed and studied. The main contents of this paper are as follows:. 1) the basic mechanical properties of autoclaved fly-ash sand aerated concrete are studied, and the cube compressive strength test and axial compressive strength test are carried out. The relationship between axial compressive strength and cube compressive strength, between compressive strength and specimen size, and between axial compressive strength and dry density is established. (2) the test method of the stress-strain curve of autoclaved fly-ash sand aerated concrete under uniaxial compression is designed, and the principle of the test and the feasibility of the scheme design are illustrated. The test results are analyzed and studied. The failure process is described in ascending section and descending section, and the failure form of the specimen is analyzed, and the curve curve of autoclaved fly-ash sand aerated concrete is given. The geometric characteristics of the full stress-strain curve under uniaxial compression are analyzed and compared with the whole curve of concrete. The related parameters affecting autoclaved fly-ash sand aerated concrete are studied, including axial compressive strength, the relationship between specimen size, moisture content and elastic modulus. The relationship between peak strain and compressive strength and Poisson's ratio. The constitutive equation of stress-strain curve under uniaxial stress is studied. The whole curve is divided into ascending and descending segments, in which the descending section is divided into descending section and oblique straight section. The ascending stage is described by the quintic equation, the two parts of the descending section are expressed by different rational expressions, and the continuity, the boundary point and the coincidence between the calculated value and the experimental value are studied. 4) the compressive strength test of autoclaved fly-ash sand aerated concrete masonry is studied, and the failure characteristics of compressive concrete are analyzed, and the influence of the thickness and size of ash seam on the compressive strength of masonry is obtained by statistical analysis of the compressive strength of masonry. The average value of compressive strength obtained from the fitting formula is in good agreement with the test value, and the design value and standard value of the test sample are obtained, and the design values derived from the calculation formula derived from the statistical data are all larger than those of the standard value. It shows that the formula is feasible and safer. The bending tensile strength test of autoclaved fly-ash sand aerated concrete masonry along the pass joint is studied, and the failure characteristics and failure modes of the test phenomenon are described. The corresponding test results are obtained. The bending tensile strength of the binder block is 20 higher than that of the ordinary mortar block. The average value of bending tensile strength along the pass joint is obtained, and the K4 value in the formula is basically consistent with the test data. For the standard value and design value of flexural tensile strength along the pass joint, it is suggested to use binder to build autoclaved fly-ash sand aerated concrete block masonry.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU528

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