【摘要】：泡沫混凝土是眾多建筑材料中的一種，保溫隔熱性能良好，主要用作墻體材料。粉煤灰、礦渣等工業(yè)廢料可以大量用做泡沫混凝土填充材料，其研發(fā)有利于減少環(huán)境污染和提高能源利用。因此，泡沫混凝土有著很廣的經(jīng)濟(jì)價(jià)值和應(yīng)用前景。 試驗(yàn)通過選用試驗(yàn)材料、運(yùn)用試驗(yàn)方法和實(shí)行試驗(yàn)設(shè)計(jì)研制了干密度在800~1100kg/m~3，抗壓強(qiáng)度達(dá)到10~20MPa的泡沫混凝土，并使用多種材料學(xué)檢測(cè)手段，探討了其宏觀性能和微觀結(jié)構(gòu)。 研究了鋁粉摻量及粒徑對(duì)泡沫混凝土抗凍性能、導(dǎo)熱系數(shù)以及孔結(jié)構(gòu)的影響。50次凍融循環(huán)作用下，泡沫混凝土強(qiáng)度損失和質(zhì)量損失在0~0.6g鋁粉摻量時(shí)漸增，0.6~0.9g鋁粉摻量時(shí)，強(qiáng)度損失和質(zhì)量損失幾乎不變；鋁粉粒度越小，強(qiáng)度損失和質(zhì)量損失皆相對(duì)較大，且部分泡沫混凝土制品已達(dá)抗凍混凝土級(jí)別。在0~0.6g鋁粉摻量時(shí)，導(dǎo)熱系數(shù)隨摻量增加而降低，0.6~0.9g鋁粉摻量時(shí)，，導(dǎo)熱系數(shù)變化不大；鋁粉粒度越小，導(dǎo)熱系數(shù)相對(duì)較小，且泡沫混凝土制品已接近保溫材料要求。在0~0.6g鋁粉摻量時(shí)，隨著摻量的增加，泡沫混凝土孔隙率逐漸增大，0.6~0.9g鋁粉摻量時(shí)，孔隙率幾乎不變，且鋁粉粒度越小，孔隙率相對(duì)較大；在0~0.6g鋁粉摻量時(shí)，隨著摻量逐漸增加，泡沫混凝土孔徑逐漸增大，在0.6~0.9g時(shí)，孔徑變化趨于平緩，且鋁粉粒度越小，平均孔徑相對(duì)較�。�200~300μm尺寸范圍孔徑分布百分比達(dá)到60%左右，其他尺寸范圍內(nèi)百分比相差不大，孔徑分布總體上向中間值靠攏，摻不同粒徑鋁粉泡沫混凝土孔徑分布百分比相差無幾；不同摻量及粒徑鋁粉泡沫混凝土孔分布情況相似，都較均勻。 探討了泡沫混凝土抗凍性能和導(dǎo)熱系數(shù)與孔結(jié)構(gòu)的相關(guān)性。泡沫混凝土砌塊凍融循環(huán)強(qiáng)度損失和質(zhì)量損失皆隨著孔隙率和孔徑的增大而逐漸增加；其導(dǎo)熱系數(shù)隨著孔隙率和孔徑的增大而逐漸降低。
[Abstract]:Foam concrete is one of many building materials, which has good thermal insulation and is mainly used as wall material. Industrial waste, such as fly ash and slag, can be used as foam concrete filling material, and its research and development can reduce environmental pollution and improve energy utilization. Therefore, foam concrete has a wide range of economic value and application prospects. The foam concrete with a dry density of 800 ~ 1100kg / m ~ (-3) and compressive strength up to 10~20MPa was developed by selecting the test materials, using the test method and the experimental design. The macroscopic properties and microstructure of the foam concrete were also discussed by using a variety of material testing methods. The effects of aluminum content and particle size on the frost resistance, thermal conductivity and pore structure of foamed concrete were studied. Under 50 freeze-thaw cycles, the strength loss and mass loss of foamed concrete increased gradually with the addition of 0 0. 6 g aluminum powder and 0. 6% 0. 9 g aluminum powder. The loss of strength and quality is almost unchanged, and the smaller the particle size of aluminum powder is, the larger the loss of strength and quality is, and some of the foam concrete products have reached the grade of antifreeze concrete. When the amount of aluminum powder is 0 ~ 0.6g, the coefficient of thermal conductivity decreases with the increase of the amount of aluminum powder, but the coefficient of thermal conductivity changes little when the content of 0.6g aluminum powder increases, the smaller the particle size of aluminum powder is, the smaller the coefficient of thermal conductivity is, and the foamed concrete products are close to the requirement of thermal insulation material. The porosity of foamed concrete increases gradually with the increase of the content of 0 ~ 0.6g aluminum powder, and the porosity of foamed concrete increases with the increase of the amount of aluminum powder, and the smaller the particle size of aluminum powder is, the larger the porosity is, and when the content of aluminum powder increases, the porosity of foamed concrete increases gradually with the increase of the amount of aluminum powder, and the smaller the particle size of aluminum powder is, the larger the porosity is. The pore size of foamed concrete increases gradually, and when the pore size is 0.6 ~ 0.9g, the pore diameter changes slowly, and the smaller the particle size of aluminum powder, the smaller the average pore diameter is, and the pore size distribution percentage of 200 ~ 300 渭 m is about 60%, but the percentage in other dimensions is not different. As a whole, the pore size distribution of aluminum foam concrete with different particle size is similar, and the pore size distribution of aluminum foam concrete with different particle size is similar, and the pore size distribution of aluminum foam concrete with different particle size is uniform. The relationship between frost-resistance, thermal conductivity and pore structure of foamed concrete is discussed. The loss of freeze-thaw cycle strength and mass of foamed concrete block increases with the increase of porosity and pore size, and the thermal conductivity decreases with the increase of porosity and pore size.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

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