【摘要】：近年來,我國的畜禽養(yǎng)殖業(yè)已逐漸向東北地區(qū)轉(zhuǎn)移,而我國東北地區(qū)冬季寒冷而漫長,寒冷的環(huán)境使飼料轉(zhuǎn)化率和畜禽類的生產(chǎn)性能降低,因此,冬季的畜禽舍保溫很重要。如何減小畜禽舍內(nèi)的溫度波動,減慢舍內(nèi)溫度的散失,滿足畜禽類生長發(fā)育的需求,是目前亟待解決的問題。發(fā)泡混凝土自保溫砌塊的多孔結(jié)構(gòu),賦予其質(zhì)輕和優(yōu)異的保溫性能,同時作為無機保溫材料,更具有耐火阻燃的特性。所以在鋼結(jié)構(gòu)的畜禽舍內(nèi),合理使用發(fā)泡混凝土自保溫砌塊作為保溫隔熱材料,是改善畜禽舍熱環(huán)境的一個很好的方法。本論文通過文獻查閱和前期試驗,篩選出濃度為27%的雙氧水作為發(fā)泡劑,水泥、粉煤灰為膠凝材料,硬脂酸鈣、聚羧酸等外加劑制備發(fā)泡混凝土。然后將密度等級為200、250、300的發(fā)泡混凝土芯材和密度等級為500、700、900的發(fā)泡混凝土基材進行復(fù)合,復(fù)合基材的厚度分別為25 mm、30 mm、35 mm,選用正交設(shè)計49L(3),安排試驗方案制作九組發(fā)泡混凝土自保溫砌塊,通過試驗的測試及數(shù)據(jù)分析,確定最佳復(fù)合參數(shù)。根據(jù)對發(fā)泡混凝土自保溫砌塊的力學(xué)性能、熱工性和抗凍性等指標的數(shù)據(jù)測試與處理,分析得出:(1)隨著發(fā)泡混凝土容重的增加,其抗壓強度和導(dǎo)熱系數(shù)都在增大,保溫性能越來越差,質(zhì)量吸水率降低,但體積吸水率變化不大;(2)經(jīng)過對測試的數(shù)據(jù)進行分析得出,第1組(芯材為200 kg/m3、基材為500 kg/m3、壁厚為25 mm)、第4組(250 kg/m3、500 kg/m3、35 mm)和第7組(300 kg/m3、500 kg/m3、30 mm)試驗砌塊的平均導(dǎo)熱系數(shù)為0.5548 W/(m·k),平均抗壓強度為0.99 MPa,雖然滿足導(dǎo)熱系數(shù)的要求,但抗壓強度過低;(3)基材的容重不應(yīng)低于700 kg/m3、否則其抗壓強度難以達到標準的要求;(4)第三組(200 kg/m3,900 kg/m3,35 mm)、第六組(250 kg/m3,900 kg/m3,30 mm)和第九組(300 kg/m3,900 kg/m3,25 mm)的試塊,經(jīng)過50次凍融循環(huán)后,其抗壓強度損失率最低,即基材的容重對復(fù)合砌塊的整體凍融循環(huán)強度損失的影響最大;(5)在正交試驗多指標實驗分析中,通過綜合平衡分析法得出,試驗的優(yōu)水平是芯材的容重為250 kg/m3、基材的容重為900 kg/m3、壁厚為30 mm;為發(fā)泡混凝土自保溫砌塊的后續(xù)制作提供了依據(jù)。本文從新型材料角度,研制開發(fā)出一種低密度發(fā)泡水泥自保溫砌塊,通過配合比的優(yōu)化及保溫性能、力學(xué)性能及抗凍性的測定,綜合評定了該新型自保溫砌塊的使用價值及應(yīng)用前景,為實際工程中自保溫砌塊的研發(fā)應(yīng)用提供充足的理論支持。
[Abstract]:In recent years, the livestock and poultry breeding industry in China has gradually transferred to Northeast China, but the winter in Northeast China is cold and long. The cold environment reduces the feed conversion rate and the production performance of livestock and poultry. Therefore, it is very important for livestock and poultry houses to keep warm in winter. How to reduce the temperature fluctuation in livestock and poultry houses, slow down the temperature loss in the houses, and meet the needs of livestock and poultry growth and development, is an urgent problem to be solved at present. The porous structure of foamed concrete self-insulation block endows it with light weight and excellent thermal insulation performance. At the same time, as inorganic thermal insulation material, it has the characteristics of fire resistance and flame retardancy. Therefore, it is a good method to improve the thermal environment of livestock and poultry house by reasonably using foamed concrete self-insulation block as thermal insulation material in steel structure livestock and poultry house. In this paper, 27% hydrogen peroxide was selected as foaming agent, cement, fly ash as cementitious material, calcium stearate, polycarboxylic acid and other admixtures to prepare foamed concrete through literature review and previous experiments. Then the foamed concrete core material with density grade 200250300 and the foamed concrete substrate with density grade 500700900 were combined. The thickness of the composite substrate was 25 mm,30 mm,35 mm, and the orthogonal design was 49L (3). Nine groups of foamed concrete self-insulation blocks were made by arranging the test scheme, and the optimum composite parameters were determined through the test and data analysis. According to the data test and processing of mechanical properties, thermal property and frost resistance of foamed concrete self-insulation block, it is concluded that: (1) with the increase of bulk density of foamed concrete, the compressive strength and thermal conductivity of foamed concrete are increasing. The heat preservation performance is getting worse and worse, and the mass water absorption decreases, but the volume water absorption does not change much. (2) through the analysis of the test data, it is concluded that the first group (the core material is 200 kg/m3, substrate is 500 kg/m3, wall thickness is 25 mm),). The average thermal conductivity of test blocks in group 4 (250 kg/m3500 kg/m3,35 mm) and group 7 (300 kg/m3500 kg/m3,30 mm) was 0.5548 W / (m 路k),). The average compressive strength was 0.99 MPa, which met the requirements of thermal conductivity. But the compressive strength is too low; (3) the bulk density of the substrate should not be less than 700 kg/m3, otherwise the compressive strength of the substrate is difficult to meet the requirements of the standard; (4) after 50 freeze-thaw cycles, the compressive strength loss rate of the third group (200 kg/m3900 kg/m3,35 mm), group 6 (250 kg/m3900 kg/m3,30 mm) and group 9 (300 kg/m3900 kg/m3,25 mm) was the lowest. That is to say, the bulk density of the base material has the greatest influence on the overall freeze-thaw cycle strength loss of the composite block. (5) in the multi-index experimental analysis of orthogonal test, through the comprehensive balance analysis method, it is concluded that the optimum level of the test is that the bulk density of the core material is 250 kg/m3, the bulk density of the substrate is 900 kg/m3, and the wall thickness is 30 mm;. It provides the basis for the subsequent manufacture of foamed concrete self-insulation block. In this paper, a kind of low density foamed cement self-insulation block is developed from the point of view of new material. Through the optimization of mix proportion and the determination of thermal insulation performance, mechanical properties and frost resistance, The application value and application prospect of the new type of self-insulation block are comprehensively evaluated, which provides sufficient theoretical support for the research and development and application of self-thermal insulation block in practical engineering.
【學(xué)位授予單位】：吉林農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S815.9

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本文編號：2477736