基于北方寒地畜禽舍发泡混凝土自保温砌块的研制
发布时间：2019-05-15 20:30
【摘要】：近年来,我国的畜禽养殖业已逐渐向东北地区转移,而我国东北地区冬季寒冷而漫长,寒冷的环境使饲料转化率和畜禽类的生产性能降低,因此,冬季的畜禽舍保温很重要。如何减小畜禽舍内的温度波动,减慢舍内温度的散失,满足畜禽类生长发育的需求,是目前亟待解决的问题。发泡混凝土自保温砌块的多孔结构,赋予其质轻和优异的保温性能,同时作为无机保温材料,更具有耐火阻燃的特性。所以在钢结构的畜禽舍内,合理使用发泡混凝土自保温砌块作为保温隔热材料,是改善畜禽舍热环境的一个很好的方法。本论文通过文献查阅和前期试验,筛选出浓度为27%的双氧水作为发泡剂,水泥、粉煤灰为胶凝材料,硬脂酸钙、聚羧酸等外加剂制备发泡混凝土。然后将密度等级为200、250、300的发泡混凝土芯材和密度等级为500、700、900的发泡混凝土基材进行复合,复合基材的厚度分别为25 mm、30 mm、35 mm,选用正交设计49L(3),安排试验方案制作九组发泡混凝土自保温砌块,通过试验的测试及数据分析,确定最佳复合参数。根据对发泡混凝土自保温砌块的力学性能、热工性和抗冻性等指标的数据测试与处理,分析得出:(1)随着发泡混凝土容重的增加,其抗压强度和导热系数都在增大,保温性能越来越差,质量吸水率降低,但体积吸水率变化不大;(2)经过对测试的数据进行分析得出,第1组(芯材为200 kg/m3、基材为500 kg/m3、壁厚为25 mm)、第4组(250 kg/m3、500 kg/m3、35 mm)和第7组(300 kg/m3、500 kg/m3、30 mm)试验砌块的平均导热系数为0.5548 W/(m·k),平均抗压强度为0.99 MPa,虽然满足导热系数的要求,但抗压强度过低;(3)基材的容重不应低于700 kg/m3、否则其抗压强度难以达到标准的要求;(4)第三组(200 kg/m3,900 kg/m3,35 mm)、第六组(250 kg/m3,900 kg/m3,30 mm)和第九组(300 kg/m3,900 kg/m3,25 mm)的试块,经过50次冻融循环后,其抗压强度损失率最低,即基材的容重对复合砌块的整体冻融循环强度损失的影响最大;(5)在正交试验多指标实验分析中,通过综合平衡分析法得出,试验的优水平是芯材的容重为250 kg/m3、基材的容重为900 kg/m3、壁厚为30 mm;为发泡混凝土自保温砌块的后续制作提供了依据。本文从新型材料角度,研制开发出一种低密度发泡水泥自保温砌块,通过配合比的优化及保温性能、力学性能及抗冻性的测定,综合评定了该新型自保温砌块的使用价值及应用前景,为实际工程中自保温砌块的研发应用提供充足的理论支持。
[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.
【学位授予单位】：吉林农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S815.9
本文编号：2477736
[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.
【学位授予单位】：吉林农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S815.9
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