大轻质泡沫混凝土研究报告

轻质泡沫混凝土

配制与性能研究组员：xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx指导教师：xxxxxx主要内容1.1背景及现状近年来，由于泡沫混凝土有着质轻等各种优点，关于泡沫混凝土的研究正逐渐热门化；国外发达国家由于研究较早，其技术已比较成熟，应用相当广泛；国内已经开始研究和应用，但普遍存在着强度不高等缺点，一些技术问题也亟待解决。1.2特性及应用1.3试验目的节能减废保护环境---加气混凝土碎粒和泡沫剂；配制轻质保温隔热混凝土，满足设计要求；正交设计---湿密度、再生轻质粒体积掺量和粉煤灰掺量1.4设计指标强度等级：0.5~4MPa工作性：粘聚性和保水性良好，不分层离析泌水，坍泡少导热系数：小于0.065~0.90W/m·K2.1原材料2.2设计过程配制轻质保温隔热混凝土泡沫剂改变孔结构，形成封闭孔轻集料节能减废保护环境---加气混凝土碎粒和泡沫剂,减少原料用量；正交设计—湿密度、再生轻质粒体积掺量和粉煤灰掺量2.2设计过程—试拌问题坍泡太多！发泡剂：掺量过多—20g发泡倍数—1：2速凝剂加料，水泥未水化，吸水水流失太快2.2设计过程—调整发泡剂减少到—6g加水—1：25泡沫加入到水泥浆中速凝剂作为一个因素（2组）模具涂油后擦掉，防坍泡—试件表面破坏模具底垫薄膜，减少水渗—效果不大2.3最终配合比（一）试验编号湿密度kg/m3水泥kg/m3粉煤灰kg/m3轻质料用量kg/m3泡沫L水kg/m3水灰比123456789450----600----750----4003603203603204003204003600408004080040800170340170340034001701.20.90.61.20.90.61.20.90.6200----180----160----0.5----0.45----0.4----最终配合比（二）试验号水泥kg/m3粉煤灰kg/m3轻质料用量kg/m3泡沫L水kg/m3水灰比速凝剂(%)1234567894003603204003603204003603200408004080040800170340170340034001701.20.90.61.20.90.61.20.90.6200----180----160----0.5----0.45----0.4----2----------------成型工艺搅拌发泡制备水泥流态浆体加泡沫调整湿容重成型养护测试：导热系数：CD-DR3030A导热系数测定仪吸声系数：超声波2.4实验试样2.4试验结果（一）试验号湿容量kg/m3干容重kg/m3吸水率(%)导热系数λw/m·k抗压强度（MPa）7d软化系数k7d28d12345678954656066061574066080074071050851959261167859866472967733.932.030.819.234.621.136.515.518.10.11630.18080.15570.12460.12070.16600.11800.14870.11460.980.750.930.491.362.203.281.911.221.531.903.572.443.262.663.853.043.061.371.091.433.240.940.580.720.920.95收缩数据试验号3d（mm）5d（mm）7d（mm）14d（mm）14d（mm）28d（mm）1234567890.70900.65000.68050.66900.68950.62000.75500.52150.82850.53650.52150.68050.58700.59500.56500.51550.43800.79500.41900.41000.65850.52000.57800.45900.49850.37250.70850.11750.10950.53600.12200.46950.23850.42900.23600.56250.18500.18300.52300.09700.45000.20800.41100.21300.53800.17100.18700.52200.09600.44900.21200.38600.23500.5260实验结果（二）试验号湿容量(kg/m3)干容重(kg/m3)吸水率(%)吸声系数а抗压强度（MPa）7d28d12345678952053453161065063069078075043075052058955558060867862910.9-19.712.318.28.6216.29.0814.70.04460.08160.08470.02910.04570.14480.09440.08880.09141.223.152.891.422.541.142.891.111.093.064.794.293.863.272.674.593.674.673.1数据处理—极差分析软化系数吸声系数a×10-27d抗压强度（一）7d抗压强度（二）ABCDABCDABCDABCDK13.895.332.873.2621.116.827.818.22.664.755.093.567.255.523.464.84K24.762.955.282.3922.021.620.232.14.054.022.466.235.106.805.667.18K32.592.963.095.5927.532.122.520.36.414.355.573.335.095.128.325.42k11.301.780.961.097.035.609.276.060.891.581.701.192.421.841.151.61k21.590.981.760.807.327.206.7410.71.351.340.822.081.702.271.892.39k30.860.981.031.869.1510.77.496.752.141.451.861.111.701.712.771.81极差0.730.800.801.062.125.102.534.041.250.241.040.970.720.561.620.78最优比A3B2C1A3B3C1A3B1C3A1B2C33.1数据处理—极差分析吸水率%导热系数w/m·k28d抗压强度（一）28d抗压强度（二）ABCDABCDABCDABCDK196.789.670.586.60.4530.3590.4310.3527.007.827.237.8512.111.519.4011.00K274.982.169.389.60.4110.4500.4200.4658.368.207.408.419.8011.7313.3212.05K370.170.0101.967.40.3810.4360.3940.4299.959.2910.79.0512.911.6312.1511.82k132.229.923.528.90.1510.1200.1440.1172.332.612.412.624.053.843.133.67k225.027.423.129.90.1370.1500.1400.1552.792.732.472.803.273.914.444.02k323.423.334.022.50.1270.1450.1320.1433.323.103.563.024.313.884.053.94极差8.86.610.97.40.0240.0300.010.040.990.491.150.401.040.071.310.35最优比A3B3C2A3B1C3A3B3C3A1B2C2误差分析试件缺陷坍泡多，泡沫尺寸大搅拌不均匀模具试件选取成型，同组不同锅试样选取，不同模具测量误差3.3图表分析3.3各因素对收缩率影响3.3图表分析3.4结论速凝剂有利于强度提高及形貌优化