工艺参数对纤维水泥板物理化学性能的影响.pdf

1 EFFECTS OF PROCESS PARAMETERS EFFECTS OF PROCESS PARAMETERS ON PON PHYSICAL AND MECHANICAL HYSICAL AND MECHANICAL PROPERTIES OFPROPERTIES OF FIBERFIBER CEMENT CEMENT SHEETSSHEETS H H lya lya K Kusus ITU Istanbul TurkeyITU Istanbul Turkey E Emmi in n zgzg r r Atermit Gebze TurkeyAtermit Gebze Turkey V Vanderley anderley MM J Johnohn USP S o Paulo BrazilUSP S o Paulo Brazil 1010 th th International Inorganic Bonded Composite Materials Conference International Inorganic Bonded Composite Materials Conference IIBCC November 15IIBCC November 15 18 2006 S o Paulo18 2006 S o Paulo OutlineOutline IntroductionIntroduction Factors affecting performance and durabilityFactors affecting performance and durability Test samples Test samples Production process parametersProduction process parameters Performance tests and analysisPerformance tests and analysis BendingBending Layer bondingLayer bonding SEMSEM Nitrogen desorptionNitrogen desorption Water absorptionWater absorption Conclusions Conclusions Future workFuture work 工艺参数对纤维水泥板物理 化 学性能的影响 概 要 简介 影响性能与寿命的因素 测试样品 生产工艺参数 性能测试与分析 弯曲 料层粘连 吸水性 总结 后续工作 氮解吸附作用 2 IntroductionIntroduction The main objective of this study is to gain information on The main objective of this study is to gain information on the interrelation between drying shrinkage and the the interrelation between drying shrinkage and the influence of production process parameters in terms of influence of production process parameters in terms of porosity porosity Lower modulus of rupture excessive water absorption Lower modulus of rupture excessive water absorption high rates of drying shrinkage which may lead to high rates of drying shrinkage which may lead to high high porosityporosity crack formationcrack formation delaminationdelamination etc can be etc can be regarded as durability issues linked to process regarded as durability issues linked to process parameters parameters The sheets produced at maximum and minimum values The sheets produced at maximum and minimum values of various process parameters were investigated through of various process parameters were investigated through mechanical and physical testmechanical and physical tests and microstructure s and microstructure analysis analysis F Factorsactors affecting performance durabilityaffecting performance durability Characteristics of constituent materialsCharacteristics of constituent materials FibersFibers PVA cellulose PVA cellulose MatrixMatrix cement cement FillersFillers silica fume silica fume P Process agentsrocess agents flocculants anti flocculants anti foam agents foam agents MMix proportionsix proportions Production process conditions Production process conditions Slurry temperatureSlurry temperature Felt speedFelt speed Line pressureLine pressure Number of layersNumber of layers C Curing conditionsuring conditions E Environmental exposure conditionsnvironmental exposure conditions etc etc 简 介 多孔性产品工艺参数的影响 与干缩之间的相互关系是这 次研究的主要目的 断裂低系数 吸水性过剩 干缩高比 率可导致严重多孔性 裂纹 分层 等 该问题可可看成与工艺参数有 关的产品寿命问题 以最大和最小变化的工艺参数 生产的板材 将经过机械物理测 试及微观结构分析 影响性能与寿命的因素 原料成分特点 水泥内部结构 PVA 纤维 添加剂 微硅粉 工艺药剂 絮凝剂 消泡剂 配比 生产工艺条件 料将温度 毛毡速度 线压力 产品层数 养护条件 周围环境条件 等等 3 Mix proportionsMix proportions 89 589 5 cement cement 3 53 5 cellulose fibers cellulose fibers 2 2 PVA PVA 3 3 silica fume silica fume 2 2 sepiolite sepiolite Group A samplesGroup A samples from the midfrom the mid Group B samplesGroup B samples from the cracked edgefrom the cracked edge Codes and process parametersCodes and process parameters 140140300300 7 7 333344 844 84545Standard Standard B B 220220200200 7 7 333344 844 84545Normal number of layersNormal number of layersA11A11 220220200200 9 9 333344 844 84545High number of layersHigh number of layersA10A10 140140300300 7 7 1919 45 045 04545Low line pressureLow line pressureA7A7 140140300300 7 7 3636 45 045 04545High line pressureHigh line pressureA6A6 140140300300 7 7 3333 50 050 0 4545High felt speedHigh felt speedA5A5 140140300300 7 7 3333 32 032 0 4242Low felt speedLow felt speedA4A4 140140300300 7 7 333344 744 7 4141 Normal conditionsNormal conditionsA3A3 140140300300 7 7 333344 744 7 3131 Low Slurry TemperatureLow Slurry TemperatureA2A2 2 2 1 1 VacuumVacuum Number Number of Layersof Layers Line Line Pressure Pressure kg cm kg cm Felt Speed Felt Speed m min m min Temperature Temperature of Slurry of Slurry C C Control ParametControl Parameter erCodeCode 配 比 水泥 纤维 聚乙烯醇 微硅粉 海泡石 断裂边的B组样品 代码及工艺参数 代码参数控制 浆料温度 毛毡速度 线压力 产品层数 中间A 组样品 真空 低温浆料 正常温度 低毛毡速度 高毛毡速度 高线压 低线压 多料层 正常料层 标准 4 4 4 pointpoint b bending ending Wet conditioned samplesWet conditioned samples 16 samples from 4 different sheets16 samples from 4 different sheets 3030 mm mm 150150 mm mm 6 6 mmmm Delamination after bendingDelamination after bendingU Universal testing machineniversal testing machine Flexural strengthFlexural strength B B A11A11 A10A10 A7A7 A6A6 A5A5 A4A4 A3A3 A2A2 4 274 2710 6310 63 Standard Standard 6 046 0412 3012 30Normal number of layersNormal number of layers 7 337 3312 7812 78High number of layersHigh number of layers 6 296 2912 8212 82Low line pressureLow line pressure 7 127 1214 4514 45High line pressureHigh line pressure 5 875 8714 7714 77High felt speedHigh felt speed 7 507 5013 3413 34Low felt speedLow felt speed 7 657 65 13 4213 42 Normal conditionsNormal conditions 7 717 7115 1315 13 Low Slurry TemperatureLow Slurry Temperature Specific Energy Specific Energy KJ m KJ m Flexure stress at Flexure stress at Maximum Flexure loadMaximum Flexure load MOR MPa MOR MPa 4 点 弯 曲 普 通 测 试 仪 器 弯 曲 后 分 层 湿 样 4张不同板材上的 16 张样品 弯 曲 力 最大弯曲负荷下的弯 曲压力 能 量 低温浆料 正常条件 低毛毡速度 多 料 层 低 线 压 高 线 压 高毛毡速度 正常料层 标 准 5 Stress Stress deflection curvesdeflection curves Sample A3Sample A3Sample BSample B Sample A3 0 2 4 6 8 10 12 14 16 18 05101520253035 Deflection mm Stress MPa Sample B 0 2 4 6 8 10 12 14 16 18 05101520253035 Deflection mm Stress MPa Layer Layer b bonding pull off onding pull off 0 830 831339 141339 145 795 79 B B 0 830 831307 571307 575 625 62 A11A11 1 071 071659 871659 876 076 07 A10A10 0 820 821293 911293 916 056 05 A7A7 0 730 731143 981143 985 705 70 A6A6 0 920 921430 231430 235 815 81 A5A5 0 630 63996 95996 956 126 12 A4A4 0 870 871363 901363 905 965 96 A3A3 1 701 702696 102696 105 285 28 A2A2 Strength Strength MPa MPa L Load N oad N Thickness Thickness mm mm 压 力 变 化 曲 线 料层粘力 脱出 厚 度 力 度 负 荷 样品A 3 样品A 3 样品B 样品B 压力压力 变化变化 6 2696 1364 997 1430 1144 1294 1660 13081339 0 87 0 63 0 92 0 73 0 82 1 07 1 70 0 83 0 83 0 600 1200 1800 2400 3000 A2A3A4A5A6A7A10A11B Load N 0 0 0 4 0 8 1 2 1 6 2 0 Strength MPa Load N Strength MPa Layer bonding pull off Layer bonding pull off Layer bonding SEM Layer bonding SEM Good layer bondingGood layer bonding Sample A2Sample A2 Weak layer bondingWeak layer bonding Sample A4Sample A4 料层粘力 脱出 负荷 力度 负荷 力度 料层粘力 层间粘力良好 样品A 2 层间粘力不良 样品A 4 7 Fiber distributionFiber distribution High porosity at the surface zone High porosity at the surface zone 纤 维 布 向 表面多孔现象 8 Fiber bonding cellulose and PVA Fiber bonding cellulose and PVA Silica fumeSilica fume 纤维粘力 纤维和聚乙烯醇 微 硅 粉 9 PorosityPorosity nitrogen desorption 0 00 0 01 0 02 0 03 0 04 0 05 0 06 02004006008001000 Average Diameter Incremental Pore Volume cm g A2 A3 A4 A5 B Pore size classificationPore size classification IUPAC IUPAC 500 500 macromacro Water absorptionWater absorption 8 10 12 14 16 18 20 22 050100150200250300350400 Time h Water absorption by weight A2 Low Slurry Temp A3 Normal Conditions A4 Low Felt Speed A5 High Felt Speed A6 High Line Pressure A7 Low Line Pressure A10 High Number of Layers A11 Normal Number of Layers 多孔性 氮解 吸附作用 小孔尺寸分类 小孔体积上升 平均直径 吸水性 低温浆料 正常条件 低毛毡速度 高毛毡速度 高 线 压 低 线 压 多 料 层 正常料层 正常料层 时间 小时 10 Maximum water absorption amounts of samples in Group A 13 00 17 03 16 30 14 85 14 14 18 28 20 67 20 39 0 4 8 12 16 20 24 A2A3A4A5A6A7A10A11 Max water absorption by weight ConclusionsConclusions Overall results in general show a good correlation between Overall results in general show a good correlation between mechanical and physical properties and the microstructural mechanical and physical properties and the microstructural characteristics characteristics The most effective process parameter The most effective process parameter in material properties in material properties was was found to be the found to be the slurry temperatureslurry temperature A2 A2 A3 A3 Sample A2 low slurry temperature demonstrated superior mechaniSample A2 low slurry temperature demonstrated superior mechanical cal and physical properties among all others and physical properties among all others The least effective process parameter was found to be the The least effective process parameter was found to be the number of layersnumber of layers A10 A10 A11 A11 T The mechanical and physical properties were relatively lower thanhe mechanical and physical properties were relatively lower than the the other samples except for the layer bonding strength other samples except for the layer bonding strength Line pressureLine pressure has considerable effect on flexural strength and has consider