选择性溶解法研究大掺量矿物掺合料的复合水泥浆体中硅

2011年6月10日选择性溶解法研究大掺量矿物掺合料的复合水泥浆体中硅灰的反应程度I摘要粉煤灰和硅灰现已成为高性能水泥中必不可少的性能调节型辅助性胶凝材料，确定水泥浆体中粉煤灰或硅灰的反应程度，对评价它们的反应活性及其对该体系结构形成的贡献、研究反应动力学等具有重要意义。本文选取粉煤灰与硅灰，采用盐酸选择性溶解法测定粉煤灰和硅灰的反应程度，研究水泥浆体中粉煤灰或硅灰的反应程度与掺量的关系。实验分别对煅烧—沥滤工艺中的煅烧活化过程、溶出过程进行探究。通过对粉煤灰的活化机理进行研究，选用Na2CO3为活化剂，选择H2SO4为溶出剂。对同一掺量比粉煤灰不溶物和水泥不溶物及各个龄期复掺不溶物中铝盐含量进行研究，实验采用络合滴定法，以乙二胺四乙酸（EDTA）为络合剂有效滴定铝离子。关键词：粉煤灰，硅灰，反应程度，活化，络合剂安徽建筑工业学院本科生毕业论文IIAbstractFlyashandsilicafumehigh-performanceconcretehasbecomeanindispensablehelpertypeperformancetuningcementitiousmaterialstodeterminethecementpasteandsilicafumeinthereactionofflyashortheextentoftheevaluationoftheirreactivityandtheircontributiontotheformationofthearchitecture,kineticstudyhasimportantsignificance.Thisselectionofflyashandsilicafume,theuseofhydrochloricacidselectivedissolutionmethodforthedeterminationofthereactionofflyashandsilicafumedegreeofcementpasteandflyashorsilicafumeinthereactionoftherelationshipbetweenthedegreeandcontent.Experimentswerecalcined-leachingcalcinedintheactivationprocess,thedissolutionprocessofinquiry.ThroughtheactivationmechanismofflyashstudyNa2CO3usedasanactivator,selectH2SO4asdissolutionagent.Comparedtothesamecontentandcementflyashinsolubleinallageinsolubleandinsolubleinthealuminumdopedcompoundcontentofresearchandexperimentbycomplexometrictitrationtoethylenediaminetetraaceticacid(EDTA)ascomplexingagenteffectivetitrationaluminumion.Keywords:flyash,silicafume,thedegreeofresponse,activation,complexingagent选择性溶解法研究大掺量矿物掺合料的复合水泥浆体中硅灰的反应程度III目录第一章前言...............................................................11.1研究现状及前景...............................................................................................................11.2粉煤灰和硅灰对胶凝材料作用机理的研究现状.............................................21.2.1粉煤灰的活性................................................................................................................21.3粉煤灰、硅灰对水泥浆体的影响............................................................................51.3.1粉煤灰..................................................................................................................51.3.2硅灰......................................................................................................................71.3.3双掺粉煤灰、硅灰作用机理探讨.......................................................................81.4选择性溶解法的国内外研究动态............................................................................91.5从粉煤灰中提取氧化铝的研究现状.....................................................................10第二章研究方案、原材料、试验仪器及试验方法......................122.1试验流程..............................................................122.2试验原材料............................................................................................132.3试验仪器及试验方法............................................................................142.3.1试验仪器............................................................................................................142.3.2试验配比方案.....................................................................................................152.4水化试样反应程度测定方法....................................................................................162.4.1水化试样测定试样的准备........................................................................................162.4.2水化试样的水化程度的测定方法...........................................................................16安徽建筑工业学院本科生毕业论文IV第三章试验过程研究探讨与试验结果....................................193.1水泥、粉煤灰、硅灰烧失量及盐酸不溶物质量分数测定........................193.2粉煤灰的活化...................................................................................................................203.2.1活化的相关概念.........................................................................................................263.2.2粉煤灰活性低的原因.........................................................................................273.2.3粉煤灰的活化试验.............................................................................................273.3水泥不溶物烧结试验....................................................................................................283.4活性氧化铝的溶出.........................................................................................................293.5氧化铝滴定........................................................................................................................303.5.1试剂的配制和标定.............................................313.5.2三氧化二铁和三氧化二铝的络合配位滴定.........................333.6化学结合水含量测量实验数据和计算.................................................................373.7掺硅灰/粉煤灰的复合水泥浆体中硅灰和粉煤灰反应程度计算公式..........................................................................................................................................................383.7.1硅灰-水泥二元体系中硅灰的反应程度.................................................................383.7.2硅灰-粉煤灰-水泥三元体系中硅灰和粉煤灰的反应程度.................................40第四章结论................................................................................................................................42实验心得................................................................