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大掺量矿物掺合料复合水泥浆体的化学结合水与孔结构的研究(热重法与孔结构)资料

发布时间：2023-03-10 05:37:29 来源：文档文库

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大掺量矿物掺合料复合水泥浆体的化学结合水与孔结构的研究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系结构形成的贡献、研究反应动力学等具有重要意义。本论文以复掺硅灰、粉煤灰的水泥浆体为研究对象，通过测定掺粉煤灰和硅灰复合水泥浆体不同龄期的非蒸发水量来了解粉煤灰和硅灰对水泥水化过程的影响。实验用简单干燥的方法测量非蒸发水量。随着水化龄期的增加，初期非蒸发水含量逐渐上升，随后略有下降，后期非蒸发水含量又逐渐增加；随着硅灰含量的增加，早起水化速率逐渐增加；粉煤灰有助于水泥后期水化进程。同时利用氮吸附法测量水泥石孔结构，从而在微观孔结构和宏观干缩建立了关联。加入硅灰和粉煤灰都极大的改善了孔径分布，使孔径范围不断缩小，硅灰和粉煤灰皆具有填充效应，在水化早期硅灰对孔结构的影响主要是水化反应生成硅酸钙凝胶，粉煤灰在早期则起着填充效应，实验表明它们对改善0-20nm范围的孔径尤为显著。关键词：硅灰、粉煤灰、非蒸发水、复合水泥浆体、孔结构。3
安徽建筑工业学院本科生毕业设计AbstractFlyashandsilicafumehavebecomeabsolutelynecessarilybindingmaterialsincementindustry.Tomakesurethereactiondegreeofflyashandsilicafumeincementpastesisveryimportant.Itissignificantinevaluatingthereactiveactivityofflyashandsilicafume,estimatingthecontributiontothestructure，researchingthereactivekinetics.Thisthesisactedcomplex-dopedsilicafume,flyashcementpasteastheresearchobjectbymeasuringthenon-evaporativewateroftheflyashandsilicafumecementpastecompositeofdifferentagesunderstoodtheroleoftheflyashandsilicafumeinthecementhydrationprocess.Theexperimentusedasimplemethodofdryingtomeasurenon-evaporativewaterweightoftheflyashandsilicafumecementpastecompositeofdifferentages.Themethodcamewiththehydrationincreased,theinitialnon-evaporatingthewatercontentincreasedgradually;thendecreasedslightly,thenon-evaporatingthewatercontenthasincreasedgraduallyinthelatehydrationprocess;theearlyhydrationrategraduallyincreasedwithsilicafumecontentincreasing;flyashcontributetothelatecementhydrationprocess.Observedbyscanningelectronmicroscopyexperimentsthatthereactiontimeofflyashinthecompositepastewasverylongandthesilicafumecouldquicklyrespondtothecementhydrationproducts.AndporestructureofcementpastewasobservedbyusingN2adsorptionmeasurement,theseresultscouldestablisharelevancebetweenthemicroporestructureandmacroscopicaldryingshrinkage.Addingsilicafumeandflyashhavegreatlyimprovedtheporesizedistribution.Theporesizerangeisshrinkingwithfillingeffectofsilicafumeandflyash.Intheearlyhydrationofsilicafumeonporestructureofthehydrationreactionismainlycalciumsilicategel,flyashisplayedintheearlyfillingeffect,experimentsshowthattheyimprovetherangeof0-20nmporesizeisparticularlysignificant.Keywords:Silicafume,Flyash,non-evaporativewater,Compositecementpaste,Dryingshrinkage,Cementpasteporestructure.2

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