電廠稻殼灰混凝土力學(xué)及抗硫酸鹽侵蝕性能研究

電廠稻殼灰混凝土力學(xué)及抗硫酸鹽侵蝕性能研究電廠稻殼灰混凝土力學(xué)及抗硫酸鹽侵蝕性能研究

摘要：本研究使用稻殼灰作為摻合料，探究了不同摻量下電廠稻殼灰混凝土的力學(xué)性能、抗硫酸鹽侵蝕性能及其微觀結(jié)構(gòu)。得出了以下結(jié)論：（1）稻殼灰摻量對混凝土強(qiáng)度和變形能力的影響顯著，當(dāng)?shù)練せ覔搅繛?0%時，混凝土抗壓強(qiáng)度和拉伸強(qiáng)度分別下降了10.74%和6.87%；（2）混凝土的耐久性隨著硫酸鈉溶液的濃度增加呈現(xiàn)遞減趨勢，但摻入稻殼灰后，混凝土在相同環(huán)境下的硫酸鈉侵蝕傷害明顯減小；（3）透射電子顯微鏡（TEM）分析表明，稻殼灰摻量較高時可形成多孔分散狀態(tài)的水化產(chǎn)物，表明稻殼灰可以與普通水泥反應(yīng)并產(chǎn)生更多新的水化產(chǎn)物，從而提高混凝土的強(qiáng)度。

關(guān)鍵詞：稻殼灰混凝土、力學(xué)性能、抗硫酸鈉侵蝕性能、微觀結(jié)構(gòu)、摻量

Abstract:Inthisstudy,ricehuskashwasusedasadmixturetoinvestigatethemechanicalproperties,resistancetosulfateattack,andmicrostructureofricehuskashconcretewithdifferentcontent.Thefollowingconclusionswereobtained:(1)Thecontentofricehuskashhasasignificantimpactonthestrengthanddeformationcapacityofconcrete.Whenthecontentofricehuskashis20%,thecompressivestrengthandtensilestrengthofconcretedecreaseby10.74%and6.87%,respectively;(2)Thedurabilityofconcretedecreaseswiththeconcentrationofsodiumsulfatesolution,butthedamagecausedbysodiumsulfateerosionissignificantlyreducedafteraddingricehuskash;(3)Transmissionelectronmicroscopy(TEM)analysisshowsthatricehuskashcanformaporousanddispersedstateofhydrationproductswhenthecontentishigh.Thisindicatesthatricehuskashcanreactwithordinarycementtoproducemorenewhydrationproducts,therebyimprovingthestrengthofconcrete.

Keywords:ricehuskashconcrete,mechanicalproperties,resistancetosodiumsulfateattack,microstructure,contentRicehuskash,aby-productofricemilling,isapromisingadditiontoconcreteduetoitspozzolanicproperties.Ithasbeenfoundthataddingricehuskashtoconcretecansignificantlyimproveitsmechanicalpropertiesandreduceitssusceptibilitytosulfateattack.

Onestudyfoundthatincreasingthecontentofricehuskashinconcreteledtohighercompressiveandflexuralstrength,aswellasareductioninwaterabsorptionandporosity.Theresearchersattributedtheseimprovementstothepozzolanicreactionbetweenthericehuskashandthecement,whichproducedadditionalcementitiouscompoundsanddensifiedtheconcretematrix.

Anotherstudyinvestigatedtheeffectofricehuskashontheresistanceofconcretetosulfateattack.Sulfateattackcanoccurwhenconcreteisexposedtosoilsandwatercontaininghighlevelsofsulfates,whichcanreactwiththecementpasteandleadtocracking,expansion,anddeterioration.Thestudyfoundthataddingricehuskashtoconcretesignificantlyreducedtheexpansionandcrackingcausedbysulfateattack,indicatingthatitcanimprovethedurabilityofconcreteinharshenvironments.

Transmissionelectronmicroscopyanalysishasalsoprovidedinsightsintothemicrostructureofricehuskashconcrete.Athigherlevelsofricehuskashcontent,thehydrationproductsofthecementexhibitedamoredispersedandporousstate,indicatingthatthericehuskashcanreactwiththecementtoformadditionalcementitiouscompounds.Thiscanenhancethestrengthanddurabilityofconcretebycreatingamoretightlypackedandinterlockingmatrix.

Overall,incorporatingricehuskashintoconcretehasshowngreatpotentialinimprovingitsmechanicalproperties,resistancetosulfateattack,andmicrostructure.Theoptimalcontentofricehuskashvariesdependingonthespecificapplicationandmixdesign,butresearchershavegenerallyfoundthataddingupto20%ricehuskashbyweightcanproducesignificantimprovementsinconcreteperformanceInadditiontoimprovingthemechanicalpropertiesanddurabilityofconcrete,theuseofricehuskashalsohaspotentialenvironmentalbenefits.Ricehuskashisabyproductofricemilling,anditsutilizationinconcretereduceswasteandcanpotentiallylowergreenhousegasemissions.

Anotherpotentialapplicationforricehuskashisinsoilstabilization.Soilstabilizationinvolvesaddingmaterialstosoiltoimproveitsstrengthandstability,whichisimportantforconstructionprojectsandinfrastructuredevelopment.Studieshaveshownthataddingricehuskashtosoilcanimproveitscompressivestrength,reduceitsplasticity,andincreaseitsresistancetowatererosion.

Furthermore,ricehuskashcanalsobeusedasasourceofsilicaintheproductionofhigh-performanceconcrete.Silicaisanimportantcomponentinconcrete,asitreactswithcalciumhydroxidetoproducecalciumsilicatehydrate,whichisresponsibleforthestrengthanddurabilityofconcrete.Thesilicainricehuskashishighlyreactiveandcanpotentiallyproduceevenstrongerandmoredurableconcretethantraditionalsourcesofsilica.

Despitethepotentialbenefitsofusingricehuskashinconcreteandsoilstabilization,therearealsosomechallengesandlimitationstoitsuse.Onemajorchallengeisthevariabilityinqualityandcompositionofricehuskash,dependingonfactorssuchasthetypeofrice,thelocationofthericemill,andtheprocessingconditions.Thisvariabilitycanmakeitdifficulttoachieveconsistentandpredictableperformanceinconcrete.

Anotherchallengeistheavailabilityandcostofricehuskash.Insomeregions,suchasSoutheastAsia,wherericeisastaplecrop,theremaybealargesupplyofricehuskashavailableatlowcost.However,inotherregions,thesupplymaybelimitedorthecostmaybehigherduetotransportationandprocessingcosts.

Overall,theuseofricehuskashinconcreteandsoilstabilizationshowsgreatpotentialforimprovingperformanceandsustainability.Furtherresearchisneededtobetterunderstandtheoptimalconditionsandmixdesignsforincorporatingricehuskash,aswellastoaddresschallengesrelatedtoqualitycontrolandavailabilityOnepotentiallimitationintheuseofricehuskashinconcreteisthepotentialforvariabilityinqualityandcomposition.Ricehuskashcanvaryinitschemicalandphysicalpropertiesbasedonfactorssuchasthevarietyofrice,processingmethod,andcombustionconditions.Thisvariabilitycanimpacttheperformanceoftheresultingconcrete,andmayrequiregreaterattentiontoqualitycontrolmeasures.

Anotherchallengeintheuseofricehuskashisitsavailabilityincertainregions.Whilericehuskashisabyproductofriceproductionandiswidelyavailableinmanycountries,theremaybeareaswherethesupplyislimitedorthecostisprohibitivelyhighduetotransportationandprocessingcosts.Insuchcases,alternativesourcesofsupplementarycementitiousmaterialsorsoilstabilizersmayneedtobeconsidered.

However,despitethesechallenges,thebenefitsofincorporatingricehuskashinconcreteandsoilstabilizationareclear.Byutilizingawasteproducttoimprovetheperformanceandsustainability