Impembelelo ye-cellulose ether kwi-plastic free shrinkage of mortar

Impembelelo ye-cellulose ether kwi-plastic free shrinkage of mortar

I-sensor ye-laser displacement engaqhagamshelani nayo yayisetyenziselwa ukuvavanya ngokuqhubekayo i-plastic shrinkage yamahhala ye-HPMC eguqulelwe udaka lwesamente phantsi kweemeko ezikhawulezayo, kwaye izinga layo lokulahlekelwa kwamanzi labonwa ngaxeshanye. Umxholo we-HPMC kunye neemodeli zeplastiki zokucutheka simahla kunye nenqanaba lokuthotywa kwamanzi zisekiwe ngokulandelelanayo. Iziphumo zibonisa ukuba i-plastic free shrinkage ye-cement mortar iyancipha ngokuthe ngqo ngokunyuka komxholo we-HPMC, kwaye i-plastic shrinkage yamahhala ye-cement mortar ingancitshiswa nge-30% -50% kunye nokongezwa kwe-0.1% -0.4% (iqhekeza elikhulu) HPMC. Ngokunyuka komxholo we-HPMC, izinga lelahleko yamanzi yodaka lwesamente nalo liyehla ngokomgca. Izinga lelahleko yamanzi yodaka lwesamente lingancitshiswa nge-9% ~ 29% ngokongezwa kwe-0.1% ~ 0.4% HPMC. Umxholo we-HPMC unobudlelwane obucacileyo bomgca kunye nokuncipha kwasimahla kunye nenqanaba lokulahleka kwamanzi lodaka. I-HPMC inciphisa ukushwabana kweplastiki yodaka lwesamente ngenxa yokugcinwa kwayo kakuhle kwamanzi.

Amagama angundoqo:imethyl hydroxypropyl cellulose ether (HPMC); Udaka; Iplastiki iyancipha ngokukhululeka; izinga lokulahleka kwamanzi; Imodeli yokubuyisela umva

Xa kuthelekiswa nekonkile yesamente, udaka lwesamente luqhekeka lula. Ukongeza kwimiba yezinto eziluhlaza ngokwazo, utshintsho lobushushu bangaphandle kunye nokufuma kuya kwenza udaka lwesamente lukhawuleze ukulahleka kwamanzi, okukhokelela ekuqhekekeni okukhawulezileyo. Ukusombulula ingxaki yokuqhekeka kodaka lwesamente, ngokuqhelekileyo ixazululwa ngokuqinisa ukunyanga kwangaphambili, usebenzisa i-ejenti yokwandisa kunye nokongeza i-fiber.

Njengomxube wepolymer oqhele ukusetyenziswa kudaka lwesamente yorhwebo, i-cellulose ether iphuma kwi-cellulose efunyenwe ngokusabela kwesityalo se-cellulose kunye ne-caustic soda. UZhan Zhenfeng et al. ibonise ukuba xa umxholo we-cellulose ether (iqhezu lobunzima) wawuyi-0% ~ 0.4%, izinga lokugcinwa kwamanzi kwi-samente yodaka linobudlelwane obuhle bomgca kunye nomxholo we-cellulose ether, kwaye okukhona umxholo we-cellulose ether, mkhulu izinga lokugcinwa kwamanzi. I-Methyl hydroxypropyl cellulose ether (HPMC) isetyenziselwa udaka lwesamente ukuphucula ukuhambelana kwayo kunye nokubambisana ngenxa yokubambisana kwayo, ukuzinza kunye nokugcinwa kwamanzi.

Eli phepha lithatha iplastiki shrinkage free yodaka lwesamente njengento yovavanyo, iphonononge isiphumo HPMC kwi iplastiki shrinkage free yodaka lwesamente, kwaye uhlalutya isizathu sokuba HPMC kunciphisa iplastiki shrinkage free yodaka lwesamente.

1. Imathiriyeli ekrwada kunye neendlela zokuvavanya

1.1 IiMathiriyeli ezikrwada

I-samente esetyenziswe kuvavanyo yayiyi-conch brand 42.5R yesamente eqhelekileyo yasePortland eveliswe ngu-Anhui Conch Cement Co., LTD. Indawo yayo ethile yayiyi-398.1 m² / kg, intsalela ye-sieve ye-80μm yayiyi-0.2% (iqhezu lobunzima); HPMC ibonelelwa yi Shanghai Shangnan Trading Co., LTD. I-viscosity yayo yi-40 000 mPa · s, isanti yisanti erhabaxa ephakathi erhabaxa, imodyuli yefineness yi-2.59, kwaye ubukhulu besuntswana ubukhulu yi-5mm.

1.2 Iindlela zovavanyo

1.2.1 Indlela yokuvavanya ukushwabana kwePlastiki yasimahla

I-plastic free shrinkage yodaka lwesamente yavavanywa ngesixhobo sokulinga esichazwe kwiincwadi. Umlinganiselo wesamente kwisanti ye-benchmark mortar yi-1: 2 (i-mass ratio), kunye nomlinganiselo wamanzi kwi-samente ngu-0.5 (umlinganiselo wobunzima). Ukulinganisa izinto eziluhlaza ngokwe-mix ratio, kwaye ngelo xesha ungeze kwi-pot yokuxuba eyomileyo evuselela i-1min, uze ungeze amanzi kwaye uqhubeke uvuselela i-2min. Yongeza malunga ne-20g ye-settler (iswekile emhlophe ehlanjululweyo), xuba kakuhle, ugalele udaka lwesamente ngaphandle ukusuka embindini wenkuni yokubumba ngendlela ejikelezayo, yenze ukuba igqume i-mold yomthi ephantsi, igudise nge-spatula, kwaye usebenzise ukulahla. ifilimu yeplastiki ukuyisasaza phezu kodaka lwesamente, uze ugalele udaka lovavanyo kwilaphu letafile yeplastiki ngendlela efanayo yokuzalisa umngundo womthi ophezulu. Kwaye ngoko nangoko kunye nobude bepleyiti yealuminiyam emanzi ubude kunobubanzi bomngundo womthi, khawuleza ukhuhle ecaleni elide lokungunda komthi.

I-Microtrak II LTC-025-04 inzwa yokufuduka kwe-laser yayisetyenziselwa ukulinganisa i-plastic shrinkage yamahhala ye-sement mortar slab. La manyathelo alandelayo: Iithagethi ezimbini zovavanyo (iipleyiti zogwebu ezincinci) zabekwa kwindawo ephakathi kwipleyiti yodaka lwesamente egalelweyo, kwaye umgama phakathi kweethagethi ezimbini zovavanyo ubuyi-300mm. Emva koko, isakhelo sentsimbi esilungiswe nge-laser displacement sensor sibekwe ngaphezu kwe-specimen, kwaye ukufundwa kokuqala phakathi kwe-laser kunye nento elinganisiweyo kwahlengahlengiswa ukuba ibe ngaphakathi kwinqanaba le-0. Ekugqibeleni, isibane se-iodine ye-tungsten ye-1000W malunga ne-1.0m ngaphezu kwe-wood mold kunye ne-fan yombane malunga ne-0.75m ngaphezu kwe-wood mold (isantya somoya yi-5m / s) yavulwa ngaxeshanye. Uvavanyo lweplastiki lwasimahla lokucutheka lwaqhubeka de umfuziselo wacutheka wazinza. Ngexesha lovavanyo lonke, iqondo lobushushu laliyi (20±3)℃ kunye nokufuma okunxulumeneyo kwaba (60±5)%.

1.2.2 Indlela yovavanyo lomlinganiselo wokuphuphuma kwamanzi

Ukuqwalasela impembelelo yokubunjwa kwezixhobo ezisekelwe kwisamente kumlinganiselo wokuphuphuma kwamanzi, uncwadi lusebenzisa iisampulu ezincinci ukulinganisa isantya somphunga wamanzi kwiisampulu ezinkulu, kunye nobudlelwane phakathi komlinganiselo Y wezinga lokuphuphuma kwamanzi kwiplate enkulu yesamente yodaka. kunye nodaka lwesamente yepleyiti encinci kunye nexesha t(h) ngolu hlobo lulandelayo: y= 0.0002 t+0.736

2. Iziphumo kunye nengxoxo

2.1 Impembelelo yesiqulatho se-HPMC kwi-plastic free shrinkage yodaka lwesamente

Ukususela kwisiphumo somxholo we-HPMC kwi-plastic shrinkage free shrinkage yodaka lwesamente, kunokubonwa ukuba i-plastic shrinkage shrinkage yodaka lwesamente oluqhelekileyo lwenzeka ngokukodwa phakathi kwe-4h yokuqhekeka okukhawulezileyo, kunye nokunciphisa i-plastic free shrinkage yayo inyuka ngokulandelelana kunye nokwandiswa kwexesha. Emva kwe-4h, i-plastic shrinkage yamahhala ifikelela kwi-3.48mm, kwaye ijika liba lizinzile. Iigophe zeplastiki zasimahla zodaka lwesamente ye-HPMC zonke zibekwe ngaphantsi kweegophe zeplastiki zokushwabana zasimahla zodaka oluqhelekileyo lwesamente, nto leyo ebonisa ukuba igophe leplastiki lasimahla lokushwabana lodaka lwesamente lweHPMC luncinci kunodaka lwesamente oluqhelekileyo. Ngokunyuka komxholo we-HPMC, i-plastic free shrinkage yodaka lwesamente iyancipha ngokuthe ngcembe. Xa kuthelekiswa nodaka lwesamente oluqhelekileyo, ukushwabana kweplastiki okusimahla kodaka lwesamente lweHPMC oluxutywe ne-0.1% ~ 0.2% (iqhezu lobunzima) kuncipha malunga ne-30%, malunga ne-2.45mm, kunye nokushwabana kweplastiki okusimahla kwe-0.3% yodaka lwesamente yeHPMC kuncipha malunga nama-40. %. Imalunga ne-2.10mm, kwaye i-plastic free shrinkage ye-0.4% yodaka lwesamente ye-HPMC iyancipha malunga ne-50%, malunga ne-1.82mm. Ngoko ke, ngexesha elifanayo elikhawulezayo lokuqhekeka, i-plastic shrinkage yamahhala ye-HPMC yodaka lwesamente iphantsi kunodaka oluqhelekileyo lwesamente, ebonisa ukuba ukufakwa kwe-HPMC kunokunciphisa i-plastic free shrinkage yodaka lwesamente.

Ukususela kwisiphumo somxholo we-HPMC kwi-plastic free shrinkage yodaka lwesamente, kunokubonwa ukuba ngokunyuka komxholo we-HPMC, i-plastic shrinkage yamahhala yodaka lwesamente iyancipha ngokuthe ngcembe. Ubudlelwane phakathi kweplastiki yasimahla yokucutheka (s) yodaka lwesamente kunye nomxholo weHPMC (w) unokufakwa ngale fomula ilandelayo: S= 2.77-2.66 w

Umxholo we-HPMC kunye ne-cement mortar yeplastiki yeplastiki yasimahla yokuncipha komgca weziphumo zohlalutya lolwahlukano, apho: F yi-statistic; Sig. Imele elona nqanaba lokubaluleka.

Iziphumo zibonisa ukuba i-coefficient yokulungelelanisa yale nxaki yi-0.93.

2.2 Impembelelo yesiqulatho se-HPMC kumlinganiselo wokulahleka kwamanzi odaka lwesamente

Ngaphantsi kwemeko yokukhawulezisa, inokubonwa ukusuka kutshintsho lwenqanaba lokulahleka kwamanzi odaka lwesamente kunye nomxholo we-HPMC, inqanaba lelahleko yamanzi yodaka lwesamente lomphezulu liyancipha ngokuthe ngcembe ngokunyuka komxholo we-HPMC, kwaye ngokusisiseko libonisa ukuhla komgca. Xa kuthelekiswa nenqanaba lokulahlekelwa kwamanzi odaka lwesamente oluqhelekileyo, xa umxholo we-HPMC ngu-0.1%, 0.2%, 0.3%, 0.4%, ngokulandelanayo, Umlinganiselo welahleko yamanzi we-slab enkulu yodaka lwesamente yehla ngo-9.0%, 12.7%, 22.3% kunye 29.4%, ngokulandelanayo. Ukufakwa kwe-HPMC kunciphisa izinga lokulahlekelwa kwamanzi kwi-samente yodaka kwaye kwenza amanzi amaninzi athathe inxaxheba kwi-hydration yodaka lwesamente, ngaloo ndlela enze amandla aneleyo okumelana nomngcipheko wokuqhekeka oziswa yimeko yangaphandle.

Ubudlelwane phakathi kweqondo lokulahleka kwamanzi kudaka lwesamente (d) kunye nomxholo we-HPMC (w) unokufakwa ngale fomula ilandelayo: d= 0.17-0.1w

Iziphumo zokuhlalutya ukuchasana kwe-linear regression analysis ye-HPMC kunye ne-cement mortar water loss rate zibonisa ukuba i-coefficient yokulungelelaniswa kwe-0.91, kwaye ukulungelelaniswa kubonakala.

3. Isiphelo

Iplastiki yokucutheka yasimahla yodaka lwesamente iyancipha kancinci kancinci ngokunyuka komxholo weHPMC. Iplastiki yokucutheka simahla kodaka lwesamente nge-0.1% ~ 0.4% HPMC yehla ngama-30% ~ 50%. Izinga lelahleko yamanzi yodaka lwesamente liyehla ngokunyuka komxholo we-HPMC. Izinga lelahleko yamanzi yodaka lwesamente nge-0.1% ~ 0.4% HPMC yehla nge-9.0% ~ 29.4%. Ukuncipha kweplastiki simahla kunye nenqanaba lokulahleka kwamanzi kudaka lwesamente luhambelana nomxholo we-HPMC.