IHydroxypropyl methylcellulose ether kwiipropati zodaka lothuthu lwempukane

Isiphumo se-hydroxypropyl methylcellulose ether kwiipropati zodaka lothuthu lwempukane lwaphononongwa, kwaye ubudlelwane phakathi kobuninzi obumanzi kunye namandla oxinzelelo lwahlalutywa. Iziphumo zovavanyo zibonisa ukuba ukongeza i-hydroxypropyl methylcellulose ether ukubhabha udaka lwe-ash kunokuphucula kakhulu ukugcinwa kwamanzi omdaka, ukwandisa ixesha lokubopha udaka, kunye nokunciphisa ukuxinana okumanzi kunye namandla oxinzelelo lodaka. Kukho ulungelelwaniso oluhle phakathi koxinzelelo olumanzi kunye namandla oxinzelelo angama-28d. Ngaphantsi kwemeko yoxinaniso olumanzi olwaziwayo, amandla oxinzelelo angama-28d angabalwa ngokusebenzisa ifomula efanelekileyo.

Amagama angundoqo:bhabha uthuthu; i-cellulose ether; ukugcinwa kwamanzi; amandla oxinzelelo; unxulumano

Okwangoku, uthuthu lwempukane lusetyenziswa kakhulu kubunjineli bokwakha. Ukongeza inani elithile le-fly ash kwi-mortar ayikwazi nje ukuphucula iimpawu zoomatshini kunye nokuqina kodaka, kodwa nokunciphisa iindleko zodaka. Nangona kunjalo, i-fly ash mortar ibonisa ukugcinwa kwamanzi okwaneleyo, ngoko ke indlela yokuphucula ukugcinwa kwamanzi kwidaka ibe yingxaki engxamisekileyo ukuba isonjululwe. I-Cellulose ether yingxubevange yobuchule obuphezulu obusetyenziswa ngokuqhelekileyo ekhaya nakwamanye amazwe. Kufuneka nje ukuba yongezwe kwixabiso elincinci ukuba libe nempembelelo enkulu kwiimpawu zokusebenza ezifana nokugcinwa kwamanzi kunye namandla oxinzelelo lodaka.

1. Imathiriyeli ekrwada kunye neendlela zokuvavanya

1.1 Iimathiriyeli ekrwada

Isamente yiP·O 42.5 ibakala lesamente eqhelekileyo Portland eveliswe yi Hangzhou Meiya Cement Factory; uthuthu lwempukane lukwibakalaⅡuthuthu Isanti yisanti eqhelekileyo ephakathi kunye nemodyuli yokulunga eyi-2.3, ukuxinana kwe-1499kg·m-3, kunye nomxholo wokufuma we-0.14%, umthamo wodaka 0.72%; i-hydroxypropyl methyl cellulose ether (HPMC) iveliswa nguShandong Heda Co., Ltd., uphawu luyi-75HD100000; amanzi axutywayo ngamanzi epompo.

1.2 Ukulungiswa kodaka

Xa ukuxuba i-cellulose etere udaka olulungisiweyo, xuba kuqala i-HPMC kunye nesamente kwaye ubhabhe uthuthu ngokucokisekileyo, uze udibanise owomileyo nesanti imizuzwana engama-30, uze udibanise amanzi kwaye udibanise imizuzwana engekho ngaphantsi kwe-180.

1.3 Indlela yokuvavanya

Ukungaguquguquki, ukuxinana okumanzi, ukuchithwa kunye nexesha lokumisela udaka olusandula ukuxutywa luya kulinganiswa ngokwemigaqo efanelekileyo kwi-JGJ70-90 “Iindlela zoVavanyo lokuSebenza oluSisiseko lodaka lokwakha”. Ukugcinwa kwamanzi omdaka kunqunywe ngokwendlela yokuvavanya ukugcinwa kwamanzi omdaka kwiSihlomelo A seJG / T 230-2007 "I-Ready Mixed Mortar". Uvavanyo lwamandla olucinezelayo luthatha i-70.7mm x 70.7mm x 70.7mm ityhubhu esezantsi yovavanyo lokungunda. Ibhloko yovavanyo eyenziweyo iphiliswa kwiqondo lobushushu (20±2)°C kwiiyure ezingama-24, kwaye emva kokudilizwa, iyaqhubeka iphiliswa kwindawo enobushushu obungama-20.±2)°C kunye nomswakama ohambelanayo ngaphezu kwe-90% ukuya kwiminyaka emiselweyo, ngokutsho kwe-JGJ70-90 "Ukwakha i-Mortar Basic indlela yokuvavanya ukusebenza" ukumiselwa kwamandla ayo oxinzelelo.

2. Iziphumo zovavanyo kunye nohlalutyo

2.1 Ukuxinana okumanzi

Inokubonwa kubudlelwane phakathi koxinano kunye nobungakanani be-HPMC ukuba ingxinano emanzi iyancipha ngokuthe ngcembe ngokunyuka komthamo we-HPMC. Xa isixa se-HPMC yi-0.05%, ukuxinana okumanzi kodaka yi-96.8% ye-benchmark mortar. Xa isixa se-HPMC siqhubeka sikhula, Isantya esisezantsi soxinaniso olumanzi siyakhawuleza. Xa umxholo we-HPMC uyi-0.20%, ubuninzi be-mot density yi-81.5% kuphela ye-benchmark mortar. Oku kungenxa yempembelelo yokungenisa umoya ye-HPMC. Amaqamza omoya angenisiweyo anyusa ubunzulu bodaka kwaye anciphisa ukubumbana, okukhokelela ekuncipheni kobuninzi bomthamo wodaka.

2.2 Ukumisela ixesha

Inokubonwa kubudlelwane phakathi kwexesha le-coagulation kunye nesixa se-HPMC ukuba ixesha lokudibanisa likhula ngokuthe ngcembe. Xa i-dosage yi-0.20%, ixesha lokumisela landa ngo-29.8% xa kuthelekiswa nodaka lwereferensi, ukufikelela malunga ne-300min. Ingabonwa ukuba xa idosi yi-0.20%, ixesha lokumisela linotshintsho olukhulu. Isizathu kukuba uL Schmitz et al. bakholelwa ukuba iimolekyuli ze-cellulose ether zibhengezwa ikakhulu kwiimveliso ze-hydration ezifana ne-cSH kunye ne-calcium hydroxide, kwaye azifane zibhengezwe kwinqanaba lokuqala leminerali ye-clinker. Ukongezelela, ngenxa yokunyuka kwe-viscosity yesisombululo se-pore, i-cellulose ether iyancipha. Ukuhamba kwee-ion (Ca2 +, so42-...) kwisisombululo se-pore kulibazisa ngakumbi inkqubo yokufakwa kwamanzi.

2.3 Ukwaleka kunye nokugcinwa kwamanzi

Zombini iqondo le-delamination kunye nogcino lwamanzi lunokuphawula umphumo wogcino lwamanzi lodaka. Ukusuka kubudlelwane phakathi kwedigri ye-delamination kunye nesixa se-HPMC, kunokubonwa ukuba inqanaba le-delamination libonisa indlela ehlayo njengoko isixa se-HPMC sinyuka. Xa umxholo we-HPMC ngu-0.05%, iqondo le-delamination liyancipha kakhulu, libonisa ukuba xa umxholo we-fiber ether encinci, iqondo le-delamination lingancitshiswa kakhulu, umphumo wokugcinwa kwamanzi unokuphuculwa, kunye nokusebenza kunye ukusebenza kodaka kunokuphuculwa. Ukujonga kubudlelwane phakathi kwepropathi yamanzi kunye nesixa se-HPMC, njengoko isixa se-HPMC sinyuka, ugcino lwamanzi nalo lubangcono kancinci kancinci. Xa umthamo ungaphantsi kwe-0.15%, umphumo wokugcinwa kwamanzi ukhula ngokukhawuleza, kodwa xa i-dosage ifikelela kwi-0.20%, umphumo wokugcinwa kwamanzi uphuculwe kakhulu, ukusuka kwi-90.1% xa i-dosage yi-0.15%, ukuya kwi-95%. Isixa se-HPMC siyaqhubeka nokunyuka, kwaye ukusebenza kokwakhiwa kodaka kuqala ukuwohloka. Ngoko ke, ngokuqwalasela ukusebenza kokugcinwa kwamanzi kunye nokusebenza kokwakhiwa, isixa esifanelekileyo se-HPMC yi-0.10% ~ 0.20%. Uhlalutyo lwendlela yokugcina amanzi: I-cellulose ether yipolymer enyibilikayo yamanzi, eyahlulahlulwe ibe yi-ionic kunye ne-non-ionic. I-HPMC yi-ether ye-cellulose engekho i-ionic kunye neqela le-hydrophilic, iqela le-hydroxyl (-OH) kunye ne-ether bond (-0-1) kwifomula yayo yesakhiwo. Xa inyibilika emanzini, ii-athomu ze-oksijini kwiqela le-hydroxyl kunye ne-ether bond kunye namanzi Iimolekyuli zidibanisa ukwenza iibhondi ze-hydrogen, okwenza amanzi alahlekelwe yi-fluidity, kwaye amanzi akhululekile awasekho mahhala, ngaloo ndlela afezekise umphumo wokugcinwa kwamanzi kunye nokuqina.

2.4 Amandla acinezelayo

Ukususela kubudlelwane phakathi kwamandla oxinzelelo kunye nomthamo we-HPMC, kunokubonwa ukuba ngokunyuka kwenani le-HPMC, amandla oxinzelelo lwe-7d kunye ne-28d abonise ukuhla kokunciphisa, okwakubangelwa ubukhulu becala ukuqaliswa kwenani elikhulu. yamaqamza omoya yi-HPMC, eyandisa kakhulu i-porosity yodaka. ukwanda, okubangela ukuhla kwamandla. Xa umxholo u-0.05%, amandla oxinzelelo lwe-7d ahla kakhulu, amandla ahla nge-21.0%, kwaye amandla oxinzelelo lwe-28d ahla nge-26.6%. Inokubonwa kwigophe ukuba impembelelo ye-HPMC kumandla oxinzelelo ibonakala kakhulu. Xa idosi incinci kakhulu, iya kuncitshiswa kakhulu. Ngoko ke, kwizicelo eziphathekayo, umthamo wayo kufuneka ulawulwe kwaye usetyenziswe ngokudibanisa ne-defoamer. Ukuphanda isizathu, uGuan Xuemao et al. kholelwa ukuba okokuqala, xa i-cellulose ether yongezwa kwi-mortar, i-polymer eguquguqukayo kwi-pores yodaka iyanda, kwaye ezi polymers eziguquguqukayo kunye ne-pores azikwazi ukubonelela ngenkxaso eqinile xa ibhloko yovavanyo ixinzelelwe. I-matrix edibeneyo iyancipha, ngaloo ndlela inciphisa amandla oxinzelelo lodaka; okwesibini, ngenxa yesiphumo sokugcinwa kwamanzi se-cellulose ether, emva kokuba ibhloko yovavanyo lodaka lwenziwe, uninzi lwamanzi luhlala eludaka, kwaye umlinganiselo wesamente wamanzi ungaphantsi kunoko ngaphandle Kwabo bukhulu kakhulu, ngoko ke amandla oxinzelelo. yodaka iya kuncitshiswa kakhulu.

2.5 Unxulumano phakathi kwamandla oxinzelelo kunye nokuxinana okumanzi

Inokubonwa kwigophe lobudlelwane phakathi kwamandla oxinzelelo kunye nokuxinana okumanzi ukuba emva kokulungelelaniswa komgca kuwo onke amanqaku emfanekisweni, amanqaku ahambelanayo asasazwa kakuhle kumacala omabini omgca ofanelekileyo, kwaye kukho ulungelelwaniso oluhle phakathi koxinzelelo olumanzi kunye noxinzelelo. iipropathi zamandla, kunye noxinano olumanzi lulula kwaye kulula ukululinganisa, ngoko ke amandla acinezelayo odaka 28d anokubalwa nge-equation emiselweyo yomgca wokulinganisa. I-linear fitting equation iboniswe kwifomula (1), R²=0.9704. Y = 0.0195X-27.3 (1), apho, y amandla oxinzelelo angama-28d odaka, iMPa; I-X yingxinano emanzi, kg m-3.

3. Isiphelo

I-HPMC inokuphucula ukugcinwa kwamanzi kwisiphumo sodaka lwempukane kunye nokwandisa ixesha lokusebenza lodaka. Ngexesha elifanayo, ngenxa yokunyuka kwe-porosity yodaka, ubuninzi bayo kunye namandla oxinzelelo luya kuhla kakhulu, ngoko ke idosi efanelekileyo kufuneka ikhethwe kwisicelo. Amandla oxinzelelo lwe-28d omdaka anokulungelelaniswa okuhle kunye noxinzelelo olumanzi, kwaye amandla oxinzelelo angama-28d angabalwa ngokulinganisa ubuninzi obumanzi, obunexabiso elibalulekileyo lokubhekisela kulawulo lomgangatho wodaka ngexesha lokwakha.