I-ether yeCellulose kudaka lokuzilinganisa

Iziphumo zeihydroxypropyl methyl cellulose etherkwi-fluidity, ukugcinwa kwamanzi kunye namandla okubopha udaka lokuzilinganisa lwaphononongwa. Iziphumo zibonisa ukuba i-HPMC inokuphucula ngokufanelekileyo ukugcinwa kwamanzi kwi-self-leveling mortar kunye nokunciphisa ukuhambelana kodaka. Ukuqaliswa kwe-HPMC kunokuphucula amandla okubopha udaka, kodwa amandla oxinzelelo, amandla okuguquguquka kunye nokuncipha kwamanzi. Uvavanyo lokuchasana kwe-SEM lwenziwa kwiisampuli, kwaye umphumo we-HPMC kwimpembelelo yokunciphisa, ukugcinwa kwamanzi kunye namandla omdaka kwachazwa ngakumbi kwikhosi ye-hydration ye-samente kwi-3 kunye neentsuku ze-28.

Amagama angundoqo:udaka lokuzilinganisa; Iselulosi ether; Ubumanzi; Ukugcinwa kwamanzi

0. Intshayelelo

Udaka oluzilinganisa ngokwalo lunokuxhomekeka kubunzima balo ukwenza isiseko esisicaba, esigudileyo kwaye esomeleleyo kwi-substrate, ukuze ubeke okanye ubophe ezinye izinto, kwaye unokwenza indawo enkulu yolwakhiwo olusebenzayo, ke ngoko, umbane ophezulu uphawu olubaluleke kakhulu lodaka lokuzilinganisa; Ngokukodwa njengomthamo omkhulu, i-dense eyomeleziweyo okanye i-gap engaphantsi kwe-10 mm yokubuyisela umva okanye ukuqinisa ukusetyenziswa kwezinto zokugaya. Ukongeza kwi-fluidity enhle, i-self-leveling mortar kufuneka ibe nokugcinwa kwamanzi athile kunye namandla ebhondi, akukho nto yokwahlukaniswa kwegazi, kwaye ibe neempawu ze-adiabatic kunye nokunyuka kweqondo lokushisa eliphantsi.

Ngokubanzi, udaka oluzilinganisa ngokwalo lufuna ulwelo olulungileyo, kodwa olona daka lwesamente ludla ngokuba yi-10 ~ 12 cm kuphela. I-self-leveling mortar ingaba yi-self-compacting, kwaye ixesha lokuqala lokumisela lide kwaye ixesha lokugqibela lokumisela lifutshane. I-ether ye-cellulose yenye yezongezo eziphambili zodaka oluxutyiweyo, nangona isixa sokongeza siphantsi kakhulu, kodwa sinokuphucula kakhulu ukusebenza kodaka, kunokuphucula ukuhambelana kodaka, ukusebenza kokusebenza, ukusebenza kwebhondi kunye nokusebenza kokugcinwa kwamanzi, indima ebaluleke kakhulu kwintsimi yodaka olulungeleyo.

1. Imathiriyeli ekrwada kunye neendlela zophando

1.1 IiMathiriyeli ezikrwada

(1) I-P · O ye-42.5 yodidi lwesamente eqhelekileyo.

2

(3) I-cellulose ether: i-hydroxypropyl methyl cellulose ether yimveliso ye-hydroxyl ithathelwe indawo yi-methoxy kunye ne-hydroxypropyl, ngokulandelanayo, kunye ne-viscosity ye-300mpa·s. Okwangoku, uninzi lwe-cellulose ether esetyenziswayo yi-hydroxypropyl methyl cellulose ether kunye ne-hydroxyethyl methyl cellulose ether.

(4) i-superplasticizer: i-polycarboxylic acid superplasticizer.

(5) I-latex powder ephindwe kwakhona: I-HW5115 ichungechunge eveliswe nguHenan Tiansheng Chemical Co., Ltd. i-latex powder edibeneyo edibeneyo i-copolymerized yi-VAC / VeoVa.

1.2 Iindlela zovavanyo

Uvavanyo lwenziwe ngokuhambelana nomgangatho woshishino lwe-JC / T 985-2005 "I-Cement-based Self-leveling Mortar for Use Ground". Ixesha lokumisela linqunywe ngokubhekiselele kwi-standard consistency kunye nexesha lokubeka i-JC / T 727 ye-cement paste. I-self-leveling mortar specimen yokwenza, ukugoba kunye novavanyo lwamandla oxinzelelo lubhekisela kwi-GB / T 17671. Indlela yokuvavanya amandla ebhondi: I-80mmx80mmx20mm ibhloko yovavanyo lodaka ilungiselelwe kwangaphambili, kwaye iminyaka yayo ingaphezulu kwe-28d. Umphezulu wenziwe rhabaxa, kwaye amanzi agcweleyo phezu komhlaba acinywa emva kokumanzisa kwe-10min. Iqhekeza lovavanyo lodaka ligalelwa kwindawo epholisiweyo kunye nobukhulu be-40mmx40mmx10mm. Amandla ebhondi avavanywa kwiminyaka yoyilo.

Ukuskena i-electron microscopy (SEM) yasetyenziselwa ukuhlalutya i-morphology yezinto eziqiniweyo kwi-slurry. Kwisifundo, indlela yokuxuba zonke izinto zomgubo: okokuqala, izixhobo zepowder zecandelo ngalinye zixutywe ngokulinganayo, kwaye zongezwa kumanzi acetywayo ukuxuba okufanayo. Umphumo we-cellulose ether kwi-self-leveling mortar yahlalutywa ngamandla, ukugcinwa kwamanzi, i-fluidity kunye neemvavanyo ze-SEM microscopic.

2. Iziphumo kunye nohlalutyo

2.1 Ukushukuma

I-ether yeCellulose inefuthe elibalulekileyo ekugcineni amanzi, ukungaguquguquki kunye nokusebenza kolwakhiwo lwe-self leveling mortar. Ngokukodwa njengodaka lokuzilinganisa, ulwelo lusesinye sezalathisi eziphambili zokuvavanya ukusebenza kodaka lokuzilinganisa. Kwisiseko sokuqinisekisa ukubunjwa okuqhelekileyo kodaka, ukuchithwa kodaka kunokulungiswa ngokuguqula umxholo we-cellulose ether.

Ngokunyuka komxholo we-cellulose ether. Ukumanzi kodaka kuncipha ngokuthe ngcembe. Xa idosi yi-0.06%, i-fluidity ye-mortar iyancipha ngaphezu kwe-8%, kwaye xa i-dosage yi-0.08%, i-fluidity iyancipha ngaphezu kwe-13.5%. Kwangaxeshanye, kunye nokwandiswa kweminyaka, idosi ephezulu ibonisa ukuba isixa se-cellulose ether kufuneka ilawulwe phakathi koluhlu oluthile, idosi ephezulu kakhulu iya kuzisa iziphumo ezibi kwi-mortar fluidity. Amanzi kunye nesamente eludaka zenza i-slurry ecocekileyo yokuvala isithuba sesanti, kwaye ijikeleze isanti ukuze idlale indima yokuthambisa, ukuze udaka lube nolwelo oluthile. Ngokungeniswa kwe-cellulose ether, umxholo wamanzi asimahla kwinkqubo iyancipha, kwaye umaleko wokugquma eludongeni lwangaphandle lwesanti uyancitshiswa, ngaloo ndlela unciphisa ukuhamba komdaka. Ngenxa yemfuno yodaka oluzilinganisayo olunolwelo oluphezulu, isixa se-cellulose ether kufuneka ilawulwe kuluhlu olufanelekileyo.

2.2 Ugcino lwamanzi

Ukugcinwa kwamanzi odaka sisalathiso esibalulekileyo sokulinganisa ukuzinza kwamacandelo kudaka lwesamente esandula kuxutywa. Ukongeza isixa esifanelekileyo se-cellulose ether kunokuphucula ukugcinwa kwamanzi kwidaka. Ukuze wenze ukuphendulwa kwe-hydration yezinto ze-cementing ngokupheleleyo, umlinganiselo ofanelekileyo we-cellulose ether unokugcina amanzi kumdaka ixesha elide ukuqinisekisa ukuba ukuphendulwa kwe-hydration yezinto ze-cementing kunokwenziwa ngokupheleleyo.

I-ether ye-cellulose ingasetyenziselwa njenge-arhente yokugcina amanzi ngenxa yokuba ii-athomu ze-oksijini kwi-hydroxyl kunye neebhondi ze-ether zidibene neemolekyuli zamanzi ukwenza iibhondi ze-hydrogen, okwenza amanzi akhululekile abe ngamanzi adibeneyo. Inokubonwa kubudlelwane phakathi komxholo we-cellulose ether kunye nesantya sokugcinwa kwamanzi kwi-mortar ukuba izinga lokugcinwa kwamanzi kwi-mortar linyuka ngokunyuka komxholo we-cellulose ether. Isiphumo sokugcina amanzi se-cellulose ether sinokuthintela i-substrate ukuba ithathe amanzi amaninzi kwaye ikhawuleze kakhulu, kwaye ithintele ukukhuphuka kwamanzi, ngaloo ndlela iqinisekisa ukuba indawo ye-slurry ibonelela ngamanzi aneleyo kwi-cement hydration. Kukho nezifundo ezibonisa ukuba ukongeza kwisixa se-cellulose ether, i-viscosity yayo (ubunzima bemolekyuli) nayo inempembelelo enkulu ekugcinweni kwamanzi odaka, ubukhulu be-viscosity, ngcono ukugcinwa kwamanzi. I-Cellulose ether ene-viscosity ye-400 MPa·S isetyenziswa ngokubanzi kwi-self-leveling mortar, enokuphucula ukusebenza komgangatho wodaka kunye nokuphucula ukubumbana kodaka. Xa i-viscosity idlula i-40000 MPa·S, ukusebenza kokugcinwa kwamanzi akusaphuculwa kakhulu, kwaye ayifanelekanga kwi-self-leveling mortar.

Kule sifundo, iisampulu zodaka kunye ne-cellulose ether kunye nodaka ngaphandle kwe-cellulose ether zathathwa. Inxalenye yeesampuli yayiyi-3d yobudala, kwaye enye inxalenye ye-3d yeminyaka yobudala yayiyi-standard ye-28d, kwaye ke ukubunjwa kweemveliso ze-cement hydration kwiisampuli zavavanywa yi-SEM.

Iimveliso ze-hydration zesamente kwisampuli engenanto yesampuli yodaka kwi-3d yobudala zingaphezulu kwesampulu ene-cellulose ether, kwaye kwiminyaka eyi-28d, iimveliso ze-hydration kwisampuli kunye ne-cellulose ether zingaphezulu kakhulu kunezo zesampuli ezingenanto. I-hydration yokuqala yamanzi ilibazisekile ngenxa yokuba kukho ifilimu eyinkimbinkimbi eyenziwe yi-cellulose ether phezu kwamaqhekeza e-samente kwinqanaba lokuqala. Nangona kunjalo, kunye nokwandiswa kwexesha, inkqubo ye-hydration ihamba ngokukhawuleza. Ngeli xesha, ukugcinwa kwamanzi kwe-cellulose ether kwi-slurry kwenza kubekho amanzi aneleyo kwi-slurry ukuhlangabezana nemfuno ye-hydration reaction, ehambelana nenkqubela phambili epheleleyo ye-hydration reaction. Ke ngoko, kukho iimveliso ezininzi ze-hydration kwi-slurry kwinqanaba lamva. Xa sithetha ngokuthelekisa, kukho amanzi amaninzi asimahla kwisampulu engenanto, enokwanelisa amanzi afunekayo ngokusabela kwesamente kwangoko. Nangona kunjalo, ngenkqubela phambili yenkqubo ye-hydration, inxalenye yamanzi kwisampulu idliwe yi-hydration reaction yasekuqaleni, kwaye enye inxalenye ilahleka ngokunyuka kwe-evaporation, okubangela ukungonelanga kwamanzi kwi-slurry kamva. Ke ngoko, iimveliso ze-3d hydration kwisampulu engenanto zingaphezulu. Ubungakanani beemveliso ze-hydration zingaphantsi kakhulu kwixabiso lemveliso ye-hydration kwisampulu equlethe i-ether ye-cellulose. Ke ngoko, ngokwembono yeemveliso ze-hydration, kuphinda kucaciswe ukuba ukongeza isixa esifanelekileyo se-cellulose ether kumdaka kunokuphucula ukugcinwa kwamanzi eludaka.

2.3 Ukumisela ixesha

I-ether ye-cellulose inefuthe elithile lokunciphisa udaka, kunye nokunyuka kwe-cellulose ether content. Ixesha lokumisa udaka ke longezwa. Isiphumo sokunciphisa i-cellulose ether ihambelana ngokuthe ngqo neempawu zayo zesakhiwo. I-cellulose ether ine-dehydrated glucose ring structure, enokuthi yenze isango le-sugar calcium molecular complex kunye ne-calcium ions kwisisombululo se-samente hydration, ukunciphisa ukuxinwa kwe-calcium ion kwi-cement hydration induction period, ukuthintela ukubunjwa kunye nemvula yeCa (OH) 2 kunye netyuwa ye-calcium. iikristale, ukwenzela ukulibazisa inkqubo ye-hydration yesamente. Isiphumo esibambekayo se-cellulose ether kudaka lwesamente ikakhulu sixhomekeke kwiqondo lokutshintshwa kwe-alkyl kwaye inobudlelwane obuncinci kunye nobunzima bemolekyuli. Incinci idigri yokutshintsha kwe-alkyl, isikhulu isiqulatho se-hydroxyl, kokukhona sicaca ngakumbi isiphumo sokubuyiswa. L. Semitz et al. wayekholelwa ukuba iimolekyuli ze-cellulose ether zazithengiswa ikakhulu kwiimveliso ze-hydration ezifana ne-C - S - H kunye ne-Ca (OH) 2, kwaye kunqabile ukuba zifakwe kwi-clinker minerals original. Idityaniswe nohlalutyo lwe-SEM lwenkqubo ye-cement hydration, kufumaniseke ukuba i-cellulose ether inesiphumo esithile sokunciphisa, kwaye okukhona kumxholo we-cellulose ether, kubonakala ngakumbi impembelelo ebambekayo yongqimba lwefilimu entsonkothileyo kwi-hydration yokuqala yesamente, ngoko ke, icace ngakumbi isiphumo sokulibazisa.

2.4 Amandla e-Flexural kunye namandla oxinzelelo

Ngokubanzi, amandla yenye yezalathisi zovavanyo ezibalulekileyo zesamente esekwe kwimathiriyeli yesamente ephilisa isiphumo semixube. Ukongeza ekusebenzeni okuphezulu kokuhamba, i-self-leveling mortar kufuneka ibe namandla athile oxinzelelo kunye namandla okuguquguquka. Kolu phononongo, i-7 kunye neentsuku ze-28 zamandla oxinzelelo kunye nokuqina kwe-flexural yodaka olungenanto oluxutywe ne-cellulose ether yavavanywa.

Ngokunyuka komxholo we-cellulose ether, amandla oxinzelelo lwe-mortar kunye namandla e-flexural ayancipha kwi-amplitude eyahlukeneyo, umxholo uncinci, impembelelo kumandla ayibonakali, kodwa kumxholo ongaphezulu kwe-0.02%, ukukhula kwesantya sokulahlekelwa kwamandla kubonakala ngakumbi. , ngoko ke, ekusebenziseni i-cellulose ether ukuphucula ukugcinwa kwamanzi omdaka, kodwa kwakhona kuthathelwe ingqalelo utshintsho lwamandla.

Iimbangela zokunyanzeliswa kodaka kunye namandla aguquguqukayo ayancipha. Inokuhlalutywa kule miba ilandelayo. Okokuqala, amandla okuqala kunye nesamente yokuqina ngokukhawuleza ayizange isetyenziswe kwisifundo. Xa udaka olomileyo luxutywe namanzi, amanye amasuntswana omgubo we-cellulose ether yerubha aqala adsorbed kumphezulu wamasuntswana esamente ukwenza ifilimu yelatex, eyalibazisa ukuhanjiswa kwesamente kwaye yanciphisa amandla okuqala odaka lwematrix. Okwesibini, ukuze ukulinganisa indawo yokusebenza yokulungiselela udaka lokuzilinganisa kwisiza, yonke imizekelo kuphononongo ayizange ingene kwi-vibration kwinkqubo yokulungiselela kunye nokubumba, kwaye ixhomekeke ekuzilinganiseni kobunzima. Ngenxa yogcino lwamanzi oluqinileyo lwe-cellulose ether kumdaka, inani elikhulu leepores lashiywa kwi-matrix emva kokuqina kodaka. Ukonyuka kwe-porosity kudaka kukwasisizathu esibalulekileyo sokuhla kwamandla oxinzelelo kunye nokuguquguquka kodaka. Ukongezelela, emva kokufaka i-cellulose ether kwi-mortar, umxholo we-polymer flexible kwi-pores of mortar ukwanda. Xa i-matrix icinezelwe, i-polymer eguquguqukayo inzima ukudlala indima exhasayo eqinile, echaphazela nokusebenza kwamandla kwe-matrix kwinqanaba elithile.

2.5 Amandla okudibanisa

I-ether ye-cellulose inempembelelo enkulu kwipropati yokubambisana yodaka kwaye isetyenziswa ngokubanzi kuphando kunye nokulungiswa kodaka oluzimeleyo.

Xa umxholo we-cellulose ether uphakathi kwe-0.02% kunye ne-0.10%, amandla e-bond bond of mortar aphuculwe ngokucacileyo, kwaye amandla ebhondi kwiintsuku ze-28 ziphezulu kakhulu kunoko kwiintsuku ze-7. I-cellulose ether yenza ifilimu ye-polymer evaliweyo phakathi kweengqungquthela ze-cement hydration kunye nenkqubo yesigaba se-liquid, ekhuthaza amanzi amaninzi kwifilimu ye-polymer ngaphandle kwamaqhekeza e-cement, ehambelana ne-hydration epheleleyo ye-samente, ukwenzela ukuba kuphuculwe amandla ebhondi ye-paste. emva kokuqina. Kwangaxeshanye, isixa esifanelekileyo se-cellulose ether sonyusa iplastiki kunye nokuguquguquka kodaka, kunciphisa ukuqina kwendawo yenguqu phakathi kodaka kunye ne-substrate interface, kunciphisa uxinzelelo lokutyibilika phakathi kojongano, kwaye kwandisa isiphumo sokubopha phakathi kodaka kunye ne-substrate kwi-interface. iqondo elithile. Ngenxa yobukho be-cellulose ether kwi-sement slurry, indawo ekhethekileyo yokutshintshwa kwe-interfacial kunye ne-interfacial layer yenziwa phakathi kwamasuntswana omdaka kunye neemveliso ze-hydration. Lo maleko odibanisa ubuso wenza ukuba indawo yenguqu edibanisa ubuso ibe bhetyebhetye kwaye ingaqina kangako, ukuze udaka lube namandla okubopha olomeleleyo.

3. Isiphelo kunye neNgxoxo

I-ether ye-cellulose inokuphucula ukugcinwa kwamanzi kwi-self-leveling mortar. Ngokunyuka komthamo we-cellulose ether, ukugcinwa kwamanzi kwi-mortar kuphuculwe ngokuthe ngcembe, kwaye umbane we-mortar kunye nexesha lokubeka liyancitshiswa ukuya kwinqanaba elithile. Ukugcinwa kwamanzi aphezulu kakhulu kuya kwandisa i-porosity ye-slurry eqinile, enokwenza ukuba amandla oxinzelelo kunye nokuguquguquka kodaka oluqinileyo lube nelahleko ebonakalayo. Kuphononongo, amandla ancipha kakhulu xa idosi iphakathi kwe-0.02% kunye ne-0.04%, kwaye ngakumbi isixa se-cellulose ether, kokukhona kubonakala ngakumbi isiphumo sokubuyiswa. Ke ngoko, xa usebenzisa i-cellulose ether, kukwafuneka ukuba kuqwalaselwe ngokubanzi iipropathi zoomatshini bodaka oluzilinganisayo, ukhetho olufanelekileyo lwedosi kunye nefuthe le-synergistic phakathi kwayo kunye nezinye izinto zekhemikhali.

Ukusetyenziswa kwe-ether ye-cellulose kunokunciphisa amandla oxinzelelo kunye namandla okuguquguquka kwe-slurry ye-samente, kunye nokuphucula amandla okudibanisa udaka. Uhlalutyo lwezizathu zokutshintsha amandla, okubangelwa ikakhulu kukutshintsha kweemveliso ezincinci kunye nesakhiwo, kwelinye icala, i-cellulose ether irabha yomgubo amasuntswana adsorbed kuqala kumphezulu wamasuntswana esamente, ukubunjwa kwefilimu yelatex, ukulibazisa ukuhanjiswa kwamanzi. isamente, eya kubangela ukulahleka kwamandla okuqala odaka; Ngakolunye uhlangothi, ngenxa yempembelelo yokwenza ifilimu kunye nefuthe lokugcinwa kwamanzi, kukulungele ukuhanjiswa okupheleleyo kwe-samente kunye nokuphuculwa kwamandla ebhondi. Umbhali ukholelwa ukuba ezi ntlobo zimbini zotshintsho lwamandla lukhona ikakhulu kumda wexesha lokumisela, kwaye ukuqhubela phambili kunye nokulibaziseka kwalo mda kunokuba yinto ebalulekileyo ebangela ubukhulu beentlobo ezimbini zamandla. Uphononongo olunzulu kunye nolucwangcisiweyo lwale ngongoma ebalulekileyo luya kuba luncedo kulawulo olungcono kunye nohlalutyo lwenkqubo ye-hydration yezinto eziqiniweyo kwi-slurry. Kuyanceda ukulungelelanisa ubungakanani be-cellulose ether kunye nexesha lokunyanga ngokwemfuno yezakhiwo zodaka, ukwenzela ukuba kuphuculwe ukusebenza kodaka.