1. Ubushushu bokufuma
Ngokwendlela yokukhululwa kobushushu bokufuma ngokuhamba kwexesha, inkqubo yokufuma yesamente idla ngokwahlulwahlulwa ibe ngamanqanaba amahlanu, oko kukuthi, ixesha lokuqala lokufuma (0~15min), ixesha lokungenisa (15min~4h), ixesha lokukhawulezisa nokuseta (4h~8h), ixesha lokuthomalalisa nokuqina (8h~24h), kunye nexesha lokuphilisa (1d~28d).
Iziphumo zovavanyo zibonisa ukuba kwinqanaba lokuqala lokungeniswa (oko kukuthi, ixesha lokuqala lokufunxa amanzi), xa ubungakanani be-HEMC buyi-0.1% xa kuthelekiswa ne-slurry yesamente engenanto, incochoyi ye-exothermic ye-slurry iphucukile kwaye incochoyi iyanda kakhulu. Xa ubungakanani be-I-HEMCiyanda ukuya kuthi ga kwi-0.3%, incochoyi yokuqala ye-exothermic ye-slurry iyalibaziseka, kwaye ixabiso lencochoyi liyehla kancinci kancinci ngokunyuka komxholo we-HEMC; I-HEMC ngokucacileyo iya kulibazisa ixesha lokungeniswa kunye nexesha lokukhawulezisa i-slurry yesamente, kwaye okukhona umxholo umkhulu, kokukhona ixesha lokungeniswa lide, kokukhona ixesha lokukhawuleza libuyela umva, kwaye kokukhona incochoyi ye-exothermic incinci; utshintsho lomxholo we-cellulose ether alunampembelelo icacileyo kubude bexesha lokunciphisa isantya kunye nexesha lokuzinza kwe-slurry yesamente, njengoko kubonisiwe kuMfanekiso 3(a). Kuboniswe ukuba i-cellulose ether inokunciphisa ubushushu be-hydration ye-samente paste kwiiyure ezingama-72, kodwa xa ubushushu be-hydration bungaphezulu kweeyure ezingama-36, utshintsho lomxholo we-cellulose ether alunampembelelo ingako kubushushu be-hydration ye-samente paste, njengoMfanekiso 3(b).
Umfanekiso 3 Utshintsho lwendlela yokukhupha ubushushu ngokufunxa intlama yesamente enomxholo owahlukileyo we-cellulose ether (HEMC)
2. Miipropati zobugcisa：
Ngokufunda iintlobo ezimbini zee-ether ze-cellulose ezine-viscosities ze-60000Pa·s kunye ne-100000Pa·s, kwafunyaniswa ukuba amandla okuxinzelela e-modtar eguqulweyo exutywe ne-methyl cellulose ether ehla kancinci ngokunyuka komxholo wayo. Amandla okuxinzelela e-modtar eguqulweyo exutywe ne-100000Pa·s viscosity hydroxypropyl methyl cellulose ether ayanda kuqala aze anciphe ngokunyuka komxholo wayo (njengoko kubonisiwe kuMfanekiso 4). Ibonisa ukuba ukufakwa kwe-methyl cellulose ether kuya kunciphisa kakhulu amandla okuxinzelela e-samente mortar. Okukhona isixa sininzi, kokukhona amandla aya kuba mancinci; okukhona i-viscosity incinci, kokukhona impembelelo enkulu ekulahlekelweni kwamandla okuxinzelela e-mortar; i-hydroxypropyl methyl cellulose ether Xa umthamo ungaphantsi kwe-0.1%, amandla okuxinzelela e-mortar anokwandiswa ngokufanelekileyo. Xa umthamo ungaphezulu kwe-0.1%, amandla okuxinzelela e-mortar aya kuncipha ngokunyuka komthamo, ngoko ke umthamo kufuneka ulawulwe kwi-0.1%.
Umfanekiso 4 Amandla okuxinzelela e-3d, 7d kunye ne-28d e-MC1, MC2 kunye ne-MC3 modifier yesamente eguquliweyo
(I-Methyl cellulose ether, i-viscosity 60000Pa·S, emva koko ibizwa ngokuba yi-MC1; i-methyl cellulose ether, i-viscosity 100000Pa·S, ebizwa ngokuba yi-MC2; i-hydroxypropyl methylcellulose ether, i-viscosity 100000Pa·S, ebizwa ngokuba yi-MC3).
3. Cixesha lokwabela：
Ngokulinganisa ixesha lokuseta le-hydroxypropyl methylcellulose ether ene-viscosity ye-100000Pa·s kwiidosi ezahlukeneyo ze-cement paste, kwafunyaniswa ukuba ngokonyuka kwedosi ye-HPMC, ixesha lokuqala lokuseta kunye nexesha lokugqibela lokuseta i-samente mortar zandiswa. Xa uxinzelelo luyi-1%, ixesha lokuqala lokuseta lifikelela kwimizuzu engama-510, kwaye ixesha lokugqibela lokuseta lifikelela kwimizuzu engama-850. Xa kuthelekiswa nesampulu engenanto, ixesha lokuqala lokuseta landiswa ngemizuzu engama-210, kwaye ixesha lokugqibela lokuseta landiswa ngemizuzu engama-470 (njengoko kubonisiwe kuMfanekiso 5). Nokuba yi-HPMC ene-viscosity ye-50000Pa s, i-100000Pa s okanye i-200000Pa s, inokulibazisa ukuseta kwesamente, kodwa xa kuthelekiswa nee-ether ezintathu ze-cellulose, ixesha lokuqala lokuseta kunye nexesha lokugqibela lokuseta landiswa ngokonyuka kwe-viscosity, njengoko kubonisiwe kuMfanekiso 6. Oku kungenxa yokuba i-cellulose ether ifunxwa phezu kwamasuntswana esamente, nto leyo ethintela amanzi ukuba angadibani namasuntswana esamente, nto leyo ethintela ukufuma kwesamente. Okukhona i-viscosity ye-cellulose ether ikhula, kokukhona umaleko we-adsorption phezu kwamasuntswana esamente ukhula, kwaye kokukhona isiphumo sokulibazisa sibaluleke ngakumbi.
Umfanekiso 5 Impembelelo yomxholo we-cellulose ether kwixesha lokuseta i-mortar
Umfanekiso 6 Impembelelo yokukhanya okwahlukeneyo kwe-HPMC kwixesha lokuseta intlama yesamente
(MC-5(50000Pa·s), MC-10(100000Pa·s) kunye neMC-20(200000Pa·s))
I-Methyl cellulose ether kunye ne-hydroxypropyl methyl cellulose ether ziya kwandisa kakhulu ixesha lokuseta i-samente slurry, nto leyo enokuqinisekisa ukuba i-samente slurry inexesha elaneleyo kunye namanzi okusabela kwi-hydration, kwaye isombulule ingxaki yamandla aphantsi kunye nengxaki yokugqibela ye-samente slurry emva kokuqina.
4. Ukugcinwa kwamanzi:
Isiphumo somxholo we-cellulose ether ekugcinweni kwamanzi sifundwe. Kufunyaniswe ukuba ngokonyuka komxholo we-cellulose ether, izinga lokugcina amanzi kwi-mortar liyanda, kwaye xa umxholo we-cellulose ether ungaphezulu kwe-0.6%, izinga lokugcina amanzi lihlala lizinzile. Nangona kunjalo, xa kuthelekiswa iintlobo ezintathu ze-cellulose ethers (HPMC ene-viscosity ye-50000Pa s (MC-5), i-100000Pa s (MC-10) kunye ne-200000Pa s (MC-20)), impembelelo ye-viscosity ekugcinweni kwamanzi yahlukile. Ubudlelwane phakathi kwezinga lokugcina amanzi yi: MC-5.
Ixesha leposi: Epreli-28-2024