1. Ukushisa komswakama
Ngokwejika lokukhululwa kokushisa kokumuncwa ngokuhamba kwesikhathi, inqubo yokumuncwa kwesimende ivame ukuhlukaniswa ngezigaba ezinhlanu, okungukuthi, isikhathi sokuqala sokumuncwa (0~15min), isikhathi sokungeniswa (15min~4h), isikhathi sokusheshisa nokubeka (4h~8h), isikhathi sokunciphisa ijubane nokuqina (8h~24h), kanye nesikhathi sokupholisa (1d~28d).
Imiphumela yokuhlolwa ikhombisa ukuthi esigabeni sokuqala sokungeniswa (okungukuthi, isikhathi sokuqala sokufakwa kwamanzi), lapho inani le-HEMC lingu-0.1% uma liqhathaniswa ne-slurry yesamente engenalutho, i-peak exothermic ye-slurry iyathuthuka futhi i-peak iyanda kakhulu. Lapho inani le-I-HEMCiyanda ibe ngaphezulu kuka-0.3%, i-exothermic peak yokuqala ye-slurry iyabambezeleka, futhi inani eliphakeme liyehla kancane kancane ngokwanda kokuqukethwe kwe-HEMC; I-HEMC ngokusobala izolibazisa isikhathi sokungeniswa kanye nesikhathi sokusheshisa kwe-slurry yesamente, futhi lapho okuqukethwe kukhulu, isikhathi sokungeniswa side, isikhathi sokusheshisa sibuyela emuva kakhulu, futhi i-exothermic peak incane; ushintsho lokuqukethwe kwe-cellulose ether alunawo umphumela ocacile ebudeni besikhathi sokwehla kanye nesikhathi sokuqina kwe-slurry yesamente, njengoba kuboniswe kuMfanekiso 3(a). Kuboniswa ukuthi i-cellulose ether inganciphisa nokushisa kwe-hydration ye-cement paste zingakapheli amahora angu-72, kodwa lapho ukushisa kwe-hydration kungaphezu kwamahora angu-36, ushintsho lokuqukethwe kwe-cellulose ether alunawo umphumela omncane ekushiseni kwe-hydration ye-cement paste, njengeMfanekiso 3(b).
Umfanekiso 3 Ukwehluka kwesimo sokukhishwa kokushisa kwe-hydration ye-cement paste enokuqukethwe okuhlukile kwe-cellulose ether (HEMC)
2. Mizakhiwo zemvelo：
Ngokufunda izinhlobo ezimbili zama-ether e-cellulose ane-viscosities yama-60000Pa·s nama-100000Pa·s, kwatholakala ukuthi amandla okucindezela e-modtar eguquliwe exutshwe ne-methyl cellulose ether ehla kancane kancane ngokwanda kokuqukethwe kwayo. Amandla okucindezela e-modtar eguquliwe exutshwe ne-100000Pa·s viscosity hydroxypropyl methyl cellulose ether ayanda kuqala bese ehla ngokwanda kokuqukethwe kwayo (njengoba kuboniswe kuMfanekiso 4). Kubonisa ukuthi ukufakwa kwe-methyl cellulose ether kuzonciphisa kakhulu amandla okucindezela e-cement mortar. Uma inani lilikhulu, amandla ayoba mancane; lapho i-viscosity incane, kulapho umthelela omkhulu ekulahlekelweni kwamandla okucindezela e-mortar; i-hydroxypropyl methyl cellulose ether Uma umthamo ungaphansi kuka-0.1%, amandla okucindezela e-mortar angakhushulwa ngokufanele. Uma umthamo ungaphezu kuka-0.1%, amandla okucindezela e-mortar azoncipha ngokwanda komthamo, ngakho-ke umthamo kufanele ulawulwe ku-0.1%.
Isithombe 4: Amandla okucindezela e-MC1, MC2 kanye ne-MC3 aguquliwe esimendeni esino-3d, 7d kanye no-28d
(I-Methyl cellulose ether, i-viscosity engu-60000Pa·S, okuzobizwa ngayo kamuva njenge-MC1; i-methyl cellulose ether, i-viscosity engu-100000Pa·S, okuzobizwa ngayo njenge-MC2; i-hydroxypropyl methylcellulose ether, i-viscosity engu-100000Pa·S, okuzobizwa ngayo njenge-MC3).
3. Cisikhathi sokwaba：
Ngokulinganisa isikhathi sokusetha se-hydroxypropyl methylcellulose ether ene-viscosity engu-100000Pa·s ngemithamo ehlukene ye-cement paste, kwatholakala ukuthi ngokwanda komthamo we-HPMC, isikhathi sokuqala sokusetha kanye nesikhathi sokugcina sokusetha se-cement mortar kwandiswa. Lapho ukuhlushwa kungu-1%, isikhathi sokuqala sokusetha sifinyelela kumaminithi angu-510, kanti isikhathi sokugcina sokusetha sifinyelela kumaminithi angu-850. Uma kuqhathaniswa nesampula engenalutho, isikhathi sokuqala sokusetha sandiswa ngemizuzu engu-210, kanti isikhathi sokugcina sokusetha sandiswa ngemizuzu engu-470 (njengoba kuboniswe kuMfanekiso 5). Kungakhathaliseki ukuthi yi-HPMC ene-viscosity engu-50000Pa s, 100000Pa s noma 200000Pa s, ingalibazisa ukusetha kwe-cement, kodwa uma kuqhathaniswa nama-ether amathathu e-cellulose, isikhathi sokuqala sokusetha kanye nesikhathi sokugcina sokusetha sandiswa ngokwanda kwe-viscosity, njengoba kuboniswe kuMfanekiso 6 obonisiwe. Lokhu kungenxa yokuthi i-cellulose ether inamathele ebusweni bezinhlayiya zesimende, okuvimbela amanzi ukuthi angaxhumani nezinhlayiya zesimende, ngaleyo ndlela kubambezele ukumuncwa kwesimende. Uma i-viscosity ye-cellulose ether inkulu, ungqimba lokumuncwa luba lukhulu ebusweni bezinhlayiya zesimende, futhi umphumela wokulibazisa uba mkhulu kakhulu.
Isithombe 5 Umphumela wokuqukethwe kwe-cellulose ether esikhathini sokusetha kwe-mortar
Isithombe 6 Umphumela wokuqina okuhlukene kwe-HPMC esikhathini sokubeka i-paste yesimende
(MC-5(50000Pa·s), MC-10(100000Pa·s) kanye ne-MC-20(200000Pa·s))
I-Methyl cellulose ether kanye ne-hydroxypropyl methyl cellulose ether kuzokwandisa kakhulu isikhathi sokusetha i-slurry yesimende, okungaqinisekisa ukuthi i-slurry yesimende inesikhathi esanele namanzi okusabela kokumanzisa, futhi kuxazululwe inkinga yamandla aphansi kanye nenkinga yokuqhekeka kwe-slurry yesimende ngemuva kokuqina.
4. Ukugcinwa kwamanzi:
Umphumela wokuqukethwe kwe-cellulose ether ekugcinweni kwamanzi ufundwe. Kutholakale ukuthi ngokwanda kokuqukethwe kwe-cellulose ether, izinga lokugcina amanzi ku-mortar liyakhula, futhi lapho okuqukethwe kwe-cellulose ether kungaphezu kuka-0.6%, izinga lokugcina amanzi livame ukuba lizinzile. Kodwa-ke, uma kuqhathaniswa izinhlobo ezintathu ze-cellulose ethers (i-HPMC ene-viscosity engu-50000Pa s (MC-5), 100000Pa s (MC-10) kanye no-200000Pa s (MC-20)), ithonya le-viscosity ekugcinweni kwamanzi lihlukile. Ubudlelwano phakathi kwezinga lokugcina amanzi yilo: MC-5.
Isikhathi sokuthunyelwe: Ephreli-28-2024