1. Okpomọkụ nke hydration
Dị ka ntọhapụ usoro nke okpomọkụ nke hydration ka oge na-aga, usoro hydration nke ciment na-ekewakarị n'ime usoro ise, ya bụ, oge mbụ hydration (0 ~ 15min), oge induction (15min ~ 4h), ngwa ngwa na nhazi oge (4h ~ 8h ), deceleration na hardening period (8h ~ 24h), na ọgwụgwọ oge (1d ~ 24h).
Nsonaazụ ule na-egosi na n'oge mmalite nke induction (ya bụ, oge mbụ hydration), mgbe ọnụọgụ HEMC dị 0.1% ma e jiri ya tụnyere ciment slurry efu, ọnụ ọgụgụ dị elu nke exothermic nke slurry na-abawanye na ọnụ ọgụgụ kasị elu na-abawanye ụba. Mgbe ego nkeHEMCna-abawanye na Mgbe ọ dị n'elu 0.3%, ọnụ ọgụgụ mbụ exothermic nke slurry na-egbu oge, ọnụ ahịa ọnụ ọgụgụ kasị elu ji nwayọọ nwayọọ na-ebelata na mmụba nke ọdịnaya HEMC; O doro anya na HEMC ga-egbu oge oge ntinye na oge osooso nke ciment slurry, na ọdịnaya dị ukwuu, ogologo oge ntinye ahụ, ka oge na-aga n'ihu na-eme ngwa ngwa, na obere ihe dị elu nke exothermic; mgbanwe nke cellulose ether ọdịnaya enweghị mmetụta doro anya na ogologo oge nke deceleration na oge nkwụsi ike nke ciment slurry, dị ka e gosiri na Figure 3 (a) E gosipụtara na cellulose ether nwekwara ike ibelata okpomọkụ nke hydration nke ciment mado n'ime 72 awa, ma mgbe okpomọkụ nke hydration bụ ogologo oge karịa 36 awa, mgbanwe nke cellulose mmetụta dị otú ahụ dị ka okpomọkụ nke hydration dị otú ahụ. Foto nke 3 (b).
Fig.3 mgbanwe mgbanwe nke hydration okpomọkụ ntọhapụ ọnụego nke ciment mado na dị iche iche ọdịnaya nke cellulose ether (HEMC)
2. Mechanical Njirimara:
Site n'ịmụ ụdị cellulose ethers abụọ nwere viscosities nke 60000Pa·s na 100000Pa·s, a chọpụtara na ike mkpakọ nke ngwa agha a gbanwere na methyl cellulose ether ji nwayọọ nwayọọ na-abawanye site na mmụba nke ọdịnaya ya. Ike mkpakọ nke ngwa agha gbanwetụrụ na 100000Pa·s viscosity hydroxypropyl methyl cellulose ether na-abawanye na mbụ wee belata na mmụba nke ọdịnaya ya (dị ka egosiri na eserese 4). Ọ na-egosi na ntinye nke methyl cellulose ether ga-ebelata nke ukwuu ike mkpakọ nke simenti ngwa agha. Ọnụ ọgụgụ ka ukwuu, ike ga-adị ntakịrị; nke nta nke viscosity, nke ukwuu mmetụta na ọnwụ nke ngwa agha mkpakọ ike; hydroxypropyl methyl cellulose ether Mgbe usoro onunu ogwu erughị 0.1%, ike mkpakọ nke ngwa agha nwere ike ịbawanye nke ọma. Mgbe usoro onunu ogwu kariri 0.1%, ike mkpakọ nke ngwa agha ga-ebelata na mmụba nke usoro onunu ogwu, ya mere a ga-achịkwa usoro onunu na 0.1%.
Fig.4 3d, 7d na 28d ike mkpakọ nke MC1, MC2 na MC3 meziri ngwa ngwa ciment.
(Methyl cellulose ether, viscosity 60000Pa·S, nke a na-akpọ MC1; methyl cellulose ether, viscosity 100000Pa·S, nke a na-akpọ MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, nke a na-akpọ MC).
3.Coge otutu:
Site n'ịtụ oge nhazi nke hydroxypropyl methylcellulose ether na viscosity nke 100000Pa·s na dosages dị iche iche nke ciment mado, a chọpụtara na na mmụba nke usoro onunu ogwu HPMC, oge nhazi mbụ na oge nhazi ikpeazụ nke ciment mortar na-agbatị ogologo oge. Mgbe itinye uche bụ 1%, oge ntọala mbụ ruru nkeji 510, na oge nhazi ikpeazụ ruru nkeji 850. E jiri ya tụnyere oghere oghere, a na-agbatị oge ntọala mbụ site na nkeji 210, a na-agbatị oge nhazi ikpeazụ site na nkeji 470 (dị ka egosiri na foto 5). Ma ọ bụ HPMC na viscosity nke 50000Pa s, 100000Pa s ma ọ bụ 200000Pa s, ọ nwere ike igbu oge nhazi nke ciment, ma e jiri ya tụnyere cellulose ethers atọ, oge nhazi mbụ na oge nhazi ikpeazụ na-agbatịkwu ogologo oge na mmụba nke viscosity, dị ka egosiri na Figure 6. Nke a bụ n'ihi na a na-agbanye cellulose ether n'elu ihe ndị dị na ciment, nke na-egbochi mmiri ka ọ ghara ịchọta na simenti, si otú ahụ na-egbu oge hydration nke ciment. Ka viscosity nke cellulose ether na-abawanye, ka oyi akwa adsorption na-adị n'elu irighiri ciment, na mmetụta na-ebelata.
Fig.5 Mmetụta nke cellulose ether ọdịnaya na ịtọ oge nke ngwa agha
Fig.6 Mmetụta dị iche iche viscosities nke HPMC na mwube oge nke ciment mado
(MC-5 (50000Pa·s), MC-10 (100000Pa·s) na MC-20 (200000Pa·s))
Methyl cellulose ether na hydroxypropyl methyl cellulose ether ga-agbatịkwu mwube oge nke ciment slurry, nke nwere ike hụ na ciment slurry nwere oge zuru ezu na mmiri maka hydration mmeghachi omume, na-edozi nsogbu nke ala ike na mbubreyo ogbo nke ciment slurry mgbe hardening. nsogbu mgbawa.
4. Njide mmiri:
A mụrụ mmetụta nke cellulose ether ọdịnaya na njide mmiri. Achọpụtara na mmụba nke ọdịnaya nke cellulose ether, ọnụ ọgụgụ njide mmiri nke ụrọ na-abawanye, na mgbe ọdịnaya nke cellulose ether karịrị 0.6%, ọnụ ọgụgụ njide mmiri na-eme ka ọ kwụsie ike. Otú ọ dị, mgbe atụnyere ụdị atọ nke cellulose ethers (HPMC na a viscosity nke 50000Pa s (MC-5), 100000Pa s (MC-10) na 200000Pa s (MC-20)), mmetụta nke viscosity na mmiri njide dị iche iche. Mmekọrịta dị n'etiti ọnụego njide mmiri bụ: MC-5.
Oge nzipu: Eprel-28-2024