Mmetụta dị aṅaa ka cellulose ether nwere n'ihe ndị e ji simenti mee?

1. Okpomọkụ nke mmiri mmiri

Dịka usoro mwepụta nke okpomọkụ nke mmiri ka oge na-aga si dị, a na-ekewa usoro mmiri nke simenti n'ime usoro ise, ya bụ, oge mmiri mbụ (0~15min), oge ntinye (15min~4h), oge ọsọ na ntọala (4h~8h), oge mbelata na ike (8h~24h), na oge ọgwụgwọ (1d~28d).

Nsonaazụ ule ahụ gosiri na n'oge mmalite nke induction (ya bụ, oge mmiri mmiri mbụ), mgbe ọnụọgụ HEMC dị 0.1% ma e jiri ya tụnyere simenti efu, oke mmiri mmiri nke slurry ahụ na-aga n'ihu ma elu ya na-abawanye nke ukwuu. Mgbe ọnụọgụ mmiri mmiri ahụ ruru 1.5%, oke mmiri mmiri ahụ na-abawanye nke ukwuu.Ụlọ ọrụ ahụike (HEMC)na-abawanye ruo Mgbe ọ gafere 0.3%, elu exothermic mbụ nke slurry na-egbu oge, uru kachasị elu na-ebelatakwa nwayọ nwayọ ka mmụba nke ọdịnaya HEMC; HEMC ga-egbu oge mmalite na oge mmepe nke slurry simenti, na ka ọdịnaya ahụ na-abawanye, oge mmepe ahụ na-adịte aka, oge mmepe ahụ na-alaghachi azụ, na oke exothermic pere mpe; mgbanwe nke ọdịnaya cellulose ether enweghị mmetụta doro anya na ogologo oge mbelata na oge nkwụsi ike nke slurry simenti, dịka egosiri na Foto 3(a) Egosiri na cellulose ether nwekwara ike ibelata okpomọkụ nke mmiri mmiri nke simenti n'ime awa 72, mana mgbe okpomọkụ nke mmiri mmiri dị ogologo karịa awa 36, ​​mgbanwe nke ọdịnaya cellulose ether enweghị mmetụta dị ukwuu na okpomọkụ nke mmiri mmiri nke simenti, dị ka Foto 3(b).

Fig.3. Mgbanwe nke usoro mmiri mmiri na okpomọkụ nke simenti mado nwere ọdịnaya dị iche iche nke cellulose ether (HEMC)

2. MNjirimara teknụzụ:

Site n'ịmụ ụdị ether cellulose abụọ nwere viscosities nke 60000Pa·s na 100000Pa·s, achọpụtara na ike nrụgide nke moto agbanwere agbanwe agwakọtara na methyl cellulose ether belatara nwayọọ nwayọọ ka ọdịnaya ya na-abawanye. Ike nrụgide nke moto agbanwere agbanwe agwakọtara na 100000Pa·s viscosity hydroxypropyl methyl cellulose ether na-abawanye na mbụ wee belata ka ọdịnaya ya na-abawanye (dịka egosiri na Foto 4). Ọ na-egosi na itinye methyl cellulose ether ga-ebelata ike nrụgide nke moto simenti nke ukwuu. Ka ọnụọgụ ahụ na-abawanye, otú ahụ ka ike ahụ ga-adị obere; obere viscosity ahụ, otú ahụ ka mmetụta ya na mfu nke ike nrụgide moto na-abawanye; hydroxypropyl methyl cellulose ether Mgbe usoro ọgwụgwọ ahụ erughị 0.1%, ike nrụgide nke moto ahụ nwere ike ịbawanye nke ọma. Mgbe usoro ọgwụgwọ ahụ karịrị 0.1%, ike nrụgide nke moto ahụ ga-ebelata ka mmụba nke usoro ọgwụgwọ ahụ sikwuo ike, yabụ a ga-achịkwa usoro ọgwụgwọ ahụ na 0.1%.

Fig.4 Ike nrụgide nke 3d, 7d na 28d nke moto simenti MC1, MC2 na MC3 gbanwere

(Methyl cellulose ether, viscosity 60000Pa·S, nke a na-akpọ MC1 ugbu a; methyl cellulose ether, viscosity 100000Pa·S, nke a na-akpọ MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, nke a na-akpọ MC3).

3. Coge ịkụ ihe:

Site n'ịtụ oge ntọala nke hydroxypropyl methylcellulose ether na viscosity nke 100000Pa·s na usoro dị iche iche nke simenti mado, achọpụtara na ka ọnụọgụ HPMC na-abawanye, oge ntọala mbụ na oge ntọala ikpeazụ nke simenti na-agbatị. Mgbe ntinye ahụ bụ 1%, oge ntọala mbụ ruru nkeji 510, oge ntọala ikpeazụ na-erukwa nkeji 850. Ma e jiri ya tụnyere ihe nlele efu, oge ntọala mbụ na-agbatị site na nkeji 210, oge ntọala ikpeazụ na-agbatị site na nkeji 470 (dịka egosiri na Foto 5). Ma ọ bụ HPMC nwere viscosity nke 50000Pa s, 100000Pa s ma ọ bụ 200000Pa s, ọ nwere ike igbu oge ntọala nke simenti, mana ma e jiri ya tụnyere cellulose ethers atọ ahụ, oge ntọala mbụ na oge ntọala ikpeazụ na-agbatị site na mmụba nke viscosity, dịka egosiri na Foto 6 egosiri. Nke a bụ n'ihi na cellulose ether na-abanye n'elu ihe ndị e ji simenti mee, nke na-egbochi mmiri ịbanye na ihe ndị e ji simenti mee, si otú a na-egbochi mmiri ịbanye na simenti. Ka cellulose ether na-adịkwu, otú ahụ ka oyi akwa adsorption dị n'elu ihe ndị e ji simenti mee si dị arọ, otú ahụ ka mmetụta nkwụsị ahụ si dịkwuo ukwuu.

Fig.5 Mmetụta nke ọdịnaya cellulose ether na ịtọ oge nke ngwa agha

Fig.6 Mmetụta nke viscosity dị iche iche nke HPMC na oge ntọala nke mado simenti

(MC-5(50000Pa·s), MC-10(100000Pa·s) na MC-20(200000Pa·s))

Methyl cellulose ether na hydroxypropyl methyl cellulose ether ga-eme ka oge ntọala nke simenti slurry dị ogologo, nke nwere ike ime ka simenti slurry nwee oge na mmiri zuru oke maka mmeghachi omume mmiri, ma dozie nsogbu nke obere ike na oge ikpeazụ nke simenti slurry mgbe ọ gbasiri ike.

4. Njide mmiri:

A mụrụ mmetụta nke cellulose ether nwere na njigide mmiri. A chọpụtara na ka ọdịnaya cellulose ether na-abawanye, ọnụego njigide mmiri nke moto na-abawanye, mgbe ọdịnaya cellulose ether karịrị 0.6%, ọnụego njigide mmiri na-adịgide. Agbanyeghị, mgbe a na-atụnyere ụdị cellulose ethers atọ (HPMC nwere viscosity nke 50000Pa s (MC-5), 100000Pa s (MC-10) na 200000Pa s (MC-20)), mmetụta nke viscosity na njigide mmiri dị iche. Mmekọrịta dị n'etiti ọnụego njigide mmiri bụ: MC-5.