Ether ea cellulose e na le phello efe linthong tse thehiloeng samenteng?

1. Mocheso oa metsi

Ho ya ka mothapo wa ho ntsha mocheso wa metsi ha nako e ntse e ya, tshebetso ya ho ntsha metsi ya samente hangata e arolwa ka mekhahlelo e mehlano, e leng, nako ya pele ya ho ntsha metsi (0~15min), nako ya ho kenya (15min~4h), nako ya ho potlakisa le ho beha (4h~8h), nako ya ho fokotsa le ho thatafatsa (8h~24h), le nako ya ho fodisa (1d~28d).

Liphetho tsa liteko li bontša hore mohatong oa pele oa tlhahiso (ke hore, nako ea pele ea metsi), ha bongata ba HEMC e le 0.1% ha e bapisoa le slurry ea samente e se nang letho, tlhoro ea exothermic ea slurry e tsoetse pele 'me tlhoro e eketseha haholo. Ha bongata baHEMCe eketseha ho fihlela ho Ha e le kaholimo ho 0.3%, tlhoro ea pele ea exothermic ea slurry e lieha, 'me boleng ba tlhōrō bo fokotseha butle-butle ka keketseho ea litaba tsa HEMC; Ho hlakile hore HEMC e tla liehisa nako ea tlhahiso le nako ea ho potlakisa ea slurry ea samente, 'me ha litaba li le kholoanyane, nako ea tlhahiso e telele, nako ea ho potlakisa e khutlela morao haholo, 'me tlhoro ea exothermic e nyane; phetoho ea litaba tsa ether ea cellulose ha e na phello e totobetseng boleleleng ba nako ea ho fokotsa le nako ea botsitso ea slurry ea samente, joalo ka ha ho bontšitsoe ho Setšoantšo sa 3(a) Ho bontšitsoe hore ether ea cellulose e ka boela ea fokotsa mocheso oa hydration ea cement ea samente nakong ea lihora tse 72, empa ha mocheso oa hydration o le telele ho feta lihora tse 36, phetoho ea litaba tsa ether ea cellulose ha e na phello e nyane mochesong oa hydration ea cement ea samente, joalo ka Setšoantšo sa 3(b).

Setšoantšo sa 3. Phetoho ea mokhoa oa ho ntša metsi mochesong oa semente ka tekanyo e fapaneng ea ether ea cellulose (HEMC)

2. Mthepa ea moruo：

Ka ho ithuta mefuta e 'meli ea li-ether tsa cellulose tse nang le viscosities ea 60000Pa·s le 100000Pa·s, ho fumanoe hore matla a khatello a seretse se fetotsoeng se kopantsoeng le methyl cellulose ether a fokotseha butle-butle ka keketseho ea litaba tsa sona. Matla a khatello a seretse se fetotsoeng se kopantsoeng le viscosity ea 100000Pa·s hydroxypropyl methyl cellulose ether a eketseha pele ebe a fokotseha ka keketseho ea litaba tsa sona (joalokaha ho bontšitsoe Setšoantšong sa 4). E bontša hore ho kenyelletsoa ha methyl cellulose ether ho tla fokotsa matla a khatello a seretse sa samente haholo. Ha bongata bo le bongata, matla a tla ba manyane; ha viscosity e le nyane, tšusumetso e kholo tahlehelong ea matla a khatello a seretse; hydroxypropyl methyl cellulose ether Ha tekanyo e le ka tlase ho 0.1%, matla a khatello a seretse a ka eketsoa ka nepo. Ha tekanyo e le ho feta 0.1%, matla a khatello a seretse a tla fokotseha ka keketseho ea tekanyo, kahoo tekanyo e lokela ho laoloa ho 0.1%.

Setšoantšo sa 4: Matla a khatello a 3d, 7d le 28d a seretse sa samente se fetotsoeng sa MC1, MC2 le MC3

(Methyl cellulose ether, viscosity 60000Pa·S, ho tloha joale e tla bitsoa MC1; methyl cellulose ether, viscosity 100000Pa·S, e tla bitsoa MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, e tla bitsoa MC3).

3. Cnako ea ho arola：

Ka ho lekanya nako ea ho beha ea hydroxypropyl methylcellulose ether ka viscosity ea 100000Pa·s ka litekanyo tse fapaneng tsa peista ea samente, ho fumanoe hore ka keketseho ea tekanyo ea HPMC, nako ea pele ea ho beha le nako ea ho qetela ea ho beha ea seretse sa samente li ile tsa lelefatsoa. ​​Ha mahloriso e le 1%, nako ea pele ea ho beha e fihla metsotso e 510, 'me nako ea ho qetela ea ho beha e fihla metsotso e 850. Ha ho bapisoa le sampole e se nang letho, nako ea pele ea ho beha e atolosoa ka metsotso e 210, 'me nako ea ho qetela ea ho beha e atolosoa ka metsotso e 470 (joalokaha ho bontšitsoe ho Setšoantšo sa 5). Ebang ke HPMC e nang le viscosity ea 50000Pa s, 100000Pa s kapa 200000Pa s, e ka liehisa ho beha ha samente, empa ha e bapisoa le li-ether tse tharo tsa cellulose, nako ea pele ea ho beha le nako ea ho qetela ea ho beha e atolosoa ka keketseho ea viscosity, joalo ka ha ho bontšitsoe ho Setšoantšo sa 6 se bontšitsoeng. Lebaka ke hobane ether ea cellulose e monngoa holim'a likaroloana tsa samente, e leng se thibelang metsi ho kopana le likaroloana tsa samente, ka hona se liehisa ho monyela ha samente. Ha ether ea cellulose e le matla haholo, lera la ho monya holim'a likaroloana tsa samente le ba letenya, 'me phello ea ho liehisa e ba ea bohlokoa haholo.

Setšoantšo sa 5. Phello ea selulose ether ka har'a nako ea ho beha seretse

Setšoantšo sa 6. Phello ea ho teteana ho fapaneng ha HPMC nakong ea ho beha peista ea samente

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

Methyl cellulose ether le hydroxypropyl methyl cellulose ether li tla lelefatsa nako ea ho beha slurry ea samente haholo, e leng se ka netefatsang hore slurry ea samente e na le nako e lekaneng le metsi bakeng sa karabelo ea metsi, le ho rarolla bothata ba matla a tlase le bothata ba ho petsoha ha slurry ea samente kamora ho thatafala.

4. Ho boloka metsi:

Tšusumetso ea selulose ether ho bolokeng metsi e ithutiloe. Ho fumanoe hore ka keketseho ea selulose ether, sekhahla sa ho boloka metsi sa seretse sea eketseha, 'me ha selulose ether se le seholo ho feta 0.6%, sekhahla sa ho boloka metsi se atisa ho ba se tsitsitseng. Leha ho le joalo, ha ho bapisoa mefuta e meraro ea li-ether tsa cellulose (HPMC e nang le viscosity ea 50000Pa s (MC-5), 100000Pa s (MC-10) le 200000Pa s (MC-20)), tšusumetso ea viscosity ho bolokeng metsi e fapane. Kamano pakeng tsa sekgahla sa ho boloka metsi ke: MC-5.