Chii chinoita kuti cellulose ether iite pazvinhu zvine simende?

1. Kupisa kwe hydration

Zvinoenderana nekubuda kwekupisa kwekupisa kwe hydration nekufamba kwenguva, iyo hydration process ye simenti inowanzo patsanurwa kuita nhanho shanu, dzinoti, yekutanga hydration nguva (0 ~ 15min), iyo induction nguva (15min ~ 4h), iyo yekukurumidza uye yekumisikidza nguva (4h ~ 8h), deceleration uye kuoma nguva (8h ~ 24h), uye curing 24h nguva (1 ~ 24h) .

Mhedzisiro yemhedzisiro inoratidza kuti padanho rekutanga reinduction (kureva, iyo yekutanga hydration nguva), apo huwandu hweHEMC huri 0.1% kana ichienzaniswa neyakavhurika simende slurry, iyo exothermic peak ye slurry yakakwira uye iyo peak inowedzera zvakanyanya. Kana huwandu hweHEMCinowedzera kusvika Kana iri pamusoro pe0.3%, yekutanga exothermic peak ye slurry inononoka, uye iyo yepamusoro yepamusoro inoderera zvishoma nezvishoma nekuwedzera kweHEMC zvinyorwa; HEMC ichaita sezviri pachena kunonoka nguva yekupinza uye kukurumidza nguva yesamende slurry, uye iyo yakakura zvirimo, iyo yakareba nguva yekupinza, iyo inodzokera kumashure nguva yekumhanyisa, uye idiki iyo exothermic peak; kuchinja kwe cellulose ether content haina mhedzisiro yakajeka pakureba kwekureba uye nguva yekudzikama kwesamende slurry, sezvakaratidzwa mumufananidzo 3 (a) Zvinoratidzwa kuti cellulose ether inogonawo kuderedza kupisa kwe hydration ye simenti paste mukati maawa 72, asi kana kupisa kwe hydration kwakareba kupfuura maawa 36, ​​kuchinja kwesero ye hydration kune kuchinja kwesero. namatidza, semufananidzo 3(b).

Fig.3 Kusiyana kwemaitiro e hydration heat release rate ye simenti paste ine zvakasiyana-siyana zve cellulose ether (HEMC)

2. Mechanical properties:

Nokudzidza marudzi maviri e-cellulose ethers ane viscosities ye60000Pa · s uye 100000Pa · s, zvakaonekwa kuti simba rekumanikidzika remodhi yakagadziridzwa yakasanganiswa nemethyl cellulose ether yakaderera zvishoma nezvishoma nekuwedzera kwezvinyorwa zvayo. Simba rekumanikidzika revhu rakagadziridzwa rakasanganiswa ne100000Pa · s viscosity hydroxypropyl methyl cellulose ether inowedzera kutanga uye inoderera nekuwedzera kwezvinhu zvayo (sezvinoratidzwa mumufananidzo 4). Zvinoratidza kuti kubatanidzwa kwemethyl cellulose ether kuchaderedza zvakanyanya kusimba kwesimba resimende dhaka. Iyo yakawanda yakawanda, iyo idiki simba richava; iyo diki iyo viscosity, iyo yakakura kukanganisa pakurasikirwa kwedhaka rekumanikidza simba; hydroxypropyl methyl cellulose ether Kana iyo dosi iri pasi pe0.1%, simba rekumanikidza redhaka rinogona kuwedzerwa zvakakodzera. Kana iyo dosage inopfuura 0.1%, iyo yekumanikidza simba redhaka ichaderera nekuwedzera kweiyo dosi, saka dosi inofanira kudzorwa pa 0.1%.

Fig.4 3d, 7d uye 28d compressive simba yeMC1, MC2 uye MC3 yakagadziridzwa simende dhaka.

(Methyl cellulose ether, viscosity 60000Pa · S, panozonzi MC1; methyl cellulose ether, viscosity 100000Pa · S, inonzi MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa · S, inonzi MC2).

3. Ckutora nguva:

Nekuyera nguva yekumisikidza yehydroxypropyl methylcellulose ether ine viscosity ye100000Pa · s mune zvakasiyana dosages yesamende paste, zvakaonekwa kuti nekuwedzera kweHPMC dosage, nguva yekutanga yekuisa uye yekupedzisira nguva yekumisikidza simende yakawedzera. Kana kusungirirwa kuri 1%, nguva yekutanga yekuisa inosvika 510 maminitsi, uye nguva yekupedzisira yekuisa inosvika 850 maminetsi. Kuenzaniswa nemuenzaniso usina chinhu, nguva yekutanga yekugadzirisa inowedzerwa nemaminitsi e210, uye nguva yekupedzisira inowedzerwa nemaminitsi e470 (sezvinoratidzwa mumufananidzo 5). Ingave iri HPMC ine viscosity ye50000Pa s, 100000Pa s kana 200000Pa s, inogona kunonoka kuisa simenti, asi kana ichienzaniswa nematatu e-cellulose ethers, nguva yekutanga yekugadzirisa uye nguva yekupedzisira yekugadzirisa inowedzerwa nekuwedzera kwe viscosity, sezvinoratidzwa mumufananidzo 6. Izvi zvinodaro nekuti cellulose ether inoshongedzwa pamusoro pemasimende, izvo zvinodzivirira mvura kuti isasangana nezvikamu zvesimende, nokudaro inonoke kuyerera kwesamende. Iyo yakakura viscosity ye cellulose ether, iyo yakakura iyo adsorption layer iri pamusoro pezvikamu zvesimende, uye zvakanyanya kukosha kudzoreredza mhedzisiro.

Fig.5 Mhedzisiro ye cellulose ether zvirimo pakugadzika nguva yedhaka

Fig.6 Mhedzisiro yemaviscosities akasiyana eHPMC panguva yekuisa simende paste

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

Methyl cellulose ether uye hydroxypropyl methyl cellulose ether ichawedzera zvakanyanya nguva yekuisa simende slurry, iyo inogona kuve nechokwadi kuti simende slurry ine nguva yakakwana uye mvura ye hydration reaction, uye kugadzirisa dambudziko rekuderera kwesimba uye danho rekupedzisira resimende slurry mushure mekuoma. dambudziko rekuputika.

4. Kuchengeta mvura:

Mhedzisiro ye cellulose ether yemukati pakuchengetedza mvura yakadzidzwa. Inowanikwa kuti nekuwedzera kwezvinyorwa zve cellulose ether, chiyero chekuchengetedza mvura yedhaka chinowedzera, uye kana zvinyorwa zve cellulose ether zvakakura kupfuura 0.6%, chiyero chekuchengetedza mvura chinowanzove chakasimba. Nekudaro, kana tichienzanisa marudzi matatu e cellulose ethers (HPMC ine viscosity ye50000Pa s (MC-5), 100000Pa s (MC-10) uye 200000Pa s (MC-20)), pesvedzero ye viscosity pakuchengetedza mvura yakasiyana. Hukama huri pakati pehuwandu hwekuchengetedza mvura ndehwe: MC-5.