Cellulose ether ine simba rei pazvinhu zvakagadzirwa nesimende?

1. Kupisa kwemvura

Zvichienderana nekubuda kwekupisa kwemvura nekufamba kwenguva, nzira yemvura yesimende inowanzo kamurwa kuita zvikamu zvishanu, zvinoti, nguva yekutanga yemvura (0~15min), nguva yekudzikisa (15min~4h), nguva yekukurumidzisa nekugadzika (4h~8h), nguva yekudzikamisa uye yekuomesa (8h~24h), uye nguva yekupisa (1d~28d).

Mhedzisiro yebvunzo inoratidza kuti pakutanga kwekudzikisa (kureva, nguva yekutanga yemvura), kana huwandu hweHEMC huri 0.1% zvichienzaniswa neslurry yesimende isina chinhu, peak yeslurry inokwira uye peak inokwira zvakanyanya. Kana huwandu hweHEMCinowedzera kusvika pa 0.3%, peak yekutanga ye exothermic ye slurry inononoka, uye kukosha kwepamusoro kunoderera zvishoma nezvishoma nekuwedzera kwehuwandu hweHEMC; HEMC ichanonotsa nguva ye induction uye nguva yekumhanyisa slurry ye cement, uye kana huwandu hwacho hwakakura, nguva ye induction yakareba, nguva yekumhanyisa inodzokera kumashure, uye peak ye exothermic idiki; shanduko ye cellulose ether haina mhedzisiro yakajeka pakureba kwenguva ye deceleration uye nguva yekugadzikana kwe cement slurry, sezvakaratidzwa muMufananidzo 3(a) Zvinoratidzwa kuti cellulose ether inogonawo kuderedza kupisa kwe hydration ye cement paste mukati memaawa 72, asi kana kupisa kwe hydration kuri kwenguva inopfuura maawa 36, ​​shanduko ye cellulose ether haina mhedzisiro yakawanda pakupisa kwe hydration ye cement paste, senge Mufananidzo 3(b).

Mufananidzo 3. Kuchinja kwemafambiro ekunyorovesa kupisa kwepasimende ine huwandu hwakasiyana hwe cellulose ether (HEMC)

2. Mhunhu hwezvehupfumi：

Nekudzidza marudzi maviri e cellulose ethers ane viscosities ye60000Pa·s uye 100000Pa·s, zvakaonekwa kuti simba rekumanikidza remota yakagadziriswa yakasanganiswa nemethyl cellulose ether rakaderera zvishoma nezvishoma nekuwedzera kwehuwandu hwayo. Simba rekumanikidza remota yakagadziriswa yakasanganiswa ne100000Pa·s viscosity hydroxypropyl methyl cellulose ether rinotanga rawedzera uye rozodzikira nekuwedzera kwehuwandu hwayo (sezvinoratidzwa muMufananidzo 4). Izvi zvinoratidza kuti kuiswa kwemethyl cellulose ether kuchaderedza zvakanyanya simba rekumanikidza remota yesimbi. Huwandu hwayo hwakawanda, simba rayo richava diki; viscosity diki, kukanganisa kukuru pakurasikirwa kwesimba rekumanikidza remota; hydroxypropyl methyl cellulose ether Kana dosage iri pasi pe0.1%, simba rekumanikidza remota rinogona kuwedzerwa zvakakodzera. Kana dosage iri kupfuura 0.1%, simba rekumanikidza remota richadzikira nekuwedzera kwehuwandu, saka dosage inofanira kudzorwa pa0.1%.

Mufananidzo 4: Simba rekudzvanya re3d, 7d uye 28d reMC1, MC2 uye MC3 modified cement mortar

(Methyl cellulose ether, viscosity 60000Pa·S, zvichizotevera inonzi MC1; methyl cellulose ether, viscosity 100000Pa·S, inonzi MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, inonzi MC3).

3. Cnguva yekugovera：

Nekuyera nguva yekugadzika kwehydroxypropyl methylcellulose ether ine viscosity ye100000Pa·s muzviyero zvakasiyana zvesimende paste, zvakaonekwa kuti nekuwedzera kwemuyero weHPMC, nguva yekutanga yekugadzika nenguva yekupedzisira yekugadzika kwesimbi yesimbi yakawedzerwa. Kana huwandu hwacho huri 1%, nguva yekutanga yekugadzika inosvika 510 maminetsi, uye nguva yekupedzisira yekugadzika inosvika 850 maminetsi. Zvichienzaniswa nemuenzaniso usina chinhu, nguva yekutanga yekugadzika inowedzerwa ne210 maminetsi, uye nguva yekupedzisira yekugadzika inowedzerwa ne470 maminetsi (sezvakaratidzwa muMufananidzo 5). Ingave iri HPMC ine viscosity ye50000Pa s, 100000Pa s kana 200000Pa s, inogona kunonotsa kuiswa kwesimende, asi kana ichienzaniswa ne ether nhatu dze cellulose, nguva yekutanga yekugadzika nenguva yekupedzisira yekugadzika inowedzerwa nekuwedzera kwe viscosity, sezvakaratidzwa muMufananidzo 6. Izvi zvinodaro nekuti cellulose ether inonyungudika pamusoro pezvikamu zvesimende, izvo zvinodzivirira mvura kuti isabatane nezvimedu zvesimende, zvichinonotsa kunyorova kwesimende. Kana viscosity ye cellulose ether yakakura, kukora kwe adsorption layer pamusoro pezvikamu zvesimende, uye kukosha kwekudzora kunowedzera.

Mufananidzo 5 Mhedzisiro yemukati me cellulose ether pakuisa nguva yedhaka

Mufananidzo 6. Mhedzisiro yekusiyana kwesimba reHPMC panguva yekuiswa kwesimbi yesimende

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

Methyl cellulose ether uye hydroxypropyl methyl cellulose ether zvichawedzera nguva yekugadzika kwe cement slurry, izvo zvinogona kuita kuti cement slurry ive nenguva yakakwana nemvura yakakwana ye hydration reaction, uye kugadzirisa dambudziko rekushaya simba uye dambudziko rekupera kwe cement slurry mushure mekuoma.

4. Kuchengetwa kwemvura:

Zvakadzidzwa kuti huwandu hwe cellulose ether hunoonekwa sei pakuchengetwa kwemvura. Zvakaonekwa kuti nekuwedzera kwehuwandu hwe cellulose ether, huwandu hwemvura hunoonekwa sei mumortar hunowedzera, uye kana huwandu hwe cellulose ether hwapfuura 0.6%, huwandu hwemvura hunoonekwa sei. Zvisinei, kana tichienzanisa marudzi matatu e cellulose ethers (HPMC ine viscosity ye50000Pa s (MC-5), 100000Pa s (MC-10) uye 200000Pa s (MC-20)), simba re viscosity pakuchengetwa kwemvura rakasiyana. Hukama huripo pakati pehuwandu hwemvura hunoonekwa seiyi: MC-5.