Kuvandudza mhedzisiro yehydroxypropyl methylcellulose (HPMC) pane simende-yakavakirwa zvinhu.

Mumakore achangopfuura, nekuenderera mberi kwekuvandudza tekinoroji yekunze kwemadziro ekudzivirira, kuenderera mberi kwehunyanzvi hwekugadzira cellulose, uye hunhu hwakanakisa hweHPMC pachayo, HPMC yakashandiswa zvakanyanya muindasitiri yekuvaka.

Kuti uwedzere kuongorora maitiro ekuita pakati pehydroxypropyl methylcellulose (HPMC) uye simenti-based materials, pepa iri rinotarisa pakuvandudzwa kweJinshuiqiao hydroxypropyl methylcellulose (HPMC) pahutano hwakabatana hwesimenti-based materials.

nguva yekuvhara

Nguva yekugadzika kongiri inonyanya kuenderana nekugadzika nguva yesamende, uye iyo yakaunganidzwa haina pesvedzero shoma, saka nguva yekumisikidza yedhaka inogona kushandiswa pachinzvimbo chekudzidza pesvedzero yeHPMC pakugadzika nguva yepasi pemvura isingaparadzike kongiri musanganiswa, nokuti nguva yekugadzira dhaka inobatwa nemvura Nokudaro, kuitira kuti uongorore kushanda kweHPMC panguva yekugadzika kwedhaka, zvakakosha kugadzirisa mvura-samende ratio uye dhaka revhu.

Zvinoenderana nekuyedza, kuwedzera kweHPMC kune yakakosha kudzoreredza musanganiswa wedhaka, uye nguva yekumisikidza yedhaka inorebesa zvakateerana nekuwedzera kweiyo HPMC yemukati. Pasi pezvakafanana zveHPMC, dhaka rakaumbwa repasi pemvura rinokurumidza kupfuura dhaka rakaumbwa mumhepo. Nguva yekugadzika yekuumbwa kwepakati yakareba. Kana yakayerwa mumvura, kana ichienzaniswa neyakavharika sampuli, nguva yekumisikidza yedhaka yakasanganiswa neHPMC inononoka nemaawa 6-18 ekutanga kuseta uye 6-22 maawa ekupedzisira kuseta. Naizvozvo, HPMC inofanira kushandiswa pamwe chete neaccelerators.

HPMC i-high-molecular polymer ine macromolecular linear structure uye boka re hydroxyl paboka rinoshanda, iro rinogona kuumba hydrogen zvisungo pamwe nekusanganiswa kwemvura molecules uye kuwedzera viscosity yemvura inosanganiswa. Iwo akareba mashetani echeni eHPMC anokwezva mumwe nemumwe, achiita kuti mamorekuru eHPMC abatane pamwe chete kuti agadzire network, kuputira simende uye kusanganisa mvura. Sezvo HPMC ichigadzira network yakafanana nefirimu uye inoputira simende, ichanyatso kudzivirira kuvhuvhuta kwemvura mudhaka, uye kutadzisa kana kudzikisa hydration mwero we simende.

Kubuda ropa

Chiitiko chekubuda ropa chedhaka chakafanana neyekongiri, izvo zvinokonzeresa kugadzikana kwakakomba, zvichikonzera kuwedzera kweyero yemvura-samende yekumusoro kwe slurry, zvichikonzera kuputika kwepurasitiki huru yekumusoro kwe slurry mukutanga. dariro, uye kunyange kutsemuka, uye simba repamusoro pedenga re slurry Zvishoma zvishoma.

Kana iyo dosi iri pamusoro pe 0.5%, hapana chiitiko chekubuda ropa. Izvi zvinodaro nekuti kana HPMC yakasanganiswa mudhaka, HPMC ine firimu-inogadzira uye network chimiro, uye adsorption yemapoka ehydroxyl pane refu cheni ye macromolecules inoita kuti simende uye kusanganisa mvura mudhaka kuite flocculation, kuve nechokwadi chimiro chakagadzikana. yedhaka. Mushure mekuwedzera HPMC kune dhaka, akawanda akazvimiririra madiki mabhuru emhepo anozoumbwa. Aya mabhuru emhepo achagoverwa zvakaenzana mudhaka uye anotadzisa kuiswa kweaggregate. Kuitwa kwehunyanzvi hweHPMC kune simba guru pazvinhu zvine simende, uye inowanzo shandiswa kugadzirira zvinhu zvitsva zvesimende zvakasanganiswa senge poda yakaoma dhaka uye polymer dhaka, kuitira kuti ive nekuchengetedza mvura zvakanaka uye kuchengetedza mapurasitiki.

Kudiwa kwemvura yematope

Kana huwandu hweHPMC hudiki, hune simba guru pakuda kwemvura yedhaka. Panyaya yekuchengetedza dhigirii yekuwedzera yedhaka nyowani zvakangofanana, iyo HPMC yemukati uye kudiwa kwemvura kwevhu shanduko muhukama hwemutsara mukati meimwe nguva yenguva, uye kudiwa kwemvura kwedhaka kunotanga kuderera uyezve kuwedzera. pachena. Kana huwandu hweHPMC huri pasi pe0.025%, nekuwedzera kwehuwandu, kudiwa kwemvura kwedhaka kunoderera pasi pedhigirii rimwe chete rekuwedzera, izvo zvinoratidza kuti kana huwandu hweHPMC hushoma, hunoita kuderedza mvura dhaka, uye HPMC ine mweya-entraining maitiro. Kune huwandu hukuru hwemabhuru madiki akazvimirira emhepo mudhaka, uye aya mabhuru emhepo anoshanda semafuta ekuvandudza kuyerera kwedhaka. Kana iyo dosi yakakura kupfuura 0.025%, kudiwa kwemvura kwedhaka kunowedzera nekuwedzera kwedosi. Izvi zvinodaro nekuti iyo network yeHPMC yakawedzera kukwana, uye gaka riri pakati peiyo flocs pane refu molecular cheni inopfupiswa, iyo ine mhedzisiro yekukwezva uye kubatana, uye inoderedza fluidity yedhaka. Naizvozvo, pasi pemamiriro ekuti dhigirii rekuwedzera rakafanana, slurry inoratidza kuwedzera kwekudiwa kwemvura.

01. Kupararira kuramba bvunzo:

Anti-dispersion indekisi yakakosha yehunyanzvi yekuyera kunaka kweanopesana nekupararira mumiririri. HPMC musanganiswa wepolymer inonyungudika mumvura, inozivikanwawo seresin inonyungudika nemvura kana polima inonyungudika nemvura. Inowedzera kuwirirana kwemusanganiswa nekuwedzera viscosity yemvura inosanganiswa. Iyo hydrophilic polymer zvinhu zvinogona kunyungudika mumvura kugadzira mhinduro. kana kupararira.

Ongororo dzinoratidza kuti kana huwandu hwenaphthalene-based high-efficiency superplasticizer huchiwedzera, kuwedzerwa kwe superplasticizer kunoderedza kupararira kwekupokana kweichangobva kusanganiswa simende dhaka. Izvi zvinodaro nekuti iyo naphthalene-yakavakirwa yakakwirira-inoshanda yekuderedza mvura ndeye surfactant. Kana iyo inodzikisira mvura yawedzerwa kune dhaka, iyo inoderedza mvura inonangana pamusoro pemasimiti esimende kuita kuti pamusoro pezvikamu zvesimende zvive nechaji yakafanana. Uku kudzingwa kwemagetsi kunoita kuti simiti iite Simende chimiro che flocculation chesimenti chinoputika, uye mvura yakaputirwa muhutano inosunungurwa, izvo zvichaita kuti kurasikirwa kwechikamu chesimende. Panguva imwecheteyo, zvinowanikwa kuti nekuwedzera kweHPMC yemukati, kupararira kuramba kwedhaka resimende nyowani kuri kuita nani uye zvirinani.

02. Simba maitiro ekongiri:

Mune purojekiti yenheyo yekutyaira, HPMC yepasi pemvura isingaparadzike kongiri yakasanganiswa yakaiswa, uye giredhi resimba rekugadzira raive C25. Zvinoenderana nebvunzo yekutanga, huwandu hwesimende i400kg, iyo yakasanganiswa silica fume i25kg/m3, iyo yakakwana huwandu hweHPMC i0.6% yesamende yakawanda, mvura-simende ratio 0.42, jecha chiyero 40%, uye kubuda kwenaphthalene-based high-efficiency water reducer is Huwandu hwesimende i8%, avhareji 28d simba remuenzaniso wekongiri mumhepo ndeye 42.6MPa, iyo 28d yepakati simba rekongiri yepasi pemvura nekudonha kureba kwe60mm. mumvura ndeye 36.4MPa, uye chiyero chesimba chekongiri yakaumbwa nemvura kune kongiri yakaumbwa nemhepo i84.8%, mhedzisiro yacho inonyanya kukosha.

03. Kuedza kunoratidza:

(1) Kuwedzerwa kweHPMC kune pachena kudzoreredza mhedzisiro pamusanganiswa wedhaka. Nekuwedzera kweHPMC yemukati, nguva yekumisikidza yedhaka inowedzerwa zvakatevedzana. Pasi pezvakafanana zveHPMC, dhaka rakaumbwa pasi pemvura rinokurumidza kupfuura rakaumbwa mumhepo. Nguva yekugadzika yekuumbwa kwepakati yakareba. Izvi zvinobatsira pakupomba kongiri pasi pemvura.

(2) Iyo ichangobva kusanganiswa simende dhaka yakasanganiswa nehydroxypropyl methylcellulose ine yakanaka yakabatana zvivakwa uye inenge isina kubuda ropa.

(3) Huwandu hweHPMC uye kudiwa kwemvura kwedhaka kwakadzikira kutanga ndokuzowedzera zviri pachena.

(4) Kubatanidzwa kwemvura inoderedza mumiririri inovandudza dambudziko rekuwedzera kwemvura kudiwa kwedhaka, asi dosi rayo rinofanirwa kudzorwa zvine musoro, zvikasadaro kupararira kwepasi pemvura kuramba kwevhu rakasanganiswa simende dzimwe nguva kunoderedzwa.

(5) Pane mutsauko mudiki muchimiro pakati pesimende paste sampuli yakasanganiswa neHPMC uye isina chinhu sampuli, uye pane mutsauko mudiki muchimiro uye density yesimende paste specimen yakadururwa mumvura uye mumhepo. Muenzaniso wakaumbwa pasi pemvura kwemazuva makumi maviri nemasere wakatsvuka zvishoma. Chikonzero chikuru ndechekuti kuwedzerwa kweHPMC kunoderedza zvakanyanya kurasikirwa uye kupararira kwesementi kana ichidira mumvura, asi panguva imwechete inoderedza kuwirirana kwesementi. Mune purojekiti, pasi pemamiriro ekuona mhedzisiro yekusapararira pasi pemvura, kuyerwa kweHPMC kunofanirwa kuderedzwa zvakanyanya sezvinobvira.

(6) Kuwedzera HPMC pasi pemvura isiri-dispersible kongiri musanganiswa, kudzora dosi kunobatsira kune simba. Iyo purojekiti yekutyaira inoratidza kuti chiyero chesimba rekongiri yakaumbwa nemvura uye mhepo yakaumbwa kongiri ndeye 84.8%, uye mhedzisiro yacho yakakosha.