Kusintha kwa hydroxypropyl methylcellulose (HPMC) pazida zopangira simenti

M'zaka zaposachedwa, ndi chitukuko mosalekeza wa kunja luso kutchinjiriza khoma, kupita patsogolo mosalekeza luso kupanga mapadi, ndi makhalidwe abwino a HPMC palokha, HPMC wakhala chimagwiritsidwa ntchito makampani zomangamanga.

Kuti mupitirize kufufuza momwe zimagwirira ntchito pakati pa hydroxypropyl methylcellulose (HPMC) ndi zipangizo zopangira simenti, pepala ili likuyang'ana pa kusintha kwa Jinshuiqiao hydroxypropyl methylcellulose (HPMC) pamagulu ogwirizana a zipangizo za simenti.

nthawi ya clotting

Kuyika nthawi ya konkire makamaka yokhudzana ndi nthawi yoyika simenti, ndipo kuphatikizikako kumakhala ndi mphamvu zochepa, kotero nthawi yoyika matope ingagwiritsidwe ntchito m'malo mwake kuti iphunzire kukhudzidwa kwa HPMC pa nthawi yokhazikika ya madzi osakanikirana osabalalika a konkire, chifukwa nthawi yoyika matope imakhudzidwa ndi madzi Choncho, pofuna kuyesa mphamvu ya HPMC pa nthawi yoyika matope, m'pofunika kukonza chiŵerengero cha simenti ya madzi ndi chiŵerengero cha matope a matope.

Malinga ndi kuyesako, kuwonjezera kwa HPMC kumakhala ndi vuto lalikulu pakusakaniza kwamatope, ndipo nthawi yoyika matope imatalika motsatizana ndi kuchuluka kwa zomwe zili mu HPMC. Pansi pa zomwe zili mu HPMC, matope opangidwa pansi pamadzi amathamanga kuposa matope opangidwa mumlengalenga. Nthawi yoikika yakuumba sing'anga ndi yayitali. Mukayezedwa m'madzi, poyerekeza ndi chitsanzo chopanda kanthu, nthawi yoyika matope osakanikirana ndi HPMC imachedwa ndi maola 6-18 kuti ikhale yoyamba ndi maola 6-22 kuti ikhale yomaliza. Choncho, HPMC ayenera kugwiritsidwa ntchito osakaniza accelerators.

HPMC ndi mkulu-maselo polima ndi macromolecular liniya dongosolo ndi gulu hydroxyl pa zinchito gulu, amene akhoza kupanga hydrogen zomangira ndi kusakaniza madzi mamolekyu ndi kuonjezera mamasukidwe akayendedwe a kusakaniza madzi. Unyolo wautali wa mamolekyulu a HPMC udzakopana wina ndi mzake, ndikupanga mamolekyu a HPMC kuti agwirizane kuti apange maukonde, kukulunga simenti ndi kusakaniza madzi. Popeza HPMC imapanga maukonde dongosolo ofanana filimu ndi kukulunga simenti, izo bwino kuteteza volatilization madzi mu matope, ndi kulepheretsa kapena kuchepetsa mlingo wa hydration wa simenti.

Kutuluka magazi

Kukhetsa magazi kwa matope ndi kofanana ndi konkire, komwe kungayambitse kukhazikika kwakukulu, zomwe zimapangitsa kuti chiŵerengero cha madzi-simenti chiwonjezeke pamwamba pa slurry, zomwe zimapangitsa kuti pulasitiki ikhale yochuluka kwambiri ya slurry kumayambiriro. siteji, ndipo ngakhale akulimbana, ndi mphamvu ya pamwamba wosanjikiza wa slurry Ndi ofooka.

Mlingo ukakhala pamwamba pa 0,5%, palibe chomwe chimatuluka magazi. Izi ndichifukwa choti HPMC ikasakanizidwa mumatope, HPMC ili ndi mawonekedwe opangira filimu ndi maukonde, ndipo kutsatsa kwamagulu a hydroxyl pa unyolo wautali wa macromolecules kumapangitsa simenti ndi kusakaniza madzi mumtondo kukhala flocculation, kuonetsetsa dongosolo lokhazikika. wa matope. Mukawonjezera HPMC mumatope, tinthu tating'ono tating'ono tating'ono tating'ono timapangidwa. Ma thovu a mpweya awa adzagawidwa mofanana mumatope ndikulepheretsa kuyika kwa aggregate. Katswiri waukadaulo wa HPMC amakhudza kwambiri zinthu zopangidwa ndi simenti, ndipo nthawi zambiri amagwiritsidwa ntchito popanga zida zatsopano zopangira simenti monga matope a ufa wouma ndi matope a polima, kuti azikhala ndi madzi abwino komanso kusunga pulasitiki.

Kufuna madzi amatope

Pamene kuchuluka kwa HPMC ndi kochepa, kumakhala ndi chikoka chachikulu pa kufunikira kwa madzi mumatope. Pankhani yosunga kuchuluka kwa matope atsopano kukhala ofanana, zomwe HPMC zili ndi kuchuluka kwamadzi pakusintha kwamatope muubwenzi wolumikizana mkati mwa nthawi inayake, ndipo kufunikira kwamadzi kwamatope kumayamba kuchepa kenako kumawonjezeka. mwachiwonekere. Pamene kuchuluka kwa HPMC ndi zosakwana 0.025%, ndi kuchuluka kwa kuchuluka, kufunikira kwa madzi a matope kumachepa pansi pa mlingo womwewo wowonjezera, zomwe zimasonyeza kuti pamene kuchuluka kwa HPMC kuli kochepa, kumakhala ndi mphamvu yochepetsera madzi matope, ndipo HPMC ili ndi mphamvu yolowera mpweya. Pali timbiri ting'onoting'ono tating'ono ta mpweya tomwe timadziyimira pawokha mumatope, ndipo tinthu tating'onoting'ono ta mpweya timakhala ngati mafuta opangira matope kuti azitha kutulutsa madzi. Mlingo ukakhala waukulu kuposa 0.025%, kufunikira kwamadzi pamatope kumawonjezeka ndikuwonjezeka kwa mlingo. Izi ndichifukwa choti mawonekedwe a maukonde a HPMC amathanso kutha, ndipo kusiyana pakati pa flocs pa unyolo wautali wama cell kumafupikitsidwa, komwe kumakhala ndi zotsatira za kukopa ndi kulumikizana, komanso kumachepetsa kutulutsa kwamatope. Choncho, pansi pa chikhalidwe chakuti kuchuluka kwa kukulitsa kumakhala kofanana, slurry imasonyeza kuwonjezeka kwa madzi.

01. Kuyesa kukana kufalikira:

Anti-dispersion ndi ndondomeko yofunikira yaukadaulo yoyezera mtundu wa anti-dispersion agent. HPMC ndi madzi sungunuka polima pawiri, amadziwikanso kuti madzi sungunuka utomoni kapena madzi sungunuka polima. Zimawonjezera kusakanikirana kwa kusakaniza mwa kuwonjezera kukhuthala kwa madzi osakaniza. Ndi hydrophilic polima zakuthupi zomwe zimatha kusungunuka m'madzi kupanga yankho. kapena kubalalitsidwa.

Mayesero amasonyeza kuti pamene kuchuluka kwa naphthalene-based high-efficiency superplasticizer kumawonjezeka, kuwonjezera kwa superplasticizer kumachepetsa kukana kwa kubalalitsidwa kwamatope atsopano osakanikirana a simenti. Izi zili choncho chifukwa chochepetsera madzi cha naphthalene chokhazikika kwambiri ndi chopanda madzi. Pamene chochepetsera madzi chikuwonjezeredwa kumatope, chochepetsera madzi chidzayang'ana pamwamba pa zidutswa za simenti kuti pamwamba pazitsulo za simenti zikhale ndi malipiro ofanana. Kuthamangitsidwa kwamagetsi kumeneku kumapangitsa kuti tinthu tating'onoting'ono tipange Simentiyo Mapangidwe a flocculation a simenti amachotsedwa, ndipo madzi atakulungidwa mu dongosololi amamasulidwa, zomwe zidzachititsa kuti gawo la simenti liwonongeke. Nthawi yomweyo, zimapezeka kuti pakuwonjezeka kwa zinthu za HPMC, kukana kwamwala kwa matope atsopano a simenti kumakhala bwinoko.

02. Makhalidwe amphamvu a konkire:

Mu ntchito yoyendetsa maziko, HPMC yosakanizika konkriti ya pansi pamadzi yosabalalika idagwiritsidwa ntchito, ndipo kalasi yamphamvu yamapangidwe inali C25. Malinga ndi mayeso oyambira, kuchuluka kwa simenti ndi 400kg, utsi wophatikizana wa silika ndi 25kg/m3, mulingo woyenera wa HPMC ndi 0,6% ya simenti, chiŵerengero cha simenti ndi 0,42, mchenga ndi 40%, ndi kutulutsa kwa naphthalene-based high-efficiency water reducer Kuchuluka kwa simenti ndi 8%, mphamvu yapakati pa 28d ya chitsanzo cha konkire mumlengalenga ndi 42.6MPa, mphamvu ya 28d ya konkire ya pansi pa madzi ndi kutalika kwa 60mm m'madzi ndi 36.4MPa, ndipo chiŵerengero cha mphamvu ya konkire yopangidwa ndi madzi ku konkire yopangidwa ndi mpweya ndi 84.8%, zotsatira zake ndizofunika kwambiri.

03. Zoyeserera zikuwonetsa:

(1) Kuphatikizidwa kwa HPMC kumakhala ndi zotsatira zowoneka bwino pakusakaniza kwamatope. Ndi kuchuluka kwa zomwe zili mu HPMC, nthawi yoyika matope imakulitsidwa motsatizana. Pansi pa zomwe zili mu HPMC, matope opangidwa pansi pa madzi ndi othamanga kuposa omwe amapangidwa mumlengalenga. Nthawi yoikika yakuumba sing'anga ndi yayitali. Mbaliyi ndi yopindulitsa popopera konkire pansi pa madzi.

(2) Tondo la simenti lomwe wangosakaniza kumene ndi hydroxypropyl methylcellulose lili ndi zinthu zolumikizana bwino ndipo sizimatuluka magazi.

(3) Kuchuluka kwa HPMC ndi kufunikira kwa madzi kwa matope kunatsika poyamba ndikuwonjezeka mwachiwonekere.

(4) Kuphatikizika kwa chinthu chochepetsera madzi kumawongolera vuto la kuchuluka kwa madzi ofunikira pamatope, koma mlingo wake uyenera kuyendetsedwa moyenera, apo ayi kukana kwa madzi apansi pamadzi amatope osakanikirana a simenti nthawi zina kuchepetsedwa.

(5) Pali kusiyana pang'ono pamapangidwe pakati pa phala la simenti losakanizidwa ndi HPMC ndi chitsanzo chopanda kanthu, ndipo pali kusiyana pang'ono mu kapangidwe ndi kachulukidwe ka chitsanzo cha phala la simenti chotsanuliridwa m'madzi ndi mpweya. Chitsanzo chopangidwa pansi pa madzi kwa masiku 28 chimakhala chowoneka bwino. Chifukwa chachikulu ndi chakuti kuwonjezera kwa HPMC kumachepetsa kwambiri kutaya ndi kubalalitsidwa kwa simenti pamene kuthira m'madzi, koma nthawi yomweyo kumachepetsa kugwirizanitsa kwa simenti. Mu pulojekitiyi, pansi pa chikhalidwe chowonetsetsa zotsatira za kusabalalika pansi pa madzi, mlingo wa HPMC uyenera kuchepetsedwa momwe zingathere.

(6) Powonjezera HPMC pansi pa madzi osakaniza konkire sanali dispersible, kulamulira mlingo n'kopindulitsa kwa mphamvu. Ntchito yoyendetsa ndegeyo ikuwonetsa kuti chiŵerengero cha mphamvu za konkire yopangidwa ndi madzi ndi konkire yopangidwa ndi mpweya ndi 84.8%, ndipo zotsatira zake ndizofunika kwambiri.