Udindo wa HPMC pakuwongolera magwiridwe antchito a simenti

Simenti ndi imodzi mwazinthu zomangira zomwe zimagwiritsidwa ntchito kwambiri pantchito yomanga, ndipo kugwirira ntchito kwa simenti ndichinthu chofunikira kwambiri chomwe chimakhudza kapangidwe kake, kachitidwe komanso kamangidwe komaliza. Pofuna kupititsa patsogolo ntchito ya simenti, zosakaniza zosiyanasiyana nthawi zambiri zimawonjezeredwa ku simenti. Mwa iwo,hydroxypropyl methylcellulose (HPMC), monga chosakaniza cha simenti chomwe chimagwiritsidwa ntchito kwambiri, chimakhala ndi gawo lalikulu.

(1) Zinthu zoyambira za HPMC

HPMC (Hydroxypropyl Methylcellulose)ndi polima osungunuka m'madzi omwe amagwiritsidwa ntchito kwambiri pomanga, zokutira, mankhwala, chakudya ndi mafakitale ena. Mu simenti, HPMC nthawi zambiri imagwiritsidwa ntchito ngati chokhuthala, chosungira madzi ndi rheology modifier kuti apititse patsogolo kusungunuka kwa simenti, kuchedwetsa kuyika koyamba kwa simenti ndikuwongolera magwiridwe antchito a simenti. Kupyolera mu mawonekedwe ake apadera a maselo, HPMC imatha kuyanjana ndi mamolekyu amadzi ndi tinthu tating'onoting'ono mu slurry ya simenti, potero kupititsa patsogolo ntchito ya simenti.

(2) Zotsatira za HPMC pakupanga simenti

Kugwira ntchito kwa simenti kumaphatikizapo zinthu zambiri, zomwe zimakhala zovuta kwambiri, zomwe zimakhala ndi madzi, ductility ndi ntchito ya slurry ya simenti panthawi yomanga. HPMC akhoza kwambiri kusintha workability wa simenti mbali zambiri.

1. Sinthani madzimadzi a simenti slurry

Kuchuluka kwa simenti kumatanthawuza kuthekera kwa phala la simenti kuyenda momasuka pakumanga. Simenti slurry yokhala ndi madzi ocheperako imayambitsa zovuta monga kuvutikira kusakaniza ndikugwiritsa ntchito mosagwirizana pakumanga, zomwe zingakhudze ntchito yomanga ndi zotsatira zake. HPMC ali kwambiri thickening katundu ndi bwino kuonjezera mamasukidwe akayendedwe a simenti slurry. Mapangidwe ake a unyolo wa ma cell amatha kuyanjana ndi mamolekyu amadzi ndi tinthu tating'ono ta simenti kuti apange mawonekedwe owoneka bwino kwambiri, potero kumapangitsa kuti slurry ikhale yamadzimadzi.

Ndi kusintha kuchuluka kwa HPMC anawonjezera, ndi fluidity wa slurry simenti akhoza flexibly ankalamulira, amene sangakhoze kusintha fluidity, komanso kupewa slurry kulekana ndi kukhazikika chifukwa cha otaya kwambiri. Choncho, kugwiritsa ntchito HPMC kungathandize kupeza slurry yokhazikika komanso yofanana panthawi yomanga simenti, potero kuonetsetsa kuti zomangamanga zili bwino.

2. Kuchedwetsa nthawi yoyamba yoyika simenti

Nthawi yoyamba yoyika simenti imatanthawuza nthawi yomwe simenti imayamba kuuma. Ngati nthawi yoikika yoyamba ndi yochepa kwambiri, idzapangitsa kuti simenti ikhale yovuta kugwira ntchito panthawi yomanga ndikukhudza khalidwe la zomangamanga; ngati nthawi yoyika koyamba ndi yayitali kwambiri, imatha kuwononga madzi komanso kuchepetsa mphamvu ya simenti. Monga chowonjezera komanso chosungira madzi, HPMC imatha kuchedwetsa njira ya hydration ya simenti mwa kuphatikiza ndi chinyezi mu slurry ya simenti, potero ikukulitsa nthawi yoyambira. Poyang'anira kuchuluka kwa HPMC yowonjezeredwa, nthawi yoyamba yoyika slurry ya simenti ikhoza kusinthidwa molondola kuti zitsimikizire kuti simenti ikugwira ntchito mokwanira panthawi yomanga.

3. Kupititsa patsogolo kasungidwe ka madzi a simenti

Simenti imayenera kusunga chinyezi pang'ono panthawi yomanga kuti zitsimikizire kuti hydration reaction yake ikuyenda bwino. Pamene madzi osungira simenti ndi osauka, madzi amasanduka nthunzi mofulumira, kubweretsa mavuto monga ming'alu ndi kuchepetsa mphamvu ya simenti phala. Monga polima pawiri, HPMC akhoza kupanga "hydrogel"-monga maukonde dongosolo simenti slurry kuti mwamphamvu kukonza madzi mu slurry, potero bwino bwino kusungitsa madzi posungira simenti. Ngakhale kuti kusungirako madzi kumakhala bwino, slurry ya simenti imakhala yokhazikika panthawi yomanga, kuchepetsa kuchitika kwa simenti, ming'alu ndi mavuto ena.

4. Sinthani rheology ya simenti phala

Rheology imatanthawuza mawonekedwe a zinthu zomwe zimapunduka pansi pa kupsinjika, zomwe nthawi zambiri zimaphatikiza kukhuthala, madzimadzi, ndi zina zambiri.Mtengo wa HPMCamasintha rheological katundu wa simenti slurry kuti slurry ndi bwino fluidity ndi kutsika otaya kukana. Izi sikuti zimathandiza kusintha workability ndi ❖ kuyanika zotsatira za simenti, komanso kumathandiza kuchepetsa zida zotayika chifukwa kwambiri mamasukidwe akayendedwe a slurry pa ntchito yomanga.

5. Limbikitsani kukana kwa simenti kwa ming'alu

Kuphatikizika kwa HPMC kumatha kupititsa patsogolo mphamvu zomangira komanso kukana kwa simenti. Simenti itatha kuuma, mawonekedwe a fibrous opangidwa ndi HPMC amatha kuchepetsa ming'alu yomwe imayamba chifukwa cha zinthu monga kuyanika kwakuya ndi kusintha kwa kutentha kwa simentiyo mpaka kufika pamlingo wina, potero kumapangitsa kuti simenti ikhale yolimba. Makamaka pomanga m'malo ovuta monga kutentha kwambiri komanso chinyezi chambiri, kugwiritsa ntchito HPMC kumatha kuchepetsa kwambiri ming'alu, potero kumapangitsa kuti mapangidwewo akhale abwino.

(3) Zitsanzo zogwiritsira ntchito HPMC mu simenti

Dothi louma: HPMC imagwiritsidwa ntchito kwambiri mumatope owuma. Ikhoza kupititsa patsogolo ntchito ya matope, kuonjezera kusunga madzi ndikuchedwetsa nthawi yoyambira. Pazinthu zomangira monga zokutira kunja kwa khoma, zomatira matailosi, ndi matope opaka pulasitala, kuchuluka kwa HPMC komwe kumawonjezeredwa nthawi zambiri kumakhala pakati pa 0.1% ndi 0.3%. Ikhoza kuonetsetsa kuti matope sakhala ophweka kuti aume panthawi yomanga ndikuonetsetsa kuti zomangamanga bwino.

Simenti yodziyimira pawokha: Simenti yodziyimira pawokha ndi chinthu cha simenti chokhala ndi madzi abwino kwambiri komanso kudzaza. Nthawi zambiri amagwiritsidwa ntchito pokonza nthaka, kukonza ndi ntchito zina. Monga chowonjezera komanso chosungira madzi, HPMC imatha kupititsa patsogolo rheology ya simenti yodziyimira pawokha, kuti ikhale yosavuta kugwira ntchito komanso yunifolomu pakumanga.

Kukonza simenti: Pakati pa zipangizo zokonzetsera simenti, HPMC ikhoza kupititsa patsogolo kumamatira ndi kukhazikika kwa zinthuzo, kulepheretsa kuti zinthuzo zisaume mofulumira ndikuwonjezera ntchito yokonza zinthu.

Monga chophatikizira chofunikira cha simenti, HPMC imapangitsa kuti simenti igwire bwino ntchito komanso imapangitsa kuti ntchito yomanga ikhale yogwira mtima komanso ntchito yabwino kudzera muntchito zingapo monga kukhuthala, kusunga madzi, komanso kuchedwetsa kuyika. Kugwiritsiridwa ntchito kwake mu phala la simenti sikumangowonjezera madzi komanso kumawonjezera nthawi yokonzekera, komanso kumawonjezera kusungirako madzi, kukana ming'alu ndi rheological properties. Pamene makampani omanga akupitirizabe kukonza zofunikira pa zomangamanga ndi bwino, HPMC, monga chowonjezera pazachuma komanso chilengedwe, idzagwiritsidwa ntchito kwambiri mu simenti ndi zipangizo zina zomangira.