Self-Compacting Concrete (SCC) ndiukadaulo wamakono wa konkriti womwe umayenda pansi pa kulemera kwake kuti mudzaze formwork popanda kufunikira kwa kugwedezeka kwamakina.Ubwino wake ndi kukhathamiritsa kwa magwiridwe antchito, kutsika mtengo kwa ogwira ntchito, komanso kuwongolera magwiridwe antchito.Kukwaniritsa izi kumafuna kuwongolera bwino kusakaniza, nthawi zambiri mothandizidwa ndi zosakaniza monga Hydroxypropyl Methylcellulose (HPMC).Polima iyi ya cellulose ether imagwira ntchito yofunika kwambiri posintha mawonekedwe a SCC, kuwongolera kukhazikika kwake komanso mawonekedwe ake oyenda.
Katundu ndi Ntchito za HPMC
Hydroxypropyl Methylcellulose (HPMC) ndi polima yopanda ionic, yosungunuka m'madzi yochokera ku cellulose.Zofunika zake ndi izi:
Kusinthika kwa Viscosity: HPMC imawonjezera kukhuthala kwa njira zamadzimadzi, kukulitsa chikhalidwe cha thixotropic cha kusakaniza konkire.
Kusunga Madzi: Ili ndi mphamvu zosunga madzi bwino, zomwe zimathandiza kuti konkire isagwire ntchito pochepetsa kutuluka kwa madzi.
Kugwirizana ndi Kugwirizana: HPMC imapangitsa mgwirizano pakati pa magawo osiyanasiyana mu konkire, kupititsa patsogolo machitidwe ake ogwirizana.
Kupititsa patsogolo Kukhazikika: Zimakhazikitsa kuyimitsidwa kwamagulu osakanikirana, kuchepetsa kulekanitsa ndi kutuluka magazi.
Katunduwa amapangitsa HPMC kukhala chowonjezera chofunikira mu SCC, chifukwa imalimbana ndi zovuta zomwe zimachitika nthawi zambiri monga tsankho, kutuluka magazi, komanso kusunga kuyenda komwe kumafunikira popanda kusokoneza bata.
Udindo wa HPMC mu Self-Compacting Concrete
1. Kupititsa patsogolo Kugwira Ntchito
Ntchito yayikulu ya HPMC mu SCC ndikukulitsa magwiridwe antchito ake powonjezera kukhuthala kwa kusakaniza.Kusintha kumeneku kumapangitsa SCC kuyenda mosavuta pansi pa kulemera kwake, kudzaza mawonekedwe ovuta ndikukwaniritsa kuphatikizika kwakukulu popanda kufunikira kwa kugwedezeka.HPMC imawonetsetsa kuti konkire imakhalabe yogwira ntchito kwa nthawi yayitali, yomwe imakhala yopindulitsa kwambiri pakuthira kwakukulu kapena zovuta.
Flowability: HPMC imathandizira kusakaniza kwa thixotropic katundu, kulola kuti ikhalebe yamadzimadzi ikasakanizidwa koma kunenepa pakuyima.Khalidweli limathandizira kudziyimira pawokha kwa SCC, kuwonetsetsa kuti ikuyenda bwino kuti mudzaze nkhungu ndikuyika mipiringidzo yolimbitsa popanda tsankho.
Kusasinthasintha: Poyang'anira kukhuthala, HPMC imathandiza kusunga yunifolomu nthawi yonse yosakanikirana, kuonetsetsa kuti gulu lililonse la SCC likuwonetsa ntchito zosagwirizana ndi kuyenda ndi kukhazikika.
2. Kulekanitsa ndi Kuletsa Kutulutsa Magazi
Kusiyanitsa (kulekanitsidwa kwa zophatikizika ndi phala la simenti) ndi kutuluka magazi (madzi akukwera pamwamba) ndizofunikira kwambiri mu SCC.Zochitika izi zimatha kusokoneza kukhulupirika kwapangidwe komanso kutha kwa konkire.
Homogeneous Mix: Kutha kwa HPMC kukulitsa kukhuthala kwa phala la simenti kumachepetsa kusuntha kwamadzi ndi magulu, potero kuchepetsa chiopsezo cha tsankho.
Kukhetsa Magazi: Posunga madzi mkati mwa kusakaniza, HPMC imathandiza kupewa kutaya magazi.Kusungidwa kwamadzi kumeneku kumatsimikiziranso kuti njira ya hydration ikupitirizabe bwino, kupititsa patsogolo chitukuko cha mphamvu ndi kukhazikika kwa konkire.
3. Kukhazikika Kukhazikika
HPMC imathandizira kukhazikika kwa SCC mwa kukonza mgwirizano pakati pa tinthu tating'onoting'ono.Kukhazikika kokhazikika kumeneku ndikofunikira pakusungitsa kugawa kofanana kwa magulu ndikuletsa kupangika kwa void kapena malo ofooka.
Kugwirizana: Kuphatikizika kwa HPMC kumalimbikitsa mgwirizano wabwino pakati pa tinthu tating'ono ta simenti ndi zophatikizika, zomwe zimapangitsa kuti pakhale kusakaniza kogwirizana komwe kumatsutsa tsankho.
Kukhazikika: HPMC imakhazikitsa ma microstructure a konkire, kulola kuti ngakhale kugawidwa kwa magulu ndi kuteteza mapangidwe a laitance (wosanjikiza wofooka wa simenti ndi particles zabwino pamwamba).
Zotsatira pa Mechanical Properties
1. Compressive Mphamvu
Mphamvu ya HPMC pa mphamvu yopondereza ya SCC nthawi zambiri imakhala yabwino.Poletsa tsankho ndikuwonetsetsa kusakanikirana kofanana, HPMC imathandiza kusunga umphumphu wa microstructure ya konkire, zomwe zimatsogolera ku makhalidwe abwino a mphamvu.
Hydration: Kusungidwa kwamadzi kowonjezereka kumapangitsa kuti tinthu tating'ono ta simenti tizikhala bwino, zomwe zimathandizira kupanga matrix amphamvu.
Uniform Density: Kupewa kwa tsankho kumapangitsa kuti pakhale kugawa kofanana kwa magulu, omwe amathandizira kulimba kwamphamvu komanso kumachepetsa chiopsezo cha zofooka.
2. Kukhalitsa
Kugwiritsa ntchito HPMC mu SCC kumakulitsa kulimba kwake poonetsetsa kuti pali cholimba komanso chofanana kwambiri.
Kuchepetsa Kuthekera: Kulumikizana bwino komanso kuchepa kwa magazi kumachepetsa kupenya kwa konkriti, kumapangitsa kuti konkriti isavutike ndi zinthu zachilengedwe monga kuzizira, kuwononga mankhwala, ndi carbonation.
Kutsirizitsa Pamwamba Pamwamba: Kupewa kukhetsa magazi ndi kulekanitsa kumatsimikizira kuti pamwamba pake pamakhala chosalala komanso chokhazikika, chomwe sichimakonda kusweka ndi makulitsidwe.
Kugwiritsa Ntchito ndi Mlingo
Kuchita bwino kwa HPMC mu SCC kumadalira mlingo wake ndi zofunikira zenizeni za kusakaniza.Miyezo yodziwika bwino ya mlingo imachokera ku 0,1% mpaka 0,5% ya kulemera kwa simenti, malingana ndi katundu wofunidwa ndi makhalidwe a zigawo zina mu kusakaniza.
Mix Design: Kukonzekera kosakaniza kosamala ndikofunikira kuti mukwaniritse zabwino za HPMC.Zinthu monga mtundu wa aggregate, zomwe zili ndi simenti, ndi zosakaniza zina ziyenera kuganiziridwa kuti zitheke kukwaniritsa magwiridwe antchito, kukhazikika, ndi mphamvu.
Kugwirizana: HPMC iyenera kukhala yogwirizana ndi zosakaniza zina zomwe zimagwiritsidwa ntchito posakaniza, monga superplasticizers ndi zochepetsera madzi, kupewa kuyanjana koyipa komwe kungasokoneze ntchito ya SCC.
Hydroxypropyl Methylcellulose (HPMC) imagwira ntchito yofunika kwambiri popititsa patsogolo ntchito ya Self-Compacting Concrete (SCC).Kuthekera kwake kusintha mamasukidwe akayendedwe, kukonza kusungika kwa madzi, ndikukhazikika kusakanikirana kumalimbana ndi zovuta zazikulu pakupanga kwa SCC, kuphatikiza kusankhana, kutuluka magazi, komanso kusunga kuyenda.Kuphatikizika kwa HPMC mu SCC kumapangitsa kuti konkriti ikhale yogwira ntchito, yokhazikika, komanso yokhazikika, zomwe zimapangitsa kuti ikhale chowonjezera chofunikira pakugwiritsa ntchito konkriti zamakono.Mulingo woyenera komanso kapangidwe kakusakaniza ndikofunikira kuti mugwiritse ntchito phindu lonse la HPMC, kuwonetsetsa kuti SCC ikukwaniritsa zofunikira pazantchito zosiyanasiyana zomanga.
Nthawi yotumiza: Jun-18-2024