Desulfurization gypsum ndi chitoliro mpweya opangidwa ndi kuyaka kwa sulfure munali utsi (malasha, mafuta), mafakitale olimba zinyalala opangidwa pa desulfurization ndondomeko kuyeretsedwa, ndi hemihydrate gypsum (mankhwala chilinganizo CaSO4 · 0.5H2O), ntchito n'zofanana ndi zimenezo. gypsum yomanga zachilengedwe.Chifukwa chake, pali kafukufuku wochulukirachulukira komanso kugwiritsa ntchito gypsum ya desulfurized m'malo mwa gypsum wachilengedwe kuti apange zida zodziyimira pawokha.Organic polima admixtures monga madzi kuchepetsa wothandizila, madzi posungira wothandizila ndi retarder ndi zofunika zinchito zigawo zikuluzikulu mu zikuchokera kudzikonda leveling matope zipangizo.Kulumikizana ndi makina a awiriwa ndi zida za simenti ndizofunika kuziganizira.Chifukwa cha makhalidwe a mapangidwe ndondomeko, fineness wa gypsum desulfurized ndi yaing'ono (tinthu kukula makamaka anagawira pakati 40 ndi 60 μm), ndi gradation ufa n'zosamveka, kotero rheological zimatha desulfurized gypsum ndi osauka, ndi matope. slurry yokonzedwa ndi izo nthawi zambiri zimakhala zosavuta Kusiyanitsa, kusanja ndi kutuluka magazi.Ma cellulose ether ndi osakaniza omwe amagwiritsidwa ntchito kwambiri mumatope, ndipo kugwiritsidwa ntchito kwake pamodzi ndi wothandizira kuchepetsa madzi ndi chitsimikizo chofunikira kuti azindikire kugwira ntchito kwa zipangizo zodzikongoletsera za gypsum monga ntchito yomanga ndipo pambuyo pake makina ndi kulimba.
Mu pepalali, mtengo fluidity ntchito monga ulamuliro index (kufalikira digiri 145 mm ± 5 mm), moganizira mmene zilili mapadi efa ndi maselo kulemera (kukhuthala kwa makulidwe mtengo) pa kumwa madzi desulfurized gypsum ofotokoza kudzikonda. -leveling zipangizo, imfa ya fluidity pakapita nthawi, ndi coagulation Lamulo la chikoka cha zinthu zofunika monga nthawi ndi oyambirira makina katundu;pa nthawi yomweyo, kuyesa lamulo la chikoka cha mapadi efa pa kutentha kumasulidwa ndi kutentha kumasulidwa mlingo wa desulfurized gypsum hydration, kusanthula chikoka pa hydration ndondomeko desulfurized gypsum, ndipo poyamba kukambirana za mtundu uwu wa admixture Kugwirizana ndi desulfurization gypsum gelling dongosolo. .
1. Zopangira ndi njira zoyesera
1.1 Zopangira
Gypsum powder: desulfurized gypsum powder opangidwa ndi kampani ku Tangshan, mchere waukulu wa hemihydrate gypsum, mankhwala ake akuwonetsedwa mu Table 1, ndipo mawonekedwe ake akuwonetsedwa mu Table 2.
chithunzi
chithunzi
Zosakaniza zimaphatikizapo: cellulose ether (hydroxypropyl methylcellulose, HPMC mwachidule);superplasticizer WR;defoamer B-1;EVA redispersible latex powder S-05, zonse zomwe zilipo pamalonda.
Aggregate: mchenga wa mtsinje wachilengedwe, mchenga wodzipangira wekha wosefa ndi sieve ya 0.6 mm.
1.2 Njira yoyesera
Anakhazikika desulfurization gypsum: mchenga: madzi = 1: 0.5: 0.45, yoyenera kuchuluka kwa admixtures ena, fluidity monga ulamuliro index (kukulitsa 145 mm ± 5 mm), ndi kusintha kumwa madzi, motero wothira cementitious zipangizo (desulfurization gypsum + simenti ) 0, 0.5 ‰, 1.0 ‰, 2.0 ‰, 3.0 ‰ cellulose ether (HPMC-20,000);zina kukonza mlingo wa mapadi etere kuti 1 ‰, kusankha HPMC-20,000, HPMC-40,000 , HPMC-75,000, ndi HPMC-100,000 hydroxypropyl methylcellulose etha ndi masikelo osiyana maselo (manambala molingana ndi H70, H4 motsatana, H4, H70, H4, H70, H4, H70, H4, H4. ), kuphunzira mlingo ndi kulemera kwa maselo (kukhuthala kwamphamvu) wa cellulose etha Mphamvu ya kusintha kwa katundu wa gypsum-based self-leveling matope, ndi mphamvu ya awiriwa pa fluidity, kuika nthawi ndi katundu woyambirira wamakina. osakaniza desulfurized gypsum self-leveling matope amakambidwa.Njira yeniyeni yoyesera imachitika molingana ndi zofunikira za GB/T 17669.3-1999 "Kutsimikiza kwa Mechanical Properties of Building Gypsum".
Kutentha kwa hydration mayeso ikuchitika ntchito akusowekapo chitsanzo cha gypsum desulfurized ndi zitsanzo ndi mapadi etere zili 0,5 ‰ ndi 3 ‰, motero, ndi chida ntchito ndi TA-AIR mtundu kutentha kwa hydration tester.
2. Zotsatira ndi kusanthula
2.1 Zotsatira za cellulose ether zomwe zili pamaziko a matope
Ndi kuwonjezeka kwa zomwe zili, kugwiritsiridwa ntchito ndi kugwirizana kwa matope kumakhala bwino kwambiri, kutayika kwa madzimadzi pakapita nthawi kumachepetsedwa kwambiri, ndipo ntchito yomangamanga imakhala yabwino kwambiri, ndipo matope olimba alibe chodabwitsa cha delamination, ndi kusalala kwa pamwamba, kusalala ndi Aesthetics akhala bwino kwambiri.Panthawi imodzimodziyo, kumwa madzi a matope kuti akwaniritse madzi omwewo akuwonjezeka kwambiri.Pa 5 ‰, kumwa madzi kunawonjezeka ndi 102%, ndipo nthawi yomaliza yoikika inatalikitsidwa ndi 100 min, yomwe inali nthawi 2.5 ya chitsanzo chopanda kanthu.Zoyamba zamakina zamakina zamatope zidachepa kwambiri ndi kuchuluka kwa zomwe zili mu cellulose ether.Pamene zili pa cellulose ether anali 5‰, 24 h flexural mphamvu ndi compressive mphamvu unachepa kwa 18,75% ndi 11.29% ya akusowekapo zitsanzo motero.Mphamvu yopondereza ndi 39.47% ndi 23.45% ya zitsanzo zopanda kanthu motsatana.Ndikoyenera kudziwa kuti ndi kuwonjezeka kwa kuchuluka kwa madzi osungira madzi, kuchuluka kwa matope kunachepanso kwambiri, kuchokera ku 2069 kg / m3 pa 0 mpaka 1747 kg / m3 pa 5 ‰, kuchepa kwa 15.56%.The kachulukidwe matope amachepetsa ndipo porosity ukuwonjezeka, chomwe ndi chimodzi mwa zifukwa zoonekeratu kuchepa kwa makina katundu matope.
Cellulose ether ndi polima yopanda ionic.Magulu a hydroxyl pa unyolo wa cellulose ether ndi maatomu a okosijeni pa chomangira cha ether amatha kuphatikiza ndi mamolekyu amadzi kuti apange zomangira za haidrojeni, kutembenuza madzi aulere kukhala madzi omangika, potero amathandizira kusunga madzi.Macroscopically Imawonetseredwa ngati kuwonjezeka kwa mgwirizano wa slurry [5].Kuwonjezeka slurry mamasukidwe akayendedwe osati kuonjezera kumwa madzi, komanso kusungunuka mapadi efa adzakhala adsorbed padziko gypsum particles, kulepheretsa hydration anachita ndi kutalikitsa atakhala nthawi;pa nthawi yoyambitsanso, kuchuluka kwa thovu la mpweya kudzayambitsidwanso.Voids idzapanga pamene matope amauma, pamapeto pake amachepetsa mphamvu ya matope.Mokwanira kuganizira unilateral madzi kumwa matope osakaniza, ntchito yomanga, kuika nthawi ndi mawotchi katundu, ndipo kenako durability, etc., zili mapadi etere mu desulfurized gypsum ofotokoza kudziona kusanja matope sayenera upambana 1 ‰.
2.2 Zotsatira za kulemera kwa maselo a cellulose ether pakugwira ntchito kwa matope
Nthawi zambiri, kukwezeka kwa mamachulukidwe komanso kukongola kwa cellulose ether, kumapangitsa kuti madzi asungidwe bwino ndikuwonjezera mphamvu yolumikizana.magwiridwe antchito adzakhudzidwa moyipa.Chifukwa chake, chikoka cha ma cellulose ethers a masikelo osiyanasiyana a mamolekyu pa zinthu zoyambira za gypsum-based self-leveling matope zida zidayesedwanso.Kufunika kwa madzi kwa matope kunakula mpaka kufika pamlingo wina, koma kunalibe zotsatira zoonekeratu pa nthawi yokhazikitsa ndi madzimadzi.Pa nthawi yomweyo, flexural ndi compressive mphamvu za matope m'mayiko osiyanasiyana anasonyeza mchitidwe pansi, koma kutsika kunali kochepa kwambiri kuposa chikoka cha mapadi ether zili pa makina katundu.Mwachidule, kuwonjezeka kwa kulemera kwa maselo a cellulose ether sikukhala ndi zotsatira zoonekeratu pakuchita kwa matope osakaniza.Poganizira zosavuta zomanga, otsika mamasukidwe akayendedwe ndi ang'onoang'ono maselo kulemera cellulose ether ayenera kusankhidwa monga desulfurized gypsum-based self-leveling zipangizo.
2.3 Mphamvu ya cellulose ether pa kutentha kwa hydration ya gypsum desulfurized
Ndi kuwonjezeka kwa zili mapadi efa, ndi exothermic pachimake cha hydration desulfurized gypsum pang`onopang`ono utachepa, ndi nthawi ya pachimake udindo anali pang`ono anachedwa, pamene kutentha exothermic wa hydration utachepa, koma osati mwachionekere.Izi zikuwonetsa kuti ether ya cellulose imatha kuchedwetsa kuchuluka kwa hydration ndi digiri ya hydration ya gypsum desulfurized mpaka pamlingo wina, kotero kuti mlingowo usakhale waukulu kwambiri, ndipo uyenera kuwongoleredwa mkati mwa 1 ‰.Tingaone kuti colloidal filimu anapanga pambuyo mapanelo etha akukumana madzi ndi adsorbed padziko desulfurized gypsum particles, amene amachepetsa hydration mlingo wa gypsum pamaso 2 h.Panthawi imodzimodziyo, kusunga kwake kwapadera kwa madzi ndi kukhuthala kwake kumachedwetsa kutuluka kwa madzi a slurry ndipo Dissipation imakhala yopindulitsa ku hydration ya desulfurized gypsum pambuyo pake.Mwachidule, pamene mlingo woyenerera umayendetsedwa, cellulose ether ali ndi mphamvu zochepa pa mlingo wa hydration ndi hydration digiri ya gypsum desulfurized palokha.Panthawi imodzimodziyo, kuwonjezeka kwa cellulose ether okhutira ndi kulemera kwa maselo kudzawonjezera kwambiri kukhuthala kwa slurry ndikuwonetsa ntchito yabwino yosungira madzi.Pofuna kuonetsetsa kuti madzi amadzimadzi amadzimadzi a desulfurized gypsum, kumwa madzi kudzawonjezeka kwambiri, zomwe zimachitika chifukwa cha nthawi yayitali ya matope.Chifukwa chachikulu cha kuchepa kwa zinthu zamakina.
3. Mapeto
(1) Pamene fluidity ntchito monga ulamuliro index, ndi kuchuluka kwa mapadi etere okhutira, kuika nthawi ya desulfurized gypsum ofotokoza kudziletsa kusanjikiza matope ndi yaitali kwambiri, ndi mawotchi katundu kwambiri yafupika;poyerekeza ndi zomwe zili, kulemera kwa maselo a cellulose ether Kuwonjezeka kuli ndi zotsatira zochepa pazomwe zili pamwambazi zamatope.Poganizira mozama, ma cellulose ether ayenera kusankhidwa ndi kachulukidwe kakang'ono ka molekyulu (kukhuthala kwamtengo wotsika kuposa 20 000 Pa · s), ndipo mlingo uyenera kuyendetsedwa mkati mwa 1 ‰ ya zinthu za simenti.
(2) The mayeso zotsatira za kutentha hydration wa gypsum desulfurized zimasonyeza kuti mkati mwa kuchuluka kwa mayeso, mapadi etere ali ndi mphamvu zochepa pa mlingo hydration ndi hydration ndondomeko desulfurized gypsum.Kuwonjezeka kwa kumwa madzi ndi kuchepa kwa kachulukidwe kochulukira ndizifukwa zazikulu za kuchepa kwa mawotchi opangidwa ndi matope a desulfurized gypsum.
Nthawi yotumiza: May-08-2023