Nthawi zambiri, kukhathamira kwamphamvu kumapangitsa kuti matope a gypsum asungidwe bwino. Komabe, kukhathamiritsa kwamphamvu kwambiri, kuchuluka kwa maselo a cellulose ether, komanso kutsika kofananirako kusungunuka kwake kudzakhala ndi vuto lalikulu pa mphamvu ndi ntchito yomanga ya matope. The apamwamba mamasukidwe akayendedwe, ndi zoonekeratu kwambiri thickening zotsatira pa matope, koma si mwachindunji molingana.
Kukwezeka kwa viscosity, m'pamenenso matope onyowa amawonekera kwambiri. Pakumanga, zimawonetsedwa ngati kumamatira ku scraper ndi kumamatira kwakukulu ku gawo lapansi. Koma sizothandiza kuwonjezera mphamvu zamapangidwe a dothi lonyowa palokha. Kuonjezera apo, panthawi yomanga, ntchito yotsutsa-sag ya matope onyowa sizowoneka bwino. M'malo mwake, ma viscosity ena apakati komanso otsika koma osinthidwa a methyl cellulose ethers ali ndi ntchito yabwino kwambiri pakuwongolera mphamvu zamapangidwe amatope onyowa.
Zipangizo zamakhoma zomangira nthawi zambiri zimakhala zomangira, ndipo zonse zimakhala ndi mayamwidwe amphamvu amadzi. Komabe, zomangira za gypsum zomwe zimagwiritsidwa ntchito pomanga khoma zimakonzedwa ndikuwonjezera madzi pakhoma, ndipo madziwo amatengedwa mosavuta ndi khoma, zomwe zimapangitsa kusowa kwa madzi ofunikira kuti hydration ya gypsum ikhale yovuta, zomwe zimapangitsa kuti pakhale zovuta pakumanga ndikuchepetsa. kulimba kwa mgwirizano, zomwe zimapangitsa ming'alu, zovuta zamakhalidwe monga kubowola ndi kusenda. Kupititsa patsogolo kusungirako madzi kwa zida zomangira za gypsum kumatha kupititsa patsogolo zomangamanga komanso mphamvu yomangira khoma. Chifukwa chake, wosungira madzi wakhala chimodzi mwazinthu zofunika kwambiri zopangira gypsum zomangira.
Kupaka gypsum, gypsum yomangidwa, gypsum caulking, gypsum putty ndi zipangizo zina zomangira zimagwiritsidwa ntchito. Pofuna kupititsa patsogolo ntchito yomanga, ma gypsum retarders amawonjezeredwa panthawi yopanga kuti atalikitse nthawi yomanga gypsum slurry. Chifukwa gypsum imasakanikirana ndi Retarder, yomwe imalepheretsa hydration ya hemihydrate gypsum. Mtundu uwu wa gypsum slurry uyenera kusungidwa pakhoma kwa maola 1 mpaka 2 usanakhazikike. Makoma ambiri amakhala ndi mphamvu zoyamwitsa madzi, makamaka makoma a njerwa ndi konkire ya mpweya. Khoma, porous kutchinjiriza bolodi ndi ena opepuka zipangizo zatsopano khoma, kotero madzi posungira mankhwala ayenera kuchitidwa pa gypsum slurry kupewa kulanda mbali ya madzi mu slurry khoma, chifukwa cha kusowa kwa madzi ndi chosakwanira hydration pamene gypsum. slurry ndi kuumitsa. Zimayambitsa kupatukana ndi kupukuta kwa mgwirizano pakati pa gypsum ndi khoma pamwamba. Kuwonjezera kwa wothandizira madzi ndi kusunga chinyezi chomwe chili mu gypsum slurry, kuonetsetsa kuti hydration ya gypsum slurry imayenderana ndi mawonekedwe, kuti atsimikizire mphamvu yolumikizana. Zomwe zimagwiritsidwa ntchito posungira madzi ndi ma cellulose ethers, monga: methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), etc. ufa wapadziko lapansi wosowa, ndi zina zotere zitha kugwiritsidwanso ntchito kukonza kasungidwe ka madzi.
Ziribe kanthu kuti ndi mtundu wanji wa wothandizira madzi omwe amatha kuchedwetsa hydration rate ya gypsum mpaka madigiri osiyanasiyana, pamene kuchuluka kwa retarder kumakhalabe kosasinthika, wothandizira madzi amatha.
nthawi zambiri kuchedwetsa kukhazikitsa kwa mphindi 15-30. Chifukwa chake, kuchuluka kwa retarder kumatha kuchepetsedwa moyenera.
Nthawi yotumiza: Nov-24-2022