Gypsum retarder
Ma gypsum retardants amagwira ntchito yofunika kwambiri pantchito yomanga ndi zida zomangira, ndikuwongolera nthawi yokhazikika yazinthu zopangidwa ndi gypsum kuti zitsimikizire kuti zimagwira ntchito bwino komanso zimagwiritsidwa ntchito. Zina mwa zolepheretsa izi, ma organic acid, mchere wosungunuka, maphosphates oyambira, ndi mapuloteni ndizinthu zazikulu zomwe zimadziwika chifukwa cha mphamvu yawo. Ma organic acid odziwika kwambiri omwe amagwiritsidwa ntchito ngati retarders ndi citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid, ndi sodium acrylate. Mkati mwa gululi, citric acid ndi mchere wake wa sodium wakopa chidwi kwambiri chifukwa cha kuchepa kwawo kwakukulu komwe kumawonetsedwa ngakhale pamlingo wocheperako. Kuchita bwino kwambiri kumeneku kumapindulitsa makamaka pamapulogalamu osiyanasiyana a gypsum, chifukwa kumathandizira kuti nthawi yayitali yogwirira ntchito ndikusunga mtundu womwe mukufuna wa chinthu chomaliza. Kuphatikiza pa ma organic acid, ma phosphate retarders monga sodium hexametaphosphate ndi sodium polyphosphate amagwiritsidwa ntchito kwambiri. Zinthuzi ndizofunika kwambiri popanga zinthu za gypsum, kuphatikiza gypsum yomangika, gypsum putty, ndi zida zina zomwe zimagwira ntchito popanga zida zomangira za gypsum. Ntchito yayikulu ya ma phosphate retarders awa ndikuchepetsa ma condensation a gypsum, kulola kuwongolera kopitilira muyeso panthawi yosakanikirana ndikugwiritsa ntchito. Pophatikizira mwanzeru zotsalirazi, opanga amatha kukulitsa magwiridwe antchito a zinthu za gypsum, potero amapangitsa kuti malo omanga azitha kugwira bwino ntchito ndikuwonetsetsa kuti zomwe akufuna zikukwaniritsidwa. Kufunika kwa otsalira odalirika komanso ogwira mtima kwachititsa kuti afufuze kafukufuku wambiri m'derali, makamaka poyang'ana njira zogwiritsira ntchito zipangizozi ndi gypsum. Zomwe zapeza zikuwonetsa kuti mawonekedwe a mamolekyu a otsalirawo amakhala ndi gawo lalikulu pakuchita bwino kwawo, zomwe zimapangitsa kuti pakhale zatsopano zopangira kuti awonjezere phindu lawo. Pamene ntchito yomanga ikupitabe patsogolo, kufunikira kwa zinthu zamtengo wapatali, zolimba za gypsum sikukhazikika. Chifukwa chake, kukulitsa ndi kugwiritsa ntchito zida zapamwamba zochepetsera ntchito ndizofunikira kuti zikwaniritse zofunikira zomwe zikuchulukirachulukira zamapulojekiti amakono omanga. Kuphatikiza apo, kamangidwe kazinthuzi kamayang'aniridwa mosamala, zomwe zimapangitsa ofufuza kuti afufuze zomwe zitha kukhazikika komanso zina zomwe zingawonongeke m'malo mwa anthu omwe amalephera kukalamba. Kugwirizana pakati pa kuchita bwino ndi kukhudzidwa kwa chilengedwe ndikofunikira chifukwa opanga akufuna kupereka mayankho ogwira mtima kwambiri a gypsum omwe amagwirizana ndi zolinga zokhazikika zamakampani. Ponseponse, kugwiritsa ntchito ma gypsum retardants, makamaka ma organic acid, mchere wosungunuka, ndi ma phosphates, ndizofunikira kwambiri pazomangamanga za gypsum zomwe zimapangitsa kuti zitheke. Pogwiritsa ntchito othandizira osiyanasiyana ochedwetsa, omanga amatha kuwonetsetsa kuti zomangazo zikuyenda bwino ndikuteteza kukhulupirika ndi moyo wautali wa zomanga. Kupita patsogolo kwa kafukufuku wa gypsum retardation sikungowonjezera magwiridwe antchito komanso kumathandizira kuti ntchito yomanga ikhale yosasunthika, zomwe zimapangitsa kuti pakhale zotulukapo zabwinoko pakugwira ntchito komanso udindo wa chilengedwe. Pomaliza, kumvetsetsa mitundu yosiyanasiyana ya ma gypsum retardants omwe akugwiritsidwa ntchito pano ndikofunikira kwa ogwira nawo ntchito pantchito yomanga, chifukwa imawapatsa mphamvu yosankha zowonjezera zomwe zimakwaniritsa zomwe zikufunidwa ndikutsata njira zokhazikika. Kudziwa kumeneku kumapititsa patsogolo ntchito yomanga, kuwonetsetsa kuti tsogolo la kupanga gypsum limadziwika ndi luso, luso, komanso kusamala zachilengedwe.
