Tsiku Lotumiza: 27 Jun, 2022
4. Wochedwa
Ma retarders amagawidwa m'ma organic retarders ndi inorganic retarders. Zambiri mwazoletsa organic zimakhala ndi mphamvu yochepetsera madzi, motero amatchedwanso ochepetsa komanso ochepetsa madzi. Masiku ano, timagwiritsa ntchito organic retarders. Organic retarders makamaka amachepetsa kuthamanga kwa C3A, ndipo ma lignosulfonates amathanso kuchedwetsa hydration ya C4AF. Mitundu yosiyanasiyana ya lignosulfonates imatha kuwonetsa zinthu zosiyanasiyana ndipo nthawi zina zimayambitsa simenti yonyenga.
Mavuto otsatirawa ayenera kutsatiridwa mukamagwiritsa ntchito retarder mu konkriti yamalonda:
A. Samalani kuyanjana ndi makina a simenti ndi zinthu zina zophatikizika ndi mankhwala.
B. Samalani ndi kusintha kwa kutentha kwa chilengedwe
C. Samalani ndi momwe ntchito yomanga ikuyendera komanso mtunda wa mayendedwe
D. Samalirani zofunikira za polojekitiyi
E. Chisamaliro chiyenera kuperekedwa ku kulimbikitsa kukonza pamene
Mavuto otsatirawa ayenera kutsatiridwa mukamagwiritsa ntchito retarder mu konkriti yamalonda:
A. Samalani kuyanjana ndi makina a simenti ndi zinthu zina zophatikizika ndi mankhwala.
B. Samalani ndi kusintha kwa kutentha kwa chilengedwe
C. Samalani ndi momwe ntchito yomanga ikuyendera komanso mtunda wa mayendedwe
D. Samalirani zofunikira za polojekitiyi
E. Chisamaliro chiyenera kuperekedwa ku kulimbikitsa kukonza pamene
Sodium sulphate ndi ufa woyera, ndipo mlingo woyenera ndi 0.5% mpaka 2.0%; mphamvu yoyambilira si yabwino ngati ya CaCl2. Mphamvu yoyambirira ya konkire ya simenti ndi yofunika kwambiri, koma mphamvu yapambuyo pake imachepa pang'ono. Mlingo wa sodium sulphate oyambirira-mphamvu wothandizila prestressed konkire nyumba sayenera upambana 1%; Mlingo wa zomangira zolimba za konkriti m'malo achinyezi sayenera kupitirira 1.5%; mlingo waukulu kwambiri udzayendetsedwa mosamalitsa.
Kuwonongeka; "Hoafrost" pamwamba pa konkire, zomwe zimakhudza maonekedwe ndi mapeto. Komanso, sodium sulphate oyambirira mphamvu wothandizira sayenera kugwiritsidwa ntchito mu ntchito zotsatirazi:
a. Zomangamanga zomwe zimalumikizana ndi zitsulo zotayidwa kapena chitsulo cha aluminiyamu ndi zomangira zokhala ndi zitsulo zowonekera popanda njira zodzitetezera.
b. Kulimbitsa konkriti m'mafakitole ndi malo oyendera magetsi pogwiritsa ntchito mphamvu ya DC.
c. Zomanga za konkriti zomwe zili ndi zophatikiza zokhazikika.
Nthawi yotumiza: Jun-27-2022
