Tsiku Lotumiza: 7, Nov, 2022
Ntchito ya konkriti admixtures ndi kusintha otaya katundu wa konkire ndi kuchepetsa kuchuluka kwa simenti zipangizo konkire. Chifukwa chake, zosakaniza za konkriti zimagwiritsidwa ntchito kwambiri m'magawo osiyanasiyana omanga.
Limagwirira wa zochita za konkire admixtures:
Zomwe zimagwiritsidwa ntchito kwambiri ndi naphthalene-based admixtures ndi polycarboxylate-based admixtures ndi organic mankhwala okhala ndi kulemera kwakukulu kwa mamolekyulu (nthawi zambiri 1500-10000) ndipo ali m'gulu la owonjezera.
Molekyulu ya surfactant ili ndi mawonekedwe a bipolar, mapeto amodzi ndi gulu lopanda polar lipophilic (kapena gulu lopanda polar hydrophobic), ndipo mapeto ena ndi gulu la polar hydrophilic. Pambuyo pa surfactant kusungunuka m'madzi, imatha kuchita ntchito zosiyanasiyana monga kubalalitsa, kunyowetsa, emulsifying, kuchita thovu ndi kutsuka ndikuchepetsa kupsinjika kwapamwamba.
A. Adsorption-kubalalitsidwa
The fluidity wa kusakaniza konkire zimadalira kuchuluka kwa madzi aulere mu konkire. Pambuyo admixture anawonjezera kwa konkire, ndi simenti particles kumwazikana wina ndi mzake chifukwa directional adsorption wa mamolekyu admixture padziko particles simenti, chifukwa electrostatic repulsion pakati pawo. Chotsatira chake, mawonekedwe a flocculation a simenti amawonongeka, ndipo madzi ambiri aulere amamasulidwa, omwe amawonjezera kwambiri kusakaniza kwa konkire.
B. Kunyowetsa
Chifukwa cha dongosolo la ma admixture mamolekyu pamwamba pa tinthu ta simenti, filimu yamadzi yosungunuka ya monomolecular imapangidwa. Izi filimu madzi kumawonjezera kukhudzana m'dera pakati pa simenti particles ndi madzi mbali imodzi, ndipo ali ndi kunyowetsa zotsatira mbali inayo. Choncho, simentiyo imakhala ndi madzi okwanira ndipo mphamvu ya simenti imakula mofulumira.
Ntchito zoyambira zophatikizira konkriti:
1. Popanda kuchepetsa kugwiritsira ntchito madzi a unit, chiŵerengero cha madzi-binder sichinasinthe, chomwe chimapangitsa kuti konkriti yatsopano igwire ntchito ndikuwongolera madzi; chifukwa cha kuchuluka kwambiri kukhudzana m'dera pakati particles simenti ndi madzi, simenti mokwanira hydrated, ngakhale madzi-binder chiŵerengero chosasintha, mphamvu ya konkire nthawi zambiri amakhala ndi kusintha.
2. Pansi pa kukhalabe ndi ntchito inayake, kuchepetsa kumwa kwa madzi, kuchepetsa chiwerengero cha madzi-binder, ndi kukonza mphamvu ya konkire.
3. Pansi pakukhalabe ndi mphamvu zina, kuchepetsa kuchuluka kwa zinthu za simenti, kuchepetsa madzi, kusunga madzi osungira madzi osasinthika, ndikusunga simenti ndi zipangizo zina za simenti.
Momwe mungatulutsire bwino ndikugwiritsa ntchito zosakaniza za konkriti:
Kugula bwino ndi kugwiritsa ntchito zosakaniza kungapangitse ndalama zambiri komanso luso. Iwo sangakhoze kusintha mphamvu ya konkire, komanso kuchepetsa mtengo wa konkire mix chiŵerengero.
Njira yeniyeni ndi iyi:
a. Ulalo woyeserera
Kuyesa ndi kuyesa zizindikiro zosiyanasiyana zaumisiri za admixtures ndizofunikira kwambiri musanagule kukambirana. Kupyolera muyeso, miyezo yoyenerera ya zizindikiro zosiyanasiyana zamakono za admixture iyenera kutsimikiziridwa. Kuphatikizapo olimba zili admixtures, mlingo kuchepetsa madzi, kachulukidwe, slurry fluidity, mlingo konkire kuchepetsa madzi ndi zizindikiro zina luso. Zimaganiziridwa kuti mlingo wochepetsera madzi wa konkire ugwiritsidwe ntchito ngati chizindikiro chachikulu choyezera mlingo wamtundu wa admixtures.
b. Kugula zinthu
Pambuyo pofotokozera zoyenera kugwirizanitsa, zokambirana zogula zinthu zikhoza kuyamba. Alangizidwa kuti opanga ma admixture ayitanitsa mabidi molingana ndi milingo yoyenerera yotsimikiziridwa ndi mayesowo. Poganizira kuti khalidwe la kuperekera kwa admixture silocheperapo kusiyana ndi zofunikira, woperekayo adzatsimikiziridwa molingana ndi mfundo yopambana malonda pamtengo wotsika.
Nthawi yomweyo, kusankha opanga konkriti admixture ayenera kuganizira mozama kukula kwa wopanga, mtunda wa mayendedwe, mphamvu zoyendera, zokumana nazo komanso kuchuluka kwamtundu wamitundu yayikulu yosakanikirana kapena ma projekiti akuluakulu aumisiri, komanso kuthekera kwautumiki pambuyo pa malonda. ndi ma level. Monga chizindikiro chimodzi chowunikira opanga.
c. Ulalo wolandila
Malo osakanikirana amayenera kuyesa ma admixtures asanasungidwe, ndipo zotsatira zoyesa zimatha kusungidwa pokhapokha zotsatira za mayeso zitatsimikiziridwa molingana ndi miyezo yomwe yasainidwa mu mgwirizano. Ndikoyenera kusiyanitsa pakati pa zizindikiro zazikulu ndi zizindikiro zowonetsera. Kupyolera muzochita za nthawi yaitali, wolembayo amakhulupirira kuti zizindikiro zazikulu za admixtures ndi mlingo wa kuchepetsa madzi (matope) ndi konkriti kuchepetsa madzi; zizindikiro ndi kachulukidwe (enieni mphamvu yokoka), olimba okhutira ndi fluidity wa simenti phala. Chifukwa cha nthawi yoyesera, zizindikiro zaumisiri zomwe nthawi zambiri zimayesedwa mu ulalo wovomerezeka ndi kachulukidwe, kuchuluka kwa simenti ya simenti ndi kuchepetsa madzi (matope).
Nthawi yotumiza: Nov-07-2022
