Monga zomatira zazikulu za putty, kuchuluka kwa redispersible latex powder kumakhudza mphamvu yomangirira ya putty.Figure 1 ikuwonetsa mgwirizano pakati pa kuchuluka kwa redispersible latex powder ndi mphamvu ya mgwirizano. Pamene kuchuluka kwa ufa wa latex ndi kochepa, mphamvu yogwirizanitsa imawonjezeka ndi kuwonjezeka kwa kuchuluka kwa ufa wa latex. Ngati mlingo wa emulsion ufa ndi 2% , mphamvu ya mgwirizano imafika ku 0182MPA, yomwe imagwirizana ndi dziko lonse la 0160MPA. Chifukwa chake ndi chakuti hydrophilic latex ufa ndi gawo lamadzimadzi la kuyimitsidwa kwa simenti limalowa mu pores ndi capillary ya masanjidwewo, ufa wa latex umapanga filimu mu pores ndi ma capillaries ndipo umakongoletsedwa pamwamba pa masanjidwewo, motero kuonetsetsa kuti pali mphamvu yabwino yolumikizirana pakati pa zinthu zoyambira ndi masanjidwewo [4]. Pamene putty imachotsedwa mu mbale yoyesera, zikhoza kupezeka kuti kuwonjezeka kwa kuchuluka kwa ufa wa latex kumawonjezera kumamatira kwa putty ku gawo lapansi. Komabe, pamene kuchuluka kwa ufa wa latex kunali pamwamba pa 4%, kuwonjezeka kwa mphamvu zomangira kunachepetsedwa. Osati kokha redispersible latex ufa, komanso inorganic zipangizo monga simenti ndi heavy calcium carbonate zimathandiza kuti kugwirizana mphamvu putty.
Kukana kwamadzi ndi kukana kwa alkali kwa putty ndiyeso lofunikira kuti muwone ngati putty angagwiritsidwe ntchito ngati kukana kwamadzi khoma lamkati kapena putty lakunja. Mkuyu 2 anafufuza zotsatira za kuchuluka kwa ufa wa latex wotayikanso pa kukana kwa madzi kwa putty.
Monga momwe tingawonere kuchokera ku Chithunzi 2, pamene kuchuluka kwa ufa wa latex ndi wocheperapo 4%, ndi kuwonjezeka kwa kuchuluka kwa ufa wa latex, kuchuluka kwa madzi kumawonetsa kutsika. Pamene mlingo unali woposa 4%, kuchuluka kwa madzi kumatsika pang'onopang'ono. Chifukwa chake ndi chakuti simenti ndizomwe zimamangiriza mu putty, pamene palibe redispersible latex ufa wowonjezedwa, pali kuchuluka kwa voids mu dongosolo, pamene redispersible latex ufa wawonjezedwa, emulsion polima yopangidwa pambuyo pa kubalalitsidwanso ikhoza kukhazikika mu filimu mu putty voids, kusindikiza ma voids mu putty system, kupanga filimu ya putty, ndikupanga filimu pambuyo pake. kuyanika, motero kuteteza bwino kulowa madzi, kuchepetsa kuchuluka kwa mayamwidwe madzi, kotero kuti kumatheka madzi kukana. Pamene mlingo wa latex ufa kufika 4% , redispersible latex ufa ndi redispersible polima emulsion akhoza kwenikweni kudzaza voids mu dongosolo putty kwathunthu ndi kupanga wathunthu ndi wandiweyani filimu, motero, chizolowezi kuchepa kwa madzi mayamwidwe putty kumakhala kosalala ndi kuchuluka kwa kuchuluka kwa latex ufa.
Poyerekeza zithunzi za SEM za putty zopangidwa ndi kuwonjezera redispersible latex ufa kapena ayi, zikhoza kuwoneka kuti mu Mkuyu 3 (a) , zinthu zowonongeka sizimangiriridwa mokwanira, pali voids ambiri, ndipo voids sizigawidwa mofanana, choncho, mphamvu zake zomangira sizili bwino. Kuchuluka kwa voids m'dongosolo kumapangitsa kuti madzi azitha kulowa mosavuta, kotero kuti madzi amamwa kwambiri. Mkuyu 3 (b) , emulsion polima pambuyo kachiwiri kubalalika akhoza kwenikweni kudzaza voids mu dongosolo putty ndi kupanga filimu wathunthu, kotero kuti zakuthupi mu dongosolo lonse putty akhoza amangiridwe kwambiri kwathunthu, ndipo kwenikweni alibe kusiyana, Choncho akhoza kuchepetsa mayamwidwe putty madzi. Poganizira mphamvu ya ufa wa latex pa mphamvu yogwirizanitsa ndi kukana madzi a putty, ndikuganizira mtengo wa ufa wa latex, 3% ~ 4% ya ufa wa latex ndi woyenera. Mlingo wake ukakhala 3% ~ 4%, putty imakhala ndi mphamvu zomangirira komanso kukana madzi abwino
Nthawi yotumiza: Jul-19-2023