Mphamvu ya ufa wa latex pa kapangidwe ka zinthu zopangidwa ndi simenti

Zinthu zopangidwa ndi simenti zikangowonjezeredwa ndi ufa wa latex zikakumana ndi madzi, madzi amayamba kulowa, ndipo yankho la calcium hydroxide limafika mwachangu ndipo makristalo amatuluka, ndipo nthawi yomweyo, makristalo a ettringite ndi ma gels a calcium silicate hydrate amapangidwa. Tinthu tolimba timayikidwa pa gel ndi tinthu ta simenti topanda madzi. Pamene madzi akupitirira, zinthu zosungunuka zimawonjezeka, ndipo tinthu ta polima timasonkhana pang'onopang'ono m'maselo a capillary, ndikupanga wosanjikiza wodzaza pamwamba pa gel ndi pa tinthu ta simenti topanda madzi.

Tinthu ta polymer tomwe taphatikizidwa timadzaza pang'onopang'ono ma pores, koma osati kwathunthu mkati mwa ma pores. Pamene madzi akuchepa kwambiri chifukwa cha madzi kapena kuumitsa, tinthu ta polymer tomwe talumikizidwa kwambiri pa gel ndi m'ma pores timaphatikizana kukhala filimu yopitilira, ndikupanga chisakanizo cholowa mkati ndi phala la simenti losungunuka ndikuwongolera madzi. Kugwirizana kwa zinthu ndi ma aggregates. Chifukwa zinthu zamadzimadzi zokhala ndi ma polima zimapanga chophimba pamalo olumikizirana, zitha kukhudza kukula kwa makristasi a ettringite ndi coarse calcium hydroxide; ndipo chifukwa ma polima amaundana kukhala mafilimu m'ma pores a malo osinthira mawonekedwe, zinthu zopangidwa ndi simenti ya polima Malo osinthira ndi okhuthala kwambiri. Magulu ogwira ntchito m'mamolekyu ena a polima adzapanganso ma cross-linking reactions ndi Ca2+ ndi A13+ mu zinthu zamadzimadzi za simenti kuti apange ma bond apadera, kukonza kapangidwe ka zinthu zolimba zopangidwa ndi simenti, kuchepetsa kupsinjika kwamkati, ndikuchepetsa kupanga ma microcracks. Pamene kapangidwe ka simenti ya gel kakukula, madzi amamwa ndipo tinthu ta polymer timatsekedwa pang'onopang'ono m'ma pores. Pamene simenti imawonjezeredwa madzi, chinyezi chomwe chili m'mabowo a capillary chimachepa, ndipo tinthu ta polima timasonkhana pamwamba pa simenti yothira madzi gel/tinthu ta simenti tosaphwanyidwa madzi ndi tinthu ta simenti tomwe timakhala ndi madzi, motero timapanga wosanjikiza wokhazikika wokhala ndi mabowo akuluakulu. Wodzazidwa ndi tinthu ta polima tomatira kapena todzimatira tokha.

Ntchito ya ufa wa latex wosungunukanso mu matope imayendetsedwa ndi njira ziwiri za hydration ya simenti ndi kupanga filimu ya polima. Kupangidwa kwa dongosolo lophatikizana la hydration ya simenti ndi kupanga filimu ya polima kumachitika m'magawo anayi:

(1) Pambuyo poti ufa wa latex wosungunukanso wasakanizidwa ndi simenti, umafalikira mofanana mu dongosolo;

(2) Tinthu ta polima timayikidwa pamwamba pa gel ya simenti yothira madzi/tinthu ta simenti tosaphwanyidwa madzi;

(3) Tinthu ta polima timapanga gawo losalekeza komanso lopapatiza lokhala ndi zinthu zambirimbiri;

(4) Pa nthawi ya simenti yothira madzi, tinthu ta polima tomwe timakulungidwa bwino timasonkhana pamodzi kukhala filimu yopitilira, zomwe zimalumikiza zinthu zamadzimadzi pamodzi kuti apange kapangidwe ka netiweki yonse.

Kusungunuka kwa ufa wa latex wosungunuka m'madzi kumatha kupanga filimu yosasungunuka m'madzi (thupi la polymer network) itatha kuuma, ndipo thupi la polymer network lotsika la modulus losungunuka limatha kukonza magwiridwe antchito a simenti; nthawi yomweyo, mu molekyulu ya polymer Magulu ena a polar mu simenti amachita zinthu ndi mankhwala a simenti kuti apange milatho yapadera, kukonza kapangidwe kake ka zinthu za simenti, ndikuchepetsa ndikuchepetsa kupanga ming'alu. Pambuyo poti ufa wa latex wosungunuka m'madzi wawonjezeredwa, kuchuluka kwa madzi koyambirira kwa simenti kumachepa, ndipo filimu ya polymer imatha kukulunga pang'ono kapena kwathunthu tinthu ta simenti, kuti simenti ikhale ndi madzi okwanira ndipo mawonekedwe ake osiyanasiyana athe kuwongoleredwa.

Ufa wa latex wosungunuka umagwira ntchito yofunika kwambiri ngati chowonjezera pa matope omangira. Kuyika ufa wa latex wosungunuka mu matope kungapangitse zinthu zosiyanasiyana za matope monga zomatira za matailosi, matope otenthetsera kutentha, matope odzilinganiza okha, putty, matope opaka pulasitala, matope okongoletsera, cholumikizira, matope okonzanso ndi zinthu zotsekera zosalowa madzi, ndi zina zotero. Kugwiritsa ntchito matope omangira ndi momwe amagwirira ntchito. Zachidziwikire, pali mavuto osinthika pakati pa ufa wa latex wosungunuka ndi simenti, zosakaniza ndi zosakaniza, zomwe ziyenera kuperekedwa chisamaliro chokwanira pa ntchito zinazake.