Hydroxypropyl methylcellulose (HPMC) makamaka imagwira ntchito yosungira madzi, kulimbitsa ndi kupititsa patsogolo ntchito yomanga mu simenti, gypsum ndi zipangizo zina za ufa.Kuchita bwino kwambiri posungira madzi kumatha kulepheretsa ufawo kuti usawume ndi kusweka chifukwa cha kutaya madzi ochulukirapo, ndikupanga ufa kukhala ndi nthawi yayitali yomanga.
Sankhani zinthu za simenti, zophatikizika, zophatikizira, zosungira madzi, zomangira, zosinthira ntchito yomanga, ndi zina zotero. Mwachitsanzo, matope opangidwa ndi gypsum amakhala omangirira bwino kuposa matope opangidwa ndi simenti pamalo owuma, koma magwiridwe ake amachepa. mofulumira pansi pa chikhalidwe cha kuyamwa kwa chinyezi ndi kuyamwa madzi.Chandamale chomangira mphamvu ya pulasitala matope ayenera kuchepetsedwa wosanjikiza ndi wosanjikiza, ndiko kuti, mphamvu yomangira pakati pa wosanjikiza m'munsi ndi mawonekedwe chithandizo wothandizira ≥ mphamvu yolumikizana pakati pa maziko wosanjikiza matope ndi mawonekedwe chithandizo wothandizira ≥ mgwirizano pakati pa maziko. wosanjikiza matope ndi pamwamba wosanjikiza matope Mphamvu ≥ mphamvu yolumikizana pakati pa matope apamwamba ndi zinthu za putty.
Cholinga chabwino cha hydration cha matope a simenti pamunsi ndikuti mankhwala a simenti amadzimadzi amamwa madzi pamodzi ndi maziko, amalowa m'munsi, ndikupanga "kulumikizana kwakukulu" kothandiza ndi maziko, kuti akwaniritse mphamvu zomangira zofunika.Kuthirira molunjika pamwamba pa m'munsi kungayambitse kubalalitsidwa kwakukulu mu kuyamwa kwamadzi m'munsi chifukwa cha kusiyana kwa kutentha, nthawi yothirira, ndi kuthirira mofanana.Pansi pake imakhala ndi mayamwidwe ochepa amadzi ndipo idzapitirizabe kuyamwa madzi mumatope.Simenti ya simenti isanapitirire, madzi amatengedwa, zomwe zimakhudza simenti hydration ndi kulowa kwa hydration mankhwala mu masanjidwewo;tsinde lake lili ndi mayamwidwe aakulu amadzi, ndipo madzi a mumtondo amayenda pansi.Kuthamanga kwapakatikati kumayenda pang'onopang'ono, ndipo ngakhale wosanjikiza wochuluka wa madzi umapangidwa pakati pa matope ndi matrix, zomwe zimakhudzanso mphamvu ya mgwirizano.Choncho, kugwiritsa ntchito wamba m'munsi madzi kuthirira njira osati kulephera bwino kuthetsa vuto la mayamwidwe mkulu madzi pa khoma m'munsi, koma zidzakhudza kugwirizana mphamvu pakati matope ndi m'munsi, chifukwa hollowing ndi akulimbana.
Mphamvu ya cellulose ether pa compressive ndi kukameta ubweya wa matope a simenti.
Ndi kuwonjezera kwa cellulose ether, mphamvu za compressive ndi shear zimachepetsa, chifukwa ether cellulose imatenga madzi ndikuwonjezera porosity.
Kugwira ntchito kwa mgwirizano ndi mphamvu zomangirira zimadalira ngati mawonekedwe pakati pa matope ndi zinthu zoyambira akhoza kukhala mokhazikika komanso moyenera "kulumikizana kwakukulu" kwa nthawi yayitali.
Zomwe zimakhudza mphamvu yama bond ndi:
1. Makhalidwe amayamwidwe amadzi ndi kuuma kwa mawonekedwe a gawo lapansi.
2. Mphamvu yosungira madzi, mphamvu yolowera ndi mphamvu zamapangidwe amatope.
3. Zida zomangira, njira zomangira ndi malo omanga.
Chifukwa chosanjikiza chopangira matope chimakhala ndi mayamwidwe ena amadzi, pambuyo poti mazikowo atenga madzi mumtondo, kupangika kwa matope kumasokonekera, ndipo zikavuta kwambiri, zinthu za simenti mumatope sizikhala ndi madzi okwanira, zomwe zimapangitsa mu mphamvu, mwapadera Chifukwa chake ndi chakuti mawonekedwe amphamvu pakati pa matope owumitsidwa ndi maziko apansi amakhala otsika, zomwe zimapangitsa kuti matope awonongeke ndikugwa.Njira yothetsera vutoli ndiyo kuthirira maziko, koma n'zosatheka kuonetsetsa kuti mazikowo ndi onyowa mofanana.
Nthawi yotumiza: May-06-2023