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.
Chitani kusankha kwa zida za simenti, zophatikizika, zophatikizika, zosungira madzi, zomangira, zosinthira ntchito yomanga, ndi zina zambiri. Mwachitsanzo, matope opangidwa ndi gypsum amakhala ndi mgwirizano wabwinoko kuposa matope opangidwa ndi simenti pamalo owuma, koma magwiridwe ake omangika amachepetsa mwachangu pansi pamikhalidwe ya kuyamwa kwa chinyezi ndi kuyamwa madzi. Chandamale chomangira mphamvu ya pulasitala matope ayenera kuchepetsedwa wosanjikiza ndi wosanjikiza, ndiko kuti, mphamvu yomangiriza pakati pa wosanjikiza m'munsi ndi mawonekedwe chithandizo wothandizira ≥ mphamvu yomangiriza pakati pa m'munsi wosanjikiza matope ndi mawonekedwe chithandizo wothandizira ≥ mgwirizano pakati pa maziko wosanjikiza matope ndi pamwamba wosanjikiza matope Mphamvu ≥ mphamvu zomangira pakati pa matope pamwamba ndi putty zakuthupi.
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 ya hydration ndi kulowa kwa mankhwala a hydration mu matrix; mazikowo amakhala ndi mayamwidwe akuluakulu 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 njira osati kulephera mogwira kuthetsa vuto la mayamwidwe mkulu madzi a pakhoma 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 ndi madzi 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 wosanjikiza m'munsi utenga madzi mumtondo, kukhazikika kwa matope kumasokonekera, ndipo zikavuta kwambiri, zinthu za simenti mumatope sizikhala ndi madzi okwanira, zomwe zimapangitsa mphamvu, yapadera. Njira yothetsera vutoli ndiyo kuthirira maziko, koma n'zosatheka kuonetsetsa kuti mazikowo ndi onyowa mofanana.
Nthawi yotumiza: May-06-2023