HPMC (hydroxypropyl methylcellulose)ndi wamba madzi sungunuka cellulose yochokera, amene kwambiri ntchito m'munda, makamaka kusinthidwa konkire. Lili ndi zinthu zambiri zabwino kwambiri, monga kukhuthala, kusunga madzi, komanso rheology yabwino. Itha kupititsa patsogolo kukhazikika kwa konkire ndi kukhazikika kwa konkriti, ndikusunga magwiridwe antchito mokhazikika pansi pazikhalidwe zosiyanasiyana.
1. Makhalidwe oyambira ndi ntchito za HPMC
HPMC imapezeka ndi kusintha kwa mankhwala a cellulose achilengedwe, okhala ndi kusungunuka kwamadzi abwino komanso kupanga filimu yabwino kwambiri. Ntchito yake yayikulu ndikuwongolera mawonekedwe a konkire popanga njira yokhazikika ya colloidal. Mu konkire, HPMC nthawi zambiri imagwiritsidwa ntchito ngati chowonjezera kuti chiwongolere magwiridwe antchito ake, kukulitsa kukana kwake kwamadzi, ndikuchepetsa porosity, potero kuwongolera magwiridwe antchito a nthawi yayitali.
2. Njira yochitira HPMC mu konkire
2.1 Kupititsa patsogolo magwiridwe antchito a konkriti
HPMC ali amphamvu thickening zotsatira. Pambuyo powonjezera kuchuluka koyenera kwa HPMC ku konkire, kumatha kuwongolera bwino kumamatira ndi kuthirira konkriti. Popanga maukonde ogawa yunifolomu, HPMC imatha kuchepetsa kuyanjana pakati pa tinthu tating'ono ta simenti ndikupangitsa kuti ikhale yofananira panthawi yosakaniza. Mwanjira imeneyi, sizingangowonjezera kugwira ntchito kwa konkire, komanso kupewa kugwa kwa tinthu ta simenti panthawi yomanga, kuonetsetsa kuti konkire imamanga.
2.2 Sinthani mphamvu ya hydration reaction
Kukhazikika kwa konkire nthawi zambiri kumagwirizana kwambiri ndi kuchuluka kwa ma hydration reaction. Pansi pa chiŵerengero choyenera cha simenti ndi madzi, HPMC ikhoza kuonjezera kusunga madzi, kuchepetsa kutentha kwa madzi, ndi kupereka simenti ndi nthawi yayitali ya hydration reaction. Izi zimathandiza kuti tinthu ting'onoting'ono ta simenti tigwirizane ndi madzi, kumalimbikitsa mapangidwe a miyala ya simenti, komanso kumapangitsanso kachulukidwe ndi mphamvu ya konkire, potero kumapangitsa kuti konkriti ikhale yolimba.
2.3 Kupititsa patsogolo kusakwanira
The porosity ndi pore kukula mu konkire mwachindunji zimakhudza impermeability ake. Chifukwa HPMC ali bwino mayamwidwe madzi ndi posungira madzi, akhoza kupanga yunifolomu hydration wosanjikiza mu konkire kupewa kutaya mofulumira madzi. Ndi kusintha microstructure konkire, HPMC akhoza bwino kuchepetsa chiwerengero ndi porosity wa capillaries, potero kuwongolera impermeability ndi chisanu kukana konkire. Izi ndizofunikira makamaka m'madera ozizira, chifukwa zimatha kuteteza zinthu zopangidwa ndi simenti kuti zisagwe chifukwa cha kuzizira komanso kumapangitsa kuti konkriti ikhale yolimba komanso yolimba.
2.4 Limbikitsani zoletsa kukalamba za konkriti
Pakapita nthawi, konkire idzakhala ndi zovuta zosiyanasiyana zachilengedwe, kuphatikizapo kusintha kwa kutentha, kusinthasintha kwa chinyezi, ndi kukokoloka kwa mankhwala, zomwe zingayambitse kukalamba konkire. HPMC imatha kupititsa patsogolo luso loletsa kukalamba la konkriti powonjezera mawonekedwe ake. Makamaka, HPMC akhoza kuonjezera hydration mkati konkire, bwino ziletsa msanga madzi imfa ya particles simenti, potero kuchepetsa akulimbana mwala simenti ndi kuchedwetsa ukalamba ndondomeko konkire. Kuphatikiza apo, HPMC imathanso kuchepetsa kulowetsedwa kwa mchere ndi zinthu zovulaza mu konkriti, kupititsa patsogolo kulimba kwa konkriti.
2.5 Kupititsa patsogolo kukana kukokoloka kwa mankhwala a konkire
M'madera ogulitsa, malo am'madzi kapena madera ena okhala ndi mankhwala owononga, konkire nthawi zambiri imakhala ndi zinthu zowononga monga ma acid, alkalis, ndi chloride ions. HPMC imathandizira kuchepetsa kulumikizana pakati pa mankhwalawa ndi matrix a konkriti ndikuchepetsa kukokoloka kwawo kudzera mufilimu yoteteza yomwe imapanga. Pa nthawi yomweyo, HPMC akhoza kumapangitsanso compactness wa konkire, kuchepetsa porosity, kuchepetsa njira malowedwe a zinthu zoipa, ndi kusintha dzimbiri kukana konkire.
3. Zotsatira zenizeni za HPMC pa kukhazikika kwa konkire
3.1 Sinthani kukana kuzizira
Konkire idzakhudzidwa ndi kuzizira kwa nyengo yozizira, zomwe zimapangitsa ming'alu ndi kuchepa kwa mphamvu. HPMC ikhoza kupititsa patsogolo kukana kwake kwachisanu ndi chisanu mwa kukonza microstructure ya konkire. Pochepetsa porosity ndikuwonjezera kachulukidwe konkire, HPMC imathandizira kuchepetsa kusungirako madzi ndikuchepetsa kuwonongeka komwe kumachitika chifukwa cha kuzizira kozizira. Kuphatikiza apo, HPMC imapangitsa kuti konkire isalowe m'madzi, ndikupangitsa kuti konkire ikhale yosasunthika, ndikupangitsa kuti konkire isalowe m'madzi nthawi yachisanu, potero imathandizira kulimba kwa konkriti.
3.2 Kuchuluka kwa sulphate kukana
Kukokoloka kwa sulphate ndi chimodzi mwazinthu zomwe zimawopseza kukhazikika kwa konkriti, makamaka m'madera a m'mphepete mwa nyanja kapena m'mafakitale. HPMC akhoza kusintha konkire a sulfate kukana, ziletsa kulowa mankhwala monga sulfates ndi kuchepetsa porosity ndi utithandize impermeability. Kuphatikiza apo, kuwonjezera kwa HPMC kumatha kulimbikitsa kuphatikizika kwa mkati mwazinthu zopangira simenti, zomwe zimapangitsa kuti zikhale zovuta kuti ayoni a sulfate alowe ndikuchitapo kanthu ndi calcium aluminate mu simenti, potero kuchepetsa kufalikira ndi kusweka komwe kumachitika chifukwa cha izi.
3.3 Kupititsa patsogolo kukhazikika kwa nthawi yayitali
Kukhazikika kwa nthawi yayitali kwa konkire nthawi zambiri kumakhudzidwa ndi chilengedwe chakunja, monga mvula, kusintha kwa nyengo, ndi kukokoloka kwa mankhwala. HPMC imatha kukulitsa moyo wautumiki wa konkire mwa kukonza kachulukidwe chonse komanso kusakwanira kwa konkriti, makamaka m'malo ovuta monga kutentha, chinyezi, ndi mchere. Ikhoza kupititsa patsogolo kulimba kwa konkire pakugwiritsa ntchito nthawi yayitali pochepetsa kutuluka kwa madzi, kuchepetsa porosity, ndi kupititsa patsogolo kukhazikika kwa mankhwala.
Monga chosinthira konkriti chothandiza,Mtengo wa HPMCakhoza kwambiri kusintha durability konkire ndi kuwongolera workability konkire, utithandize hydration anachita, kusintha impermeability ndi kukana kukokoloka kwa mankhwala. Pazomanga zamtsogolo, HPMC ikuyembekezeka kukhala chinthu chofunikira kwambiri pakuwongolera kukhazikika kwanthawi yayitali komanso kudalirika kwa zomanga za konkriti. Ndi kupita patsogolo kosalekeza kwa sayansi ndi ukadaulo, kugwiritsa ntchito HPMC mu konkriti kudzakhala kokulirapo, zomwe zikuthandizira kwambiri kupititsa patsogolo ntchito yomanga.
Nthawi yotumiza: Nov-08-2024