1. Bayanin cellulose ether (HPMC)
Hydroxypropyl methylcellulose (HPMC) wani fili ne da aka saba amfani da shi na ether cellulose, wanda aka gyara ta hanyar sinadarai daga cellulose na halitta. Yana da kyakkyawar solubility na ruwa, samar da fim, thickening da m Properties, don haka ana amfani da ko'ina a cikin kayan gini. Aikace-aikacen HPMC a cikin kayan tushen siminti shine yafi don haɓaka yawan ruwa, riƙewar ruwa da daidaita lokacin saiti.
2.Basic tsari na saitin siminti
Hanyar siminti da ruwa don samar da hydrates ana kiransa hydration reaction. An raba wannan tsari zuwa matakai da yawa:
Lokacin ƙaddamarwa: Barbashi na siminti sun fara narkewa, suna samar da ions calcium da ions silicate, suna nuna yanayin kwarara na ɗan lokaci.
Lokacin haɓakawa: samfuran hydration suna ƙaruwa da sauri kuma tsarin saiti ya fara.
Lokacin raguwa: Yawan hydration yana raguwa, siminti ya fara taurare, kuma an kafa dutsen siminti mai ƙarfi.
Lokacin tabbatarwa: samfuran hydration a hankali suna girma kuma ƙarfi yana ƙaruwa a hankali.
Ana rarraba lokacin saiti zuwa lokacin saitin farko da lokacin saitin ƙarshe. Lokacin saitin farko yana nufin lokacin da man siminti ya fara rasa filastik, kuma lokacin saitin ƙarshe yana nufin lokacin da man siminti ya ɓace gaba ɗaya kuma ya shiga matakin taurare.
3. Mechanism na tasirin HPMC akan lokacin saita siminti
3.1 Tasiri mai kauri
HPMC yana da tasiri mai mahimmanci. Yana iya ƙara danko na siminti manna da kuma samar da wani high-danko tsarin. Wannan sakamako mai kauri zai shafi tarwatsawa da rarrabuwar simintin siminti, don haka yana shafar ci gaban halayen hydration. Tasirin daɗaɗɗa yana rage yawan ajiyar samfuran hydration akan saman simintin siminti, don haka jinkirta lokacin saiti.
3.2 Riƙewar ruwa
HPMC yana da kyakkyawan ƙarfin riƙe ruwa. Ƙara HPMC zuwa manna siminti na iya inganta riƙe ruwa na manna sosai. Babban riƙewar ruwa na iya hana ruwan da ke saman siminti daga ƙafewa da sauri, ta yadda za a kula da abin da ke cikin ruwa a cikin simintin siminti kuma ya tsawaita lokacin amsawar hydration. Bugu da ƙari, riƙe ruwa yana taimakawa man siminti ya kula da yanayin da ya dace yayin aikin warkewa da kuma rage haɗarin fashewa da ke haifar da asarar ruwa da wuri.
3.3 Rashin ruwa
HPMC na iya samar da fim mai kariya wanda ke rufe saman simintin siminti, wanda zai hana hydration dauki. Wannan fim ɗin kariya yana hana hulɗar kai tsaye tsakanin simintin siminti da ruwa, don haka jinkirta tsarin hydration na siminti da tsawaita lokacin saitawa. Wannan tasirin jinkiri yana bayyana musamman a cikin HPMC mai nauyin kwayoyin halitta.
3.4 Ingantaccen thixotropy
Bugu da ƙari na HPMC kuma na iya haɓaka thixotropy na ciminti slurry (watau yawan ruwa yana ƙaruwa a ƙarƙashin aikin ƙarfin waje kuma ya koma asalin asalin bayan an cire ƙarfin waje). Wannan thixotropic dukiya yana taimakawa wajen inganta aikin siminti slurry, amma dangane da saita lokaci, wannan ingantaccen thixotropy na iya sa slurry ya sake rarrabawa a ƙarƙashin karfi mai ƙarfi, yana ƙara tsawaita lokacin saiti.
4. Aikace-aikacen aikace-aikacen HPMC yana shafar lokacin saitin siminti
4.1 Kayan bene mai daidaita kai
A cikin kayan bene mai daidaita kai, siminti yana buƙatar dogon lokacin saiti na farko don daidaitawa da ayyukan ƙira. Haɗa HPMC na iya tsawaita lokacin saitin siminti na farko, wanda zai ba da damar kayan sarrafa kai su sami tsawon lokacin aiki yayin gini, guje wa matsalar da ke haifar da saitin siminti da wuri lokacin gini.
4.2 Turmi riga-kafi
A cikin turmi da aka riga aka haɗa, HPMC ba wai kawai yana inganta riƙewar turmi ba, har ma yana tsawaita lokacin saiti. Wannan yana da mahimmanci musamman ga lokatai masu tsayin sufuri da lokacin gini, tabbatar da cewa turmi yana kula da aiki mai kyau kafin amfani da kuma guje wa matsalolin gini da ke haifar da ɗan gajeren lokacin saiti.
4.3 busasshen turmi mai gauraya
Yawancin lokaci ana ƙara HPMC zuwa busasshen turmi mai gauraya don inganta aikin gininsa. Tasirin kauri na HPMC yana ƙara dankowar turmi, yana sauƙaƙa yin amfani da shi da matakin yayin gini, kuma yana tsawaita lokacin saiti, yana baiwa ma'aikatan ginin isasshen lokaci don yin gyare-gyare.
5. Abubuwan da suka shafi lokacin saita siminti ta HPMC
5.1 adadin ƙari na HPMC
Adadin da aka ƙara na HPMC shine maɓalli mai mahimmanci da ke shafar lokacin saita siminti. Gabaɗaya, mafi girman adadin HPMC da aka ƙara, mafi ƙaranci tsawaita lokacin saita siminti. Wannan shi ne saboda ƙarin kwayoyin HPMC na iya rufe ƙarin sassan siminti da kuma hana halayen hydration.
5.2 Nauyin kwayoyin halitta na HPMC
HPMC na nau'ikan ma'auni daban-daban yana da tasiri daban-daban akan saita lokacin siminti. HPMC tare da babban nauyin kwayoyin halitta yawanci yana da tasiri mai ƙarfi mai ƙarfi da ƙarfin riƙe ruwa, don haka yana iya tsawaita lokacin saitin sosai. Ko da yake HPMC tare da ƙananan nauyin kwayoyin halitta kuma na iya tsawaita lokacin saitin, tasirin yana da rauni.
5.3 Yanayin muhalli
Yanayin zafi da zafi kuma zai shafi tasirin HPMC akan lokacin saita siminti. A cikin yanayin zafi mai girma, ana haɓaka halayen siminti hydration, amma dukiyar riƙe ruwa na HPMC tana rage wannan tasirin. A cikin ƙananan yanayin zafi, hydration dauki kanta yana jinkirin, kuma kauri da tasirin ruwa na HPMC na iya haifar da saitin siminti ya tsawaita sosai.
5.4 Ruwa-ciminti rabo
Canje-canje a cikin rabon siminti na ruwa kuma zai shafi tasirin HPMC akan lokacin saita siminti. A mafi girman rabon siminti na ruwa, akwai ƙarin ruwa a cikin man siminti, kuma tasirin riƙewar ruwa na HPMC na iya yin ƙarancin tasiri akan lokacin saitawa. A ƙananan rabon siminti na ruwa, tasirin kauri na HPMC zai kasance a bayyane, kuma tasirin tsawaita lokacin saitin zai zama mafi mahimmanci.
A matsayin mahimmin ƙari na siminti, HPMC yana tasiri sosai akan saita lokacin siminti ta hanyoyi daban-daban kamar su kauri, riƙe ruwa, da jinkirta amsawar hydration. Aikace-aikacen HPMC na iya tsawaita lokacin saitin farko da na ƙarshe na siminti, samar da tsawon lokacin aikin gini, da haɓaka aikin tushen siminti. A aikace aikace, abubuwa kamar adadin adadin HPMC da aka ƙara, nauyin kwayoyin halitta, da yanayin muhalli tare suna ƙayyade takamaiman tasirin sa akan lokacin saita siminti. Ta hanyar daidaita waɗannan abubuwan a hankali, ana iya samun daidaitaccen sarrafa lokacin saita siminti don biyan bukatun ayyukan gine-gine daban-daban.
Lokacin aikawa: Juni-21-2024