Ixesha lokumisela ikhonkrithi yiparameter ebalulekileyo echaphazela umgangatho wokwakha kunye nenkqubela phambili. Ukuba ixesha lokumisela lide kakhulu, kunokukhokelela kwinkqubela phambili ecothayo kunye nokonakalisa umgangatho wokuqina wekhonkrithi; ukuba ixesha lokumisela lifutshane kakhulu, kunokukhokelela kubunzima bokwakhiwa kwekhonkrithi kunye nokuchaphazela umphumo wokwakha weprojekthi. Ukuze ulungelelanise ixesha lokumisela ikhonkrithi, ukusetyenziswa kwe-admixtures kuye kwaba yindlela eqhelekileyo kwimveliso yekhonkrithi yanamhlanje.I-Hydroxyethyl Methyl Cellulose (HEMC), njenge-derivative modified cellulose derivative, isetyenziswa ngokubanzi kwi-concrete admixtures kwaye inokuchaphazela i-rheology, ukugcinwa kwamanzi, ixesha lokubeka kunye nezinye iimpawu zekhonkrithi.1. Iimpawu ezisisiseko ze-HEMC
I-HEMC yi-cellulose eguquliweyo, edla ngokwenziwa kwi-cellulose yendalo ngokusebenzisa i-ethylation kunye ne-methylation reactions. Inokunyibilika kakuhle kwamanzi, ukuqina, ukugcinwa kwamanzi kunye neempawu ze-gelling, ngoko ke isetyenziswa ngokubanzi ekwakhiweni, iingubo, iikhemikhali zemihla ngemihla kunye nezinye iindawo. Kwikhonkrithi, i-HEMC idla ngokusetyenziswa njenge-thickener, i-agent yokugcinwa kwamanzi kunye ne-rheology control agent, enokuphucula ukusebenza kwekhonkrithi, ukwandisa ukunamathela kunye nokwandisa ixesha lokumisela.
2. Impembelelo ye-HEMC kwixesha lokumisela ikhonkrithi
Ukulibazisa ixesha lokumisela
Njengoko i-cellulose derivative, i-HEMC iqulethe inani elikhulu lamaqela e-hydrophilic kwisakhiwo sayo se-molecular, esinokusebenzisana nama-molecule amanzi ukwenza i-hydrates ezinzileyo, ngaloo ndlela ilibazise inkqubo ye-cement hydration ukuya kwinqanaba elithile. I-hydration reaction ye-samente yindlela ephambili yokuqinisa ikhonkrithi, kwaye ukongezwa kwe-HEMC kunokuchaphazela ixesha lokumisela ngeendlela ezilandelayo:
Ukugcinwa kwamanzi okuphuculweyo: I-HEMC inokuphucula kakhulu ukugcinwa kwamanzi kwikhonkrithi, icothise izinga lokunyuka kwamanzi, kwaye yandise ixesha lokuphendula kwe-cement hydration. Ngokugcina amanzi, i-HEMC inokuphepha ukulahlekelwa kwamanzi amaninzi, ngaloo ndlela ilibazise ukwenzeka kokumiselwa kokuqala kunye nokugqibela.
Ukunciphisa ukushisa kwe-hydration: I-HEMC inokuthintela ukungqubana kunye nokuphendula kwe-hydration yeengqungquthela ze-samente ngokunyusa i-viscosity yekhonkrithi kunye nokunciphisa isantya sokuhamba kweengqungquthela ze-samente. Iqondo eliphantsi lokugalela amanzi linceda ukulibazisa ixesha lokubeka ikhonkrithi.
Ukulungelelaniswa kwe-Rheological: I-HEMC inokulungelelanisa iimpawu ze-rheological zekhonkrithi, ikhulise i-viscosity yayo, kwaye igcine intlama yekhonkrithi kwi-fluidity enhle kwisigaba sokuqala, ukuphepha ubunzima bokwakha obubangelwa ku-coagulation ngokugqithiseleyo.
Imiba enempembelelo
Isiphumo seHEMCngexesha lokumisela alihambelani ngokusondeleyo kuphela kwidosi yayo, kodwa ikwachatshazelwa zezinye izinto zangaphandle:
Ubunzima be-molecular kunye neqondo lokutshintshwa kwe-HEMC: I-molecular weight and degree of substitution (i-degree of substitution of ethyl kunye ne-methyl) ye-HEMC inempembelelo enkulu ekusebenzeni kwayo. I-HEMC enobunzima obuphezulu be-molecular kunye neqondo eliphezulu lokutshintshwa ngokuqhelekileyo linokwenza isakhiwo sothungelwano esomeleleyo, esibonisa ukugcinwa kwamanzi angcono kunye neempawu zokuqina, ngoko ke ukulibaziseka kwexesha lokumisela kubaluleke kakhulu.
Uhlobo lwesamente: Iindidi ezahlukeneyo zesamente zinemilinganiselo eyahlukeneyo ye-hydration, ngoko ke umphumo we-HEMC kwiinkqubo ezahlukeneyo zesamente nazo zihluke. I-samente ye-Portland eqhelekileyo inesantya esikhawulezayo se-hydration, ngelixa i-samente ephantsi kwe-heat-heat okanye i-samente ekhethekileyo inesantya esincinci se-hydration, kwaye indima ye-HEMC kwezi nkqubo ingaba yinto evelele ngakumbi.
Iimeko zokusingqongileyo: Iimeko zokusingqongileyo ezifana nobushushu kunye nomswakama zinempembelelo ebalulekileyo kwixesha lokubeka ikhonkrithi. Ukushisa okuphezulu kuya kukhawulezisa ukusabela kwe-hydration ye-samente, okubangelwa ixesha elifutshane lokumisela, kwaye umphumo we-HEMC kwiindawo eziphezulu zokushisa unokuba buthathaka. Ngokuchasene noko, kwiindawo zokushisa eziphantsi, umphumo wokulibaziseka we-HEMC unokubonakala ngakumbi.
Ugxininiso lwe-HEMC: Uxinzelelo lwe-HEMC lumisela ngokuthe ngqo iqondo lempembelelo yayo kwikhonkrithi. Uxinzelelo oluphezulu lwe-HEMC lunokwandisa kakhulu ukugcinwa kwamanzi kunye ne-rheology yekhonkrithi, ngaloo ndlela ukulibazisa ngokufanelekileyo ixesha lokumisela, kodwa ukugqithisa kwe-HEMC kunokubangela ukungahambi kakuhle kwekhonkrithi kunye nokuchaphazela umsebenzi wokwakha.
Impembelelo ye-Synergistic ye-HEMC kunye nezinye ii-admixtures
I-HEMC idla ngokusetyenziswa kunye nezinye i-admixtures (ezifana nabanciphisi bamanzi, i-retarders, njl.) Ukulungelelanisa ngokubanzi ukusebenza kwekhonkrithi. Ngentsebenziswano yabacuphi, isiphumo sokulibaziseka sokumisela kwe-HEMC sinokwandiswa ngakumbi. Ngokomzekelo, impembelelo ye-synergistic ye-retarders ethile efana ne-phosphates kunye ne-sugar admixtures kunye ne-HEMC inokwandisa ngokuphawulekayo ixesha lokubeka ikhonkrithi, efanelekileyo kwiiprojekthi ezikhethekileyo kwiindawo ezishushu okanye ezifuna ixesha elide lokwakha.
3. Ezinye iimpembelelo zeHEMC kwiipropati eziphathekayo
Ukongeza kokulibazisa ixesha lokumisela, i-HEMC nayo inefuthe elibalulekileyo kwezinye iipropati zekhonkrithi. Ngokomzekelo, i-HEMC inokuphucula i-fluidity, i-anti-segregation, ukusebenza kokupompa kunye nokuqina kwekhonkrithi. Ngelixa ulungelelanisa ixesha lokumisela, ukuqina kunye nokugcinwa kwamanzi kwi-HEMC kunokuthintela ngokufanelekileyo ukuhlukana okanye ukuphuma kwegazi kwikhonkrithi, kunye nokuphucula umgangatho jikelele kunye nokuzinza kwekhonkrithi.
I-Hydroxyethyl methylcellulose (HEMC) inokulibazisa ngokufanelekileyo ixesha lokubeka ikhonkrithi ngokugcinwa kakuhle kwamanzi, ukuqina kunye nemiphumo yokulawula i-rheological. Iqondo lefuthe le-HEMC lichaphazeleka yimiba enjengobunzima bayo bemolekyuli, idigri yokutshintshwa, uhlobo lwesamente, indibaniselwano ye-admixture kunye neemeko zokusingqongileyo. Ngokulawula ngokufanelekileyo i-dosage kunye nomlinganiselo we-HEMC, ixesha lokumisela linokwandiswa ngokufanelekileyo ngelixa liqinisekisa ukusebenza kokwakhiwa kwekhonkrithi, kunye nokusebenza kunye nokuqina kwekhonkrithi kunokuphuculwa. Nangona kunjalo, ukusetyenziswa ngokugqithisileyo kwe-HEMC kunokuzisa iziphumo ezibi, ezifana nokungaphumeleli kwamanzi okanye ukugqithiswa okungagqibekanga, ngoko kufuneka kusetyenziswe ngononophelo ngokweemfuno zobunjineli bokwenyani.
Ixesha lokuposa: Nov-21-2024