Kev txiav txim siab rau tus kheej (SCC) yog lub tshuab ua si niaj hnub uas ntws hauv nws tus kheej hnyav los sau cov formwork yam tsis muaj kev siv tshuab tshuab kev co. Nws cov txiaj ntsig suav nrog kev txhim kho cov nqi zog, txo cov nqi ua haujlwm, thiab txhim kho cov qauv kev ua tau zoo. Ua tiav cov yam ntxwv no yuav tsum tau ua kom tiav ntawm cov sib tov, ntau zaus nrog kev pab ntawm Insixtures zoo li HydroxyPropylulose (HPMC). Qhov no cellulose ether plays Lub luag haujlwm tseem ceeb hauv kev kho cov khoom ntawm SCC, txhim kho nws cov yam ruaj khov thiab ntws yam.
Cov Khoom Siv thiab Cov Haujlwm Ntawm HPMC
HydroxyPropyyl Metylcellulose (HPMC) yog cov tsis-ionic, dej-soluble polymer muab tau los ntawm cellulose. Nws cov khoom tseem ceeb suav nrog:
Viscosity Transpification: HPMC tsub visccosity ntawm cov kua aqueous, txhim kho lub thixotropic xwm ntawm cov pob zeb sib xyaw.
Dej khaws cia: Nws muaj cov peev txheej khiav dej zoo heev, uas pab tswj cov haujlwm ua haujlwm ntawm cov pob zeb ua los ntawm kev txo cov dej evaping.
Adhesion thiab Cohesion: HPMC txhim kho txoj kev sib txuas ntawm cov sib txawv ntawm cov pob zeb sib txawv hauv cov pob zeb ua, txhim kho nws cov khoom siv cohesive.
Kev hloov kho ruaj khov: Nws tso cai rau kev ncua ntawm kev sib cais hauv cov sib xyaw, txo kev cais tawm thiab los ntshav.
Cov khoom no ua HPMC muaj txiaj ntsig ntxiv hauv SCC, vim tias nws nyob nrog kev sib tw xws li los ntshav, thiab tswj cov kev xav uas tsis muaj kev ruaj khov tsis muaj kev ruaj khov.
Lub luag haujlwm ntawm HPMC hauv kev sib xyaw ua ke rau tus kheej
1. Kev txhim kho ntawm kev ua haujlwm
Cov haujlwm tseem ceeb ntawm HPMC hauv SCC yog los txhim kho nws txoj haujlwm los ntawm kev ua kom muaj kev sib xyaw ua ke. Qhov kev hloov kho no tso cai rau SCC kom ntws tau yooj yim hauv nws tus kheej qhov hnyav thiab ua tiav qib siab ntawm kev sib cav tsis muaj kev vibration. HPMC kom ntseeg tau tias cov pob zeb nyob tsis ua haujlwm tau ntev ntev, uas yog qhov muaj txiaj ntsig tshwj xeeb rau cov loj lossis cov khoom sib xyaw.
Flowerabiles: HPMC pab txhawb rau kev sib xyaw ua ke ntawm cov khoom siv thixotropic, tso cai rau cov kua thaum sib xyaw ua ke thaum sawv. Tus cwj pwm no txhawb nqa tus cwj pwm tus kheej, kom nws cov kab mob uas tsis muaj kev sib cais.
LAG LUAM: Los ntawm kev tswj lub viscosity, HPMC pab tswj cov kev sib txuas ib puag ncig thoob plaws cov mix, kom txhua pob ntawm SCC cov khoom ua kom haum rau hauv cov ndlwg thiab ruaj khov.
2. Subration thiab los ntshav tswj
Segregation (kev sib cais ntawm cov sib xyaw ua ke los ntawm Maas paste) thiab los ntshav (dej nce rau saum npoo) yog kev txhawj xeeb tseem ceeb hauv SCC. Cov xwm txheej no tuaj yeem cuam tshuam cov qauv kev ncaj ncees thiab kev ua tiav saum npoo ntawm cov pob zeb.
Homogeneous Mix: HPMC muaj peev xwm nce cov viscosity ntawm cov cement muab minimizes kev txav mus los ntawm dej thiab aggregates, yog li txo txoj kev pheej hmoo ntawm cais.
Txo cov ntshav: los ntawm cov dej tawm hauv kev sib tov, HPMC pab tiv thaiv kom ntshav. Qhov kev khaws cia hauv cov dej no tseem ua kom pom tseeb tias cov txheej txheem hydration txuas ntxiv tau zoo, txhim kho lub zog txhim kho thiab lub zog ntawm cov pob zeb ua.
3. Txhim Kho Kev Ruaj Ntseg
HPMC pab txhawb rau kev ruaj ntseg ntawm SCC los ntawm kev txhim kho cov cohesion ntawm cov khoom hauv cov sib tov. Qhov kev ruaj ntseg txhim kho yog qhov tseem ceeb hauv kev tswj hwm cov kev faib tsis sib xws ntawm kev sib sau ua ke thiab tiv thaiv kev tsim ntawm voids lossis cov pob tsis muaj zog.
Cohesion: tus nplaum ntawm HPMC txhawb nqa txoj kev sib txuas zoo ntawm cov Maas hais thiab cov keyog, ua rau muaj kev sib xyaw ua ke tiv thaiv kab mob sib cais.
Stabilizes: HPMC stabilizes micrmc stabiling micrivchure ntawm cov pob zeb ua, tso cai rau kev tsim cov laitance (ib qho tsis muaj zog txheej ntawm cov xis thiab cov khoom zoo ntawm cov npoo).
Nyhuv rau cov khoom siv hauv cov tshuab
1. Compressive Lub Zog
Tus HPMC ntawm lub zog compressive ntawm SCC feem ntau zoo. Los ntawm kev tiv thaiv kev sib cais thiab ua kom muaj kev sib xyaw homogeneous, HPMC pab tswj kev ncaj ncees ntawm cov tswv yim ntawm Micregtructure, ua kom muaj zog zoo dua.
Hydration: Txhim kho dej ceev ceev kom ntau dua cov dej haus ntawm cov Maas hais tawm, ua rau muaj kev txhim kho ntawm lub zog muaj zog.
Cov khaub thuas sib txawv: kev tiv thaiv ntawm kev faib tawm hauv kev sib koom ua ke ntawm kev sib koom tes, uas txhawb kev pheej hmoo ntawm cov ntsiab lus tsis muaj zog.
2. Lub Neej
Kev siv HPMC hauv SCC txhim kho nws txoj kev ua kom ruaj khov los ntawm kev ua kom nruj thiab ntau homogenous microstructure.
Txo cov permeability: txhim kho cohesion thiab txo qis los ntshav tsawg dua rau cov pob zeb ua kom zoo li cov khoom siv khov, kev tawm tsam khov, thiab carbonation.
Txhim kho saum npoo tiav: kev tiv thaiv kev los ntshav thiab cais cov smoother thiab ntau ruaj ruaj saum npoo, uas tsis tshua muaj kev tawg thiab ntsuas.
Daim Ntawv Thov thiab Cov Nqi Feem Txiav
Qhov kev ua tau zoo ntawm HPMC hauv SCC nyob ntawm nws qhov kev siv tshuaj thiab cov kev xav tau ntawm cov kev sib xyaw. Kev Dosage Rates ntau li cas los ntawm 0.1% rau 0.5% ntawm cov xis mas txoj kev ntshaw, nyob ntawm cov khoom xav tau thiab cov yam ntxwv ntawm lwm yam hauv kev sib xyaw.
Mix Tsim: Ceev faj Sib Txawv Tsim yog qhov tseem ceeb rau kev ua kom cov txiaj ntsig ntawm HPMC. Yam khoom xws li hom kev sib sau ua ke, cov ntsiab lus siv xiss, thiab lwm yam admixtures yuav tsum raug txiav txim siab qhov ua haujlwm ntawm kev ua haujlwm, ruaj khov, thiab lub zog.
Kev sib txuam: HPMC yuav tsum sib xws nrog lwm tus admixtures siv, xws li superplasticizers thiab cov dej reducers, kom tsis txhob cuam tshuam kev sib cuam tshuam uas tuaj yeem ua rau muaj kev cuam tshuam zoo ntawm SCC.
HydroxyPropyyl methylcellueculose (HPMC) plays lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm tus kheej-compacting qhob (SCC). Nws lub peev xwm los hloov viscosity, txhim kho kev sib tw kom muaj kev sib tw tseem ceeb hauv src kev cov nyom, suav nrog kev sib cais, thiab tswj hwm kev kub. Kev koom tes ntawm HPMC hauv SCC cov txiaj ntsig hauv kev ua haujlwm tau zoo, ruaj khov, thiab siv tau pob zeb ua pob zeb ua kom sib xyaw rau cov ntawv thov niaj hnub no. Kev tsim nyog noj tshuaj thiab kev sib xyaw ua ke yog qhov tseem ceeb rau cov txiaj ntsig ntawm HPMC, kom ntseeg tau tias daim SCC yuav tsum muaj cov qauv kev tsim kho tshwj xeeb.
Lub Sijhawm Post: Jun-18-2024