Pozzolanic MAAs yog cov khoom siv hmoov nrog astringent zog, nws yog raws li clinker nrog ntau yam additives. Qhov loj tau txais cov qauv yas thaum sib cuag nrog dej thiab tawv thaum ziab.
Production
Txiv qaub-pozzolanic cement yog tsim los ntawm cov nroj tsuag tshwj xeeb, kev tsim khoom uas yuav tsum tau ua tiav kev siv tshuab. Qhov sib txawv ntawm cov chaw tsim khoom lag luam no yog tias lawv muaj cov khoom sib tsoo siv rau kev sib tsoo thiab ziab cov khoom ntxiv. Mineral natural tshuaj ua raws li lawv - gliezh, diatomite, kuj tseem siv tau los ntawm cov khoom siv hluav taws xob ntau lawm.
Muaj ntau yam khoom ntxiv hauv cov khoom xws li pozzolanic cement. Qhov sib xyaw thiab qhov sib piv ntawm cov khoom xyaw cuam tshuam rau kev ua haujlwm. Txhawm rau hloov lub sijhawm khov kho thaum lub sij hawm sib tsoo, gypsum yog ntxiv, thaum nws cov nyiaj yuav tsum tsis txhob ntau tshaj 3% ntawm tag nrho.pawg.
qauv
Tag nrho kev sib tsoo, uas yog cov txheej txheem nrov tshaj plaws rau kev tsim cov txiv qaub-pozzolanic cement, muaj qhov tshwj xeeb hauv kev sib tsoo clinker ua ke nrog gypsum thiab ntxhia cov ntsiab lus hauv ib qho tshwj xeeb ntau chav zeb. Ua ntej no, cov khoom xyaw yog crushed thiab coj mus rau qhov yuav tsum tau noo noo theem nyob rau hauv lub tshuab ziab khaub ncaws. Nws yuav tsum raug sau tseg tias qhov nce ntawm qhov sib piv ntawm cov khoom ntxiv pab txo tus nqi ntawm cov khoom siv.
txiv qaub-pozzolanic cement muaj cov txheej txheem hardening uas nkag siab rau qhov kub thiab txias. Thaum kub txog li 14 degrees, qhov sib tov yog tus cwj pwm los ntawm kev ua kom qeeb qeeb. Cov txheej txheem xyaum nres yog tias qhov ntsuas kub ntawm 5 degrees. Vim li no, kev siv cov khoom siv thaum lub caij txias hauv qhov chaw qhib yog qhov nyuaj dua.
Tib lub sijhawm, pozzolanic cement teeb nrawm dua ntawm qhov kub thiab txias ntau dua li niaj zaus Portland cement. Txhawm rau kom ua tau zoo ntawm cov khoom tsim, lawv tuaj yeem raug kho kom sov ntxiv ntawm qhov kub ntawm 80-90 degrees.
pros and cons
Pozzolanic cement, uas nws cov khoom tso cai tsim cov tshuaj xws li calcium hydroaluminate thiab hydrosilicate thaum lub sij hawm solidification, uas tsis tshua muaj zog dua li cov cement zoo tib yam, muab kev tiv thaiv ntau dua rau cov dej ntxhia thiab dej tshiab. Ntawmqhov tsim nyog tsim nyog sau cia hauv qab no:
- pozzolanic cement muaj tsawg qhov tawg;
- qib siab ntawm adhesion nrog cov pob zeb ua kom muaj zog ntxiv;
- yuav yooj yim;
- yam ntxwv khi zoo heev;
- pozzolanic mix forms ntau pob zeb lossis mortar ntawm tib qho khoom siv no thiab sib xyaw ntawm lwm hom.
Tab sis tsis muaj qhov tsis zoo:
- xav tau siv dej ntau ntxiv rau kev sib xyaw;
- ntev cia kom txo tau cov dej num ntawm cov tshuaj muaj.
Yam uas koj yuav tsum paub
Tsis yog ib txoj haujlwm hauv tsev tuaj yeem ua yam tsis muaj cement, thaum Russia tuav txoj haujlwm tseem ceeb hauv kev tsim cov khoom siv no. Ib qho ntawm nws ntau yam nyob rau hauv lawv cov qauv tsim tshuaj muaj nyob rau hauv qeb ntawm silicates, thaum muaj pes tsawg leeg muaj ib tug additive nyob rau hauv daim ntawv ntawm silicon dioxide. Lub hauv paus ntawm cov cement yog clinker, uas muaj cov txiv qaub thiab av nplaum uas tau raug rho tawm haujlwm. Infusor ntiaj teb ua raws li impurity. Tsim thaum lub sij hawm tsim thiab siv, cement plua plav, nrog rau lub sij hawm ntev, ua rau kev loj hlob ntawm bronchitis thiab, nyob rau hauv tsawg zaus, pneumoconiosis, muab hais tias qib ntawm silicon dioxide uas pozzolanic cement muaj ntau tshaj.
Silicosis yog ib hom kab mob pneumoconiosis hnyav heev thiab tau dhau los ua qhov dav tshaj plaws thaum lub sijhawm muaj kev loj hlob ntawm engineering thiab mining vim qhov tseeb tiastias kev ua haujlwm muaj pes tsawg leeg cuam tshuam los ntawm ntau cov hmoov av quartz. Cov kab mob no feem ntau tshwm sim hauv cov neeg koom nrog hauv kev ua cov granite, kev tsim cov tunnels, kev tsim cov ceramic thiab refractory compounds.
Lwm txoj kev tsim khoom
Pozzolanic cement, uas nws cov khoom tseem nyob ntawm cov txheej txheem thev naus laus zis, tuaj yeem tsim tsis tau tsuas yog hauv cov chaw tsim khoom, tab sis kuj tseem nyob ntawm cov chaw tsim kho lawv tus kheej siv kev sib tsoo thiab ziab cov nroj tsuag. Mineral additives yog qhuav nyob rau hauv lawv, hauv av thiab tov nrog lub ntsiab loj, nws yog ib qhov ua tau rau ib txhij zom tag nrho cov khoom xyaw. Vim li no, kev tsheb khiav ceev raug txo, tsuas yog clinker thauj, thiab cov ntxhia hauv lawv tus kheej raug mined hauv cheeb tsam kev tsim kho. Ntawm qhov zoo ntawm cov txheej txheem no, nws tsim nyog sau cia qhov muaj peev xwm ntawm kev hloov pauv ntawm cov khoom siv tshiab tshiab uas siv cov fillers. Tab sis kev siv cov kev teeb tsa tshwj xeeb tsuas yog tsim nyog rau kev tsim kho ntau.
Pozzolanic cement: daim ntawv thov
Cov khoom siv tau dhau los ua qhov dav tshaj plaws hauv kev tsim cov pob zeb thiab cov khoom ua vaj tse rau hauv av thiab hauv qab dej, uas cuam tshuam nrog sulfate thiab dej tshiab. Nws tuaj yeem siv rau mortars thiab cov qauv tsim, cov xwm txheej ambient uas yog tus cwj pwm los ntawm qib siab ntawm cov av noo. Nws kuj tseem siv dav hauv cov qauv hydraulic ua ib feem ntawm cov pob zeb sib xyaw.
Siv hauv cov qauv hauv av tsuas yog txwv vim cov yam ntxwv tsis muaj te, tshwj xeeb tshaj yog nyob rau hauv huab cua kho. Qhov no yog qhov ncaj ncees los ntawm kev ziab sai, uas tuaj yeem nres cov txheej txheem curing thiab ua rau muaj kev cuam tshuam loj. Nws tseem yog qhov tsis tsim nyog los tsim cov qauv tsim los ntawm pozzolanic cement yog tias lawv tau ua haujlwm nyob rau hauv cov xwm txheej ntawm lub sijhawm thawing thiab khov, ziab thiab moistening.
Txoj Kev
Pozzolanic cement, muaj pes tsawg leeg, cov khoom siv, kev siv uas muab lub zog sib txawv ntawm cov khoom tiav, ruaj khov, qhov no yog vim muaj cov calcium hydrosilicate tsim. Cov khoom siv yog tus cwj pwm los ntawm kev nce mus sij hawm ntev hauv lub zog vim qhov txo qis ntawm tag nrho cov cement ntshiab, nws yog txhua yam hais txog cov khoom xyaw ntxiv. Hardening acceleration yog sau tseg thaum calcium oxide hydrate thiab nquag silica cuam tshuam, vim li ntawd, cov khoom tau txais lub zog zoo ib yam li lwm cov cement mortars. Yog li ntawd, yuav tsum nyob twj ywm nyob rau hauv ib qho chaw ntub dej ntev dua.
dej xav tau
Pozzolanic cement, uas yog raws li diatomites thiab tripoli, yog tus cwj pwm los ntawm kev xav tau dej ntau ntxiv, ua rau muaj kev poob qis hauv qhov pib ntawm qhov kawg hardening. Rau kev tsim cov cement paste, qhov xav tau ntawm cov kua kuj nce ntxiv nyob ntawm cov ntxhia nquag siv. Nws qhov txo qis yog sau tseg nyob rau hauv lub xub ntiag ntawm tuff thiab trass nyob rau hauv lub composition.
TxhawbKev thov dej yog qhov tsis xav tau vim tias nws ua rau muaj kev noj ntau dua ntawm cov cement ntawm hom no piv rau lwm tus. Qhov sib ntxiv ntawm cov tshauv ya ya tsis hloov qhov sib xyaw ua kua uas xav tau. Nws tuaj yeem sib tov ob qho tib si nrog cov pob zeb sib xyaw thiab nrog cov cement nws tus kheej. Nyob rau tib lub sijhawm, qhov zoo ntawm cov khoom tsis txo qis, txawm tias ib feem ntawm nws hloov nrog tshauv.
