Fly Ash Portland Cement

Portland Cement
ya tshauvportland cement yog hais txog kev sib xyaw ntawm Portland cement clinker thiab ya tshauv, tov nrog ib qho tsim nyog ntawm gypsum thiab tom qab ntawd hauv av, codenamed PF Txhua yam hydraulic cementitious khoom ua los ntawm Portland cement clinker, ya tshauv thiab qhov tsim nyog ntawm gypsum av yog hu ua ya tshauv. Portland cement, codenamed PF Tus nqi ntawm ya tshauv ntxiv rau cov cement yog 20% ​​~ 40% los ntawm huab hwm coj, thiab nws cov qib zog thiab lub zog xav tau ntawm txhua lub hnub nyoog yog tib yam li cov slag Portland cement.

Cov khoom nyoos
Nws yog ua los ntawm Portland cement clinker thiabya tshauv , sib tov nrog ib tug tsim nyog tus nqi ntawm gypsum thiab ces av. Code PF
Txhua yam khoom siv hydraulic cementitious ua los ntawm Portland cement clinker, ya tshauv thiab qhov tsim nyog ntawm gypsum av yog hu ua ya tshauv Portland cement, codenamed PF Cov nyiaj tshauv ya ntxiv rau cov cement yog 20% ​​mus rau 40% los ntawm huab hwm coj. Nws raug tso cai los koom rau hauv lub qhov cub tawg granulated slag tsis pub tshaj 1/3 ntawm tag nrho cov khoom sib xyaw. Lub sijhawm no, tag nrho cov khoom sib xyaw tuaj yeem ncav cuag 50%, tab sis cov hmoov tshauv ya yuav tsum tsis pub tsawg dua 20% lossis ntau dua 40%.
Nta
Tus qauv ntawm ya ntuj Asment yog qhov tseem ceeb, muaj peev xwm ua kom me me, thiab cov kua dej kom qhuav, thiab cov dej qhuav los yog qhov me me xwb, thiab qhov tawg kuj tsis tshua muaj. zoo. Tsis tas li ntawd, zoo ib yam li cov cement sib xyaw nrog cov khoom sib xyaw ua ke, nws muaj cov dej tsis tshua muaj cua sov thiab muaj zog corrosion kuj.
Kev ua tau zoo
Cov khoom tshwj xeeb ntawm ya tshauv Portland cement yog raws li hauv qab no:
(1) Lub zog thaum ntxov yog qis, thiab lub zog lig nce tus nqi yog loj: lub zog thaum ntxov ntawm ya tshauv cement yog tsawg, thiab thaum ntxov lub zog txo qis nrog qhov nce ntawm ya tshauv cov ntsiab lus. Vim tias lub cev vitreous hauv cov tshauv ya ya yog qhov ruaj khov heev, cov hmoov tshauv ya ya tau yaig thiab rhuav tshem qeeb heev los ntawm Ca (OH) 2 thaum lub sij hawm hydration ntawm ya tshauv cement, yog li kev txhim kho lub zog ntawm ya tshauv cement feem ntau tshwm sim tom qab. theem. , nws lig zog nce tus nqi yog loj, thiab nws muaj peev xwm txawm tshaj lub lig zog ntawm cov coj Portland cement.
(2) Kev ua haujlwm zoo thiab me me qhuav shrinkage: Vim tias feem ntau ntawm cov hmoov tshauv ya tau raug kaw thiab cov khoom kheej kheej, thiab thaj chaw sab hauv thiab cov dej adsorption ib leeg me me, cov yoov tshauv cement muaj kev ua haujlwm zoo thiab me me qhuav shrinkage. , muaj cov yam ntxwv ntawm siab tensile lub zog thiab zoo tawg kuj. Qhov no yog qhov tseeb kom zoo dua ntawm ya tshauv cement.
(3) Zoo corrosion kuj: ya tshauv cement muaj siab corrosion kuj rau dej tshiab thiab sulfate. Vim yog kev sib xyaw ua ke ntawm SiO2 nquag hauv cov tshauv ya thiab Ca (OH) 2, calcium silicate hydrate yog tsim thaum sib npaug. Qhov yuav tsum tau txwv qhov concentration (piv txwv li cov kua theem alkalinity) qis dua qhov yuav tsum tau rau qhov sib npaug ntawm calcium silicate hydrate hauv Portland cement zoo tib yam, yog li cov leaching tus nqi hauv cov dej tshiab tau txo qis, yog li txhim kho cov cement kuj. Cov dej tshiab corrosion muaj peev xwm thiab tiv thaiv sulfate puas.
(4) Tsawg tshav kub ntawm hydration: Lub hydration ceev ntawm ya tshauv cement yog qeeb thiab cov cua sov ntawm hydration yog tsawg, tshwj xeeb tshaj yog thaum tus nqi ntawm ya tshauv ntxiv yog loj, txo cov cua sov ntawm hydration yog pom tseeb heev.

Portland cement
Tag nrho Portland cement clinker feem ntau yog tsim los ntawm calcium silicate, limestone los yog granulated blast furnace slag nrog tsawg dua 5%, thiab hydraulic cementitious khoom ua los ntawm finely av gypsum yog collectively hu ua Portland cement. Thoob ntiaj teb sib sau ua ke hu ua Portland Cement.
Kev faib tawm
Portland cement muab faib ua ob hom, hom I Portland cement tsis muaj cov khoom sib xyaw hu ua Portland cement, code P·I; cov khoom sib xyaw nrog limestone lossis granulated blast furnace slag tsis pub tshaj 5% ntawm cov cement loj yog hu ua II Type Portland cement, code P·Ⅱ.
Mineral muaj pes tsawg leeg
Lub ntsiab ntxhia hauv Portland cement yog: tricalcium silicate, dicalcium silicate, tricalcium aluminate, thiab tetracalcium ferric aluminate. Tricalcium silicate txiav txim siab lub zog ntawm Portland cement hauv plaub lub lis piam; dicalcium silicate tsuas yog siv nws lub zog tom qab plaub lub lis piam, thiab ncav cuag lub zog ntawm tricalcium silicate rau plaub lub lis piam hauv ib xyoos; lub zog ntawm tricalcium aluminate Nws exerts sai, tab sis lub zog yog tsawg, thiab nws plays ib tug tej yam lub luag hauj lwm nyob rau hauv lub zog ntawm Portland cement nyob rau hauv 1 mus rau 3 hnub los yog ntev dua me ntsis; Lub zog pab ntawm acid ntsev cement yog me me.