Corrosion zog thiab kev faib ua feem ntawm pob zeb

Corrosion Resistance

Pob zeb yog cov khoom siv ruaj khov, tab sis nws yog ib qho khoom siv tsis sib xws. Nws yog inevitably cuam tshuam thiab corroded los ntawm lwm yam xws li carbon dioxide, dej, chloride ions, thiab sulfates, uas accelerates nws deterioration thiab ho txo ​​nws cov kev pab cuam lub neej.

Ntsev CrystallizationThaum cov pob zeb nkag mus rau hauv kev sib cuag nrog cov dej uas muaj ntau cov ntsev ntsev sib txuas, cov ntsev no nkag mus rau hauv cov pob zeb. Raws li cov dej evaporates, cov ntsev tsis tu ncua mloog zoo hauv cov pob zeb thiab nws thiaj li crystallize. Cov txheej txheem crystallization no feem ntau nrog ntim nthuav dav, ua rau cov pob zeb tawg thiab deteriorate. Sulfate corrosion yog ib qho piv txwv. Hauv kev siv cov khoom siv pob zeb, feem ntau hom tshuaj corrosion yog sulfate corrosion. Sulfates hnov ​​​​mob nrog calcium aluminates hauv cov cement los ua ettringite expansive, ua rau tawg hauv pob zeb. Qhov no cracking ntxiv accelerates corrosion ntawm cov pob zeb matrix los ntawm sulfates.

EflorescenceThaum noo noo tuaj yeem tawm ntawm qhov chaw ua vaj tse, efflorescence ib txwm tshwm rau ntawm qhov chaw. Cov ntsev no tawm ntawm cov pob zeb, crystallizing tom qab cov dej evaporates, los yog reacting nrog carbon dioxide nyob rau hauv cov huab cua los tsim muaju. Qhov no qhia tau hais tias tseem ceeb seepage nyob rau hauv lub pob zeb, uas tsub kom porosity, yog li txo lub zog ntawm lub pob zeb txheej thiab ua rau nws susceptibility rau erosive tebchaw.

Acid thiab Alkali CorrosionPob zeb yog cov khoom siv alkaline thiab feem ntau tsis raug kev txom nyem los ntawm alkali corrosion. Txawm li cas los xij, nyob rau hauv cov nroj tsuag tshuaj, lub sij hawm ntev raug rau siab concentrations alkaline tshuaj kuj tuaj yeem ua rau cov khoom ua vaj tse puas. Pob zeb muaj zog tiv thaiv acids. Piv txwv li, carbonic acid reacts nrog calcium hydroxide los tsim calcium bicarbonate soluble. Yog li ntawd, carbonic acid ho corrodes pob zeb, piav qhia yog vim li cas carbon dioxide nyob rau hauv cov huab cua corrodes pob zeb cov ntaub ntawv.

Basic Classification

Cov khoom siv cementitious

Inorganic Cementitious Material Concrete: Qhov no suav nrog cov kua qaub-silicate cementitious pob zeb (xws li silicate pob zeb), silicate cement-based pob zeb (xws li silicate cement, zoo tib yam cement, slag cement, ya tshauv cement, pozzolanic cement, thaum ntxov zog cement pob zeb, thiab lwm yam), calcium aluminate cement-based pob zeb (xws li siab alumina cement, ntshiab aluminate cement, shotcrete, ultra-ceev hardening cement pob zeb, thiab lwm yam), gypsum pob zeb, magnesium cement pob zeb, sulfur pob zeb, dej iav sodium fluorosilicate pob zeb, thiab hlau pob zeb (siv hlau. raws li cov khoom siv cementitious).

Organic Cementitious Material Concrete: Qhov no feem ntau suav nrog asphalt pob zeb, polymer cement pob zeb, cob pob zeb, polymer-impregnated pob zeb, thiab inorganic-organic composite cementitious khoom ua vaj tse, uas tuaj yeem muab faib ntxiv rau hauv polymer cement pob zeb thiab polymer pob zeb.

Pom NtsigCov pob zeb tuaj yeem raug cais los ntawm qhov pom meej meej rau hauv: pob zeb hnyav, pob zeb zoo tib yam, thiab cov pob zeb sib sib zog nqus. Cov hom no txawv tsuas yog los ntawm cov aggregates siv.

Heavy pob zeb: Nrog rau qhov pom tseeb ntom ntom ntau dua 2500 kg / m³, ua nrog tshwj xeeb ntom ntom thiab hnyav aggregates, xws li barite pob zeb thiab steel aggregate pob zeb. Cov hom no tuaj yeem thaiv X-rays thiab gamma rays thiab feem ntau yog npaj nrog barite thiab hlau ore.

Ordinary pob zeb: Feem ntau siv hauv kev tsim kho, nrog qhov pom tseeb ntawm 1950-2500 kg / m³, feem ntau npaj nrog xuab zeb thiab pob zeb sib sau ua ke. Nws yog hom siv ntau tshaj plaws hauv civil engineering.

Lub teeb yuag: Nrog qhov pom tseeb qhov ceev tsawg dua 1950 kg / m³, ntxiv muab faib ua peb pawg:

Lub teeb Aggregate Qhob: Nrog rau qhov pom tseeb qhov ceev ntawm 800-1950 kg / m³, siv lub teeb aggregates xws li pumice, volcanic cinders, nthuav av nplaum, nthuav perlite, nthuav slag, thiab slag.

Aerated Concrete (ua npuas ncauj, Aerated Concrete): Nrog rau qhov pom tseeb ntawm 300-1000 kg / m³. Ua npuas ncauj yog ua los ntawm cov cement paste lossis cement mortar thiab ua npuas ncauj ruaj khov. Aerated qhob yog tsim los ntawm cov cement, dej, thiab cov neeg ua haujlwm aerating.

Loj-Pore Concrete: Ordinary loj-pore pob zeb thiab lub teeb yuag aggregate loj-pore pob zeb tsis muaj nplua aggregates. Ordinary loj-pore pob zeb muaj qhov ntom ntom ntawm 1500-1900 kg / m³ thiab yog ua los ntawm cov pob zeb crushed, pob zeb mos, los yog hnyav slag li aggregates. Lub teeb yuag aggregate loj-pore pob zeb muaj qhov ntom ntom ntawm 500-1500 kg / m³ thiab yog tsim nrog cov sib xyaw xws li nthuav av nplaum, pumice, crushed cib, thiab slag.

Los ntawm Quota

Ordinary pob zeb: Muab faib rau hauv cov pob zeb zoo tib yam semi-qhuav nyuaj, cov twj tso kua mis zoo tib yam, thiab cov pob zeb hauv qab dej, txhua qhov ntxiv muab faib ua pob zeb pob zeb thiab pebble pob zeb.

Frost-Resistant Qhob: Muab faib ua Frost-resistant semi-dry hard pob zeb thiab Frost-resistant pumped qhob, txhua ntxiv muab faib ua crushed pob zeb pob zeb thiab pebble pob zeb.

Los ntawm FunctionCov pob zeb tuaj yeem raug cais los ntawm kev ua haujlwm rau hauv cov pob zeb ua vaj tse, thermal rwb thaiv tsev ua vaj tse, cov pob zeb zoo nkauj, cov pob zeb tsis muaj dej, cov pob zeb tsis muaj hluav taws, cov pob zeb hydraulic, cov pob zeb hauv hiav txwv, cov pob zeb, cov pob zeb tawg, thiab lwm yam.

Los ntawm Kev Tsim Kho TshuabCov pob zeb tseem tuaj yeem raug cais los ntawm cov txheej txheem kev tsim kho rau hauv centrifugal qhob, lub tshuab nqus tsev, grouted pob zeb, shotcrete, cov pob zeb-compacted, extruded qhob, pumped pob zeb, thiab lwm yam. pob zeb, hlau mesh cement, fiber ntau pob zeb, prestressed pob zeb, thiab lwm yam.

Los ntawm Mixture TypeCov pob zeb tuaj yeem muab faib ua hom sib xyaw ua ke rau hauv cov pob zeb qhuav-qhuav, ib nrab-qhuav-qhuav pob zeb, yas pob zeb, kua pob zeb, cov kua dej siab, cov pob zeb ntws, thiab lwm yam.

Los ntawm AdmixtureCov pob zeb tuaj yeem raug cais los ntawm kev sib xyaw ua ke rau hauv ya tshauv pob zeb, silica fume qhob, slag pob zeb, fiber ntau pob zeb, thiab lwm yam.

Tsis tas li ntawd, cov pob zeb tuaj yeem raug cais los ntawm lub zog compressive rau hauv cov pob zeb uas muaj zog tsawg (compressive zog tsawg dua 30 MPa), nruab nrab lub zog pob zeb (compressive zog 30-60 MPa), thiab cov pob zeb muaj zog siab (compressive zog ntau dua los yog sib npaug rau 60). MPa). Raws li cov ntsiab lus ntawm cov cement ib lub cubic meter, nws tuaj yeem muab faib ua cov pob zeb ntshiv (cov ntsiab lus cement tsis tshaj 170 kg) thiab cov pob zeb nplua nuj (cov ntsiab lus cement tsis pub tsawg dua 230 kg).