Glassfiber Mesh tuaj yeem tiv thaiv Hydrogen Sulfide Corrosion nyob rau hauv dej phwj Manhole mortar Reinforcement?

Dej phwj manholes nyob rau ntawm qhov chaw ua phem tshaj plaws rau kev ua vaj tse. Cov kab mob anaerobic nyob rau hauv cov dej khib nyiab tsim hydrogen sulfide (H₂S), uas volatilizes mus rau hauv lub manhole headspace. Nyob ntawd, cov kab mob sulfur-oxidizing hloov nws mus rau hauv sulfuric acid uas aggressively tawm tsam pob zeb nto, tsav pH los ntawm 12.5 mus rau 2 los yog qis dua 1. Corrosion tus nqi yuav siab tshaj 1 cm ib xyoos twg, slashing lub neej kev pab cuam ntawm 50-100 xyoo mus rau tsawg tshaj li kaum xyoo. Thaum glassfiber mesh thiab mortar reinforcement yog npaj rau manhole tha xim sab hauv phab ntsa, cov lus nug tseem ceeb yog seb lub mesh nws tus kheej puas tuaj yeem muaj sia nyob qhov kev ua phem no.

Fiberglass mesh tau txais txiaj ntsig zoo rau nws cov khoom siv kho tshuab - tensile lub zog ntawm 100-200 MPa- thiab nws lub peev xwm los faib kev ntxhov siab thiab tiv thaiv kev tawg hauv cementitious overlays. Nws kuj muaj cov tshuaj tiv thaiv zoo rau cov kua qaub, alkalis, thiab ntsev, uas haum rau cov nroj tsuag tshuaj thiab cov chaw kho dej khib nyiab. Tab sis hom thiab qhov hnyav ntawm qhov raug teeb meem decisively. Standard fiberglass mesh, txawm tias nrog alkali-resistant txheej, yog tsim los tiv thaiv alkaline ib puag ncig ntawm mortar tshiab (pH ~ 12-13), tsis yog huab acidity (pH <2) ntawm cov kav dej taub hau. Ntev ntev raug rau cov concentrated sulfuric acid tuaj yeem degrade cov iav fibers thiab cuam tshuam cov resin bonds uas tuav cov mesh ua ke.

Qhov no qhia txog lub luag haujlwm zoo ntawm fiberglass mesh hauv daim ntawv thov no: nws yog kev txhim kho cov txheej txheem, tsis yog tshuaj tiv thaiv. Nws tsis kaw qhov chaw lossis thaiv cov kua qaub nkag. Es tsis txhob, thaum muab tso rau hauv ib lub polymer-hloov mortar overlay, nws muab lub zog tensile uas txuas hniav tawg thiab tiv thaiv lub mortar los ntawm spalling nyob rau hauv txhua yam kev nyuaj siab. Txhawm rau kom ua tiav ob qho kev txhawb nqa thiab kev tiv thaiv corrosion, lub mesh yuav tsum tau muab tso rau hauv ib qho tshwj xeeb acid-resistant txheej los yog hauv ob sab phlu. Cov khoom uas embed alkaline-resistant fiberglass nyob rau hauv high-kev ua tau zoo calcium aluminate mortars los yog epoxy-raws li hauv ob sab phlu yog tshwj xeeb engineered rau hnyav sulfide ib puag ncig (pH > 1.0). Nws yog txheej txheej lossis mortar matrix-tsis yog lub mesh nws tus kheej- uas muab tshuaj tiv thaiv sulfuric acid.

Rau dej phwj manhole rehabilitation, cov tswv yim tshuaj yog tseeb:iav fiber meshyuav tsum tau teev raws li ib feem ntawm ib tug ua tiav corrosion-resistant system, yeej tsis raws li ib tug standalone tov. Lub mesh txhawb lub mortar kom tiv thaiv tawg; lub mortar matrix los yog ib qho kua qaub-resistant topcoat muab cov tshuaj tiv thaiv. Txhim kho kom raug, qhov kev sib xyaw ua ke no txuas ntxiv lub neej kev pabcuam thiab txo cov nqi kho. Lub mesh ib leeg tsis tuaj yeem tiv taus hydrogen sulfide corrosion-tab sis ua ib feem ntawm lub tshuab ua haujlwm zoo, nws ua lub luag haujlwm tseem ceeb.