Tus nqi zais ntawm Substrate: Qhov Pib Taw Qhia thiab Kev Tiv Thaiv Kab Ntawm Drywall Joint Paper Daim Kab Xev Tsis Ua Haujlwm

Scenario: Tau ntsib nrog ntau xyoo dhau los- cov phab ntsa qub, cov txheej txheem qub tau dhau los ua cov av nplaum. Txhawm rau txuag kev siv zog, ntau tus neeg thov xaiv los thov kev sib koom ua ke tshiab thiab daim kab xev ncaj qha rau nws.

Mechanics ntawm Failure

Qhov no yog ib qho classic ntawm"kev ntxhov siab hloov kev cuam tshuam."Lub zog tensile siab ntawm daim kab xev yuav tsum raug xa mus100% rau cov khoom phab ntsa substratelos ntawm kev sib koom ua ke txheej txheej kom ua haujlwm zoo tiv thaiv kev tawg. Cov hmoov txheej, uas yuav luag tsis muaj zog cohesive ntawm nws cov khoom, tsis tuaj yeem tsim ib qho kev thauj khoom tas mus li -cov kabmob. Nws ua zoo li lub cushion, absorbing thiab dispersing kev nyuaj siab, rendering daim kab xev system ineffective. Thaum kawg, ib qho kev txav me me tuaj yeem ua kom tiav delamination ntawm cov hmoov txheej thiab cov khoom substrate, manifesting raws li dav blistering thiab tawg.

Qhov kawg daws: Ob txoj kev xaiv, tsis muaj peb txoj kev

Kev Xaiv A: Ua kom tiav Kev tshem tawm (Txhim khu kev ntseeg siab tshaj)
Siv lub scraper lossis sander kom tshem tawm tag nrho cov khoom xoob mus rau hauv cov khoom siv hauv qab (drywall lossis cement plaster). Txoj kev no rov qab mus rau xoom- pheej hmoo, thawj lub hauv paus.

Kev xaiv B: Kev siv tshuaj lom neeg thiab kev tsim kho dua tshiab (Kev xaiv zoo)
Siv qhov ua tau zoo -epoxy-raws li los yog acrylic reinforcement primer/sealer(feem ntau hu ua tus neeg sawv cev sib txuas). Nws qhov qis -viscosity resin nkag mus tob rau hauv cov hmoov txheej, khi cov khoom xoob rau hauv ib qho tag nrho, thiab tsim cov yeeb yaj kiab txuas ntxiv nrog cov adhesion siab thiab lub zog ntawm qhov chaw, muab cov khoom lag luam - tshiab, ua haujlwm zoo. Qhov tseem ceeb yog xaiv cov khoom uas muaj kev nkag siab zoo thiab muaj peev xwm ntxiv dag zog thiab tso cai rau nws kho kom zoo.

Scenario: Qhov siab me ntsis sib txawv nyob qhov twg ob lub phab ntsa ntub dej sib ntsib, hu ua "lippage" lossis "misalignment." Tsuas yog faus nws hauv qab txheej tuab ntawm kev sib koom ua ke zoo li yooj yim dua tab sis cog cov noob ntawm cov teeb meem yav tom ntej.

Chemistry thiab Physics ntawm Failure

Lub ntsiab ntawm qhov teeb meem lippage yog a"Kev kub ntxhov ntawm kev ntxhov siab sab hauv hauv cov txheej tuab heev." The shrinkage force of joint compound during drying is proportional to its thickness. The compound over a lippage (especially >1mm) tuaj yeem ua tau ob peb zaug hauv zos ntau dua li thaj chaw ib txwm muaj, ua rau muaj kev nce siab hauv kev ntxhov siab ntawm qhov taw tes. Qhov kev ntxhov siab sab hauv no nrhiav txoj hauv kev tsis muaj zog tshaj tawm, feem ntau ntawm qhovinterface ntawm lub compound thiab lub drywall ntug, uas ua rau muaj kev sib tsoo ncaj nraim raws seam.

Qhov kawg Solution: Tiered Approach, Leveling the Terrain

Tier 1: Micro-Kev hloov kho (Lippage Tsawg dua lossis sib npaug li 1mm)
Thov kev sib koom ua ke ncaj qha tab sis ntiav cov"dav, nyias feathering"txheej txheem. Siv qhov taw tes siab tshaj plaws ntawm daim lippage raws li lub hauv paus, nthuav tawm qhov sib xyaw ua ke thiab nthuav tawm kom deb ntawm ob sab, tsim kom muaj kev sib luag, maj mam nqes kom tsis txhob muaj qhov sib xyaw ntawm daim di ncauj.

Qib 2: Kev kho phais (Lippage> 1mm)

1. Qhov chaw meej: Xav txog ntawm txhais tes los yog siv txoj hlua ntev los txheeb xyuas qhov tseeb ntawm lub vaj huam sib luag siab dua.
2. Mechanical Reduction: Sivntxhib-grit sandpaper (80-100 grit)los yog ntsesurform plane/rasplos xuab zeb cia tshwj xeeb rauntug ntawm lub siab dua phab ntsa vaj huam sib luag, tsim ibsmooth beveltxog 5 -}8 cm dav. Lub hom phiaj yog txhawm rau tshem tawm qhov kev poob qis.
3. Txheem txheej txheem: Ua raws li ib txwm embedding, taping, thiab txheej txheej txheem ntawm no bevel. Qhov no ua kom cov tuab tuab ntawm kev sib xyaw ua ke thiab kev sib xyaw ua ke ntawm kev ntxhov siab.

Kev npaj substrate yog qhov tsis txaus siab tshaj plaws tsis tau muaj kev txawj ntse tshaj plaws - thiab kev ua siab ntev - thov ib feem ntawm kev kho phab ntsa. Nws xav kom tus neeg thov kom muaj lub qhov muag pom qhov tsis pom kev zais thiab qhov kev txiav txim siab tsis lees txais cov shortcuts. Thaum koj siv sijhawm ntau dua li qhov xav tau ntawm cov haujlwm no tsis pom kev npaj, koj tsis yog cuam tshuam nrog phab ntsa yav dhau los; koj tab tom sau ib qho khoom, tiaj tus, thiab lub neej yav tom ntej rau nws. Txawm tias qhov kawg tshwm sim tuaj yeem tiv taus qhov kev sim ntawm lub sijhawm thiab lub teeb pom kev zoo nyob ntawm seb lub hauv paus ruaj khov koj tau npaj rau qhov twg.drywall sib koom daim ntawv daim kab xevqhov system.