Fiberglass Fabric Mesh: Hygrothermal Cycling - Dual Attack Mechanism Ntawm Moisture Thiab Alkali

Moisture ib leeg yog teeb meem. Kub ib leeg ua rau nthuav dav. Tab sis ua ke, lawv tsim kom muaj kev sib koom ua ke.

Kev tshawb fawb tau lees paub tias cov dej noo nkag mus rau cov ntaub ntawv sib xyaw los ntawm kev sib kis- tsis yog los ntawm cov kab nrib pleb thiab cov voids, tab sis ncaj qha los ntawm cov resin nws tus kheej thiab raws cov fiber ntau -matrix interface. Critically, qhov diffusion npaum li cas ntawm lub interface yog sai dua li ntawm cov resin theem. Qhov no txhais tau hais tias ib zaug cov dej nkag mus rau hauv lub cev, nws nrhiav kev sib raug zoo ntawm fiber ntau thiab txheej txheej - qhov chaw tsis muaj zog tshaj plaws.

Thaum noo noo nkag mus, nws nqa nrog nws cov alkaline ib puag ncig ntawm cov cement matrix. Hydroxyl ions (OH⁻) raug thauj ncaj qha mus rau qhov chaw fiber ntau. Thaum tshav kub kub accelerates tus txheej txheem no exponentially. Cov kev tshawb fawb pom tau tias nyob rau hauv ib puag ncig ntuj, txheeb ze av noo tshaj 80% muaj kev cuam tshuam loj rau cov khoom siv ntawm cov iav fiber ntau, nrog lub zog flexural yog qhov qhia tau zoo tshaj plaws.

Lub voj voog hygrothermal tsim ib qho kev rov ua dua ntawm kev puas tsuaj:

Theem Ib - Moisture Ingress:Dej ntws mus rau hauv cov khoom sib xyaw, nkag mus rau hauv fiber ntau -matrix interface. Qhov no ib leeg tuaj yeem ua rau o thiab micro- tawg.

Theem Ob - Alkaline Thauj:Cov dej noo nqa alkaline ions mus rau qhov chaw fiber ntau. OH⁻ ions pib tawm tsam cov silica-oxygen pob txha ntawm cov iav fibers.

Theem Peb - Thaum tshav kub kub Acceleration:Qhov kub siab ua kom nrawm nrawm ntawm qhov diffusion thiab cov tshuaj tiv thaiv kab mob. Lub voj voog rov ua dua -txhua qhov kev rov ua dua uas ua rau muaj kev puas tsuaj tob dua.

Kev tshawb fawb txog kev sib txuas ntawm mortar nyob rau hauv hygrothermal tej yam kev mob qhia ib qho kev pom tseem ceeb: raws li tus naj npawb ntawm hygrothermal cycles nce, txhua yam khoom ua raws li tus qauv ntawm kev txhim kho thawj zaug tom qab poob. Cov cua sov tuaj yeem pib ua kom cov dej ntws tawm mus ib ntus, txhim kho lub zog matrix. Tab sis tib lub tshav kub no, ua ke nrog cov dej noo, nce zuj zus tsim microstructural defects uas thaum kawg ua rau lub cev tsis muaj zog.

Cov qauv kuaj kuaj pom pom qhov kev hem thawj no. Kev soj ntsuam kev tshaj lij suav nrog kev ntsuas hygrothermal cycling (70℃/ 95% RH) los txiav txim siab tuav lub zog tom qab raug.

Thaum ob qhov kev tawm tsam ntawm ya raws thiab alkali ua tiav, qhov kev nce qib yog kwv yees:

Ua ntej, interfacial debonding pib ntawm qib microscopic. Kev sib txuas ntawm fiber ntau thiab txheej tsis muaj zog thaum ya raws nkag mus thiab alkaline nres pib. Kev tshawb fawb lees paub tias qhov zoo ntawm fiber ntau -matrix interface plays lub luag haujlwm tseem ceeb hauv kev puas tsuaj.

Thib ob, micro- tawg daim ntawv thiab nthuav tawm. Cov kab nrib pleb no tsim txoj hauv kev tshiab rau cov dej noo ingress, accelerating lub voj voog.

Thaum kawg, lub zog poob yuav ntsuas tau. Kev tshawb fawb ntawm cov iav fiber ntau ua rau hygrothermal aging qhia qhov txo qis hauv tensile lub zog - qee zaum, 25% lossis ntau dua -vim dej ingress raws qhov sib txuas.

Kev tiv thaiv kev tawm tsam hygrothermal yuav tsum muaj ntau- txheej txheem tiv thaiv:

Cov txheej txheem zoo tshaj plaws tsim kom muaj kev tiv thaiv zoo tiv thaiv kev ya raws. Zoo Fiberglass Fabric Mesh nrog cov ntsiab lus zirconia siab (ZrO₂ Ntau dua lossis sib npaug li 14.5%) thiab ua tiav acrylic txheej muab thawj kab ntawm kev tiv thaiv.

Interface engineering kom ntseeg tau tias kev sib raug zoo ntawm fiber ntau thiab txheej tuaj yeem tiv taus ob qho tib si noo noo thiab alkaline nres. Qhov sib txawv ntawm qhov sib txawv yog qhov tseem ceeb ntawm kev tswj xyuas qhov taw qhia - thaum daim ntawv cog lus no tseem nyob ruaj khov, noo noo tsis tuaj yeem nkag mus rau qhov chaw fiber ntau.

Kev ntsuam xyuas thiab kev txheeb xyuas paub meej tias kev ua haujlwm. Cov qauv kev tshaj lij xav tau kev soj ntsuam ntawm lub zog tuav tom qab hygrothermal cycling, muab kev ntseeg siab tias cov mesh yuav ua tau raws li qhov xav tau ntau xyoo ntawm kev pabcuam lub neej.

Hygrothermal cycling tsis yog lub tswv yim ntawm chav kuaj pom tseeb -nws yog qhov tseeb txhua hnub ntawm txhua phab ntsa sab nrauv. Lub hnub heats lub façade, los nag ntub nws, thiab nyob rau hauv lub cement matrix, noo noo thiab alkali koom ua rog nyob rau hauv ib tug dual nres ntawm lub reinforcement. Qhov zoo ntawm lub mesh txiav txim seb qhov kev tawm tsam no ua tiav lossis ua tsis tiav.

Rau cov pab pawg ua haujlwm, qhov no txhais tau tias saib dhau qhov yooj yim tensile zog tus lej. Qhov tseeb ntsuas ntawm lub peev xwm mesh yog nws lub zog khaws cia tom qab hygrothermal raug - nws muaj peev xwm tiv taus kev sib xyaw ua ke ntawm ya raws, cua sov, thiab alkali txhua xyoo. Thaum koj xaivfiberglass ntaub meshnrog pov thawj tsis kam rau qhov kev tawm tsam ob lub tshuab, koj tsis yog yuav khoom xwb. Koj tab tom nqis peev rau qhov ntev - lub sij hawm durability ntawm phab ntsa nws tus kheej.