HPMC siv hauv pob zeb

Kev taw qhia

Tam sim no, cov npuas dej siv los ua cov pob zeb ua npuas tsuas tuaj yeem siv los ua cov pob zeb ua npuas tsuas yog thaum nws muaj qhov toughness txaus thiab ruaj khov thaum nws tov nrog slurry thiab tsis muaj kev cuam tshuam rau cov hws thiab hardening ntawm cov ntaub ntawv cementitious. Raws li qhov no, los ntawm kev sim, ntxiv hydroxypropyl methyl cellulose (HPMC), uas yog ib hom ua npuas ncauj stabilizing tshuaj, los txhim kho kev ua tau zoo ntawm cov khoom siv rov ua dua micro-hmoov foamed pob zeb.

Ua npuas ncauj nws tus kheej zoo tsis zoo txiav txim siab qhov zoo ntawm pob zeb, tshwj xeeb tshaj yog nyob rau hauv regenerative hmoov ua npuas ncauj qhob, khib nyiab tom qab crushing, pob zeb hmoov, ua los ntawm nws tus kheej muaj ntau yam tsis sib xws thiab nrog hais thiab pore ntawm cov npoo thiab cov ces kaum, piv nrog cov ua npuas ncauj zoo tib yam. pob zeb, rov siv cov hmoov npuas nyob rau hauv cov pob zeb ua npuas ncauj nyob rau hauv txhua yam kev cuam tshuam yog hnyav dua. Yog li ntawd, qhov zoo dua qhov toughness, me me pore loj, uniformity thiab dispersion ntawm cov npuas dej nyob rau hauv lub slurry, qhov zoo dua qhov zoo ntawm cov recycled micropowder foamed pob zeb. Txawm li cas los xij, nws yog ib qho tseem ceeb heev uas yuav tsum tau ua npuas ncauj nrog lub siab toughness, sib npaug pore loj thiab cov duab. Nyob rau hauv tus txheej txheem ntawm kev siv foaming neeg sawv cev, ua npuas ncauj stabilizer plays lub luag hauj lwm tseem ceeb heev. Feem ntau ntawm cov ua npuas ncauj stabilizer yog cov khoom siv kua nplaum, uas tuaj yeem ua kom cov viscosity ntawm kev daws thiab hloov nws cov dej ntws thaum yaj hauv dej. Thaum siv ua ke nrog foaming tus neeg sawv cev, nws ncaj qha nce cov kua zaj duab xis viscosity ntawm ua npuas ncauj, tsub kom lub elasticity ntawm npuas thiab lub zog saum npoo ntawm kua zaj duab xis.1 xeem

1.1 raw khoom

(1) Cement: 42.5 zoo tib yam Portland cement.

(2) Cov hmoov zoo siv dua tshiab: Cov khoom siv pov tseg hauv qhov chaw kuaj tau raug xaiv thiab crushed rau cov khoom uas muaj qhov loj me me dua 15 hli los ntawm lub puab tsaig crusher, thiab tom qab ntawd muab tso rau hauv lub pob zeb rau kev sib tsoo. Hauv qhov kev sim no, micropowder npaj los ntawm kev sib tsoo lub sijhawm ntawm 60min raug xaiv.

(3) Foaming agent: xab npum foaming tus neeg saib xyuas, nruab nrab lub teeb daj kua nplaum.

(4) Ua npuas ncauj stabilizer: hydroxypropyl methyl cellulose (HPMC), cov khoom siv hauv tsev qib, hmoov, yooj yim soluble hauv dej.

(5) Dej: dej haus. Cov khoom tseem ceeb ntawm cov khoom siv cementitious.

1.2 Sib tov piv tsim thiab suav

1.2.1 Mix design

Thaum lub sijhawm sib tham, tuaj yeem nce lossis txo qis dua cov khoom siv ntom ntom nti, los ntawm kev sib sau ua kom muaj qhov sib txawv ntawm cov qauv kev tsim kho, ua npuas ncauj txuas ntxiv ua npuas ncauj pob zeb fluidity ntawm slurry loj tswj nyob rau hauv 180 mm + 20 mm.

1.2.2 Kev suav ntawm kev sib xyaw ua ke

Txhua tus qauv tsim molding 9 pawg ntawm cov qauv thaiv (100mmx100mmx100mm), tus qauv

Tag nrho cov ntim ntawm qhov kev sim thaiv V0 = (0.1 × 0.1 × 0.1)x27 = 2.7 × 10-2m3, teem tag nrho ntim V =

1.2 × 2.7 × 10-2 = 3.24 × 10-2m3, foaming agent ntau npaum M0 = 0.9V = 0.9 × 3.24 × 10-2 =

2.916 × 10-2kg, dej yuav tsum tau rau diluting foaming tus neeg sawv cev yog MWO.

2. Kev sim cov txiaj ntsig thiab kev sib tham

Los ntawm kev kho qhov ntau npaum li cas ntawm HPMC, kev cuam tshuam ntawm cov tshuab ua npuas ncauj sib txawv ntawm cov khoom siv ntawm cov khoom siv micro-hmoov foamed pob zeb tau tshuaj xyuas. Cov khoom siv kho tshuab ntawm txhua tus qauv raug kuaj.

2.1 Kev cuam tshuam ntawm HPMC ntau npaum li cas ntawm kev ua npuas ncauj

Ua ntej, cia peb saib "nyias npuas" thiab "nplua nuj npuas". Ua npuas ncauj yog dispersion ntawm cov pa hauv cov kua. Npuas tuaj yeem muab faib ua "npaum npuas" nrog cov kua ntau dua thiab cov pa roj tsawg thiab "cov npuas tuab" nrog cov kua ntau dua thiab tsawg dua. Vim tias muaj cov npuas dej ntau, thiab cov dej muaj kuab heev, cov pob zeb ua npuas ncauj slurry ua yog nyias, thiab cov npuas dej ntau dua, yooj yim los tsim cov dej nqus dej, yog li cov hmoov av ua npuas ncauj tau npaj los ntawm lub zog tsawg, ntau dua. txuas pores, yog inferior ua npuas ncauj. Gas ntau cov kua tsawg ua npuas ncauj, stoma tsim yog ntom, tsuas yog sib cais los ntawm ib tug nyias txheej ntawm dej zaj duab xis, tsub zuj zuj ntawm ua npuas ncauj ntom yog kuj nyias npuas ntom, molding tawm ntawm lub regeneration ntawm micro hmoov ua npuas ncauj kaw pores, siab zog, yog siab. - ua npuas ncauj zoo.

Nrog rau qhov nce ntawm HPMC ntau npaum li cas, qhov ntom ntawm npuas maj mam nce, qhia tias cov npuas dej yog ntau thiab ntau ntom, foaming agent foaming ntau roughly ua ntej 0.4% muaj ib tug me ntsis txhim khu kev qha, ntau tshaj 0.4% tom qab inhibition nyhuv, qhia tau hais tias tus viscosity ntawm foaming tus neeg sawv cev daws nce, cuam tshuam lub peev xwm foaming. Nrog rau qhov nce ntawm HPMC ntau npaum li cas, cov npuas dej tso tawm thiab kev sib haum xeeb maj mam txo tus lej. Ua ntej 0.4%, tus nqi txo yog loj, thiab thaum tus nqi siab tshaj 0.4%, tus nqi txo, qhia tau hais tias nrog kev nce ntawm foaming tus neeg saib xyuas cov kua viscosity, cov kua hauv npuas kua zaj duab xis tsis yooj yim rau paug los yog paug yog heev. me me, thiab cov kua nruab nrab ntawm npuas tsis yooj yim ntws. Lub npuas kua zaj duab xis thickness txo qis, lub npuas tawg lub sij hawm ntev, lub npuas kua zaj duab xis nto lub zog yog txhim khu kev qha, lub npuas kuj muaj ib tug tej yam kev mob ntawm elasticity, thiaj li ua rau lub stability ntawm lub npuas.

Tau txhim khu kev qha. Qhov kev sib hais haum tus nqi tom qab 0.4% kuj qhia tau hais tias cov npuas dej kuj ruaj khov rau lub sijhawm no. Lub tshuab foaming yog qhov nyuaj rau ua npuas ncauj ntawm 0.8%, thiab ua npuas ncauj ua haujlwm yog qhov zoo tshaj plaws ntawm 0.4%, thiab npuas ntom ntom yog 59kg / m3 ntawm lub sijhawm no.

2.2 Kev cuam tshuam ntawm HPMC cov ntsiab lus ntawm qhov zoo ntawm cov khoom siv rov ua dua micro-phom foamed qhob slurry

Nrog rau qhov nce ntawm HPMC cov ntsiab lus, qhov sib xws ntawm slurry nce. Thaum cov ntsiab lus tsawg dua 0.4%, qhov sib xws nce qeeb thiab tsis tu ncua, thiab thaum cov ntsiab lus ntau dua 0.4%, tus nqi nrawm nrawm, qhia tau tias cov npuas dej tuab dhau, dej npuas tsawg, thiab ua npuas ncauj ntau dua. Nyob rau hauv tus txheej txheem ntawm kev ua kom ntau npaum li cas, cov npuas dej hauv slurry yog qhov zoo tshaj plaws nyob rau hauv thaj tsam ntawm 0.4% ~ 0.6%, thiab cov npuas dej tsis zoo sab nraum qhov no. Thaum cov ntsiab lus tsawg dua 0.4%, qhov kev faib tawm ntawm huab cua pores hauv slurry yog qhov sib xws thiab qhia tau tias muaj kev txhim kho tsis tu ncua. Thaum cov ntsiab lus tshaj cov ntsiab lus no, kev faib tawm ntawm cov huab cua tsis zoo thiab ua rau muaj kev tsis ncaj ncees, uas tsis tuaj yeem ua rau muaj cov nqaij npuas ntau dhau ntawm cov txheej txheem .

2.3 Kev cuam tshuam ntawm HPMC cov ntsiab lus ntawm kev ua haujlwm ntawm cov khoom siv rov ua dua micropowder foamed pob zeb

Txawm hais tias ua npuas ncauj li cas, qhov loj ntawm cov npuas hauv npuas yuav tsis zoo ib yam. Kev ntsuam xyuas ntawm cov khoom siv pov tseg tom qab crushing kev sib tsoo, nws cov duab tsis zoo ib yam, du hauv cov npuas thiab cov slurry sib xyaw, cov duab tsis zoo ntawm slurry nrog cov npoo thiab cov ces kaum, spikes ntawm cov khoom tuaj yeem ua rau muaj kev cuam tshuam tsis zoo ntawm cov npuas dej, lawv hu rau ntau dua. Raws li qhov taw tes ntawm kev sib cuag nrog qhov chaw, tsim kom muaj kev ntxhov siab, stabbing npuas, ua npuas tawg, yog li, Kev npaj cov khoom siv rov ua dua micropowder foamed qhob yuav tsum muaj kev ruaj ntseg ntau dua ntawm cov npuas dej. Daim duab 4 qhia txog kev cuam tshuam ntawm cov txheej txheem ua npuas ncauj sib txawv ntawm kev ua haujlwm ntawm cov khoom siv rov ua dua micropowder foamed pob zeb.

Ua ntej 0.4%, qhov ziab qhuav maj mam txo qis thiab tus nqi nrawm dua, thiab kev nqus dej tau zoo dua. Tom qab 0.4%, qhov ziab qhuav hloov pauv, thiab qhov nqus dej nce sai sai. Hauv 3D, lub zog compressive yeej tsis muaj qhov sib txawv ua ntej 0.4%, thiab tus nqi zog yog li 0.9mpa. Tom qab 0.4%, tus nqi siv me me. Lub zog compressive ntawm 7d muaj qhov sib txawv pom tseeb. Tus nqi zog ntawm qhov ntau npaum li cas ntawm 0.0 yog pom tseeb tsis loj li ntawm 0.2% thiab 0.4%, tab sis siab dua li ntawm 0.6% thiab 0.8%, thiab lub zog tus nqi ntawm 0.2% thiab 0.4% tseem muaj qhov sib txawv me ntsis. Qhov kev hloov ntawm lub zog tus nqi ntawm 28d yog qhov pib zoo ib yam li ntawm 7d.

Dosage 0.0 yooj yim qhia tias nyias npuas, npuas toughness, stability yog phem, nyob rau hauv tus txheej txheem ntawm slurry mixing thiab cov qauv condense sclerosis, muaj ntau ntawm npuas breakage, lub puab porosity ntawm cov specimen yog siab dua, tom qab tsim cov qauv kev ua tau zoo tsis zoo, nrog rau qhov nce ntawm ntau npaum li cas, nws qhov kev ua tau zoo maj mam zoo dua, cov npuas hauv cov slurry dispersed ntau tusyees thiab tawg mus rau tsawg dua degree, Tom qab molding, muaj ntau kaw qhov nyob rau hauv cov qauv ntawm cov qauv, thiab cov duab, aperture thiab porosity ntawm lub qhov yog zoo dua, thiab kev ua tau zoo ntawm cov qauv yog zoo dua. Pom ib tug qauv ntawm kev txo qis 0.4%, lub zog thiab nws tus nqi tsis yog ntau li 0.0, ua npuas ncauj tsis tuaj yeem sib xyaw nrog cov ceg tawv xis, cov npuas tuaj yeem ' t yuav zoo sib xws nyob rau hauv lub slurry, uas tshwm sim nyob rau hauv lub tsim ntawm cov qauv yog qhov loj ntawm qhov sib txawv degree ntawm npuas, Yog li ntawd, muaj qhov loj thiab cov qhov txuas txuas hauv cov qauv tom qab solidification thiab hardening, ua rau cov qauv tsis zoo, tsis muaj zog thiab cov dej nqus dej siab ntawm cov qhov hauv cov qauv. Nyob rau hauv daim duab, lub ntsiab yog vim li cas rau lub zog hloov yog lub pore junctions nyob rau hauv lub puab ib feem ntawm lub micropowder ua npuas ncauj pob zeb.

Kev txhim kho ntawm cov qauv kuj qhia tau hais tias HPMC tsis muaj kev cuam tshuam rau cov dej ntawm cov cement. Thaum HPMC cov ntsiab lus yog kwv yees li ntawm 0.2% ~ 0.4%, lub zog ntawm recycled micropowder foamed qhob yog zoo dua.

3 xaus

Ua npuas ncauj yog qhov tsim nyog rau kev ua cov pob zeb ua npuas ncauj, thiab nws qhov zoo yog cuam tshuam ncaj qha rau qhov zoo ntawm foamed pob zeb. Txhawm rau kom muaj kev ruaj ntseg txaus ntawm foams, tus neeg sawv cev foaming thiab HPMC yog tov los siv. Los ntawm kev txheeb xyuas ntawm cov npuas dej, slurry thiab qhov kawg pob zeb zoo, nws pom tias:

(1) Qhov sib ntxiv ntawm HPMC muaj kev txhim kho zoo ntawm kev ua haujlwm ntawm cov npuas dej. Piv nrog rau 0.0, cov foaming agent foaming piv tau nce 1.8 npaug, npuas ntom tau nce 21 kg / m3, 1h los ntshav dej txo los ntawm 48 mL, 1h qhov kev sib haum xeeb txo los ntawm 15 mm;

(2) HPMC ntxiv los txhim kho kev tsim kho ntawm tag nrho cov zoo ntawm cov hmoov ua npuas ncauj slurry, piv rau tsis sib tov, rationally nce lub slurry sib xws, txhim kho cov liquidity thiab txhim kho stability ntawm lub slurry npuas, txhim khu lub uniformity ntawm cov npuas dej. dispersed nyob rau hauv lub slurry, txo qhov sib txuas qhov, qhov loj thiab qhov tshwm sim ntawm qhov tshwm sim xws li kev sib tsoo hom, ntau npaum li cas ntawm 0.4%, Tom qab cov pwm molding yog txiav, nws aperture yog me me, cov duab ntawm lub qhov yog ntau puag ncig, kev faib ntawm lub qhov yog ntau uniform;

(3) Thaum HPMC cov ntsiab lus yog 0.2% ~ 0.4%, 28d compressive zog ntawm recycled micropowder foamed qhob yog siab dua, tab sis xav txog qhuav ntom, dej nqus thiab thaum ntxov zog, qhov zoo tshaj plaws yog thaum HPMC cov ntsiab lus yog 0.4%. Lub sijhawm no, qhuav ntom ntom 442 kg / m3, 7d compressive zog 2.2mpa, 28d compressive zog 3.0mpa, dej nqus 28%. HPMC ua lub luag haujlwm zoo hauv kev ua haujlwm ntawm cov khoom siv rov ua dua micro-hmoov foamed pob zeb, uas qhia tau hais tias HPMC muaj qhov hloov tau zoo thiab sib haum xeeb thaum siv hauv cov khoom siv rov ua dua micro-hmoov foamed pob zeb.