Hydroxypropyl methylcellulose yog cov dej-soluble polymer compound, tseem hu ua dej-soluble resin lossis dej-soluble polymer. Nws thickens qhov sib tov los ntawm kev nce viscosity ntawm cov dej sib tov. Nws yog cov khoom siv hydrophilic polymer. Nws tuaj yeem yaj hauv dej los tsim kev daws teeb meem lossis dispersion. Cov kev sim qhia tau hais tias thaum tus nqi ntawm naphthalene-based superplasticizer nce, kev koom ua ke ntawm superplasticizer yuav txo qhov kev tsis sib haum xeeb ntawm cov cement mortar tshiab. Qhov no yog vim hais tias naphthalene superplasticizer yog surfactant. Thaum cov dej txo tus neeg sawv cev ntxiv rau hauv mortar, cov dej txo tus neeg sawv cev yog teem rau saum npoo ntawm cov cement hais, yog li ntawd cov khoom ntawm cov cement particle muaj tib nqi. Qhov hluav taws xob repulsion disintegrates cov qauv flocculation tsim los ntawm cov cement hais, thiab cov dej qhwv hauv cov qauv raug tso tawm, ua rau poob ntawm ib feem ntawm cov cement. Nyob rau tib lub sijhawm, nws tau pom tias nrog kev nce ntawm HPMC cov ntsiab lus, qhov kev tsis sib haum xeeb ntawm cov cement mortar tshiab tau zoo dua thiab zoo dua.
Lub zog muaj zog ntawm pob zeb:
HPMC underwater non-dispersible qhob admixture yog siv nyob rau hauv txoj kev loj choj foundation engineering, thiab tsim lub zog theem yog C25. Raws li qhov kev sim yooj yim, cov cement yog 400kg, microsilica tus nqi yog 25kg / m3, qhov zoo ntawm HPMC yog 0.6% ntawm cov cement, cov dej-cement piv yog 0.42, xuab zeb piv yog 40%, thiab cov zis ntawm naphthyl superplasticizer yog 8% ntawm cov cement. , Cov pob zeb ua piv txwv nyob rau hauv huab cua rau 28 hnub muaj qhov nruab nrab lub zog ntawm 42.6MPa, thiab cov pob zeb ua rau hauv qab dej rau 28 hnub nrog cov dej poob ntawm 60 hli muaj qhov nruab nrab lub zog ntawm 36.4 MPa.
1. Qhov sib ntxiv ntawm HPMC muaj qhov pom tseeb retarding nyhuv ntawm cov tshuaj mortar sib tov. Nrog rau qhov nce ntawm HPMC cov ntsiab lus, qhov teeb tsa lub sijhawm ntawm mortar maj mam prolongs. Raws li tib cov ntsiab lus HPMC, cov mortar tsim nyob rau hauv dej yog zoo dua li cov mortar tsim nyob rau hauv huab cua. Lub sij hawm solidification ntawm molding yog ntev dua. Qhov no feature pab txhawb nqa underwater pob zeb siv.
2. Cov cement mortar tshiab tov nrog hydroxypropyl methylcellulose muaj kev sib raug zoo zoo thiab tsis tuaj yeem los ntshav.
3. Cov ntsiab lus ntawm HPMC thiab cov dej xav tau ntawm cov mortar txo qis ua ntej thiab tom qab ntawd nce ntau.
4. Kev sib koom ua ke ntawm cov dej txo tus neeg sawv cev txhim kho qhov teeb meem ntawm kev xav tau dej ntau ntxiv rau cov tshuaj khib nyiab, tab sis nws yuav tsum tau tswj kom tsim nyog, txwv tsis pub qee zaum nws yuav txo qis cov dej tsis sib haum ntawm cov tshuaj cement mortar tshiab.
5. Muaj qhov sib txawv me ntsis ntawm cov qauv ntawm cov cement paste specimen tov nrog HPMC thiab cov qauv dawb paug, thiab muaj qhov sib txawv me ntsis ntawm cov qauv thiab qhov ntom ntawm cov cement paste specimen hauv cov dej thiab cua. Cov qauv tsim tom qab 28 hnub hauv qab dej yog xoob me ntsis. Qhov laj thawj tseem ceeb yog qhov sib ntxiv ntawm HPMC zoo heev txo qhov poob thiab tawg ntawm cov cement thaum lub sij hawm nchuav dej, tab sis kuj txo cov compactness ntawm cement pob zeb. Hauv qhov project, tus nqi ntawm HPMC yuav tsum raug txo kom ntau li ntau tau thaum ua kom muaj kev cuam tshuam ntawm kev tsis sib haum xeeb hauv dej.
6. Kev sib xyaw ua ke ntawm HPMC underwater non-dispersible qhob admixture, kev tswj tus nqi yog qhov tsim nyog rau kev txhim kho lub zog. Cov phiaj xwm kev sim tau pom tias cov pob zeb tsim hauv dej muaj qhov sib piv ntawm 84.8% ntawm qhov tsim hauv huab cua, thiab cov nyhuv tseem ceeb dua.
Post lub sij hawm: Jun-16-2023