Dispersion kuj yog ib qho tseem ceeb kev ntsuas ntsuas los ntsuas qhov zoo ntawm anti-dispersant.Hydroxypropyl methyl cellulose yog dej-soluble polymer compound, tseem hu ua dej-soluble resin lossis dej-soluble polymer.Nws nce qhov sib xws ntawm qhov sib tov los ntawm kev ua kom cov viscosity ntawm cov dej sib tov.Nws yog ib yam khoom siv hydrophilic polymer, uas tuaj yeem yaj hauv dej thiab tsim cov kua dej dispersible.Cov kev sim qhia tau hais tias thaum tus nqi ntawm naphthalene system superplasticizer nce, qhov sib ntxiv ntawm superplasticizer yuav txo tau cov dispersion tsis kam ntawm cov cement mortar tshiab.Qhov no yog vim hais tias cov naphthalene series siab npaum dej txo tus neeg sawv cev yog tus neeg sawv cev saum npoo av, thaum cov dej txo tus neeg sawv cev ntxiv rau hauv mortar, cov dej txo tus neeg sawv cev hauv cov cement particle nto oriented nto ntawm cov cement hais nrog tib nqi, hluav taws xob repulsion flocculation. cov qauv ntawm cov cement uas tsim los ntawm kev faib, qhwv hauv cov qauv ntawm cov dej tso tawm, yuav 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, cov tshuaj tiv thaiv kev tawg ntawm cov cement mortar tshiab zoo dua thiab zoo dua.
Lub zog yam ntxwv ntawm pob zeb:
HPMC underwater non-dispersive qhob admixture tau siv nyob rau hauv tus choj foundation engineering ntawm txoj kev nthuav dav, thiab tus tsim lub zog qib yog C25.Tom qab qhov kev sim yooj yim, cov cement ntau npaum li cas yog 400kg, qhov sib xyaw ua ke ntawm silica fume 25kg / m3, HPMC qhov zoo tshaj yog 0.6% ntawm cov cement ntau npaum li cas, dej cement piv yog 0.42, xuab zeb tus nqi yog 40%, naphthalene high efficiency dej txo tus neeg sawv cev yield yog 8%. ntawm cov cement ntau npaum li cas, cov qhob piv txwv hauv huab cua 28d, qhov nruab nrab lub zog yog 42.6MPa, qhov nruab nrab lub zog ntawm cov dej hauv qab cov pob zeb ua ke nrog qhov poob siab ntawm 60mm hauv dej yog 36.4mpa rau 28 hnub, thiab lub zog piv ntawm cov pob zeb tsim hauv dej thiab cov pob zeb tsim hauv huab cua yog 84.8%, uas qhia tau hais tias muaj txiaj ntsig zoo.
1. Qhov sib ntxiv ntawm HPMC muaj qhov pom tseeb retarding nyhuv ntawm mortar sib tov.Nrog rau qhov nce ntawm HPMC ntau npaum li cas, lub sijhawm teem sijhawm ntawm mortar yog ncua ntev.Raws li tib qho xwm txheej ntawm HPMC ntau npaum li cas, lub sijhawm teem sijhawm ntawm cov tshuaj khib nyiab hauv qab dej yog ntev dua li huab cua.Cov yam ntxwv no muaj txiaj ntsig zoo rau kev siv dej hauv qab dej.
2, tov nrog hydroxypropyl methyl cellulose ntawm cov cement mortar tshiab muaj kev sib raug zoo, yuav luag tsis muaj qhov tshwm sim los ntshav.
3, HPMC ntau npaum li cas thiab mortar dej xav tau ua ntej txo qis thiab tom qab ntawd nce ntxiv.
4. Kev koom ua ke ntawm cov dej reducer txhim kho qhov teeb meem ntawm kev xav tau dej ntau ntxiv rau mortar, tab sis nws yuav tsum tau tswj kom muaj nuj nqis, txwv tsis pub qee zaum nws yuav txo qis cov dej dispersion tsis kam ntawm cov cement mortar tshiab.
5. Muaj qhov sib txawv me ntsis ntawm cov qauv ntawm HPMC sib xyaw cement net slurry specimens thiab cov qauv dawb paug, thiab tsis muaj qhov sib txawv me ntsis ntawm cov qauv thiab compactness ntawm cov dej nchuav cement specimens thiab huab cua poured cement net slurry specimens.Lub 28d underwater molding qauv yog me ntsis xoob.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 dej, tab sis kuj txo cov qib ntawm cov cement compaction.Nyob rau hauv qhov project, nyob rau hauv cov xwm txheej ntawm kev ua kom ntseeg tau cov nyhuv underwater non-dispersion, qhov sib xyaw ntawm HPMC raug txo kom deb li deb tau.
6, ntxiv HPMC underwater tsis disperse qhob admixture, tswj tus nqi ntawm lub zog zoo, qhov pilot project qhia tau hais tias lub zog piv ntawm kev sib sau ua vaj tse nyob rau hauv dej thiab tsim nyob rau hauv huab cua yog 84.8%, cov nyhuv tseem ceeb dua.
Post lub sij hawm: Sep-17-2022