Qhov sib piv ntawm micro silica hmoov hauv pob zeb

Microsilica, thaum ntxiv rau cement-based pob zeb, mortar, thiab refractory castables, tuaj yeem sau cov voids ntawm cov cement hais thiab hnov ​​​​mob nrog cov khoom siv dej los tsim cov gel. Nws kuj reacts nrog alkaline cov ntaub ntawv xws li magnesium oxide los tsim ib gel. Kev sib xyaw kom tsim nyog ntawm microsilica tuaj yeem muaj cov teebmeem hauv qab no:

• Zoo heev txhim kho compressive, flexural, impermeability, corrosion kuj, cuam tshuam tsis kam, thiab abrasion kuj.
• Txhim khu kev tuav dej, tiv thaiv kev sib cais thiab los ntshav, thiab txo cov pob zeb ua haujlwm tsis zoo.
• Txhim kho lub neej kev pab cuam ntawm pob zeb, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav xws li chloride ntsev paug, sulfate erosion, thiab high humidity, txhim kho durability mus txog ob peb zaug.
• Tseem ceeb txo rebound nyob rau hauv sprayed qhob thiab castables, ua rau lub thickness ntawm txhua sprayed txheej.
• Nws yog ib qho tseem ceeb ntawm cov pob zeb ua kom muaj zog, nrog rau cov ntawv thov hauv cov haujlwm nrog cov pob zeb ua kom muaj zog txog li C150.
• Muaj li tsib npaug ntawm kev ua tau zoo ntawm cov cement, uas tuaj yeem txo cov nqi thiab txhim kho kev ruaj khov thaum siv cov pob zeb zoo tib yam thiab cov cement castables tsawg.
• Zoo tiv thaiv alkali-tag nrho cov tshuaj tiv thaiv hauv pob zeb.
• Txhim kho qhov ntom ntawm cov khoom castable refractory. Thaum sib koom ua ke nrog Al2O3, nws yooj yim dua tsim cov theem mullite, txhim kho lub zog kub thiab thermal poob siab.

Mix Design for Microsilica Qhob

Kev sib xyaw tsim rau microsilica pob zeb feem ntau suav nrog kev txiav txim siab ntawm kev sib koom ua ke, kev pom zoo ntawm microsilica, kev pom zoo ntawm cov dej txo cov neeg ua haujlwm, thiab kev hloov ntawm cov xuab zeb thiab pob zeb, thaum lwm yam ua raws li cov qauv tsim rau cov pob zeb zoo tib yam.

a) Method of Incorporation:

Microsilica tuaj yeem muab tso rau hauv pob zeb hauv ob txoj hauv kev tseem ceeb: sab hauv lossis sab nraud, ob qho tib si yuav tsum tau siv cov tshuaj txo cov dej.

Internal Ntxiv:Microsilica hloov cov cement thiab tuaj yeem siv tau ob txoj hauv kev: hloov sib npaug thiab hloov ib nrab. Kev hloov sib npaug txhais tau tias microsilica hloov qhov sib npaug ntawm cov cement, thaum hloov ib nrab txhais tau tias 1 kg ntawm microsilica hloov 1-3 kg ntawm cement. Qhov ntau npaum li cas ntawm 5% mus rau 30%, nrog rau cov dej-cement piv feem ntau tsis hloov pauv.

Sab nraud Ntxiv:Microsilica yog ntxiv rau cov pob zeb zoo li cov khoom sib xyaw yam tsis muaj kev txo qis ntawm cov cement, nrog rau qhov ntau npaum li ntawm 5% mus rau 10%. Qhob nrog sab nraud ntxiv microsilica feem ntau pom cov khoom siv ntau dua, tab sis nws ua rau cov khoom siv cementitious ntau ntxiv hauv cov pob zeb.

b) Optimal Dosage of Microsilica:

Cov microsilica tsawg dhau los muaj qhov cuam tshuam tsawg heev ntawm kev ua vaj tse, thaum ntau dhau ua rau cov pob zeb nplaum dhau, nyuaj rau kev ua haujlwm nrog, thiab ua rau muaj qhov tseem ceeb qhuav shrinkage thiab tsis muaj Frost tsis kam. Yog li ntawd, qhov kev pom zoo ntawm microsilica yuav tsum raug txheeb xyuas kom ua tiav cov txiaj ntsig zoo tshaj plaws. Feem ntau, ntau npaum li cas hauv 10% yields cov txiaj ntsig zoo. Qhov ntau npaum li cas tsim nyog yog txiav txim siab raws li hom microsilica, cement, thiab cov khoom sib sau los ntawm kev xaiv ntau npaum li cas, xws li 3%, 5%, 7%, thiab 10%, thiab tsim cov qauv ua vaj tse los npaj R-SF (lub zog. - microsilica dosage) nkhaus. Nco ntsoov tias microsilica kuj tseem kim, yog li cov txheej txheem kev lag luam thiab kev lag luam yuav tsum tau txiav txim siab thaum txiav txim siab ntau npaum li cas.

c) Kev noj tshuaj zoo tshaj plaws ntawm cov dej txo qis:

Yog tias tsis muaj dej-txo cov neeg ua haujlwm, kev tswj kom zoo tib yam fluidity hauv microsilica pob zeb yuav tsum tau nce cov dej-cement piv, uas tsis txhim kho cov pob zeb ua kom muaj zog. Kev sib xyaw ua ke ntawm microsilica thiab dej-txo cov neeg ua haujlwm tso cai rau cov dej-cement piv tsis hloov thaum ua tiav cov dej ntws zoo sib xws thiab txhim kho lub zog thiab kev ua tau zoo ntawm microsilica pob zeb. High-efficiency naphthalene-raws li dej-txo cov neeg ua haujlwm, xws li Jian 1, H, DH3, FDN, NF, N2B, thiab lwm yam, feem ntau siv hauv Suav teb, nrog ntau npaum li cas hauv 1% ntawm cov khoom siv cementitious. Qee qhov xwm txheej, txhawm rau txo cov dej-cement piv thiab npaj cov pob zeb ua kom muaj zog, cov tshuaj txo cov dej tuaj yeem ncav cuag 2% mus rau 3%.

d) Kev kho cov xuab zeb thiab pob zeb:

Rau sab hauv ntxiv ntawm microsilica, cov xuab zeb thiab gravel feem ntau tsis xav tau kev hloov kho. Rau sab nraud ntxiv, qhov ntim ntawm cov xuab zeb thiab pob zeb yuav tsum raug txo los ntawm qhov ntim sib npaug ntawm microsilica.