Av Stabilizers --- Ib Lub Zog Hluav Taws Xob hauv Kev Tsim Kho Vaj Tse
Kev tsim kho vaj tse, txawm tias tsim txoj hauv kev, paving chaw nres tsheb, lossis kev txhim kho cov av tshwj xeeb ntawm cov cheeb tsam tsis zoo, ntsib ntau yam kev nyuaj siab. Txawm li cas los xij, qhov tshwm sim ntawm cov av stabilizers, zoo li lub hnub qub thev naus laus zis tshiab ci ntsa iab, tau muab cov kev hloov pauv hloov pauv rau cov kev cov nyom no, yog qhov ua tau zoo kawg nkaus.
Cov Ntsiab Lus Tseem Ceeb thiab Kev Txhim Kho Cov Ntsiab Cai ntawm Av Stabilizers
Cov Ntsiab Cai
Av stabilizers yog admixtures tsim tshwj xeeb los hloov cov khoom hauv av. Lawv ua tiav cov av los ntawm kev ua haujlwm ntawm cov tshuaj lom neeg thiab kev ua haujlwm ntawm lub cev. Lawv tsis tsuas yog hloov cov av xoob, tsis ruaj khov rau hauv cov av muaj zog, ruaj khov nrog cov khoom siv zoo heev, tab sis kuj tseem ua lub luag haujlwm tseem ceeb hauv kev tsim kho engineering niaj hnub. Piv txwv li, nyob rau hauv cov ntsiab lus ntawm gravel kev tsim kho, ib hom tshwj xeeb hu uagravel txoj kev stabilizeryog siv los txhim kho lub durability thiab load- bearing peev xwm ntawm txoj kev nto.
Stabilization Principles
Lub hauv paus ntsiab lus stabilization ntawm av stabilizers feem ntau suav nrog cov tshuaj thiab lub cev mechanisms.
Tshuaj Reaction Mechanisms
Cov tshuaj tiv thaiv ntawm cov khoom xyaw nquag hauv stabilizer thiab cov zaub mov hauv cov av yog lub hauv paus ntawm cov txheej txheem stabilization. Piv txwv li, silicates hydrolyze thaum sib cuag nrog dej, tsim silicate colloids. Cov colloids no muaj cov khoom ruaj khov thiab tuaj yeem sib pauv ions nrog hlau ions (xws li calcium, magnesium, thiab hlau) ntawm cov av hauv av, tsim cov tshuaj lom neeg muaj zog. Tsis tas li ntawd, qee cov stabilizers muaj cov khoom xws li aluminates, uas polymerize nyob rau hauv alkaline ib puag ncig los tsim gelling tshuaj xws li calcium aluminate hydrates, ntxiv dag zog rau cov av ceev. Cov txheej txheem no muaj txiaj ntsig tshwj xeeb hauv kev siv xws li gravel txoj kev stabilization, qhov chaw stabilizer cov khoom siv tshuaj yog qhov tseem ceeb rau kev khi cov gravel particles ua ke.
|
Yam khoom |
Kua (yuav tsum tau dilution ua ntej siv) |
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Cov khoom xyaw tseem ceeb |
Acrylic polymer |
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Qhov tshwm sim |
Milky-cov kua dej dawb |
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tsw |
Yam ntxwv |
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pH (20 degree) |
5 – 7 |
|
Kev txheeb ze ntom ntom (dej=1) |
1.01 ± 0.02 g cm⁻³ |
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Dynamic Viscosity |
1 100 - 1 500 mPa·s (Brookfield DC-III+, Spindle 3 / 100 rpm, 23 ± 3 degree) |
Lub cev Mechanism ntawm Action
Thaum lub sij hawm sib tov, lub stabilizer yog sib npaug zos rau hauv av. Nws cov khoom me me nkag mus tob rau hauv qhov pores ntawm cov av hais, ua rau cov khoom me me. Lub stabilizer kuj hloov qhov chaw them nqi ntawm cov av, txo cov electrostatic repulsion ntawm cov khoom thiab txhawb cov particle aggregation. Raws li cov txheej txheem stabilization zuj zus, cov av maj mam hloov los ntawm lub xeev xoob granular mus rau cov qauv phaj cohesive, ua kom nws muaj peev xwm ua tau zoo. Qhov kev hloov ntawm lub cev no yog qhov tseem ceeb rau kev siv xws ligravel txoj kev stabilizer, qhov twg compactness thiab cohesion ntawm cov av yog ib qho tseem ceeb rau txoj kev ua tau zoo
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