Synergy Effect Of Nano-Organic Palygorskite Ntawm Cov Khoom Ntawm Lub Hnub Qub SBS-Modified Asphalt Part 1
Jul 24, 2023
Abstract: Nrog txoj kev loj hlob sai ntawm kev tsim kho kev lag luam, styrene-butadiene-styrene (SBS)- hloov kho asphalt tau siv ntau thiab ntau dua hauv kev loj engineering, tab sis tseem muaj ntau qhov tsis zoo hauv cov txheej txheem ntawm kev siv. Txhawm rau txhim kho nws cov kev ua tau zoo rau kev siv, nano organic palygorskite (A-Pal) thiab lub hnub qub zoo li SBS tau muab sib xyaw kom tau txais kev hloov kho asphalt hauv txoj kev tshawb no. Qhov kub-kub ruaj khov ntawm SBS-hloov asphalt tau txhim kho tom qab kev koom ua ke nrog A-Pal rau kev ntsuas kub-kub ruaj khov los ntawm kev ntsuas dynamic shear rheometer. A-Pal yuav tsum txhim kho lub zog tsis muaj zog thiab adhesion ntawm SBS-hloov asphalt los ntawm kev ntsuas dej ruaj khov. Kev ntsuam xyuas kev laus qhia tau tias A-Pal tuaj yeem txo cov thermal oxygen decomposition ntawm SBS thiab txhim kho cov kev ua haujlwm tiv thaiv kev laus thiab qaug zog ntawm SBS-hloov asphalt. A-Pal muaj qee yam kev txhim kho ntawm qhov kev ua tau zoo ntawm qhov kub thiab txias ntawm SBS-hloov asphalt raws li qhia los ntawm qhov ntsuas kub ntawm qhov kub thiab txias. A-Pal-compounded SBS-hloov asphalt nta zoo cia ruaj khov nyob rau hauv ib txwm kub nrog qhov qis tshaj qhov tseem ceeb tshaj qhov ntsuas kub.
Nyem rau qhov Kuv Yuav Yuav Cistanche
【Yog xav paub ntxiv:george.deng@wecistanche.com / WhatApp:86 13632399501 】
Ntsiab lus: palygorskite; SBS; hloov kho asphalt; rheological zog
1. Taw qhia
Nyob rau hauv xyoo tas los no, nano-cov ntaub ntawv thiab nano-technology tau siv ntau zaus nyob rau hauv lub tshav pob ntawm pavement cov ntaub ntawv, thiab nano-hloov asphalt tau dhau los ua ib qho ntawm cov ntsiab lus kub ntawm kev tshawb fawb [1-4]. Tam sim no, cov ntaub ntawv nano-txheej silicate feem ntau yog siv rau cov ntaub ntawv asphalt vim lawv cov zis loj thiab kev ua haujlwm zoo [5–7]. Cov nano-txheej silicate nrog cov qauv siv lead ua tshwj xeeb, uas ua rau asphalt molecules nkag mus rau hauv cov txheej txheem txheej, tuaj yeem ua rau cov txheej txheem sib txawv, txhim kho daim ntawv tev qauv, uas tiv thaiv cov pa oxygen los ntawm kev nkag mus rau asphalt thiab ncua kev laus. Yog li ntawd, nano-hloov asphalt muaj zoo anti-rutting thiab anti-aging zog [8-10]. Nyob rau tib lub sijhawm, organically hloov nanomaterials kuj tuaj yeem txhim kho qhov dispersion degree ntawm polymer hauv asphalt, muab kev nthuav dav dav rau kev hloov kho asphalt yav tom ntej.
Palygorskite (Pal), tseem hu ua attapulgite, yog txheej txheej ntawm cov dej nplua nuj magnesium-aluminium silicate av nplaum ntxhia. Nws muaj lub koob npe nrov li "tus huab tais ntawm lub ntiaj teb" rau nws ntau yam kev siv. Cov qauv siv lead ua ntawm Pal yog tus cwj pwm los ntawm ob txheej Si-O tetrahedral nplooj ntawv uas txuas nrog ib txheej txheej (Mg, Al)-O octahedron nplooj ntawv, thiab cov chav tsev txheej yog txuas nrog oxygen los tsim cov pore zoo li siv lead ua. qauv [11]. Cov pores tau ntim nrog dej zeolite thiab dej siv lead ua los tsim ib lub pob zeb ib leeg. Cov fiber ntau muaj qhov ntev li ntawm 0.5 mus rau 1.0 µm, qee qhov ntev txog li 1 cm, thiab txoj kab uas hla ntawm 20 txog 30 µm [12]. Pal tau siv dav hauv thaj chaw ntawm cov ntaub ntawv txheej [13], cement [14], asphalt, thiab lwm yam khoom siv hauv tsev vim nws qhov zoo rheology, adsorbability, thiab nqi qis [15–17].
Ntau cov kev tshawb fawb qhia tau hais tias muaj cov nano-organic Pal tuaj yeem txhim kho kev laus ntawm asphalt thiab kev sib raug zoo ntawm polymer thiab asphalt. Zhang et al. [10] synthesized organic-Pal nyob rau hauv microwave irradiation thiab siv nws rau Styrene butadiene roj hmab (SBR)-hloov asphalt. Lawv pom tias cov organic-Pal txhim kho kev sib raug zoo thiab kev ruaj ntseg ntawm SBR-hloov asphalt. Tom qab ntawd, lawv tau kawm txog rheological thiab morphological thaj chaw ntawm SBR-hloov asphalt nrog organic-Pal thiab pom tias cov organic-Pal muaj txiaj ntsig zoo rau kev txhim kho cov viscoelasticity thiab tiv thaiv rutting zog ntawm SBR-hloov asphalt [18]. Sun et al. [15] siv Pal rau epoxy asphalt thiab pom tias nws muaj txiaj ntsig zoo ntawm tensile thiab nplaum. Jin et al. [19] siv cov organic-Pal rau asphalt thiab pom tias qhov kev laus ntawm asphalt tau txhim kho zoo heev. Tam sim no, cov nyhuv ntawm cov organic-Pal ntawm styrene-butadiene-styrene (SBS)-hloov asphalt tsis tshua tau kawm. Txhawm rau nkag siab ntxiv txog nws cov txiaj ntsig thiab txhim kho kev ua tau zoo ntawm SBS-hloov asphalt, txoj kev tshawb no tau siv lub hnub qub zoo li SBS hloov kho YH-801 thiab nano-organic palygorskite (A-Pal) los npaj SBS-modified asphalt. Lub teeb ntawm lub asphalt tuaj yeem raug adsorbed los ntawm Pal nrog cov adsorption muaj zog, xws li cov qauv colloidal ntawm asphalt tuaj yeem hloov pauv thiab qhov kub thiab txias ntawm cov hloov asphalt tuaj yeem txhim kho [20].
2. Kev npaj thiab kev xeem cov ntaub ntawv
2.1. Khoom siv
Lub 70# asphalt (AH-70) yog tsim los ntawm Maoming Petrochemical Co., Ltd. (Guangzhou, Tuam Tshoj) nrog rau cov txiaj ntsig kev ua tau zoo hauv cov lus qhia 1. Lub palygorskite yog los ntawm Jiangsu, Suav. Cov yam ntxwv ntawm kev ua tau zoo yog qhia hauv Table 2. Lub hnub qub zoo li styrene-butadiene-styrene thaiv copolymer YH-801 (SBS4303) yog tsim los ntawm Yueyang Baling Petrochemical (Hunan, Tuam Tshoj) nrog qhov sib piv ntawm 30/70.
2.2. Kev npaj ntawm A-Pal-Compounded SBS-Modified Asphalt
Raws li peb cov kev tshawb fawb yav dhau los [19,21], Pal tau kho nrog 1 mol / L HCl tov ntawm 60 ◦C rau 1 h kom tshem tawm qee qhov loj thiab cationic sab nraum cov khoom siv raw, ces ntxuav kom nruab nrab thiab qhuav. Cov tshuaj kho Pal thiab -aminopropyltriethoxysilane (APTES) tau tawg mus rau hauv cov tshuaj xylene, thiab cov txheej txheem condensation reflux tau siv rau kev sib nqus sib nqus rau 10 h, tom qab ntawd ntxuav ob peb zaug nrog cov lim dej, qhuav thiab crushed kom tau A-Pal los txhim kho kev sib raug zoo nrog asphalt matrix. Tus nqi ntawm 0 wt feem pua, 1 wt feem pua, 3 wt feem pua, thiab 5 wt feem pua A-Pal, uas muaj 5 wt feem pua ntawm SBS-hloov asphalt, tau npaj los ntawm cov txheej txheem melting (lub npe AH-70 plus 5Y, AH-70 plus 5Y plus 1A, AH-70 plus 5Y plus 3A, and AH-70 plus 5Y plus 5A, feem).
2.3. Cim xeeb
Lub fluorescence microscope (FM) tau siv los piav qhia txog theem morphology ntawm kev hloov kho asphalt nrog luv-yoj xiav-ntsuab lub teeb (λ=420} nm) excitation (DM3000, Leica). Cov theem morphology ntawm cov fluorescent tivthaiv nyob rau hauv asphalt tau pom los ntawm optical microscopy los kawm ntxiv txog kev sib raug zoo ntawm microstructure thiab macroscopic zog [22].
2.4. Kev ntsuas kub siab Rheological
Kev ua haujlwm kub ntawm asphalt yog hais txog lub peev xwm ntawm asphalt los tiv thaiv kev hloov pauv mus tas li nyob rau hauv kev thauj khoom, uas tau soj ntsuam los ntawm dynamic shear rheometer (DSR, MCR 301, Anton Paar, Austria) rau kev ntsuas kub thiab zaus kev tshuaj ntsuam xyuas. Qhov ntsuas kub ntsuas ntsuas tau ua los ntawm AASHTO T315-05 [23] los kawm txog qhov cuam tshuam ntawm qhov kub thiab txias ntawm qhov sib txawv shear modulus G * thiab theem kaum sab xis δ ntawm A-Pal-compounded SBS-hloov asphalt, Cov cua kub ntawm 2 ◦C / min thiab kub ntawm 40 ~ 90 ◦C. Feem ntau asphalt nyob rau hauv qhov kub thiab txias ua hauj lwm ntawm pavement belongs rau pseudo-yas non-Newtonian kua, thiab viscosity ntawm asphalt txo nrog nce shear npaum li cas. Thaum lub shear tus nqi siab heev los yog tsawg heev, lub viscosity ntawm pseudo-yas non-Newtonian kua mus txog ib tug tas mus li, thiab lub cheeb tsam uas lub viscosity ntawm asphalt tsis hloov nrog lub shear npaum li cas hu ua thawj Newtonian txaus cheeb tsam thiab lub thib ob Newtonian ntws cheeb tsam. Lub viscosity ntawm pseudo-yas non-Newtonian kua yog nyob rau hauv thawj cheeb tsam thiab mus txog qhov siab tshaj plaws thaum nws nyob tas li, uas yog hu ua xoom shear viscosity (ZSV) [24]. Lub viscosity ntawm pseudo-yas non-Newtonian kua yog nyob rau hauv cheeb tsam thib ob thiab mus txog qhov tsawg kawg nkaus thaum nws nyob tas li, uas yog hu ua interfacial shear viscosity (ISV). Cov txiaj ntsig kev xeem tau haum los ntawm Carreau qauv thiab suav nrog ZSV [25]. Kev ntsuas ntawm qhov kub ntawm 60 ◦C raws li AASHTO T315-05, 25 hli ntawm cov phaj oscillating thiab cov yeeb yaj kiab tuab ntawm 1 hli tau siv rau qhov ntsuas ntsuas zaus hauv thaj tsam ntawm 0.01-100 Hz, thiab qhov nkhaus tau luam tawm los ntawm kev loj hlob exponential.
2.5. Kev ntsuas dej ruaj khov
Cov kaum sib cuag ntawm A-Pal-compounded SBS-hloov asphalt kuaj tau ntsuas los ntawm kev ntsuas lub kaum sab xis (DSA100, Kruss, Lub Tebchaws Yelemees). Txoj kev sessile poob yog nqa tawm nrog dej ntshiab, formamide, thiab ethylene glycol. Lub zog dawb saum npoo tau suav los ntawm Owens-Wendt-Rabel-Kaelble (OWRK) txoj kev [26], thiab kev sib raug zoo ntawm peb tau qhia los ntawm txoj kev OWRK raws li hauv qab no.
qhov twg sl yog lub zog tsis muaj zog ntawm cov khoom-kua theem, l yog lub zog tsis muaj zog ntawm cov kua, s yog lub zog tsis muaj zog ntawm cov khoom, ld yog cov dispersion tivthaiv ntawm cov kua, sd yog lub dispersion tivthaiv. khoom, lp yog cov polar tivthaiv ntawm cov kua thiab sp yog polar tivthaiv ntawm cov khoom.
Raws li cov ntaub ntawv saum npoo dawb tsis muaj zog ntawm peb cov khoom siv ntxhia, kev ua haujlwm ntawm adhesion (Yog) rau asphalt rau saum npoo ntawm cov khoom ntxhia tau suav nrog raws li qhia hauv Equation (3) [27,28].
Coj Equation (1) mus rau Equation (2) kom tau txais:
qhov twg ad yog qhov dispersion tivthaiv ntawm asphalt, sd yog lub dispersion tivthaiv ntawm cov ntxhia cov ntaub ntawv, p a yog cov polar tivthaiv ntawm cov asphalt, thiab p s yog cov polar tivthaiv ntawm cov ntxhia khoom.
Kev hloov ntawm Gibbs dawb zog (∆Gaws) nyob rau hauv txhua theem ntawm spalling kev puas tsuaj tuaj yeem qhia tau los ntawm kev ua haujlwm ntawm exfoliation [29] thiab kev suav qhia raws li hauv qab no:
Coj Equation (1) mus rau hauv kab zauv saum toj no kom tau txais:
qhov twg w yog lub zog tsis muaj zog ntawm cov dej, d w yog cov khoom tawg ntawm cov dej, thiab p w yog lub ntsiab lus ntawm cov dej.
2.6. Kev ntsuam xyuas kev laus
The aging performance of A-Pal-compounded SBS-modified asphalt was evaluated by the short-term aging, long-term aging, and fatigue factor. The mass loss rate (MLR), softening point increment index (∆S), rutting factor aging index (RAI), and zero shear viscosity aging index (ZSVAI) of asphalt samples were analyzed after aging treatment in the rolling thin film oven test (TFOT) and pressure aging vessel (PAV) to simulate the short-term and long-term aging of asphalt by AASHTO R28-09 [30]. The critical temperature (fatigue limit temperature) grade corresponding to the fatigue factor (G* × sinδ >5000 kPa) raug kuaj los ntawm qhov ntsuas kub ntawm qhov qaug zog, raws li qhov ntsuas ntsuas rau kev ntsuas qhov qaug zog ntawm asphalt.
2.7. Low-Temperature Rheological Evaluation
Kev ua haujlwm kub qis ntawm asphalt hais txog lub peev xwm ntawm asphalt los tiv thaiv kev tawg hauv qab load. Qhov kub-kub tawg tsis kam ntawm kev hloov kho asphalt tom qab TFOT ntxiv rau PAV kev laus raug soj ntsuam los ntawm kev khoov beam rheometer (BBR), los ntawm cov lus qhia AASHTO T313-12 [31]. Raws li qhov tshwj xeeb, 6 ◦C yog qhov ntsuas qhov ntsuas kom txog thaum asphalt kev ua haujlwm tsis tau raws li qhov yuav tsum tau ua. Lub flexural creep stiffness thiab m tus nqi raug kuaj nyob rau hauv qhov kub thiab txias 0, −6, −12, −18, thiab −24 ◦C nrog load ntawm {{10}}.980 ± 0.05 N rau 240 s.
3. Cov txiaj ntsig thiab kev sib tham
3.1. Morphological yam ntxwv
FM tau ua los saib xyuas kev faib khoom thiab qauv ntawm SBS thiab A-Pal hauv kev hloov kho asphalt [32]. Txhawm rau txhim kho qhov kev ntxub ntxaug ntawm asphalt thiab modifiers, cov asphalt ib feem ntawm cov duab yog tso tawm kom pom cov xim dub, thiab cov khoom siv polymer yog pom raws li cov xim ntsuab ci me ntsis los ntawm kev kho qhov ci ntsa iab hauv daim duab 1. Asphalt yog tshwm sim raws li cov theem txuas ntxiv, thiab cov dispersed. -theem SBS tau tawg raws li daim ntawv ntawm cov kob hauv matrix pitch [33]. Daim duab 1b qhia txog qhov loj ntawm cov blocky me me SBS crosslinks hauv asphalt, uas suav rau ib qho me me thiab kev faib tawm ntawm cov asphalt tsis muaj A-Pal. SBS nta lub peev xwm tsis tshua muaj peev xwm nqus tau cov asphalt mos mos los ntawm asphalt, ua rau muaj kev sib raug zoo tsawg. Tom qab ntxiv 1 wt feem pua A-Pal (Daim duab 1c), qhov kev faib ua feem ntawm cov tshuaj fluorescent tau nce me ntsis, thiab cov dispersion tseem tsis sib npaug ntawm cov asphalt. Lub peev xwm ntawm SBS polymer kom nqus tau cov mos asphaltene tom qab A-Pal tau ntxiv muaj qhov nce ntxiv, uas ua rau lub ntim nthuav dav ntawm SBS polymer thiab qhov nce ntawm qhov o [22]. Nrog rau qhov sib ntxiv ntawm A-Pal (Daim duab 1d, e), qhov kev faib ua feem ntawm cov tshuaj fluorescent tseem nce ntxiv, thiab cov degree ntawm dispersion ua ntau thiab ntau dua. Tom qab ntxiv A-Pal, qhov sib xws ntawm SBS polymer nrog asphalt tau txhim kho rau qee qhov; qhov ntsuas kub qis thiab qaug zog ntawm kev hloov kho asphalt yuav tsum txhim kho [19].
3.2. Kev Ua Haujlwm Kub Kub ntawm A-Pal-Compounded SBS-Modified Asphalt
Qhov kub-kub stability yog ib qho tseem ceeb qhia txog asphalt. Qhov sib txawv ntawm qhov rutted yam tau txais los ntawm qhov ntsuas kub ntsuas ntsuas tau pom hauv daim duab 2. Nws tuaj yeem pom tias qhov sib ntxiv ntawm SBS thiab A-Pal pab txhawb kev txhim kho ntawm rutting factor thiab rutting resistance. Tom qab SBS tau ntxiv rau asphalt, rutting yam ntawm asphalt pom qhov nce loj thiab txhim kho kev tiv thaiv rau rutting. Qhov zoo tshaj plaws rutting txuas ntxiv nrog kev koom ua ke ntawm A-Pal kom ntxiv dag zog rau rutting. Piv nrog rau qhov kev kawm dhau los, nws zoo ib yam thiab tsis tau hloov pauv vim muaj ntau hom SBS [18,19]. Cov qauv nrog A-Pal cov ntsiab lus ntawm 5 wt feem pua tau qhov zoo tshaj plaws rutting thiab muaj zog tiv thaiv rutting muaj peev xwm, qhia tau hais tias kev koom ua ke ntawm A-Pal tuaj yeem txhim kho qhov kub thiab txias ntawm SBS-hloov asphalt. Tus nqi ntawm rutting yam txo qis nrog qhov kub thiab txias, thiab tus nqi yog tib yam, qhia tau hais tias tag nrho cov qauv hloov asphalt muaj tib yam rheological zog.
Qhov ntsuas kub tseem ceeb yog qhov ntsuas kub ntawm G * / sin δ {{{0}}}.0 kPa hauv qhov ntsuas rutting factor hauv Strategic Highway Research Program (SHRP). Qhov ntsuas kub tseem ceeb ntawm txhua tus qauv yog qhia hauv Table 3. SBS tuaj yeem nce qhov kub thiab txias los ntawm 7.2 ◦C, piv nrog AH-70. Tom qab ntxiv A-Pal, rutting yam tseem ceeb kub tsis tu ncua nce, thiab qhov kub siab tshaj plaws tau nce mus rau 75.7 ◦C, uas yog 20 feem pua siab dua li matrix asphalt.
ZSV ntawm kev hloov kho asphalt nce nrog qhov nce ntawm A-Pal cov ntsiab lus, uas zoo ib yam li cov txiaj ntsig ntawm qhov kev ntsuas rutting (Table 4). ZSV ntawm asphalt matrix tau nce 296 feem pua ntawm qhov sib ntxiv ntawm SBS. Tom qab ntxiv 1 wt feem pua A-Pal, ZSV ntawm kev hloov kho asphalt tau nce mus rau 949.4 Pa·s, uas siab dua li ntawm cov hloov kho asphalt nrog SBS nkaus xwb. Nrog rau qhov nce A-Pal cov ntsiab lus, tus nqi ntawm ZSV tseem nce ntxiv, thiab ZSV tus nqi ntawm 5 wt feem pua sib xyaw SBS-hloov asphalt nce mus rau 1291.8 Pa·s, uas yog 423 feem pua siab dua li ntawm asphalt matrix. Nws tau pom tias txoj kev sib xyaw ua ke tau zoo hauv kev txhim kho qhov kub-kub stability ntawm asphalt binder.
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