Cov nyhuv ntawm hydroxyethyl cellulose ether rau thaum ntxov hydration ntawm CSA cement

Cov teebmeem ntawmHydroxyethyl Cellulose (HEC)thiab siab lossis qis hloov hydroxyethyl methyl cellulose (H HMEC, L HEMC) ntawm cov txheej txheem dej thaum ntxov thiab cov khoom siv dej ntawm sulfoaluminate (CSA) cement tau kawm. Cov txiaj ntsig tau pom tias cov ntsiab lus sib txawv ntawm L-HEMC tuaj yeem txhawb nqa dej ntawm CSA cement hauv 45.0 min ~ 10.0 h. Tag nrho peb lub cellulose ethers ncua lub hydration ntawm cement dissolution thiab transformation theem ntawm CSA ua ntej, thiab ces txhawb lub hydration nyob rau hauv 2.0 ~ 10.0 h. Kev taw qhia ntawm methyl pab pawg txhim kho kev txhawb nqa ntawm hydroxyethyl cellulose ether ntawm hydration ntawm CSA cement, thiab L HEMC muaj qhov muaj zog txhawb zog; Cov nyhuv ntawm cellulose ether nrog cov khoom sib txawv thiab qib ntawm kev hloov pauv ntawm cov khoom siv dej hauv 12.0 teev ua ntej hydration yog qhov sib txawv. HEMC muaj zog txhawb zog rau cov khoom hydration dua HEC. L HEMC hloov kho CSA cement slurry tsim cov calcium-vanadite thiab txhuas cov pos hniav ntawm 2.0 thiab 4.0 h ntawm hydration.
Cov lus tseem ceeb: sulfoaluminate cement; Cellulose ether; Hloov pauv; Degree ntawm kev hloov pauv; Kev ywg dej; Cov khoom siv dej

Sulfoaluminate (CSA) cement nrog anhydrous calcium sulfoaluminate (C4A3) thiab boheme (C2S) raws li lub ntsiab clinker ntxhia yog nrog rau qhov zoo ntawm ceev hardening thiab thaum ntxov lub zog, anti-freezing thiab anti-permeability, tsawg alkalinity, thiab tsawg tshav kub noj nyob rau hauv lub txheej txheem ntau lawm, nrog kev sib tsoo yooj yim ntawm clinker. Nws yog dav siv nyob rau hauv maj kho, anti-permeability thiab lwm yam dej num. Cellulose ether (CE) yog dav siv nyob rau hauv mortar hloov vim nws cov dej-retaining thiab thickening zog. CSA cement hydration cov tshuaj tiv thaiv yog complex, lub sij hawm induction yog luv heev, lub sij hawm acceleration yog multi-theem, thiab nws hydration yog susceptible rau cov tshuaj ntawm admixture thiab curing kub. Zhang et al. pom tias HEMC tuaj yeem ncua lub sijhawm induction ntawm hydration ntawm CSA cement thiab ua rau lub ncov tseem ceeb ntawm cov dej kub tso tawm lag. Sun Zhenping et al. pom tias HEMC cov dej nqus dej cuam tshuam rau cov dej thaum ntxov ntawm cov cement slurry. Wu Kai et al. ntseeg hais tias qhov tsis muaj zog adsorption ntawm HEMC rau ntawm qhov chaw ntawm CSA cement tsis txaus los cuam tshuam cov cua sov tso tawm ntawm cov cement hydration. Cov txiaj ntsig kev tshawb fawb ntawm cov txiaj ntsig ntawm HEMC ntawm CSA cement hydration tsis sib xws, uas tuaj yeem tshwm sim los ntawm cov khoom sib txawv ntawm cov cement clinker siv. Wan et al. pom tias cov dej tuav ntawm HEMC tau zoo dua li ntawm hydroxyethyl cellulose (HEC), thiab cov viscosity dynamic thiab qhov nro ntawm lub qhov dej ntawm HEMC-hloov CSA cement slurry nrog qib siab hloov tau ntau dua. Li Jian et al. tau saib xyuas qhov kev hloov pauv ntawm qhov kub thiab txias thaum ntxov ntawm HEMC-hloov CSA cement mortars nyob rau hauv qhov ruaj khov thiab pom tias qhov cuam tshuam ntawm HEMC nrog cov qib sib txawv ntawm kev hloov pauv txawv.
Txawm li cas los xij, kev tshawb fawb sib piv ntawm cov teebmeem ntawm CE nrog cov khoom sib txawv thiab qib kev hloov pauv ntawm cov dej thaum ntxov ntawm CSA cement tsis txaus. Hauv daim ntawv no, cov teebmeem ntawm hydroxyethyl cellulose ether nrog cov ntsiab lus sib txawv, cov pab pawg hloov pauv thiab qib kev hloov pauv ntawm cov dej thaum ntxov ntawm CSA cement tau kawm. Txoj cai hydration thaum tshav kub kub tso cai ntawm 12h hloov CSA MAAs nrog hydroxyethyl cellulose ether tau soj ntsuam emphatically, thiab cov khoom hydration tau soj ntsuam ntau.

1. Kev xeem
1.1 Cov khoom siv raw
Cement yog 42.5 qib ceev hardening CSA cement, lub sij hawm pib thiab zaum kawg yog 28 min thiab 50 min, feem. Nws cov tshuaj lom neeg muaj pes tsawg leeg thiab ntxhia muaj pes tsawg leeg (feem ntau, qhov ntau npaum li cas thiab dej-cement piv tau hais hauv daim ntawv no yog cov feem ntau lossis qhov sib piv loj) hloov kho CE suav nrog 3 hydroxyethyl cellulose ethers nrog viscosity zoo sib xws: Hydroxyethyl cellulose (HEC), qib siab ntawm kev hloov hydroxyethyl methyl cellulose (H HEMC), qib qis ntawm kev hloov pauv hydroxyethyl methyl fibrin (L HEMC), viscosity ntawm 32, 37, 36 Pa·s, qib kev hloov pauv ntawm 2.5, 1.9, 1.6 sib xyaw dej rau cov dej deionized.
1.2 Mix ratio
Tsau dej-cement piv ntawm 0.54, cov ntsiab lus ntawm L HEMC (cov ntsiab lus ntawm kab lus no yog xam los ntawm qhov zoo ntawm cov av nkos) wL = 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, HEC thiab H HEMC cov ntsiab lus ntawm 0.5%. Hauv daim ntawv no: L HEMC 0.1 wL = 0.1% L HEMC hloov CSA cement, thiab lwm yam; CSA yog ntshiab CSA cement; HEC hloov CSA cement, L HEMC hloov CSA cement, H HEMC hloov CSA cement feem ntau hu ua HCSA, LHCSA, HHCSA.
1.3 Test method
Ib yim-channel isothermal micrometer nrog ntsuas ntau ntawm 600 mW tau siv los ntsuas qhov kub ntawm cov dej. Ua ntej qhov kev xeem, qhov ntsuas tau ruaj khov ntawm (20 ± 2) ℃ thiab txheeb ze av noo RH = (60 ± 5) % rau 6.0 ~ 8.0 h. CSA cement, CE thiab cov dej sib tov tau sib xyaw ua ke raws li qhov sib xyaw ua ke thiab kev sib xyaw hluav taws xob tau ua rau 1min ntawm qhov ceev ntawm 600 r / min. Tam sim ntawd hnyav (10.0 ± 0.1) g slurry rau hauv lub ampoule, muab lub ampoule rau hauv lub ntsuas thiab pib lub sij hawm xeem. Cov dej kub yog 20 ℃, thiab cov ntaub ntawv raug kaw txhua txhua 1 feeb, thiab qhov ntsuas tau mus txog 12.0h.
TS EN ISO 9597-2008 Cement - Kev ntsuas ntsuas - Kev txiav txim siab ntawm lub sijhawm thiab suab nrov Cov cement sib xyaw slurry tau muab tso rau hauv qhov ntsuas pwm ntawm 20 mm × 20 mm × 20 mm, thiab tom qab kev co dag rau 10 zaug, nws tau muab tso rau hauv qab (20 ± 2) ℃ thiab RH = (60 ± 5) % rau kho. Cov qauv raug coj tawm thaum muaj hnub nyoog ntawm t = 2.0, 4.0 thiab 12.0 h, feem. Tom qab tshem tawm cov txheej txheej saum npoo ntawm cov qauv (≥1 hli), nws tau tawg mus rau hauv me me pieces thiab soaked nyob rau hauv isopropyl cawv. Isopropyl cawv tau hloov txhua 1d rau 7 hnub sib law liag los xyuas kom meej qhov kev ncua ntawm cov tshuaj tiv thaiv dej, thiab qhuav ntawm 40 ℃ kom qhov hnyav tas li. Nyhav (75 ± 2) mg cov qauv mus rau hauv lub crucible, ua kom sov cov qauv ntawm 30 ℃ to 1000 ℃ ntawm qhov kub ntawm 20 ℃ / min nyob rau hauv cov cua nitrogen nyob rau hauv adiabatic mob. Lub thermal decomposition ntawm CSA cement hydration cov khoom feem ntau tshwm sim ntawm 50 ~ 550 ℃, thiab cov ntsiab lus ntawm cov tshuaj chemically khi dej tuaj yeem tau los ntawm kev suav cov lej poob ntawm cov qauv hauv qhov ntau. AFt poob 20 crystalline dej thiab AH3 poob 3 crystalline dej thaum lub sij hawm thermal decomposition ntawm 50-180 ℃. Cov ntsiab lus ntawm txhua cov khoom hydration tuaj yeem xam raws li TG nkhaus.

2. Cov txiaj ntsig thiab kev sib tham
2.1 Kev txheeb xyuas cov txheej txheem hydration
2.1.1 Kev cuam tshuam ntawm CE cov ntsiab lus ntawm cov txheej txheem hydration
Raws li hydration thiab exothermic nkhaus ntawm cov ntsiab lus sib txawv L HEMC hloov CSA cement slurry, muaj 4 exothermic peaks ntawm lub hydration thiab exothermic curves ntawm ntshiab CSA cement slurry (wL = 0%). Cov txheej txheem hydration tuaj yeem muab faib ua theem tawg (0 ~ 15.0min), theem hloov pauv (15.0 ~ 45.0min) thiab theem acceleration (45.0min) ~ 54.0min), theem deceleration (54.0min ~ 2.0h), dynamic equilibrium theem ( 2.0 ~ 4.0h), rov ua dua theem (4.0 ~ 5.0h), rov qab theem (5.0 ~ 10.0h) thiab stabilization theem (10.0h ~). Nyob rau hauv 15.0min ua ntej hydration, cov cement pob zeb yaj sai sai, thiab thawj thiab thib ob hydration exothermic peaks nyob rau theem no thiab 15.0-45.0 min sib raug rau qhov tsim ntawm metastable theem AFt thiab nws transformation rau monosulfide calcium aluminate hydrate (AFm), feem. Qhov thib peb exothermal ncov ntawm 54.0min ntawm hydration tau siv los faib cov hydration acceleration thiab deceleration theem, thiab tiam ntawm AFt thiab AH3 coj qhov no raws li qhov inflection point, los ntawm boom mus rau poob, thiab ces nkag mus rau hauv lub dynamic equilibrium theem kav mus txog 2.0 h. . Thaum lub hydration yog 4.0h, hydration dua nkag mus rau theem ntawm acceleration, C4A3 yog ib tug sai sai dissolution thiab tiam ntawm hydration khoom, thiab nyob rau ntawm 5.0h, lub ncov ntawm hydration exothermic tshav kub tshwm, thiab ces nkag mus rau theem ntawm deceleration dua. Dej stabilized tom qab txog 10.0 teev.
Kev cuam tshuam ntawm L HEMC cov ntsiab lus ntawm CSA cement hydration dissolutionthiab theem hloov dua siab tshiab yog txawv: thaum L HEMC cov ntsiab lus qis, L HEMC hloov CSA cement paste qhov thib ob hydration thaum tshav kub kub tso tawm ncov tshwm sim me ntsis ua ntej, qhov kub tso tawm tus nqi thiab kub tso tawm peak tus nqi yog ntau dua li cov ntshiab CSA cement paste; Nrog rau qhov nce ntawm L HEMC cov ntsiab lus, lub tshav kub tso tawm ntawm L HEMC hloov CSA cement slurry maj mam txo, thiab qis dua cov ntshiab CSA cement slurry. Tus naj npawb ntawm exothermic peaks nyob rau hauv lub hydration exothermic nkhaus ntawm L HEMC 0.1 yog tib yam li cov ntshiab CSA cement paste, tab sis 3rd thiab 4th hydration exothermic peaks tau nce mus rau 42.0min thiab 2.3h, feem, thiab piv nrog 33.5 thiab 9.0. mW / g ntawm ntshiab CSA cement paste, lawv cov exothermic peaks tau nce mus rau 36.9 thiab 10.5 mW / g, feem. Qhov no qhia tau hais tias 0.1% L HEMC accelerates thiab txhim khu hydration ntawm L HEMC hloov CSA cement ntawm cov theem sib thooj. Thiab L HEMC cov ntsiab lus yog 0.2% ~ 0.5%, L HEMC hloov CSA cement acceleration thiab deceleration theem maj mam ua ke, uas yog, lub thib ob exothermic ncov ua ntej thiab ua ke nrog lub thib peb exothermic ncov, nruab nrab ntawm lub dynamic tshuav nyiaj li cas theem tsis tshwm sim. , L HEMC ntawm CSA cement hydration txhawb nqa cov nyhuv tseem ceeb dua.
L HEMC txhawb nqa dej ntawm CSA cement hauv 45.0 min ~ 10.0 h. Hauv 45.0min ~ 5.0h, 0.1% L HEMC muaj kev cuam tshuam me ntsis ntawm cov dej ntawm CSA cement, tab sis thaum cov ntsiab lus ntawm L HEMC nce mus rau 0.2% ~ 0.5%, cov nyhuv tsis tseem ceeb. Qhov no txawv kiag li ntawm cov nyhuv ntawm CE ntawm hydration ntawm Portland cement. Cov ntaub ntawv tshawb fawb tau pom tias CE muaj ntau pawg hydroxyl hauv cov molecule yuav adsorbed rau saum npoo ntawm cov cement hais thiab cov khoom hydration vim acid-base kev sib cuam tshuam, yog li ncua cov dej thaum ntxov ntawm Portland cement, thiab cov adsorption muaj zog dua, qhov pom tseeb qhov ncua. Txawm li cas los xij, nws tau pom nyob rau hauv cov ntaub ntawv uas lub peev xwm adsorption ntawm CE ntawm AFt nto tsis muaj zog dua li ntawm calcium silicate hydrate (C-S-H) gel, Ca (OH) 2 thiab calcium aluminate hydrate nto, thaum lub peev xwm adsorption ntawm HEMC ntawm CSA cement particles kuj tsis muaj zog dua li ntawm Portland cement hais. Tsis tas li ntawd, cov pa oxygen atom ntawm CE molecule tuaj yeem kho cov dej dawb hauv daim ntawv ntawm hydrogen daim ntawv cog lus raws li cov dej adsorbed, hloov lub xeev ntawm cov dej evaporable hauv cov cement slurry, thiab tom qab ntawd cuam tshuam cov cement hydration. Txawm li cas los xij, qhov tsis muaj zog adsorption thiab dej nqus ntawm CE yuav maj mam ua kom tsis muaj zog nrog lub sijhawm txuas ntxiv ntawm dej. Tom qab ib lub sijhawm, cov dej adsorbed yuav raug tso tawm thiab rov ua dua nrog cov cement uas tsis muaj dej. Ntxiv mus, cov txiaj ntsig ntawm CE tuaj yeem muab qhov chaw ntev rau cov khoom siv dej. Qhov no tej zaum yuav yog vim li cas L HEMC txhawb CSA cement hydration tom qab 45.0 min hydration.
2.1.2 Kev cuam tshuam ntawm CE hloov pauv thiab nws cov degree ntawm hydration txheej txheem
Nws tuaj yeem pom los ntawm hydration heat release curves ntawm peb CE hloov CSA slurries. Piv nrog L HEMC, hydration heat release rate curves of HEC and H HEMC modified CSA slurries also have four hydration heat release peaks. Tag nrho peb CE tau ncua kev cuam tshuam ntawm kev sib cais thiab hloov pauv theem ntawm CSA cement hydration, thiab HEC thiab H HEMC muaj zog ncua kev cuam tshuam, ncua qhov tshwm sim ntawm qhov nrawm nrawm. Qhov sib ntxiv ntawm HEC thiab H-HEMC me ntsis ncua sij hawm 3rd hydration exothermic ncov, nce qib 4th hydration exothermic ncov, thiab nce lub ncov ntawm 4th hydration exothermic ncov. Hauv kev xaus, cov dej kub tso tawm ntawm peb CE hloov kho CSA slurries ntau dua li ntawm cov ntshiab CSA slurries nyob rau hauv lub sij hawm hydration ntawm 2.0 ~ 10.0 h, qhia tias peb CE tag nrho txhawb cov hydration ntawm CSA cement nyob rau theem no. Nyob rau lub sijhawm hydration ntawm 2.0 ~ 5.0 h, hydration thaum tshav kub kub tso tawm ntawm L HEMC hloov CSA cement yog qhov loj tshaj plaws, thiab H HEMC thiab HEC yog qhov thib ob, qhia tias qhov kev txhawb zog ntawm kev hloov qis HEMC ntawm hydration ntawm CSA cement muaj zog dua. . Cov nyhuv catalytic ntawm HEMC muaj zog dua li ntawm HEC, qhia tau hais tias kev qhia txog methyl pawg txhim kho cov nyhuv catalytic ntawm CE ntawm hydration ntawm CSA cement. Cov qauv tshuaj ntawm CE muaj kev cuam tshuam zoo rau nws cov adsorption ntawm cov cement hais, tshwj xeeb tshaj yog cov kev hloov pauv thiab hom kev hloov pauv.
Lub steric hindrance ntawm CE yog txawv nrog txawv substituents. HEC tsuas muaj hydroxyethyl nyob rau hauv cov saw hlau sab, uas yog me dua HEMC uas muaj methyl pawg. Yog li ntawd, HEC muaj qhov zoo tshaj plaws adsorption nyhuv ntawm CSA cement hais thiab qhov loj tshaj qhov cuam tshuam ntawm kev sib cuag cov tshuaj tiv thaiv ntawm cov cement hais thiab dej, yog li nws muaj qhov pom tseeb tshaj qhov cuam tshuam rau qhov thib peb hydration exothermic ncov. Kev nqus dej ntawm HEMC nrog kev hloov pauv siab yog qhov muaj zog dua li ntawm HEMC nrog kev hloov qis. Yog li ntawd, cov dej dawb koom nrog hauv cov tshuaj tiv thaiv hydration ntawm cov qauv flocculated raug txo, uas muaj kev cuam tshuam zoo rau kev pib dej ntawm kev hloov CSA cement. Vim li no, qhov thib peb hydrothermal ncov yog ncua. Kev hloov pauv qis HEMCs muaj qhov nqus dej tsis muaj zog thiab lub sijhawm ua haujlwm luv luv, ua rau muaj kev tso tawm ntxov ntawm cov dej adsorbent thiab ntxiv hydration ntawm ntau cov cement uas tsis muaj dej. Qhov tsis muaj zog adsorption thiab dej nqus dej muaj qhov sib txawv ncua kev cuam tshuam ntawm hydration dissolution thiab transformation theem ntawm CSA cement, uas ua rau qhov sib txawv ntawm kev nce qib ntawm cement hydration nyob rau theem tom ntej ntawm CE.
2.2 Kev tshuaj xyuas cov khoom siv dej
2.2.1 Kev cuam tshuam ntawm CE cov ntsiab lus ntawm cov khoom siv dej
Hloov TG DTG nkhaus ntawm CSA dej slurry los ntawm cov ntsiab lus sib txawv ntawm L HEMC; Cov ntsiab lus ntawm chemically khi dej ww thiab hydration khoom AFt thiab AH3 wAFt thiab wAH3 raug xam raws li TG nkhaus. Cov txiaj ntsig suav tau pom tias DTG nkhaus ntawm cov ntshiab CSA cement paste pom peb lub ncov ntawm 50 ~ 180 ℃, 230 ~ 300 ℃ thiab 642 ~ 975 ℃. Sib piv rau AFt, AH3 thiab dolomite decomposition, feem. Thaum hydration 2.0 h, TG nkhaus ntawm L HEMC hloov CSA slurry txawv. Thaum cov tshuaj tiv thaiv hydration nce mus txog 12.0 h, tsis muaj qhov sib txawv ntawm qhov nkhaus. Thaum 2.0h hydration, cov tshuaj binding dej cov ntsiab lus ntawm wL = 0%, 0.1%, 0.5% L HEMC hloov CSA cement paste yog 14.9%, 16.2%, 17.0%, thiab AFt cov ntsiab lus yog 32.8%, 35.2%, 36.7%, raws. Cov ntsiab lus ntawm AH3 yog 3.1%, 3.5% thiab 3.7%, raws li qhia tau hais tias kev koom ua ke ntawm L HEMC txhim kho qib hydration ntawm cement slurry hydration rau 2.0 h, thiab nce cov khoom hydration AFt thiab AH3, uas yog, txhawb nqa. hydration ntawm CSA cement. Qhov no yuav yog vim HEMC muaj ob pawg hydrophobic methyl thiab hydrophilic pawg hydroxyethyl, uas muaj kev ua haujlwm siab thiab tuaj yeem txo qhov nro ntawm cov kua theem hauv cov cement slurry. Nyob rau tib lub sijhawm, nws muaj cov txiaj ntsig ntawm entraining huab cua los pab txhawb kev tsim cov cement hydration khoom. Thaum 12.0 h ntawm hydration, AFt thiab AH3 cov ntsiab lus hauv L HEMC hloov CSA cement slurry thiab ntshiab CSA cement slurry tsis muaj qhov sib txawv loj.
2.2.2 Kev cuam tshuam ntawm CE hloov pauv thiab lawv qib hloov pauv ntawm cov khoom siv dej
TG DTG nkhaus ntawm CSA cement slurry hloov los ntawm peb CE (cov ntsiab lus ntawm CE yog 0.5%); Cov txiaj ntsig suav nrog ww, wAFt thiab wAH3 yog raws li hauv qab no: ntawm hydration 2.0 thiab 4.0 h, TG nkhaus ntawm cov cement slurries sib txawv heev. Thaum cov dej nce mus txog 12.0 h, TG nkhaus ntawm cov cement slurries sib txawv tsis muaj qhov sib txawv. Thaum 2.0 h hydration, chemically bound dej ntsiab lus ntawm ntshiab CSA cement slurry thiab HEC, L HEMC, H HEMC hloov CSA cement slurry yog 14.9%, 15.2%, 17.0%, 14.1%, feem. Thaum 4.0 h ntawm hydration, TG nkhaus ntawm ntshiab CSA cement slurry txo qis. Lub hydration degree ntawm peb CE hloov CSA slurries yog ntau dua li cov ntshiab CSA slurries, thiab cov ntsiab lus ntawm chemically khi dej ntawm HEMC hloov CSA slurries yog ntau dua li ntawm HEC hloov CSA slurries. L HEMC hloov kho CSA cement slurry tshuaj binding dej cov ntsiab lus yog qhov loj tshaj plaws. Hauv kev xaus, CE nrog cov khoom sib txawv thiab qib kev hloov pauv muaj qhov sib txawv tseem ceeb ntawm cov khoom lag luam hydration ntawm CSA cement, thiab L-HEMC muaj kev txhawb nqa loj tshaj plaws ntawm kev tsim cov khoom siv dej. Thaum 12.0 h hydration, tsis muaj qhov sib txawv loj ntawm qhov poob ntawm peb CE hloov CSA cement slurps thiab cov ntshiab CSA cement slurps, uas tau ua raws li cov txiaj ntsig ntawm cov cua sov tso tawm, qhia tias CE tsuas yog cuam tshuam rau cov dej ntawm cov dej. CSA cement nyob rau hauv 12.0 h.
Nws tseem tuaj yeem pom tau tias AFt thiab AH3 tus yam ntxwv ncov lub zog ntawm L HEMC hloov CSA slurry yog qhov loj tshaj plaws ntawm hydration 2.0 thiab 4.0 h. AFt cov ntsiab lus ntawm ntshiab CSA slurry thiab HEC, L HEMC, H HEMC hloov CSA slurry yog 32.8%, 33.3%, 36.7% thiab 31.0%, feem, ntawm 2.0h hydration. AH3 cov ntsiab lus yog 3.1%, 3.0%, 3.6% thiab 2.7%, feem. Thaum 4.0 h ntawm hydration, AFt cov ntsiab lus yog 34.9%, 37.1%, 41.5% thiab 39.4%, thiab AH3 cov ntsiab lus yog 3.3%, 3.5%, 4.1% thiab 3.6%, feem. Nws tuaj yeem pom tias L HEMC muaj kev txhawb zog tshaj plaws ntawm kev tsim cov khoom siv dej ntawm CSA cement, thiab kev txhawb nqa ntawm HEMC muaj zog dua li ntawm HEC. Piv nrog L-HEMC, H-HEMC tau txhim kho cov viscosity ntawm pore tov ntau dua, yog li cuam tshuam rau kev thauj dej, ua rau txo qis hauv slurry nkag mus rau tus nqi, thiab cuam tshuam rau cov khoom siv dej hauv lub sijhawm no. Piv nrog HEMCs, cov nyhuv hydrogen bonding hauv HEC molecules yog qhov pom tseeb dua, thiab cov nyhuv nqus dej muaj zog dua thiab kav ntev dua. Lub sijhawm no, cov nyhuv nqus dej ntawm ob qho tib si hloov pauv HEMCs thiab qis hloov HEMCs tsis pom tseeb lawm. Tsis tas li ntawd, CE tsim ib qho "kaw voj" ntawm kev thauj dej hauv thaj chaw me me hauv cov cement slurry, thiab cov dej tso tawm maj mam los ntawm CE tuaj yeem cuam tshuam ncaj qha nrog cov cement ib puag ncig. Thaum 12.0 h ntawm hydration, cov teebmeem ntawm CE ntawm AFt thiab AH3 zus tau tej cov CSA cement slurry tsis tseem ceeb lawm.

3. Cov lus xaus
(1) Lub hydration ntawm sulfoaluminate (CSA) sludge hauv 45.0 min ~ 10.0 h tuaj yeem txhawb nqa nrog ntau npaum li cas hydroxyethyl methyl fibrin (L HEMC).
(2) Hydroxyethyl cellulose (HEC), siab hloov hydroxyethyl methyl cellulose (H HEMC), L HEMC HEMC, peb cov hydroxyethyl cellulose ether (CE) tau ncua lub sijhawm tawg thiab hloov pauv ntawm CSA cement hydration, thiab txhawb cov dej ntawm 2.0 ~ 10.0h ib.
(3) Kev taw qhia ntawm methyl hauv hydroxyethyl CE tuaj yeem txhim kho nws txoj kev txhawb nqa ntawm cov dej ntawm CSA cement hauv 2.0 ~ 5.0 h, thiab cov nyhuv txhawb nqa ntawm L HEMC ntawm cov dej ntawm CSA cement muaj zog dua H HEMC.
(4) Thaum cov ntsiab lus ntawm CE yog 0.5%, qhov nyiaj ntawm AFt thiab AH3 tsim los ntawm L HEMC hloov CSA slurry ntawm hydration 2.0 thiab 4.0 h yog qhov siab tshaj, thiab cov nyhuv ntawm kev txhawb nqa dej yog qhov tseem ceeb tshaj plaws; H HEMC thiab HEC hloov CSA slurries tsim AFt thiab AH3 cov ntsiab lus ntau dua li cov ntshiab CSA slurries tsuas yog 4.0 h ntawm hydration. Thaum 12.0 teev ntawm hydration, cov teebmeem ntawm 3 CE ntawm cov khoom siv dej ntawm CSA cement tsis tseem ceeb lawm.