Izakhiwo Zemishini Ye-Cellulose Etere Ilungiselwe Udaka Losimende
Kulungiswe udaka lukasimende olunesilinganiso samanzi nosimende esingu-0.45, isilinganiso se-lime-sand esingu-1:2.5, ne-cellulose ether enamaviscosities ahlukene ka-0%, 0.2%, 0.4%, 0.6%, 0.8%, no-1.0% . Ngokulinganisa izakhiwo zemishini yodaka lukasimende kanye nokubheka i-morphology ye-microscopic, umphumela we-HEMC emandleni okucindezela, amandla aguquguqukayo kanye namandla esibopho sodaka oluguquliwe lukasimende lwafundwa. Imiphumela yocwaningo ibonisa ukuthi: ngokunyuka kokuqukethwe kwe-HEMC, amandla okucindezela odaka oluguquliwe eminyakeni ehlukene ayancipha ngokuqhubekayo, futhi ububanzi bokunciphisa buyancipha futhi buvame ukuba mnene; lapho okuqukethwe okufanayo kwe-cellulose ether yengezwa, Amandla acindezelayo e-cellulose ether eguquliwe yodaka olunama-viscosities ahlukene yile: HEMC20
Amagama angukhiye:i-cellulose ether; udaka lukasimende; amandla okucindezela; amandla e-flexural; amandla esibopho
1 Isingeniso
Kulesi sigaba, isidingo sonyaka sodaka emhlabeni sidlula amathani ayizigidi ezingama-200, futhi isidingo sezimboni sisakhuphuka. Njengamanje, udaka lwendabuko lukasimende luneziphambeko ezifana nokopha, i-delamination, i-shrinkage enkulu yokomisa, ukungagxili kahle, amandla ebhondi aphansi, kanye nokugeleza okungaphelele ngenxa yokulahlekelwa kwamanzi, okunzima ukukuxazulula, hhayi nje kuphela okubangela ukukhubazeka kokwakhiwa, kodwa futhi okuholelayo. ukuze kube lukhuni iPhenomena njengokuqhekeka kodaka, ukugobhoza, ukuchithwa, nokubhoboza kwenzeka.
Njengenye yezingxube ezisetshenziswa kakhulu zodaka lwezentengiselwano, i-cellulose ether inemisebenzi yokugcinwa kwamanzi, ukuqina nokuncipha, futhi ingasetshenziswa ukuthuthukisa izakhiwo ezingokoqobo zodaka lukasimende njengokusebenza, ukugcinwa kwamanzi, ukusebenza kwebhondi, kanye nesikhathi sokusetha. , njengokwandisa usimende ngokuphawulekayo. Amandla esibopho esiqinile sodaka azoncishiswa, kodwa amandla acindezelayo, amandla aguquguqukayo kanye ne-elastic modulus yodaka lukasimende kuzoncishiswa. U-Zhang Yishun nabanye bafunde umphumela we-methyl cellulose ether kanye ne-hydroxypropyl methyl cellulose ether ezindaweni zodaka. Imiphumela yabonisa ukuthi: womabili ama-cellulose ethers angathuthukisa ukugcinwa kwamanzi kodaka, futhi amandla aguquguqukayo kanye namandla okucindezela ayancipha ngamadigri ahlukene, kuyilapho isilinganiso sokugoqa namandla okubopha kodaka kukhuphuka ngamadigri ahlukene, kanye nokusebenza kokushwabana kodaka kungakwazi. kube ngcono. U-AJenni, u-R.Zurbriggen, njll. wasebenzisa amasu esimanje okuhlola nokuhlaziya ukuze atadishe ukusebenzisana kwezinto ezihlukahlukene kusistimu ye-cellulose ether eguqulelwe ungqimba oluncane olunamathelisa, futhi yabona ukuthi i-cellulose ether ne-Ca(OH) ibonakala eduze kwendawo yodaka. . 2, okubonisa ukufuduka kwama-cellulose ethers ezintweni ezisekelwe kusimende.
Kuleli phepha, kusetshenziswa izindlela zokuhlola udaka ezifana nokumelana nokucindezela, ukumelana nokuguquguquka, ukubopha, nokubukeka kwe-SEM encane, ithonya likasimende we-cellulose ether ezimpahleni zemishini ezifana namandla okucindezela, ukumelana nokuguquguquka, namandla ebhondi eminyakeni ehlukene kuyafundwa, futhi kuyachazwa. indlela yayo yokwenza.
2. Izinto ezisetshenziswayo kanye nezindlela zokuhlola
2.1 Izinto ezisetshenziswayo
2.1.1 Usimende
Usimende we-laurate ojwayelekile okhiqizwe nguWuhan Huaxin Cement Co., Ltd., imodeli P 042.5 (GB175-2007), unomthamo ongu-3.25g/cm³ kanye nendawo ethize engama-4200cm²/g.
2.1.2 I-Hydroxypropyl methylcellulose ether
Ii-hydroxyethyl methyl cellulose etherekhiqizwe i-Hercules Group yase-United States inama-viscosities angu-50000MPa/s, 100000MPa/s, kanye no-200000MPa/s kusixazululo esingu-2% ku-25.°C, kanye nezifinyezo ezilandelayo yi-HEMC5, HEMC10, kanye ne-HEMC20.
2.2 Indlela yokuhlola
a. Amandla acindezelayo odaka olushintshiwe
Amandla acindezelayo wezibonelo zomzimba oluhlaza ahlolwe ngomshini wamandla ocindezelayo we-TYE-300 ovela ku-Wuxi Jianyi Instrument Co., Ltd. Izinga lokulayisha ngu-0.5 kN/s. Ukuhlolwa kwamandla acindezelayo kwenziwa ngokuya nge-GB/T17671-1999 “Indlela Yokuhlola Amandla KaCement Mortar (Indlela Ye-ISO)”.
Ngokwencazelo, ifomula yokubala amandla acindezelayo womzimba oluhlaza ithi:
Rc=F/S
Lapho u-Rc-amandla okucindezela, i-MPa;
F-umthwalo wokuhluleka osebenza kusampula, i-kN;
S-indawo yokucindezela, m².
Ngokwencazelo, ifomula yokubala amandla aguquguqukayo womzimba oluhlaza ithi:
Rf= (3P× L)/(2b× h²) =0.234×P
Kufomula, u-Rf-amandla e-flexural, i-MPa;
P-umthwalo wokuhluleka osebenza kusampula, i-kN;
L-ibanga phakathi kwezikhungo zamasilinda asekelayo, okungukuthi, 10cm;
b, h-ububanzi nokuphakama kwesiphambano somzimba wokuhlola, womabili angama-4cm.
b. Amandla ebhondi eqinile yodaka lukasimende olushintshiwe
Sebenzisa i-ZQS6-2000 I-Adhesive Brick Adhesive Strength Detector ukukala amandla okunamathela, futhi isivinini esiqinile ngu-2mm/min. Ukuhlolwa kwamandla okubopha kwenziwa ngokusho kwe-JC/T985-2005 "udaka lokuzilinganisa olusekelwe ku-Cement for ground".
Ngokwencazelo, ifomula yokubala amandla esibopho somzimba oluhlaza ithi:
P=F/S
Kufomula, uP-amandla esibopho esiqinile, i-MPa;
F-umthwalo wokuhluleka okukhulu, N;
S-indawo yokuxhumana, mm².
3. Imiphumela kanye nengxoxo
3.1 Amandla acindezelayo
Kusukela emandleni okucindezela ezinhlobo ezimbili ze-cellulose ether eziguquliwe zodaka ezinama-viscosities ahlukene eminyakeni ehlukene, kungabonakala ukuthi ngokwanda kokuqukethwe kwe-HEMC, amandla okucindezela ama-cellulose ether aguquliwe ama-mortars eminyakeni ehlukene (3d, 7d kanye ne-28d) yehla. ngokuphawulekayo. Ukuncipha ngokuphawulekayo futhi kancane kancane kuzinzile: lapho okuqukethwe kwe-HEMC kungaphansi kwe-0.4%, amandla okucindezela ancipha kakhulu uma kuqhathaniswa nesampula engenalutho; lapho okuqukethwe kwe-HEMC kungu-0.4%~1.0%, ukuthambekela kokuncipha kwamandla okucindezela kwehle. Uma okuqukethwe kwe-cellulose ether kungaphezulu kuka-0.8%, amandla okucindezela weminyaka engu-7d no-28d aphansi kunalawo esampula elingenalutho eminyakeni engu-3d, kuyilapho amandla okucindezela odaka olulungisiwe 3d acishe abe ziro, futhi isampula icindezelwe kancane Ichotshozwa ngokushesha, ingaphakathi liyimpuphu, futhi ukuminyana kuphansi kakhulu.
Umthelela we-HEMC efanayo emandleni okucindezela odaka oluguquliwe eminyakeni ehlukene nawo uhlukile, okubonisa ukuthi amandla okucindezela we-28d ayancipha ngokunyuka kokuqukethwe kwe-HEMC ngaphezu kwalokho kwe-7d ne-3d. Lokhu kubonisa ukuthi umphumela wokunciphisa we-HEMC ubulokhu ukhona ngokukhula kweminyaka, futhi umphumela wokunciphisa we-HEMC awuzange uthinteke ekunciphiseni kwamanzi ohlelweni noma ukuqhubeka kwe-hydration reaction, okuholela ekukhuleni kwamandla okucindezela. udaka olulungisiwe lube luncane kakhulu kunalolo ngaphandle kwamasampula e-Mortar axutshwe ne-HEMC.
Kusukela ekushintsheni kwejika lamandla acindezelayo we-cellulose ether eguquliwe udaka ngeminyaka ehlukene, kungabonakala ukuthi uma inani elifanayo le-cellulose ether yengezwa, amandla okucindezela e-cellulose ether eguquliwe yodaka olunamaviscosities ahlukene ithi: HEMC20
Izici ezintathu ezilandelayo ziholela ekwehleni kwamandla okucindezela odaka oluguquliwe: ngakolunye uhlangothi, ngoba isakhiwo senethiwekhi ye-HEMC encibilikayo emanzini sihlanganisa izinhlayiya zikasimende, ijeli le-CSH, i-calcium oxide, i-calcium aluminate hydrate nezinye izinhlayiya futhi ezingenamanzi. izinhlayiya Phezulu, ikakhulukazi esigabeni sokuqala se-cement hydration, i-adsorption phakathi kwe-calcium aluminate hydrate ne-HEMC ibambezela ukusabela kwe-hydration ye-calcium aluminate, okuholela ekwehleni okukhulu kwamandla okucindezela. Umphumela wokuhlehlisa udaka oluhlala njalo uyabonakala, okubonisa ukuthi lapho okuqukethwe kwe-HEMC20 kufinyelela ku-0.8% ~ 1%, amandla angu-3d wesampula yodaka olushintshiwe anguziro; ngakolunye uhlangothi, isisombululo se-HEMC esine-hydrated sine-viscosity ephakeme, futhi i-Ngesikhathi senqubo yokuxuba udaka, ingaxutshwa nomoya ukuze kwakhiwe inani elikhulu lama-bubbles emoyeni, okuholela ekutheni kube nenani elikhulu lama-voids odakeni oluqinile. , futhi amandla okucindezela esampula ayancipha ngokuqhubekayo ngokunyuka kokuqukethwe kwe-HEMC kanye nokwanda kwe-polymerization degree yayo; Uhlelo lodaka lwandisa kuphela ukuguquguquka kodaka futhi alukwazi ukudlala indima yokusekelwa okuqinile, ngakho amandla okucindezela ayancipha.
3.2 Amandla e-Flexural
Kusukela emandleni aguquguqukayo ama-viscosity cellulose ether aguquliwe ama-morts amabili ahlukene ngeminyaka ehlukene, kungabonakala ukuthi kufana nokushintsha kwamandla okucindezela odaka oluguquliwe, amandla aguquguqukayo we-cellulose ether modified mortar ayancipha kancane kancane ngokwanda kokuqukethwe kwe-HEMC .
Kusukela ekushintsheni kwejika lamandla aguquguqukayo we-cellulose ether eguquliwe udaka ngeminyaka ehlukene, kungabonakala ukuthi uma okuqukethwe kwe-cellulose ether kufana, amandla aguquguqukayo wesampula yodaka eguquliwe ye-HEMC20 angaphansi kancane kunesampula ye-HEMC10 eguquliwe yodaka, kuyilapho Uma okuqukethwe kwe-HEMC kungu-0.4%~0.8%, amajika aguqukayo angu-28d kokubili acishe aqondane.
Kusukela ekushintsheni kwejika lamandla aguquguqukayo we-cellulose ether eguquliwe udaka ngeminyaka ehlukene, kungabonakala futhi ukuthi uguquko lwamandla aguquguqukayo odaka oluguquliwe yile: HEMC5
3.3 Amandla ebhondi
Kungabonakala kusukela kumajika aguquguqukayo wamandla ebhondi wezinsimbi ezintathu ze-cellulose ether eziguquliwe ezineminyaka ehlukene ukuthi amandla esibopho sodaka olushintshiwe akhula ngokunyuka kokuqukethwe kwe-HEMC futhi kancane kancane ajwayele ukuzinza. Ngokunwetshwa kweminyaka yobudala, amandla esibopho sodaka olushintshiwe nawo akhombisa ukuthambekela okukhulayo.
Kungabonakala kusukela kuma-curve okushintsha amandla ebhondi yezinsuku ezingama-28 wezithombo ezintathu ze-cellulose ether ezilungisiwe ukuthi amandla ebhondi odaka olushintshiwe akhuphuka ngokunyuka kokuqukethwe kwe-HEMC, futhi kancane kancane ajwayele ukuzinza. Ngesikhathi esifanayo, ngokukhuphuka kwezinga le-polymerization ye-cellulose ether, ukuguqulwa kwamandla ebhondi yodaka oluguquliwe yilokhu: HEMC20>HEMC10>HEMC5.
Lokhu kungenxa yokwethulwa kwenani elikhulu lama-pores odakeni oluguquliwe olunokuqukethwe okuphezulu kwe-HEMC, okuholela ekwandeni kwe-porosity yomzimba oqinile, ukwehla kokuqina kwesakhiwo, nokukhula kancane kwamandla esibopho. ; esivivinyweni esiqinile, ukuphuka kwenzeka odakeni oluguquliwe Ngaphakathi, akukho ukuphuka endaweni yokuxhumana phakathi kodaka oluguquliwe kanye ne-substrate, okubonisa ukuthi amandla esibopho phakathi kodaka oluguquliwe kanye ne-substrate inkulu kunaleyo eqinile. udaka olushintshiwe. Kodwa-ke, lapho inani le-HEMC liphansi (0% ~ 0.4%), ama-molecule e-HEMC ancibilikayo emanzini angakwazi ukumboza futhi ahlanganise izinhlayiya ze-samente ezinama-hydrated, futhi enze ifilimu ye-polymer phakathi kwezinhlayiya ze-cement, okwandisa ukuguquguquka nokuguquguquka udaka olushintshiwe. I-Plasticity, futhi ngenxa yokugcinwa kwamanzi okuhle kakhulu kwe-HEMC, udaka oluguquliwe lunamanzi anele okusabela kwe-hydration, okuqinisekisa ukuthuthukiswa kwamandla kasimende, futhi amandla ebhondi e-modified sement mortar anda ngokulandelana.
3.4 SEM
Kusukela ezithombeni zokuqhathanisa ze-SEM ngaphambi nangemva kwe-cellulose ether modified mortar, kungabonakala ukuthi izikhala phakathi kwezinhlamvu ze-crystal odaka olungashintshiwe zinkulu ngokuqhathaniswa, futhi inani elincane lamakristalu liyakhiwa. Odakeni oluguquliwe, amakristalu akhula ngokugcwele, ukufakwa kwe-cellulose ether kuthuthukisa ukusebenza kokugcinwa kwamanzi kodaka, usimende ugcwele amanzi ngokugcwele, futhi imikhiqizo ye-hydration iyabonakala.
Lokhu kungenxa yokuthi i-cellulose ether iye yaphathwa ngenqubo ekhethekile ye-etherification, enokusabalalisa okuhle kakhulu nokugcinwa kwamanzi. Amanzi akhishwa kancane kancane isikhathi eside, amanzi amancane kuphela aphuma ezimbotsheni ze-capillary ngenxa yokoma nokuhwamuka, futhi amanzi amaningi aphuma ngosimende ukuze kuqinisekiswe amandla odaka lukasimende oluguquliwe.
4 Isiphetho
a. Njengoba okuqukethwe kwe-HEMC kukhula, amandla okucindezela odaka oluguquliwe eminyakeni ehlukene ayancipha ngokuqhubekayo, futhi ububanzi bokunciphisa buyancipha futhi buvame ukuba flat; lapho okuqukethwe kwe-cellulose ether kukhulu kuno-0.8%, i-7d ne-28d Amandla okucindezela wesampula engenalutho yeminyaka engu-3d aphansi kunaleyo yesampula engenalutho, kuyilapho amandla okucindezela eminyaka engu-3d odaka olushintshiwe acishe abe yiziro. Isampula liyaphuka lapho icindezelwa kancane, futhi ingaphakathi liyimpushana ngokuminyana okuphansi.
b. Uma inani elifanayo le-cellulose ether yengezwa, amandla acindezelayo e-cellulose ether eguquliwe yodaka olunama-viscosity ahlukene ashintsha kanje: HEMC20
c. Amandla aguquguqukayo we-cellulose ether modified mortar ayancipha kancane kancane ngokwanda kokuqukethwe kwe-HEMC. Ushintsho lwamandla aguquguqukayo odaka oluguquliwe yilokhu: HEMC5
d. Amandla okubopha udaka oluguquliwe akhuphuka ngokwanda kokuqukethwe kwe-HEMC, futhi kancane kancane ajwayele ukuzinza. Ngesikhathi esifanayo, ngokukhuphuka kwezinga le-polymerization ye-cellulose ether, ukuguqulwa kwamandla ebhondi yodaka oluguquliwe yilokhu: HEMC20>HEMC10>HEMC5.
e. Ngemva kokuba i-cellulose ether ixutshwe odakeni lukasimende, i-crystal ikhula ngokugcwele, ama-pores phakathi kwezinhlamvu ze-crystal ayancishiswa, futhi usimende ugcwele amanzi ngokugcwele, okuqinisekisa amandla okucindezela, aguquguqukayo kanye nokubopha kodaka lukasimende.
Isikhathi sokuthumela: Jan-30-2023