Iipropati zeNgxoxo yeSement eguqulwe yi-Cellulose Ether

Ngokulinganisa iimpawu zomatshini, izinga lokugcinwa kwamanzi, ixesha lokubeka kunye nokushisa kwe-hydration ye-cellulose ether kunye ne-viscosities eyahlukeneyo kwiidosi ezahlukeneyo ze-samente yokunamathisela, kunye nokusebenzisa i-SEM ukuhlalutya iimveliso ze-hydration, umphumo we-cellulose ether ekusebenzeni kwe-cement paste. wafunda. umthetho wempembelelo. Iziphumo zibonisa ukuba ukongezwa kwe-cellulose ether kunokulibazisa i-cement hydration, ukulibazisa ukuqina kwesamente kunye nokuseta, ukunciphisa ukukhutshwa kobushushu be-hydration, ukwandisa ixesha lokubonakala kweqondo lokushisa kwe-hydration, kunye nefuthe lokunciphisa ukunyuka ngokunyuka kwedosi kunye ne-viscosity. I-ether ye-cellulose inokunyusa izinga lokugcinwa kwamanzi kwi-mortar, kwaye inokuphucula ukugcinwa kwamanzi omdaka kunye nesakhiwo esincinci, kodwa xa umxholo udlula i-0.6%, ukwanda kwesiphumo sokugcinwa kwamanzi akubalulekanga; umxholo kunye ne-viscosity zizinto ezimisela i-cellulose eguqulelwe i-cement slurry. Ekusetyenzisweni kwe-cellulose ether modified mortar, i-dosage kunye ne-viscosity kufuneka ithathelwe ingqalelo kakhulu.

Amagama angundoqo:i-cellulose ether; ithamo ukusilela; ukugcinwa kwamanzi

Udaka lokwakha sesinye sezixhobo zokwakha eziyimfuneko kwiiprojekthi zokwakha. Kwiminyaka yakutshanje, kunye nesicelo esikhulu sezinto zokugquma eludongeni kunye nokuphuculwa kweemfuno ezichasene nokuqhekeka kunye ne-anti-seepage kwiindonga zangaphandle, iimfuno eziphezulu zibekwe phambili ekuchaseni ukuqhekeka, ukudibanisa ukusebenza kunye nokusebenza kokwakhiwa kodaka. Ngenxa yokusilela kokushwabana okukhulu kokomisa, ukunganyameki kakuhle, kunye nokomelela okuphantsi kwebhondi, udaka lwemveli luhlala lungakwazi ukuhlangabezana neemfuno zokwakha, okanye lubangele iingxaki ezinjengokuwa kwemathiriyeli yokuhombisa. Njengodaka lokutyabeka, ngenxa yokuba udaka lulahlekelwa ngamanzi ngokukhawuleza, ukusetwa kunye nexesha lokuqina lifinyeziwe, kwaye iingxaki ezinjengokuqhekeka kunye nokukhupha kwenzeka ngexesha lokwakhiwa okukhulu, okuchaphazela kakhulu umgangatho weprojekthi. Udaka lwendabuko lulahlekelwa ngamanzi ngokukhawuleza kwaye i-cement hydration ayanelanga, okubangela ixesha elifutshane lokuvula udaka lwesamente, eyona nto iphambili ekuchaphazela ukusebenza kodaka.

I-ether ye-cellulose inesiphumo esihle sokuqina kunye nokugcinwa kwamanzi, kwaye isetyenziswe ngokubanzi kwintsimi yodaka, kwaye iye yaba yinto edityanisiweyo yokudibanisa ukuze kuphuculwe ukugcinwa kwamanzi odaka kunye nokubonelela ngomsebenzi wokwakha, ukunciphisa ngokufanelekileyo ukwakhiwa kunye nokusetyenziswa kodaka lwemveli. . Ingxaki yokulahleka kwamanzi phakathi. I-cellulose esetyenziswe kumdaka idla ngokubandakanya i-methyl cellulose ether (MC), i-hydroxypropyl methyl cellulose (HPMC), i-hydroxyethyl methyl cellulose ether (HEMC), i-hydroxyethyl cellulose ether (HEC), njl. Phakathi kwabo, i-HPMC kunye ne-HEMC zisetyenziswa kakhulu.

Eli phepha liphonononga kakhulu umphumo we-cellulose ether ekusebenzeni (izinga lokugcinwa kwamanzi, ukulahlekelwa kwamanzi kunye nexesha lokumisela), iimpawu zomatshini (amandla oxinzelelo kunye nokuqina kwebhondi), umthetho we-hydration kunye ne-microstructure ye-cement paste. Inika inkxaso kwiipropati ze-cellulose ether ye-cement paste eguquliweyo kwaye inikezela ngereferensi yokusetyenziswa kwe-cellulose ether modified mortar.

1. Linge

1.1 Iimathiriyeli ekrwada

Isamente: Isamente yasePortland eqhelekileyo (PO 42.5) isamente eveliswe yi Wuhan Yadong Cement Company, enendawo ethile eyi 3500 cm.²/g.

I-Cellulose ether: i-ether ye-cellulose efumaneka ngokurhweba i-hydroxypropyl methylcellulose ether (MC-5, MC-10, MC-20, viscosities ye-50,000 Pa·S, 100000 Pa·S, 200000 Pa·S, ngokulandelelana).

1.2 Indlela

Iimpawu zomatshini: Kwinkqubo yokulungiswa kwesampula, i-dosage ye-cellulose ether yi-0.0% ~ 1.0% yobunzima be-samente, kunye nomlinganiselo wamanzi-samente ngu-0.4. Ngaphambi kokufaka amanzi kunye nokuvuselela, xuba i-cellulose ether kunye ne-samente ngokulinganayo. Intlama yesamente enesampulu yobukhulu be-40 x 40 x 40 yayisetyenziselwa uvavanyo.

Ixesha lokumisela: Indlela yokulinganisa iqhutywe ngokwe-GB / T 1346-2001 "Ukusetyenziswa koMgangatho we-Cement Consistency Consistency Water, ixesha lokubeka, iNdlela yoVavanyo lokuZinza".

Ukugcinwa kwamanzi: Uvavanyo lokugcinwa kwamanzi kwi-cement paste lubhekisela kwi-DIN 18555 eqhelekileyo "Indlela yokuvavanya i-inorganic cementitious material mortar".

Ubushushu be-hydration: Uvavanyo lwamkela i-TAM Air microcalorimeter ye-TA Instrument Company yase-United States, kwaye umlinganiselo we-samente wamanzi ngu-0.5.

Imveliso ye-Hydration: Gqugquzela amanzi kunye ne-cellulose ether ngokulinganayo, emva koko ulungise i-samente slurry, qalisa ixesha, thatha iisampulu ngamaxesha ahlukeneyo, uyeke ukukhupha amanzi nge-ethanol epheleleyo yokuvavanya, kwaye umlinganiselo wesamente wamanzi ngu-0.5.

2. Iziphumo kunye nengxoxo

2.1 Iipropati zoomatshini

Ukususela kwimpembelelo ye-cellulose ether content kumandla, kunokubonwa ukuba ngokunyuka kwe-MC-10 umxholo we-cellulose ether, amandla e-3d, i-7d kunye ne-28d yonke iyancipha; i-cellulose ether inciphisa amandla e-28d ngakumbi. Ukususela kwimpembelelo ye-cellulose ether viscosity kumandla, kunokubonwa ukuba ingaba i-cellulose ether ene-viscosity ye-50,000 okanye i-100,000 okanye i-200,000, amandla e-3d, i-7d, kunye ne-28d iya kuncipha. Kwakhona kunokubonwa ukuba i-cellulose ether Viscosity ayinayo impembelelo ebalulekileyo kumandla.

2.2 Ukumisela ixesha

Ukususela kwisiphumo somxholo we-100,000 viscosity cellulose ether ngexesha lokumisela, kunokubonwa ukuba ngokunyuka komxholo we-MC-10, zombini ixesha lokuqala lokumisela kunye nexesha lokugqibela lokumisela ukunyuka. Xa umxholo u-1%, ixesha lokuqala lokumisela Lifike kwi-510min, kwaye ixesha lokugqibela lokumisela lafikelela kwi-850min. Xa kuthelekiswa nokungenanto, ixesha lokuqala lokumisela landiswa yi-210min, kwaye ixesha lokugqibela lokumisela landiswa yi-470min.

Ukusuka kwimpembelelo ye-cellulose ether viscosity ngexesha lokubeka, kunokubonwa ukuba ingaba yi-MC-5, MC-10 okanye i-MC-20, inokulibazisa ukusetwa kwesamente, kodwa xa kuthelekiswa ne-ethers ezintathu ze-cellulose, ukusetwa kokuqala. ixesha kunye nesetingi yokugqibela Ixesha likhula ngokunyuka kwe-viscosity. Oku kungenxa yokuba i-ether ye-cellulose inokubhengezwa kumphezulu wamasuntswana e-samente, ngaloo ndlela ikhusela amanzi ukuba angadibanisi namasuntswana e-samente, ngaloo ndlela alibazisa ukuhanjiswa kwesamente. Ubukhulu be-viscosity ye-cellulose ether, i-adsorption layer ingqindilili kumphezulu wamasuntswana e-samente, kwaye ibaluleke ngakumbi isiphumo sokubuyiswa.

2.3 Izinga logcino lwamanzi

Ukususela kumthetho wempembelelo ye-cellulose ether umxholo kwizinga lokugcinwa kwamanzi, kunokubonwa ukuba ngokunyuka komxholo, izinga lokugcinwa kwamanzi kwi-mortar liyenyuka, kwaye xa umxholo we-cellulose ether mkhulu kune-0.6%, izinga lokugcinwa kwamanzi liphezulu. uzinzile kummandla. Nangona kunjalo, xa kuthelekiswa ne-ethers ezintathu ze-cellulose, kukho ukungafani kwimpembelelo ye-viscosity kwizinga lokugcinwa kwamanzi. Ngaphantsi kwedosi efanayo, ubudlelwane phakathi kwezinga lokugcinwa kwamanzi: MC-5≤MC-10≤MC-20.

2.4 Ubushushu behydration

Ukususela kwisiphumo sohlobo lwe-cellulose ether kunye nomxholo kubushushu be-hydration, kunokubonwa ukuba ngokunyuka komxholo we-MC-10, ubushushu obugqithiseleyo be-hydration buyancipha ngokuthe ngcembe, kwaye ixesha lobushushu be-hydration litshintsha kamva; Ubushushu be-hydration nabo bunempembelelo enkulu. Ngokunyuka kwe-viscosity, ukushisa kwe-hydration kwehla kakhulu, kwaye ukuphakama kweqondo lokushisa kwe-hydration kwatshintsha kakhulu kamva. Ibonisa ukuba i-cellulose ether inokulibazisa i-cement hydration, kwaye umphumo wayo wokunciphisa uhambelana nomxholo kunye ne-viscosity ye-cellulose ether, ehambelana nesiphumo sohlalutyo lokumisela ixesha.

2.5 Uhlalutyo lweemveliso ze-hydration

Ukususela kuhlalutyo lwe-SEM yemveliso ye-1d ye-hydration, kunokubonwa ukuba xa i-0.2% MC-10 i-cellulose ether yongezwa, inani elikhulu le-clinker e-unhydrated kunye ne-ettringite ene-crystallization engcono ingabonwa. I-%, i-crystals ye-ettringite iyancipha kakhulu, ebonisa ukuba i-cellulose ether inokulibazisa i-hydration ye-samente kunye nokwakhiwa kweemveliso ze-hydration ngexesha elifanayo. Ngokuthelekisa ezi ntlobo zintathu ze-cellulose ethers, kunokufunyanwa ukuba i-MC-5 inokwenza i-crystallization ye-ettringite kwiimveliso ze-hydration rhoqo, kwaye i-crystallization ye-ettringite iqhelekile. ezinxulumene nobukhulu bomaleko.

3. Isiphelo

a. Ukongezwa kwe-cellulose ether kuya kulibazisa i-hydration yesamente, ukulibazisa ukuqina kunye nokusekwa kwesamente, ukunciphisa ukukhutshwa kobushushu be-hydration, kunye nokwandisa ixesha lokubonakala kweqondo lokushisa kwe-hydration. Ngokunyuka kwedosi kunye ne-viscosity, umphumo wokubuyisela uya kwanda.

b. I-ether ye-cellulose inokunyusa izinga lokugcinwa kwamanzi kwi-mortar, kwaye inokuphucula ukugcinwa kwamanzi kwi-mortar kunye nesakhiwo esincinci. Ukugcinwa kwayo kwamanzi kuhambelana nedosi kunye ne-viscosity. Xa i-dosage idlula i-0.6%, umphumo wokugcinwa kwamanzi awunyuki kakhulu.