Cellulose ether pane self-leveling mortar

Migumisiro yehydroxypropyl methyl cellulose etherpamusoro pemvura, kuchengetwa kwemvura uye kusimba kwekubatanidza kwedhaka rekuzvimisa-leveling zvakadzidzwa. Mhedzisiro yacho inoratidza kuti HPMC inogona kunyatso kuvandudza kuchengetwa kwemvura yedhaka inodzika-yega uye kuderedza kuenderana kwedhaka. Kuunzwa kweHPMC kunogona kuvandudza kusimba kwechisungo chedhaka, asi iyo yekumanikidza simba, kuchinjika simba uye fluidity zvakaderedzwa. SEM bvunzo yekusiyanisa yakaitwa pamasampuli, uye mhedzisiro yeHPMC painodzoreredza mhedzisiro, kuchengetedza mvura uye simba redhaka zvakatsanangurwa zvakare kubva kune hydration kosi simende pa3 uye 28 mazuva.

Mazwi akakosha:self-leveling mortar; Cellulose ether; Fluidity; Kuchengetedza mvura

0. Nhanganyaya

Iyo yekuzvimisa-leveling dhaka inogona kuvimba nehuremu hwayo kuti igadzire hwaro hwakatsetseka, hwakatsetseka uye hwakasimba pane substrate, kuitira kuisa kana kubatanidza zvimwe zvinhu, uye inogona kuita nzvimbo yakakura yekuvaka kwehunyanzvi hwekuvaka, saka, yakakwira liquidity is a. chinhu chakakosha zvikuru chedhaka rinozvimisa; Kunyanya sevhoriyamu yakakura, yakasimbiswa dense kana gap isingasviki 10 mm kudzosera kumashure kana kusimbisa kushandiswa kwezvinhu zvegrouting. Pamusoro pemvura yakanaka, dhaka rinozvimisa rinofanirwa kunge riine kumwe kuchengetedza mvura uye kusimba kwechisungo, kusabuda ropa kwekusarura chiitiko, uye kuve nehunhu hweadiabatic uye kuderera kwekushisa kukwira.

Kazhinji, dhaka rekuzvimisa rinoda mvura yakanaka, asi iyo chaiyo fluidity ye simende slurry inowanzova 10 ~ 12 cm chete. Kuzvimisa-leveling dhaka kunogona kuzvigadzirisa, uye nguva yekutanga yekumisikidza yakareba uye nguva yekupedzisira yekumisa ipfupi. Cellulose ether ndeimwe yezvinonyanya kuwedzera zvedhaka rakagadzirwa, kunyange zvazvo mari yekuwedzera yakaderera zvikuru, asi inogona kuvandudza zvakanyanya kushanda kwedhaka, inogona kuvandudza kuwirirana kwedhaka, kushanda kwekushanda, kushanda kwekubatanidza uye kuchengetedza mvura, ine. basa rinokosha zvikuru mumunda wedhaka rakagadzirwa rakagadzirwa.

1. Raw materials uye nzira dzekutsvakurudza

1.1 Raw Materials

(1) Kazhinji P · O 42.5 giredhi simende.

(2) Jecha zvinhu: Xiamen yakashambidzwa jecha regungwa, particle size i 0.3 ~ 0.6mm, mvura inokwana 1% ~ 2%, kuomeswa kwekugadzira.

(3) Cellulose ether: hydroxypropyl methyl cellulose ether ndiyo chigadzirwa chehydroxyl chinotsiviwa ne methoxy uye hydroxypropyl, maererano, ine viscosity ye300mpa·s. Parizvino, yakawanda ye cellulose ether inoshandiswa ihydroxypropyl methyl cellulose ether uye hydroxyethyl methyl cellulose ether.

(4) superplasticizer: polycarboxylic acid superplasticizer.

(5) Redispersible latex powder: HW5115 series inogadzirwa naHenan Tiansheng Chemical Co., Ltd. is redispersible latex powder copolymerized by VAC/VeoVa.

1.2 Nzira dzekuedza

Muedzo wakaitwa zvinoenderana neindasitiri chiyero JC/T 985-2005 "Cement-based Self-leveling Mortar for Ground Use". Nguva yekumisa yakatemwa nekureva kuenderana kwakajairwa uye nguva yekuisa yeJC/T 727 simende paste. Self-leveling mortar specimen forming, bending and compressive strength test inoreva GB/T 17671. Nzira yekuedza yesimba rebhondi: The 80mmx80mmx20mm mortar test block inogadzirirwa mberi, uye zera rayo rinopfuura 28d. Iyo yepamusoro inoomeswa, uye mvura yakazara pamusoro inopukutwa mushure me 10min wetting. Iyo dhaka yekuyedza chidimbu inodururwa panzvimbo yakakwenenzverwa nehukuru hwe40mmx40mmx10mm. Bond simba rinoedzwa pazera rekugadzira.

Scanning electron microscopy (SEM) yakashandiswa kuongorora morphology yezvinhu zvakasimbiswa mune slurry. Muchidzidzo chacho, nzira yekusanganiswa yezvinhu zvose zvehupfu ndeye: kutanga, zvinhu zvehupfu zvechikamu chimwe nechimwe zvakasanganiswa zvakaenzana, uye zvino kuwedzerwa kumvura yakarongwa yekusanganiswa kweyunifomu. Mhedzisiro ye cellulose ether padhaka yekuzvimisa yakaongororwa nesimba, kuchengetedza mvura, fluidity uye SEM microscopic bvunzo.

2. Migumisiro uye kuongorora

2.1 Kufamba

Cellulose ether ine yakakosha mhedzisiro pakuchengetedza mvura, kuenderana uye kuita kwekuvaka kweself leveling mortar. Kunyanya sedhaka rinozvimisa-leveling, fluidity ndeimwe yema indexes makuru ekuongorora mashandiro edhaka rekuzvimisa. Pachikonzero chekuva nechokwadi chekuumbwa kwedhaka, kunyunguduka kwedhaka kunogona kugadziriswa nekushandura zvinyorwa zve cellulose ether.

Nekuwedzera kwe cellulose ether content. Kuyerera kwedhaka kunoderera zvishoma nezvishoma. Kana iyo dosi iri 0.06%, fluidity yedhaka inoderera neanopfuura 8%, uye kana dosi iri 0.08%, fluidity inoderera neinopfuura 13.5%. Panguva imwecheteyo, nekuwedzera kwezera, chiyero chepamusoro chinoratidza kuti huwandu hweselulosi ether hunofanira kudzorwa mukati meimwe chiyero, yakawandisa dosage ichaunza mhedzisiro yakaipa pamatope fluidity. Mvura uye simende mudhaka zvinogadzira tsvina yakachena yekuzadza jecha mukaha, uye inoputira jecha kuti iite basa rekuzora, kuitira kuti dhaka rive nehumwe mvura. Nekuiswa kwe cellulose ether, zvinyorwa zvemvura yakasununguka muhurongwa zvakaderedzwa, uye jira rekuputira pamadziro ekunze ejecha rakaderedzwa, nokudaro kuderedza kuyerera kwedhaka. Nekuda kwechido chekuzvimisa-leveling dhaka ine yakakwira fluidity, huwandu hweselulosi ether hunofanirwa kudzorwa mune inonzwisisika renji.

2.2 Kuchengeta Mvura

Kuchengetwa kwemvura kwedhaka indekisi yakakosha yekuyera kugadzikana kwezvikamu mudhaka resimende richangobva kusanganiswa. Kuwedzera huwandu hwakakodzera hweselulosi ether kunogona kuvandudza kuchengetwa kwemvura kwedhaka. Kuti uite iyo hydration reaction ye simenti zvinhu zvizere, inonzwisisika huwandu hweselulosi ether inogona kuchengetedza mvura mudhaka kwenguva yakareba kuti ive nechokwadi chekuti hydration reaction yesimende zvinhu inogona kuitwa zvizere.

Cellulose ether inogona kushandiswa sechinhu chinochengetedza mvura nekuti maatomu eokisijeni ari pahydroxyl neether bond anodyidzana nemamorekuru emvura kuumba hydrogen bond, zvichiita kuti mvura yemahara ive mvura yakasanganiswa. Inogona kuonekwa kubva kuhukama huri pakati pezvinyorwa zve cellulose ether uye chiyero chekuchengetedza mvura yedhaka iyo mvura yekuchengetedza mvura yedhaka inowedzera nekuwedzera kwehuwandu hwe cellulose ether. Mvura-inochengetedza mhedzisiro ye cellulose ether inogona kudzivirira iyo substrate kuti irege kutora yakawandisa uye inokurumidza mvura, uye kudzivirira kubuda kwemvura, nokudaro kuve nechokwadi chekuti slurry nharaunda inopa mvura yakakwana yesamende hydration. Panewo zvidzidzo zvinoratidza kuti kunze kwehuwandu hwe cellulose ether, viscosity yayo (molecular uremu) inewo simba guru pakuchengetedza mvura yedhaka, iyo yakakura viscosity, zviri nani kuchengetedza mvura. Cellulose ether ine viscosity ye400 MPa·S inowanzo shandiswa pakuita dhaka rekuzvimisa, iro rinogona kuvandudza kuita kwedhaka nekuvandudza kusimba kwedhaka. Kana iyo viscosity inopfuura 40000 MPa · S, kuchengetwa kwemvura kunenge kusisagadziriswe zvakanyanya, uye haina kufanira kuzvidzora dhaka.

Muchidzidzo ichi, sampuli dzedhaka ine cellulose ether uye dhaka isina cellulose ether yakatorwa. Chikamu chemasampuli chaive 3d zera samples, uye imwe chikamu 3d zera samples dzakajairwa dzakaporeswa 28d, uyezve kuumbwa kwesimende hydration zvigadzirwa mumasampuri kwakaedzwa neSEM.

Zvigadzirwa zve hydration zvesimende mumuenzaniso usina chinhu wesampu yedhaka pazera re3d zvakawanda kupfuura izvo zviri mumuenzaniso ne cellulose ether, uye pazera remakore 28d, zvigadzirwa zve hydration mumuenzaniso ne cellulose ether zvakanyanya kudarika izvo zviri mumuenzaniso usina chinhu. Iyo yekutanga hydration yemvura inononoka nekuti kune yakaoma firimu layer inoumbwa ne cellulose ether pamusoro pemasimende esimende padanho rekutanga. Zvisinei, nekuwedzera kwezera, iyo hydration process inoenderera zvishoma nezvishoma. Panguva ino, kuchengetwa kwemvura ye cellulose ether pane slurry kunoita kuti pave nemvura yakakwana muslurry kuti isangane nezvinodiwa zve hydration reaction, izvo zvinoita kuti kufambira mberi kuzere kwe hydration reaction. Naizvozvo, kune zvimwe zvigadzirwa zve hydration mune slurry pane inotevera nhanho. Zvichienderana, kune yakawanda yemahara mvura mumuenzaniso usina chinhu, iyo inogona kugutsa mvura inodiwa nekutanga simende kuita. Nekudaro, nekufambira mberi kweiyo hydration process, chikamu chemvura mumuenzaniso chinopedzwa nekutanga hydration reaction, uye chimwe chikamu chinorasika nekubuda, zvichikonzera kusakwana kwemvura mune yakatevera slurry. Naizvozvo, iyo 3d hydration zvigadzirwa mune isina chinhu sampuli yakawanda. Huwandu hwezvigadzirwa zve hydration ishoma pane huwandu hwezvigadzirwa zve hydration mumuenzaniso une cellulose ether. Naizvozvo, kubva pakuona kwezvigadzirwa zve hydration, zvinotsanangurwa zvakare kuti kuwedzera huwandu hwakakodzera hweselulosi ether kudhaka kunogona kuvandudza kuchengetwa kwemvura kweslurry.

2.3 Kuisa nguva

Cellulose ether ine kumwe kudzoreredza padhaka, nekuwedzera kwe cellulose ether zvirimo. Nguva yekugadzika yedhaka inobva yarebeswa. Iko kudzoreredza mhedzisiro ye cellulose ether inoenderana zvakananga nemaitiro ayo ekuumbwa. Cellulose ether ine dehydrated glucose ring structure, iyo inogona kugadzira shuga calcium molecular complex gedhi ine calcium ions mu simenti hydration solution, kuderedza kuwanda kwe calcium ions mu simenti hydration induction nguva, kudzivirira kuumbwa uye kunaya kweCa (OH) 2 uye calcium munyu. makristasi, kuitira kunonoka hydration process ye simenti. Kudzoreredza kuita kwe cellulose ether pane simende slurry kunonyanya kuenderana nedanho rekutsiva alkyl uye ine hukama hushoma nehuremu hwayo hwemamorekuru. Iyo idiki iyo inotsiva dhigirii yealkyl, iyo yakakura zvirimo muhydroxyl, zvakanyanya kuoneka kudzoreredza maitiro. L. Semitz et al. aitenda kuti cellulose ether mamorekuru ainyanya kushambadzirwa pane zvigadzirwa zve hydration seC - S - H uye Ca (OH) 2, uye kashoma kushambadzirwa pamaminerari ekutanga clinker. Yakasanganiswa neSEM kuongororwa kwecement hydration process, inowanikwa kuti cellulose ether ine kumwe kudzoreredza mhedzisiro, uye iyo yakakwira zvirimo mu cellulose ether, zvakanyanya kuoneka kunonoka kweiyo yakaoma firimu layer pakutanga hydration ye simenti, saka, iyo zviri pachena kunonoka kuita.

2.4 Flexural simba uye kumanikidza simba

Kazhinji, simba ndeimwe yeakakosha ekuongorora indexes ye simende-yakavakirwa simende zvinhu zvinorapa maitiro emusanganiswa. Pamusoro pekuita kwepamusoro kuyerera, dhaka rekuzvimisa-leveling rinofanirwawo kunge riine rimwe simba rekumanikidza uye simba rekuchinja. Muchidzidzo ichi, 7 uye 28 mazuva anodzvinyirira simba uye flexural simba revhu risina chinhu rakasanganiswa ne cellulose ether zvakaedzwa.

Nekuwedzera kwe cellulose ether yemukati, dhaka rinomanikidza simba uye flexural simba rinoderedzwa mune akasiyana amplitude, zvirimo zvidiki, pesvedzero pasimba haisi pachena, asi nezviri mukati zvinopfuura 0.02%, kurasikirwa kwesimba kukura kuri pachena. , saka, mukushandiswa kwe cellulose ether kuvandudza dhaka rekuchengetedza mvura, asiwo funga nezvekuchinja kwesimba.

Zvikonzero zvekumanikidza dhaka uye flexural simba kuderera. Inogona kuongororwa kubva pane zvinotevera. Chekutanga, simba rekutanga uye nekukurumidza kuomesa simenti haina kushandiswa muchidzidzo. Apo dhaka rakaoma rakasanganiswa nemvura, mamwe cellulose ether rubber powder particles akatanga adsorbed pamusoro pezvikamu zvesimende kuti zvigadzire latex firimu, iyo yakanonoka hydration ye simenti uye kuderedza simba rekutanga rematope matrix. Chechipiri, kuitira kutevedzera nharaunda yekushanda yekugadzirira dhaka rekuzvimisa panzvimbo, zvienzaniso zvese muchidzidzo hazvina kuzunguzika mugadziriro yekugadzirira nekuumba, uye zvakavimba nekuzviremera. Nekuda kwesimba rakasimba rekuchengetedza mvura ye cellulose ether mudhaka, nhamba huru yemapores yakasara mumatrix mushure mekuoma kwedhaka. Kuwedzera kweporosity mudhaka zvakare chikonzero chakakosha chekudzikira kwekumanikidza uye kushanduka kwesimba redhaka. Mukuwedzera, mushure mekuwedzera cellulose ether mudhaka, zvinyorwa zvepolymer inoshanduka mumapores edhaka inowedzera. Kana iyo matrix yakatsikirirwa, iyo inoshanduka polymer yakaoma kutamba yakaomesesa kutsigira basa, iyo inokanganisawo kuita kwesimba kwematrix kune imwe nhanho.

2.5 Kusimba kwekubatana

Cellulose ether ine simba guru pane inosungirirwa pfuma yedhaka uye inoshandiswa zvakanyanya mukutsvagisa nekugadzirira dhaka rinozvimisa.

Apo zvinyorwa zve cellulose ether zviri pakati pe 0.02% ne0.10%, simba rezvisungo zvedhaka rinonyatsovandudzwa, uye simba rezvisungo pamazuva e28 rakakwirira kudarika iro pamazuva manomwe. Cellulose ether inoumba firimu repolymer rakavharwa pakati pesimende hydration particles uye liquid phase system, iyo inosimudzira mvura yakawanda mufirimu yepolymer kunze kwezvikamu zvesimende, iyo inobatsira kumvura yakakwana ye simenti, kuitira kuti ivandudze kusimba kwechisungo chepaste. mushure mekuoma. Panguva imwecheteyo, huwandu hwakakodzera hweselulosi ether hunowedzera purasitiki uye kuchinjika kwedhaka, kunoderedza kuomarara kwenzvimbo yekuchinja pakati pedhaka uye substrate interface, inoderedza kutsvedza kushushikana pakati peiyo interface, uye inosimudzira hukama pakati pedhaka uye substrate mukati. mwero wakati. Nekuda kwekuvapo kwe cellulose ether mune simende slurry, yakakosha interfacial transition zone uye interfacial layer inoumbwa pakati pemateki edhaka uye hydration zvigadzirwa. Iyi interfacial layer inoita kuti iyo interfacial transition zone iwedzere kushanduka uye kushomeka, kuitira kuti dhaka rive nesimba rekubatanidza.

3. Mhedziso neKukurukurirana

Cellulose ether inogona kuvandudza kuchengetwa kwemvura yedhaka rinozvimisa. Nekuwedzera kwehuwandu hwe cellulose ether, kuchengetwa kwemvura kwedhaka kunowedzerwa zvishoma nezvishoma, uye dhaka remvura uye nguva yekuisa inoderedzwa kusvika kune imwe nhanho. Kunyanya kuchengetwa kwemvura kuchawedzera porosity yekuomesa slurry, izvo zvinogona kuita kuti kumanikidza uye kuchinjika simba redhaka rakaoma kuve nekurasikirwa kuri pachena. Muchidzidzo chacho, simba rakadzikira zvakanyanya apo dosage yaive pakati pe0.02% uye 0.04%, uye iyo yakawanda yakawanda ye cellulose ether, zvakanyanya kuoneka kudzoreredza mhedzisiro. Naizvozvo, kana uchishandisa cellulose ether, zvinodikanwawo kuti utarise zvizere ma mechanic properties ye self-leveling mortar, zvine musoro kusarudzwa kwedosi uye synergistic effect pakati payo nezvimwe zvinhu zvemakemikari.

Kushandiswa kwe cellulose ether kunogona kuderedza simba rekumanikidza uye kushanduka kwesimba resimende slurry, uye kunatsiridza kusimba kwekubatanidza kwedhaka. Kuongororwa kwezvikonzero zvekuchinja kwesimba, zvakanyanya kukonzerwa nekushandurwa kwezvigadzirwa zvidiki uye chimiro, kune rumwe rutivi, cellulose ether rubber poda zvimedu zvakatanga kushambadzirwa pamusoro pemasimende, kuumbwa kwelatex firimu, kunonoka hydration. simenti, iyo ichaita kuti kurasikirwa kwekutanga kwesimba re slurry; Kune rimwe divi, nekuda kweiyo firimu inogadzira mhedzisiro uye kuchengetedza kwemvura mhedzisiro, inobatsira kune yakazara hydration ye simenti uye kuvandudzwa kwesimba rebhondi. Munyori anotenda kuti marudzi maviri aya ekuchinja kwesimba anonyanya kuvepo mumuganhu wenguva yekumisikidza, uye kufambira mberi nekunonoka kweiyi muganhu kungave chinhu chakakosha chinokonzeresa ukuru hwemhando mbiri dzesimba. Kuongorora kwakadzama uye kwakarongeka kweiyi pfungwa yakakosha ichave yakanakira kudzora zvirinani uye kuongororwa kweiyo hydration maitiro eiyo simende zvinhu mune slurry. Zvinobatsira kugadzirisa huwandu hwe cellulose ether uye nguva yekurapa zvinoenderana nekudiwa kwedhaka mechanical properties, kuitira kuti uvandudze kushanda kwedhaka.