Mhedzisiro yeHydroxypropyl Methyl Cellulose Ether paZvinhu zveMuchina Wakapfapfaidzwa Cement Motar.

Cellulose ether chinhu chakakosha chekuwedzera mudhaka rakaputika nemuchina. Mhedzisiro yezvina zvakasiyana-siyana viscosities yehydroxypropyl methylcellulose (HPMC) pakuchengetedza mvura, density, air content, mechanical properties uye pore saizi kugoverwa kwemashini-yakaputika dhaka zvakadzidzwa. Zvidzidzo zvakaratidza kuti: HPMC inogona kuvandudza zvakanyanya kuchengetedza kwemvura kwedhaka, uye chiyero chekuchengetedza mvura chinogona kudarika 90% kana huwandu hweHPMC huri 0.15%. Chinonyanya kuoneka; iyo mhepo yedhaka inowedzera nekuwedzera kwehuwandu hweHPMC: HPMC ichave ichidzikisa ma mechanical properties ye simenti mortar, asi kupeta chiyero chedhaka chichawedzera; iyo pore saizi yedhaka ichawedzera zvakanyanya mushure mekuwedzera HPMC, Chikamu chemakomba anokuvadza uye akawanda anokuvadza maburi akawedzera zvakanyanya.

Mazwi akakosha: mortar; hydroxypropyl methylcellulose ether; kuchengetedza mvura; pore saizi kugovera

0. Nhanganyaya

Mumakore achangopfuura, nekuenderera mberi kwekufambira mberi kweindastiri uye kuvandudzwa kwehunyanzvi, kuburikidza nekutanga uye kuvandudzwa kwemichina yekunze yekupfapfaidza dhaka, tekinoroji yekupfapfaidza uye kupurasita yakagadziridzwa zvakanyanya munyika yedu. Mechanical yekupfapfaidza dhaka yakasiyana nedhaka rakajairwa, iro rinoda kukwirira kwekuchengetedza mvura kuita, kuyerera kwakakodzera uye kumwe kupikisa-sagging kuita. Kazhinji, cellulose ether inowedzerwa mudhaka, pakati peiyo hydroxypropyl methylcellulose Plain ether (HPMC) ndiyo inonyanya kushandiswa. Mabasa makuru eHPMC mudhaka ndeaya: yakanakisa kuchengetedza mvura, kukora uye viscosifying uye rheological kugadzirisa. Nekudaro, izvo zvikanganiso zveHPMC hazvigone kufuratirwa. HPMC ine mweya-entraining mhedzisiro, izvo zvinokonzeresa hurema hwemukati uye zvakanyanya kuderedza ma mechanic properties yedhaka. Iri bepa rinoongorora pesvedzero yeHPMC pachiyero chekuchengetedza mvura, density, mhepo yemukati uye mechaniki zvimiro zvedhaka kubva kune macroscopic aspect, uye inodzidza pesvedzero yeHPMC pane pore chimiro chedhaka kubva kune microscopic chikamu.

1. Muedzo

1.1 Raw zvinhu

Simende: inotengeswa P·O42.5 simende, ayo 28d flexural uye compressive simba ari 6.9 uye 48.2 MPa zvichiteerana; jecha: Chengde yakanaka rwizi jecha, 40-100 mesh; cellulose ether: hydroxypropyl doro rinogadzirwa nekambani muHebei Methyl cellulose ether, chena poda, zita rekuti viscosity 40, 100, 150, 200 Pa.·S: Mvura: mvura yemupombi yakachena.

1.2 Nzira yekuedza

Maererano neJGJ/T 105-2011 "Mitemo yekuvaka yeMechanical Spraying uye Plastering", kuwirirana kwedhaka ndeye 80 ~ 120mm, uye chiyero chekuchengetedza mvura chinopfuura 90%. Muyedzo iyi, iyo lime-jecha reshiyo inoiswa pa1: 5, kuwirirana kunodzorwa pa (93).±2) mm, uye cellulose ether inosanganiswa kunze, uye chiyero chayo chinotarwa zvichienderana nesamende yakawanda. Izvo zvakakosha zvimiro zvedhaka senge kunyorova kwemvura, mhepo, chiyero chekuchengetedza mvura, uye kusimba kunoedzwa maererano neJGJ 70-2009 "Nzira dzekuedza dzeBasic Properties yeKuvaka Mortar", uye zvirimo zvemhepo zvinoedzwa uye kuverengerwa zvinoenderana ne density nzira. Kugadzirira, flexural uye compressive simba miedzo yezvienzaniso yakaitwa maererano neGB/T 17671-1999 "Nzira dzekuedza Kusimba kweCement Mortar Sand (ISO Method)". Saizi yepore yakaedzwa nemercury porosimetry. Iyo modhi yemercury porosimeter yaive AUTOPORE 9500, uye yekuyera renji yaive 5.5 nm kusvika 360.μm. Huwandu hwe4 seti dzebvunzo dzakaitwa. 0, 0.1%, 0.2%, 0.3% (nhamba ndiA, B, C, D).

2. Migumisiro uye Analysis

2.1 Mhedzisiro yeHPMC pachiyero chekuchengetedza mvura yedhaka resimende

Kuchengeta mvura zvinoreva kugona kwedhaka kubata mvura. Mumuchina wakapfapfaidzwa dhaka, kuwedzera cellulose ether kunogona kunyatso chengetedza hunyoro, kuderedza kubuda kweropa, uye kusangana nezvinodiwa zve hydration yakakwana yesimende-yakavakirwa zvinhu.

Kubva pakuita kweHPMC pachiyero chekuchengetedza mvura yedhaka, zvinogona kuonekwa kuti nekuwedzera kwehuwandu hweHPMC, chiyero chekuchengetedza mvura chedhaka chinowedzera zvishoma nezvishoma. Iwo macurves e cellulose ether ane viscosities ye100, 150 uye 200 Pa.·s dzakafanana. Kana zvirimo zviri 0.05% kusvika 0.15%, mwero wekuchengetedza mvura unowedzera mutsara. Kana zvirimo zviri 0.15%, mwero wekuchengetedza mvura unodarika 93%..Mushure me20%, maitiro ekuwedzera ekuchengetedza mvura anova flat, zvichiratidza kuti huwandu hweHPMC hwava pedyo nekuzara. Iyo pesvedzero curve yehuwandu hweHPMC ine viscosity ye40 Pa·s pachiyero chekuchengetedza mvura inenge mutsara wakatwasuka. Kana huwandu hwacho hwakakura kupfuura 0.15%, mwero wekuchengetedza mvura yedhaka wakadzikira zvakanyanya pane wemamwe matatu marudzi eHPMC ane huwandu hwakafanana hwekuona. Zvinowanzotendwa kuti nzira yekuchengetedza mvura ye cellulose ether ndeiyi: boka rehydroxyl pa cellulose ether molecule uye atomu yeokisijeni pane ether bond ichabatana nemorekuru wemvura kuumba hydrogen bond, kuitira kuti mvura yakasununguka inova yakasungwa mvura. , nokudaro kutamba zvakanaka kuchengetedza mvura; Zvinotendwawo kuti kupindirana pakati pemamorekuru emvura uye cellulose ether molecular cheni inobvumira mamorekuru emvura kuti apinde mukati me cellulose ether macromolecular cheni uye ave pasi pemasimba akasimba ekusunga, nekudaro anovandudza kuchengetwa kwemvura esimende slurry. Kuchengetedzwa kwemvura kwakanakisa kunogona kuchengetedza dhaka riine homogeneous, isiri nyore kupatsanura, uye kuwana yakanaka yekusanganisa kuita, uku ichideredza kupfeka kwemechani uye kuwedzera hupenyu hwemushini wekupfapfaidza dhaka.

2.2 Mhedzisiro yeHPMC pane density uye mhepo yemukati yesamende dhaka

Kubva pakupesvedzerwa kweakasiyana viscosities uye dosages yeHPMC pane density yedhaka, zvinogona kuoneka kuti kana dosi yeHPMC iri 0-0.20%, kuwanda kwedhaka kunoderera zvakanyanya nekuwedzera kweHPMC dosage, kubva 2050 kg/m.³ kusvika 1650kg/m³ , yakaderera neinenge 20%; mushure meiyo HPMC yemukati inodarika 0.20%, kudzikira kwe density kunowanzo kuve kwakapfava. Kuenzanisa marudzi mana eHPMC ane viscosities yakasiyana, zvinogona kuonekwa kuti iyo yakakwirira viscosity, iyo yakaderera density yedhaka; iyo density curves yematope ane yakasanganiswa viscosities ye150 uye 200 Pa s HPMC inopindirana, zvichiratidza kuti sezvo viscosity yeHPMC iri kuramba ichiwedzera, kuwanda kwedhaka hakuchadziki.

Kubva pakupesvedzerwa kwemaviscosities akasiyana uye dosages yeHPMC pane yemhepo yedhaka, zvinogona kuoneka kuti shanduko yemhepo yemukati medhaka inopesana neiyo density yedhaka. Huwandu hwemhepo hunenge huchikwira mumutsara wakatwasuka; kana iyo HPMC yemukati ichipfuura 0.20%, iyo mhepo yemukati haichinji, zvichiratidza kuti mhepo-inopinza mhedzisiro yedhaka iri pedyo nekuzara. Mhepo-entraining mhedzisiro yeHPMC ine viscosity ye150 uye 200 Pa·s yakakura kupfuura iyo yeHPMC ine viscosity ye40 uye 100 Pa·s.

Mhepo-entraining mhedzisiro ye cellulose ether inonyanya kutsanangurwa neiyo molecular chimiro. Cellulose ether ine ese ari maviri hydrophilic mapoka (hydroxyl, ether mapoka) uye hydrophobic mapoka (methyl groups, glucose mhete), uye ari surfactant. , ine kushanda kwepamusoro, nokudaro kuva nemhepo-intraining effect. Kune rumwe rutivi, gasi rakaunzwa rinogona kuita sebhora rinotakura mudhaka, kuvandudza kushanda kwedhaka, kuwedzera vhoriyamu, uye kuwedzera kuburitsa, izvo zvinobatsira kumugadziri. Asi kune rumwe rutivi, mhepo-intraining effect inowedzera mhepo yehutu uye porosity mushure mekuoma, zvichiita kuti kuwedzerwa kwezviputi zvinokuvadza uye kuderedza zvakanyanya mechanical properties. Kunyangwe HPMC iine imwe mweya-entraining maitiro, haigone kutsiva mhepo-inopinza mumiriri. Mukuwedzera, apo HPMC uye air-entraining agent inoshandiswa panguva imwe chete, iyo inopinza mhepo inogona kukundikana.

2.3 Mhedzisiro yeHPMC pamichina yesamende dhaka

Kubva pa28d flexural simba uye 28d compressive simba, zvinogona kuonekwa kuti kana huwandu hweHPMC huri 0.05% chete, simba rekushanduka kwevhu rinoderera zvakanyanya, iyo inenge 25% yakaderera pane iyo yemuenzaniso usina chinhu pasina HPMC, uye simba rekumanikidza rinogona kungosvika 65% yemuenzaniso usina chinhu. 80%. Kana zvirimo zveHPMC zvichidarika 0.20%, dhigirii rekuderera kwesimba rekuchinjika uye kumanikidza simba redhaka hazvisi pachena. Iyo viscosity yeHPMC haina mhedzisiro pamichina yedhaka. HPMC inounza tutubu tudiki twemhepo, uye mhepo-inopinza muvhu padhaka inowedzera porosity yemukati uye inokuvadza pores yedhaka, zvichikonzera kuderera kukuru kwesimba rekumanikidza uye flexural simba. Chimwe chikonzero chekuderera kwesimba redhaka ndiko kuchengetedza mvura kweselulosi ether, iyo inochengeta mvura mudhaka rakaoma, uye chiyero chikuru chemvura-binder chinokonzera kuderera kwesimba rekuedza block. For mechanical kuvaka dhaka, kunyange cellulose ether anogona zvikuru kuwedzera mvura kuchengetwa mwero dhaka uye kunatsiridza kushanda kwayo, kana uwandu hwakakurisa, zvichaita zvakakomba kukanganisa michina zvinhu dhaka, saka ukama pakati maviri anofanira kuyerwa zvinonzwisisika.

Kubva pamakumi maviri nemasere ekupeta reshiyo, zvinogona kuoneka kuti nekuwedzera kweiyo HPMC yemukati, iyo yakazara kupeta reshiyo yedhaka inoratidza maitiro ari kuwedzera, ayo ari hukama hwemutsara. Izvi ndezvokuti iyo yakawedzerwa cellulose ether inotanga nhamba yakawanda yemhepo inoputika, zvichiita kuti kukanganisa kwakawanda mukati medhaka, zvichiita kuti kuderera kwakanyanya kwesimba rekumanikidza redhaka, uye kunyange zvazvo simba rekushanduka-shanduka rinodererawo kune imwe nhanho; asi iyo cellulose ether inogona kuvandudza kushanduka kwedhaka uye kuramba Simba rekupeta rakanaka, izvo zvinoita kuti kuderera kuderera. Tichifunga zvakazara, iyo yakasanganiswa mhedzisiro yezviviri inoguma nekuwedzera kweiyo kupeta reshiyo.

2.4 Mhedzisiro yeHPMC pane pore saizi yedhaka

Iyo pore saizi yekugovera macurves emapoka mana emasampuli A, B, C uye D akayerwa nemercury intrusion porosimetry.

Zvinoenderana neiyo pore saizi yekugovera curve, pore saizi yekugovera data uye akasiyana manhamba ma paramita e AD samples, HPMC ine simba guru pane pore chimiro chesimende dhaka:

(1) Mushure mekuwedzera HPMC, saizi yepore yesamende dhaka inowedzera zvakanyanya. Pane pore saizi yekugovera curve, nzvimbo yemufananidzo inoenda kurudyi, uye kukosha kwepore kunoenderana nehukoshi hwepamusoro hunova hombe. Zvakare kubva kuhuwandu hwehuwandu hwekugovera saizi yepore uye yepakati pore saizi mumhedzisiro yebvunzo yeakasiyana manhamba paramita, zvinogona kuoneka kuti yepakati pore saizi yesamende dhaka mushure mekuwedzera HPMC yakakura zvakanyanya kupfuura iyo yesampuli isina chinhu, uye mumuenzaniso une 0.3% dosage Kukosha kwekuvhara ndeye 2 mirairo yehukuru yakakwirira kupfuura iyo yemuenzaniso usina chinhu.

(2) Wu Zhongwei et al. akakamura mapores mukongiri mumarudzi mana, ayo asingakuvadzi pores (≤20 nm), mashoma anokuvadza pores (20-100 nm), zvinokuvadza pores (100-200 nm) uye akawanda anokuvadza pores (≥200 nm). 200 nm). Kubva pane pore saizi yekugovera nhamba yedata uye mhedzisiro yekuyedzwa yeakasiyana manhamba paramita, zvinogona kuoneka kuti huwandu hweasingakuvadzi pores kana mashoma anokuvadza pores akadzikiswa zvakanyanya, uye huwandu hweanokuvadza pores kana mamwe anokuvadza pores anowedzerwa mushure mekuwedzera HPMC. Izvo zvisingakuvadzi kana zvishoma zvinokuvadza pores zvemuenzaniso pasina HPMC zvinenge 49.4%, uye zvisingakuvadzi kana zvishoma zvinokuvadza pores zvakaderedzwa zvakanyanya mushure mekuwedzera HPMC. Kutora dosage ye0.1% semuenzaniso, iyo isingakuvadzi kana isina kukuvadza pores inoderedzwa neanenge 45%. , nhamba yemapores anokuvadza akakura kupfuura gumiμm yakawedzera kanenge ka9.

3) Iyo yepakati pore dhayamita, avhareji pore dhayamita, chaiyo pore vhoriyamu uye chaiyo nzvimbo yepasi haiteveri yakasimba kwazvo shanduko mutemo nekuwedzera kweiyo HPMC yemukati, iyo inogona kuve yakabatana nekupararira kukuru kwekusarudzwa kwemuenzaniso mune mercury jekiseni bvunzo. Asi pazere, iyo yepakati pore dhayamita, avhareji pore dhayamita uye chaiyo pore vhoriyamu yesampuli yakasanganiswa neHPMC inowanzo wedzera kana ichienzaniswa neyakashama sampuli, nepo nzvimbo chaiyo inodzikira.

3. Mhedziso

(1) Mwero wekuchengetedza mvura yedhaka unowedzera nekuwedzera kweHPMC yemukati. Macurves e cellulose ether ane viscosities ye100, 150 uye 200 Pa.·S zvakangofanana, uye mwero wekuchengetedza mvura wakakura kupfuura 93% kana zvirimo zviri 0.15%. Kana zviri mukati 40 Pa·s cellulose ether yakakura kupfuura 0.15%, mwero wekuchengetedza mvura wakadzikira pane wemamwe marudzi matatu eviscosity HPMC.

(2) Kuwanda kwedhaka kunoderera zvishoma nezvishoma nekuwedzera kweHPMC zvinyorwa, uye zviri mukati 0.05%. Density kuderera ndiyo inonyanya kuoneka pa 0.20%, inenge 20%; kana zvirimo zvinodarika 0.20%, density haichinji; iyo mhepo yemukati yedhaka inowedzera nekuwedzera kweHPMC yemukati.

(3) Kuwedzera kweiyo HPMC yemukati kunozove kudzikisa ma mechanic zvimiro zvesamende dhaka, asi inoenderana kupeta reshiyo yedhaka ichawedzera, uye kuchinjika kwedhaka kuchava nani.

(4) Mushure mekuwedzera HPMC, saizi yepore yedhaka inowedzera zvakanyanya, uye chikamu chepores chinokuvadza uye akawanda anokuvadza pores anowedzera zvakanyanya. Sample ine 0.1% HPMC yemukati yakaderedzwa inosvika makumi mana neshanu muzana kana ichienzaniswa neyakashama sampuli isina kana zvishoma inokuvadza pores, uye huwandu hweanokuvadza pores akakura kupfuura gumi.μm yakawedzera kanenge ka9.