Hydroxypropyl methylcellulose ether pane ether yenhunzi ash mortar

Mhedzisiro yehydroxypropyl methylcellulose ether pazvimiro zvenhunzi ash mortar yakadzidzwa, uye hukama pakati pekunyorova uye kusimba kwesimba kwakaongororwa. Mhedzisiro yemhedzisiro inoratidza kuti kuwedzera hydroxypropyl methylcellulose ether kubhururuka madota dhaka kunogona kuvandudza zvakanyanya kuchengetedzwa kwemvura kwedhaka, kuwedzera nguva yekubatanidza yedhaka, uye kuderedza kunyorova uye kusimba kwesimba redhaka. Pane kuwirirana kwakanaka pakati pekunyorova kwemvura uye iyo 28d yekumanikidza simba. Pasi pemamiriro ekuzivikanwa kunyorova density, iyo 28d yekumanikidza simba inogona kuverengerwa nekushandisa yakakodzera fomula.

Mazwi akakosha:fly ash; cellulose ether; kuchengetedza mvura; compressive simba; kuwirirana

Parizvino, madota enhunzi ave achishandiswa zvakanyanya mukugadzira engineering. Kuwedzera imwe huwandu hwenhunzi madota mudhaka haingonatsiridze michina uye kusimba kwedhaka, asi zvakare kuderedza mutengo wedhaka. Nekudaro, iyo fly ash mortar inoratidza kusakwana kwekuchengetedza mvura, saka nzira yekuvandudza kuchengetwa kwemvura yedhaka rave dambudziko rekukurumidzira kugadziriswa. Cellulose ether ndeyepamusoro-inoshanda musanganiswa unowanzoshandiswa kumba nekune dzimwe nyika. Inongoda kuwedzerwa muhushoma kuti ive nesimba guru pane zviratidzo zvekushanda zvakadai sekuchengetedza mvura uye kudzvinyirira simba rematope.

1. Raw zvinhu uye nzira dzekuyedza

1.1 Raw zvinhu

Simende iP·O 42.5 giredhi yakajairika Portland simende inogadzirwa neHangzhou Meiya Cement Factory; dota renhunzi ndiro giredhiⅡash; jecha ijecha rakajairika riri pakati nepakati nefineness modulus ye2.3, huwandu hwakawanda hwe1499kg.·m-3, uye mwando we0.14%, madhaka ari 0.72%; hydroxypropyl methyl cellulose ether (HPMC) inogadzirwa neShandong Heda Co., Ltd., iyo mhando ndeye 75HD100000; mvura inosanganiswa imvura yepombi.

1.2 Kugadzirira kwedhaka

Paunenge uchisanganisa cellulose ether yakagadziridzwa dhaka, tanga wasanganisa HPMC nesamende uye unyatsobhururuka madota, wobva waoma sanganisa nejecha kwemasekonzi makumi matatu, wobva wawedzera mvura uye sanganisa kwete asingasviki 180 seconds.

1.3 Nzira yekuedza

Kusagadzikana, kunyorova kwemvura, delamination uye nguva yekumisikidza yedhaka ichangobva kusanganiswa ichayerwa zvinoenderana nemirairo yakakodzera muJGJ70-90 "Basic Performance Test Methods of Building Motar". Kuchengetedzwa kwemvura kwedhaka kunotarirwa maererano nekuedza nzira yekuchengetedza mvura yedhaka muAppendix A yeJG / T 230-2007 "Ready Mixed Mortar". Iyo yekumanikidza simba bvunzo inotora 70.7mm x 70.7mm x 70.7mm cube bottomed test mold. Iyo yakaumbwa test block inorapwa pakupisa kwe (20±2)°C kwemaawa makumi maviri nemana, uye mushure mekudhonzwa, inoenderera mberi ichirapwa munzvimbo ine tembiricha ye (20).±2)°C uye hunyoro hunopfuura 90% kusvika kuzera rakafanotemerwa, maererano neJGJ70-90 "Kuvaka Mortar Basic performance test nzira" kutsunga kwesimba rayo rekumanikidza.

2. Migumisiro yekuedza uye kuongorora

2.1 Wet density

Inogona kuonekwa kubva paukama huri pakati pehuwandu uye huwandu hweHPMC kuti kunyorova kunoderera zvishoma nezvishoma nekuwedzera kwehuwandu hweHPMC. Kana huwandu hweHPMC huri 0.05%, kunyorova kwedhaka kuri 96.8% yebhenji dhaka. Kana huwandu hweHPMC huchiramba huchiwedzera, Iko kuderera kwekumhanya kwekunyorova kunokwidziridzwa. Kana zviri mukati meHPMC zviri 0.20%, kunyorova kwedhaka kunongori 81.5% yebhenji dhaka. Izvi zvinonyanya kukonzerwa nemhepo-entraining mhedzisiro yeHPMC. Iwo akaunzwa mabhuru emhepo anowedzera porosity yedhaka uye kuderedza kusimba, zvichikonzera kudzikira kwehuwandu hwehuwandu hwedhaka.

2.2 Kuisa nguva

Inogona kuonekwa kubva paukama huri pakati penguva yekubatanidza uye chiyero cheHPMC iyo nguva yekubatanidza inowedzera zvishoma nezvishoma. Kana iyo dosi iri 0.20%, nguva yekumisikidza inowedzera ne29.8% kana ichienzaniswa neyereferenzi dhaka, inosvika pa300min. Zvinogona kuonekwa kuti kana dosi iri 0.20%, nguva yekuisa ine shanduko huru. Chikonzero ndechekuti L Schmitz et al. tenda kuti cellulose ether mamorekuru anonyanya kushambadzirwa pane zvigadzirwa zve hydration senge cSH uye calcium hydroxide, uye haawanzo kushambadzwa pane yekutanga mineral phase ye clinker. Mukuwedzera, nekuda kwekuwedzera kwe viscosity ye pore solution, cellulose ether inoderera. Kufamba kwemaion (Ca2+, so42-…) mupore solution kunowedzera kunonoka iyo hydration process.

2.3 Kuisa uye kuchengetedza mvura

Dzese dhigirii re delamination uye kuchengetwa kwemvura zvinogona kuratidza kuchengetwa kwemvura kwedhaka. Kubva pahukama huri pakati pedhigirii re delamination uye huwandu hweHPMC, zvinogona kuonekwa kuti dhigirii re delamination rinoratidza kuderera kwemaitiro sezvo huwandu hweHPMC hunowedzera. Kana zvirimo zveHPMC zviri 0.05%, dhigirii re delamination rinoderera zvakanyanya, zvichiratidza kuti kana zvirimo zvefiber ether zviri diki, dhigirii re delamination rinogona kuderedzwa zvakanyanya, mhedzisiro yekuchengetwa kwemvura inogona kuvandudzwa, uye kushanda uye kushanda. kushanda kwedhaka kunogona kuvandudzwa. Tichitarisa kubva kuhukama pakati pemidziyo yemvura nehuwandu hweHPMC, sezvo huwandu hweHPMC hunowedzera, kuchengetwa kwemvura zvakare zvishoma nezvishoma kunova nani. Kana iyo dosi iri pasi pe 0.15%, iyo yekuchengeta mvura inowedzera zvinyoro nyoro, asi kana dosi yasvika 0.20%, iyo yekuchengeta mvura yakagadziridzwa zvakanyanya, kubva pa90.1% apo dosi iri 0.15%, kusvika 95%. Huwandu hweHPMC hunoramba huchiwedzera, uye kuita kwekuvaka kwedhaka kunotanga kuipa. Naizvozvo, tichifunga nezvekuita kwekuchengetedza mvura uye kuita kwekuvaka, huwandu hwakakodzera hweHPMC ndeye 0.10% ~ 0.20%. Kuongororwa kwemaitiro ayo ekuchengetedza mvura: Cellulose ether imvura inonyungudika organic polymer, iyo yakakamurwa kuita ionic uye isiri-ionic. HPMC isiri-ionic cellulose ether ine hydrophilic boka, hydroxyl boka (-OH) uye ether bond (-0-1) mumaitiro ayo ekugadzirisa. Kana yakanyungudutswa mumvura, maatomu eokisijeni paboka re hydroxyl uye ether bond nemvura Molecules inobatanidza kuumba hydrogen zvisungo, izvo zvinoita kuti mvura irasikirwe nehuturu hwayo, uye mvura yakasununguka haisati yasununguka, nokudaro inobudirira mugumisiro wekuchengetedza kwemvura uye kukora.

2.4 Kudzvinyirira simba

Kubva pahukama huri pakati pesimba rekumanikidza uye huwandu hweHPMC, zvinogona kuonekwa kuti nekuwedzera kwehuwandu hweHPMC, simba rekumanikidza re7d uye 28d rakaratidza kuderera kwemaitiro, izvo zvakanyanya kukonzerwa nekuiswa kwenhamba huru. yemhepo inoputika neHPMC, iyo yakawedzera zvakanyanya porosity yedhaka. kuwedzera, zvichikonzera kuderera kwesimba. Kana zviri mukati zviri 0.05%, iyo 7d yekumanikidza simba inodonha zvakanyanya, simba rinodonha ne 21.0%, uye iyo 28d yekumanikidza simba inodonha ne26.6%. Zvinogona kuoneka kubva pakona kuti kukanganisa kweHPMC pasimba rekumanikidza kuri pachena. Kana muyero wacho uri muduku zvikuru, uchaderedzwa zvikuru. Nokudaro, mukushanda kwekushanda, chiyero chayo chinofanira kudzorwa uye kushandiswa pamwe chete ne defoamer. Kuongorora chikonzero, Guan Xuemao et al. tenda kuti chekutanga, kana cellulose ether yawedzerwa mudhaka, iyo inochinjika yepolymer mumatope pores inowedzerwa, uye aya anochinjika mapolymers nemapores haakwanise kupa tsigiro yakasimba kana chivharo chebvunzo chamanikidzwa. Iyo composite matrix inenge isina simba, nokudaro kuderedza simba rekumanikidza redhaka; chechipiri, nekuda kwemvura yekuchengetedza mhedzisiro ye cellulose ether, mushure meiyo dhaka test block yakaumbwa, yakawanda yemvura inoramba iri mudhaka, uye iyo chaiyo mvura-simende reshiyo yakaderera pane iyo isina Izvo zvakakura zvakanyanya, saka iyo inomanikidza simba. yedhaka ichaderedzwa zvakanyanya.

2.5 Hukama pakati pekumanikidza simba uye kunyorova kwemvura

Zvinogona kuonekwa kubva pahukama hwehukama pakati pesimba rekumanikidza uye kunyorova kwemvura kuti mushure mekukodzera mutsara kwemapoinzi ese mumufananidzo, mapoinzi anoenderana akagovaniswa zvakanaka kumativi ese emutsetse wakakodzera, uye pane kuwirirana kwakanaka pakati pekunyorova uye kumanikidza. simba zvivakwa, uye kunyorova kwemvura kuri nyore uye kuri nyore kuyera, saka iyo yekumanikidza simba redhaka 28d inogona kuverengerwa kuburikidza neyakagadzika mutsara wakakodzera equation. Mutsetse wakakodzera equation inoratidzwa mufomula (1), R²=0.9704. Y=0.0195X-27.3 (1), apo, y ndiyo 28d inotsikirira simba redhaka, MPa; X ndiko kunyorova kwemvura, kg m-3.

3. Mhedziso

HPMC inogona kuvandudza mhedzisiro yemvura yekuchengeta dhaka renhunzi uye kuwedzera nguva yekushanda yedhaka. Panguva imwecheteyo, nekuda kwekuwedzera kweporosity yedhaka, huwandu hwayo huzhinji uye simba rekumanikidza richadonha zvakanyanya, saka chiyero chakakodzera chinofanira kusarudzwa mukushandiswa. Iyo 28d yekumanikidza simba redhaka ine hukama hwakanaka nehunyoro density, uye iyo 28d yekumanikidza simba inogona kuverengerwa nekuyera kunyorova density, iyo ine yakakosha referensi kukosha kwehutongi hwemhando yedhaka panguva yekuvaka.