Cellulose Ether uye Starch Ether paZvivakwa zveDry-Mixed Motar

Zviyero zvakasiyana zve cellulose ether uye starch ether zvakasanganiswa kuita dhaka rakaoma-musanganiswa, uye kusachinja-chinja, kunooneka density, kudzvanya simba uye kusungirirwa kwesimba redhaka zvakadzidzwa kuyedza. Mhedzisiro yacho inoratidza kuti cellulose ether uye starch ether inogona kuvandudza zvakanyanya mashandiro edhaka, uye kana ikashandiswa mukuyerwa kwakaringana, kuita kwakazara kwedhaka kuchava nani.

Mazwi akakosha: cellulose ether; starch ether; yakaoma-yakasanganiswa dhaka

Doka rechinyakare rine zvakaipira kubuda ropa nyore, kuputika, uye simba rakaderera. Hazvisi nyore kuzadzisa zvinodiwa zvemhando yepamusoro zvivakwa, uye zviri nyore kukonzera ruzha uye kusvibiswa kwezvakatipoteredza panguva yekugadzira. Nekuvandudzwa kwezvinodiwa nevanhu pakuvaka mhando uye nharaunda yezvakatipoteredza, dhaka rakasanganiswa-yakasanganiswa rine mashandiro ari nani rave richishandiswa zvakanyanya. Dry-mixed dhaka, inozivikanwawo seyakaoma-yakasanganiswa dhaka, chigadzirwa chehafu-chakapedzwa chakasanganiswa necementitious zvinhu, zvakaunganidzwa zvakanaka, uye zvakasanganiswa mune imwe chikamu. Inotakurwa kunzvimbo yekuvaka mumabhegi kana muhuwandu hwekusanganiswa nemvura.

Cellulose ether uye starch ether ndiwo maviri anonyanyozivikanwa musanganiswa wedhaka rekuvaka. Cellulose ether ndiyo yakakosha unit chimiro cheanhydroglucose inowanikwa kubva kune yakasikwa cellulose kuburikidza ne etherification reaction. Iyo inonyungudika nemvura polymer zvinhu uye inowanzoita semafuta ekuzora mudhaka. Uyezve, inogona kuderedza kukosha kwekuenderana kwedhaka, kuvandudza kushanda kwedhaka, kuwedzera chiyero chekuchengetedza mvura yedhaka, uye kuderedza mukana wekuputika kwekuputira kwedhaka. Starch ether is starch substituent ether inoumbwa nekuita kwemapoka ehydroxyl mumamorekuru estarch ane zvinhu zvinoshanda. Iyo ine yakanaka kwazvo yekukurumidza kukora kugona, uye yakaderera dosi inogona kuwana mhedzisiro yakanaka. Inowanzosanganiswa ne cellulose mumatope ekuvaka Shandisa ne ether.

1. Kuedza

1.1 Raw zvinhu

Simende: Ishii P·O42.5R simende, yakajairwa kuenderana kushandiswa kwemvura 26.6%.

Jecha: jecha repakati, fineness modulus 2.7.

Cellulose ether: hydroxypropyl methylcellulose ether (HPMC), viscosity 90000MPa·s (2% aqueous solution, 20°C), yakapihwa neShandong Yiteng New Material Co., Ltd.

Starch ether: hydroxypropyl starch ether (HPS), yakapihwa neGuangzhou Moke Building Materials Technology Co., Ltd.

Mvura: mvura yepombi.

1.2 Nzira yekuedza

Zvinoenderana nemaitiro akataurwa mu "Standards for Basic Performance Test Methods of Building Mortar" JGJ/T70 uye "Technical Regulations for Plastering Mortar" JGJ/T220, kugadzirira kwemasamples uye kutariswa kwemaitiro ekuita kunoitwa.

Muchiyedzo ichi, kushandiswa kwemvura kweiyo bhenji dhaka DP-M15 inotarwa nekuenderana kwe98mm, uye dhaka reshiyo simenti: jecha: mvura = 1: 4: 0.8. Muyero we cellulose ether mudhaka ndeye 0-0.6%, uye chiyero che starch ether i 0-0.07%. Nekuchinja chiyero che cellulose ether uye starch ether, zvinoonekwa kuti shanduko yemuyero weiyo admixture ine mhedzisiro padhaka. kukanganisa pakuita kwakabatana. Zviri mukati me cellulose ether uye starch ether inoverengerwa sechikamu chesement mass.

2. Migumisiro yekuedza uye kuongorora

2.1 Miedzo mhinduro uye ongororo yeimwe-doped admixture

Zvinoenderana nereshiyo yechirongwa chekuyedza chataurwa pamusoro apa, chiyedzo chakaitwa, uye mhedzisiro yeimwe-yakasanganiswa admixture pakuenderana, inooneka density, kumanikidza simba uye kusungirirwa kwesimba remusanganiswa wakaoma-musanganiswa wakawanikwa.

Tichiongorora mhedzisiro yebvunzo yeimwe-kusanganisa admixtures, zvinogona kuonekwa kuti kana starch ether yakasanganiswa yega, kuwirirana kwedhaka kunoderera nguva dzose kana ichienzaniswa nebenchmark dhaka nekuwedzera kwehuwandu hwe starch ether, uye inooneka density ye dhaka richawedzera nekuwedzera kwehuwandu. Inodzikira, asi inogara yakakura kupfuura iyo benchmark dhaka inooneka density, dhaka 3d uye 28d inomanikidza simba icharamba ichidzikira, uye inogara iri pasi peiyo benchmark dhaka inomanikidza simba, uye kune indekisi yesimba rekubatanidza, pamwe nekuwedzera kwestarch ether inowedzera, simba rechisungo rinotanga rawedzera uye rozodzikira, uye rinogara rakakura kudarika kukosha kwebhenji dhaka. Kana cellulose ether yakasanganiswa ne cellulose ether chete, sezvo huwandu hwe cellulose ether hunowedzera kubva ku0 kusvika 0.6%, kuwirirana kwedhaka kunoderera nguva dzose kana ichienzaniswa nedhaka rereferensi, asi haisi pasi pe90mm, iyo inovimbisa kuvakwa kwakanaka kweiyo. dhaka, uye inooneka density ine Panguva imwecheteyo, simba rekumanikidza re3d uye 28d rakaderera pane iro rereferensi dhaka, uye inoderera nguva dzose nekuwedzera kweiyo dosage, nepo kusungirirwa kwesimba kunovandudzwa zvakanyanya. Kana iyo dosage ye cellulose ether iri 0.4% , iyo dhaka yekubatanidza simba ndiyo yakakura, inopeta kaviri iyo benchmark mortar bonding simba.

2.2 Mhedzisiro yebvunzo yemusanganiswa musanganiswa

Zvinoenderana neiyo dhizaini musanganiswa reshiyo mune admixture reshiyo, iyo yakasanganiswa admixture mortar sampu yakagadzirwa uye yakaedzwa, uye mhedzisiro yedhaka kusachinja-chinja, inooneka density, compressive simba uye bonding simba zvakawanikwa.

2.2.1 Mhedzisiro yemusanganiswa wekomboni pakuenderana kwedhaka

Iyo consistency curve inowanikwa zvinoenderana nemhedzisiro yebvunzo yekusanganisa admixtures. Zvinogona kuonekwa kubva pane izvi kuti kana chiyero che cellulose ether chiri 0.2% kusvika 0.6%, uye chiyero che starch ether chiri 0.03% kusvika 0.07%, iyo miviri inosanganiswa mumatope Pakupedzisira, nekuchengetedza huwandu hweimwe. yezvakasanganiswa, kuwedzera kuwanda kweimwe musanganiswa kuchaita kuti kuderera kwekuenderana kwedhaka. Sezvo cellulose ether uye starch ether zvimiro zvine hydroxyl mapoka uye ether zvisungo, maatomu ehydrogen pamapoka aya uye mamorekuru emvura akasununguka mumusanganiswa anogona kugadzira mabhondi ehydrogen, kuitira kuti mvura yakawanda yakasungwa ioneke mudhaka uye inoderedza kuyerera kwedhaka. , zvichiita kuti kukosha kwekuenderana kwevhu kuderera zvishoma nezvishoma.

2.2.2 Mhedzisiro yekusanganisa musanganiswa pane inooneka density yedhaka

Kana cellulose ether nestarch ether zvasanganiswa mudhaka pane imwe dosi, kuzara kwedhaka kunoshanduka. Zvinogona kuonekwa kubva pane zvabuda kuti kusanganiswa kwe cellulose ether uye starch ether pachiyero chakagadzirwa Mushure medhaka, kuoneka kwedhaka kunoramba kuri pa1750kg/m.³, nepo density inooneka yedhaka rereferenzi iri 2110kg/m³, uye kusanganiswa kwezviviri mudhaka kunoita kuti density inooneka idonhe ne17%. Zvinogona kuonekwa kuti kusanganisa cellulose ether uye starch ether kunogona kunyatso dzikisa kuoneka kwedhaka uye kuita kuti dhaka rireruke. Izvi zvinodaro nekuti cellulose ether uye starch ether, sezvigadzirwa zveetherification, masanganiswa ane simba rakasimba rekuita mhepo. Kuwedzera aya maviri akasanganiswa kune dhaka kunogona kuderedza zvakanyanya kuwanda kwedhaka.

2.2.3 Mhedzisiro yemusanganiswa wemusanganiswa pasimba rekumanikidza redhaka

Iyo 3d uye 28d inomanikidza simba macurves edhaka anowanikwa kubva kune zvakabuda mukuyedzwa kwevhu. Masimba ekumanikidza ebenchmark mortar 3d uye 28d ari 15.4MPa uye 22.0MPa, zvichiteerana, uye mushure mekunge cellulose ether uye starch ether yasanganiswa mudhaka, masimba ekumanikidza edhaka 3d uye 28d ari 12.8MPa uye 19.3MP zvakateerana, izvo, vakaderera pane vasina maviri. Benchmark mortar ine musanganiswa. Kubva pane simba remisanganiswa yekomboni pane simba rekumanikidza, zvinogona kuonekwa kuti zvisinei kuti nguva yekurapa i3d kana 28d, simba rekumanikidzika redhaka rinoderera nekuwedzera kwehuwandu hwekusanganiswa kwe cellulose ether uye starch ether. Izvi zvinodaro nekuti mushure mekusanganiswa kwe cellulose ether uye starch ether, ma latex particles anozoita mutete mutete wepolymer isina mvura ne simenti, izvo zvinotadzisa kuyerera kwe simende uye kuderedza kusimba kwesimba redhaka.

2.2.4 Kufurira kwemusanganiswa wakasanganiswa pane bond simba redhaka

Inogona kuonekwa kubva mukukanganiswa kwe cellulose ether uye starch ether pane inonamira simba redhaka mushure mekunge dosi rakagadzirwa rasanganiswa uye rakasanganiswa mudhaka. Kana chiyero che cellulose ether chiri 0.2% ~ 0.6%, chiyero che starch ether chiri 0.03% ~ 0.07% %, mushure mokunge maviri acho akabatanidzwa mudhaka, nekuwedzera kwehuwandu hwezviviri, simba rekubatanidza re dhaka richawedzera zvishoma nezvishoma kutanga, uye mushure mekusvika kune imwe kukosha, nekuwedzera kwehuwandu hwehuwandu, simba rekunamatira revhu richawedzera zvishoma nezvishoma. Simba rekubatanidza richadzikira zvishoma nezvishoma, asi richiri rakakura kupfuura kukosha kweiyo benchmark mortar bonding simba. Kana ichisanganiswa ne 0.4% cellulose ether uye 0.05% starch ether, simba rekubatanidza redhaka rinosvika pakakwirira, iyo inenge 1.5 nguva yakakwirira kudarika iyo yebhenji yedhaka. Zvisinei, kana chiyero ichipfuudzwa, kwete chete viscosity yevhu yakakura zvikuru, kuvakwa kwakaoma, asiwo kusungirirwa kwesimba kwedhaka kunoderedzwa.

3. Mhedziso

(1) Zvose cellulose ether uye starch ether zvinogona kuderedza zvakanyanya kuwirirana kwedhaka, uye mugumisiro uchava nani kana maviri akashandiswa pamwe chete muhuwandu hwakati.

⑵Nokuti etherification chigadzirwa chine simba rakasimba rekuita kwemhepo, mushure mekuwedzera cellulose ether uye starch ether, pachava negasi rakawanda mukati medhaka, kuitira kuti mushure mekuwedzera cellulose ether uye starch ether, iyo yakanyorova pamusoro pedhaka ichaita Density inooneka ichave. zvakaderedzwa zvakanyanya, izvo zvinozoita kuti kuderedzwa kunoenderana mukudzvinyirira simba redhaka.

(3) Imwe chiyero che cellulose ether uye starch ether inogona kuvandudza kusimba kwekubatanidza kwedhaka, uye kana maviri akashandiswa pamwe chete, mhedzisiro yekuvandudza kusungirirwa kwesimba redhaka kunonyanya kukosha. Paunenge uchibatanidza cellulose ether uye starch ether, zvinodikanwa kuve nechokwadi kuti huwandu hwekubatanidza hwakakodzera. Yakanyanya kuwanda haingoparadzi zvinhu, asiwo inoderedza kusimba kwechisungo chedhaka.

(4) Cellulose ether uye starch ether, sezvinowanzo shandiswa dhaka admixtures, inogona kushandura zvakanyanya hunhu hwedhaka, kunyanya mukuvandudza kusimba kwedhaka uye kusimba kwechisungo, uye kupa chirevo chekuenzanisa kugadzirwa kweakaoma-akasanganiswa plastering mortar admixtures.