Mhedzisiro yeCellulose Ether pane Mortar Properties

Mhedzisiro yemhando mbiri dze cellulose ether pakuita kwedhaka dzakadzidzwa. Zvigumisiro zvakaratidza kuti marudzi ose e-cellulose ethers anogona kuvandudza zvakanyanya kuchengetwa kwemvura yedhaka uye kuderedza kuwirirana kwedhaka; Simba rekumanikidza rinoderedzwa mumadhigirii akasiyana, asi chiyero chekupeta uye simba rekubatanidza redhaka rinowedzerwa mumadhigirii akasiyana, nokudaro kuvandudza kuvakwa kwedhaka.

Mazwi akakosha:cellulose ether; mvura yekuchengetedza mumiririri; bonding simba

Cellulose ether (MC)inobva ku natural material cellulose. Cellulose ether inogona kushandiswa sechinhu chekuchengetedza mvura, thickener, binder, dispersant, stabilizer, suspending agent, emulsifier uye firimu-forming aid, etc. Nokuti cellulose ether ine mvura yakanaka yekuchengetedza uye kukora pamatope, inogona kuvandudza zvakanyanya kushanda. yedhaka, saka cellulose ether ndiyo inonyanya kushandiswa mumvura-soluble polymer mudhaka.

1. Zvishandiso zvekuedza uye nzira dzekuyedza

1.1 Raw zvinhu

Simende: Yakajairika Portland simende inogadzirwa neJiaozuo Jianjian Cement Co., Ltd., ine giredhi resimba re42.5. Jecha: Nanyang yero jecha, fineness modulus 2.75, yepakati jecha. Cellulose ether (MC): C9101 inogadzirwa neBeijing Luojian Company uye HPMC inogadzirwa neShanghai Huiguang Company.

1.2 Nzira yekuedza

Muchidzidzo ichi, chiyero che lime-jecha chaiva 1: 2, uye chiyero chemvura-samende chaiva 0.45; iyo cellulose ether yakasanganiswa nesamende kutanga, uye ipapo jecha raiwedzerwa uye rakanyandurwa zvakaenzana. Muyero we cellulose ether inotarwa zvichienderana nechikamu chesement mass.

Iyo yekumanikidza simba bvunzo uye kuenderana bvunzo inoitwa zvichireva nezveJGJ 70-90 "Eyedzo Nzira dzeBasic Properties yeKuvaka Mortar". Iyo flexural simba bvunzo inoitwa zvinoenderana neGB/T 17671-1999 "Cement Mortar Strength Test".

Muedzo wekuchengetedza mvura wakaitwa zvinoenderana nenzira yekusefa bepa rinoshandiswa muFrench aerated kongiri mabhizinesi ekugadzira. Iyo chaiyo maitiro ndeaya anotevera: (1) isa 5 akaturikidzana eanononoka sefa bepa pane yepurasitiki denderedzwa ndiro, uye kuyera huwandu hwayo; (2) isa imwe yakanangana nedhaka Isa pepa resefa yepamusoro-soro papepa rinononoka-speed sefa, uye wobva wadzvanya cylinder ine dhayamita yemukati ye56 mm uye kureba kwe55 mm papepa rinokurumidza sefa; (3) Dururira dhaka muhumburumbira; (4) Mushure medhaka uye pepa rekusefa rinosangana kwemaminetsi gumi nemashanu, yera zvakare Unhu hwepepa rinononoka refirita uye disc disc; (5) Verenga huwandu hwemvura inotorwa neinononoka sefa bepa paskweya mita nharaunda, inova mwero wekunyudzwa kwemvura; (6) Mwero wekunyudzwa kwemvura ndiyo nzira yemasvomhu yemhinduro mbiri dzebvunzo. Kana musiyano pakati pehuwandu hwehuwandu hunodarika 10%, muedzo unofanirwa kudzokororwa; (7) Kuchengetwa kwemvura kwedhaka kunoratidzwa nehuwandu hwekutora mvura.

Muedzo wesimba rezvisungo wakaitwa maererano nenzira yakakurudzirwa neJapan Society for Materials Science, uye kusimba kwechisungo kwairatidzwa nesimba rekushanduka-shanduka. Muedzo unotora prism sample ine saizi iri 160mm×40mm×40mm. Sample yedhaka yakajairwa yakagadzirwa kare yakarapwa kusvika pazera re28 d, ndokuzochekwa kuita hafu mbiri. Iwo mahafu maviri emuenzaniso akagadzirwa kuita masampuli neakajairwa dhaka kana polymer dhaka, uye obva arapwa mukati meimwe zera, uye ndokuyedzwa zvinoenderana neyeyedzo nzira yekushanduka kwesimba resimende dhaka.

2. Migumisiro yekuedza uye kuongorora

2.1 Kuenderana

Kubva pamhedzisiro ye cellulose ether pakuenderana kwedhaka, zvinogona kuoneka kuti nekuwedzera kwemukati we cellulose ether, kuenderana kwedhaka kunoratidza kuderera kwemaitiro, uye kuderera kwekuenderana kwedhaka rakasanganiswa neHPMC nekukurumidza. kupfuura iyo yedhaka yakasanganiswa neC9101. Izvi zvinodaro nekuti viscosity ye cellulose ether inotadzisa kuyerera kwedhaka, uye viscosity yeHPMC yakakwirira kupfuura yeC9101.

2.2 Kuchengeta mvura

Mudhaka, simende zvinhu zvakaita sesimende uye gypsum zvinoda kugadzikiswa nemvura kuti zvigadzike. Nhamba inonzwisisika ye cellulose ether inogona kuchengetedza mwando mudhaka kwenguva yakareba yakakwana, kuitira kuti kugadzirisa uye kuomesa maitiro kuenderera mberi.

Kubva pamigumisiro ye cellulose ether content pamusoro pekuchengetedza mvura kwedhaka, zvinogona kuonekwa kuti: (1) Nekuwedzera kweC9101 kana HPMC cellulose ether content, mvura yekunyura kwedhaka yakaderera zvakanyanya, kureva, kuchengetwa kwemvura. dhaka rakavandudzwa zvakanyanya, kunyanya kana rakasanganiswa neMota yeHPMC. Kuchengetedza kwayo mvura kunogona kuvandudzwa zvakanyanya; (2) Kana huwandu hweHPMC huri 0.05% kusvika 0.10%, dhaka rinosangana zvizere nezvinodiwa kuchengetedza mvura mukugadzira.

Ose ese cellulose ethers asiri-ionic polima. Mapoka ehydroxyl ari pa cellulose ether molecular chain uye maatomu eokisijeni pazvisungo zveether anogona kugadzira ma hydrogen bond nemamorekuru emvura, achiita kuti mvura yemahara ive mvura yakasungwa, nokudaro ichiita basa rakanaka mukuchengetedza mvura.

Kuchengetwa kwemvura kwe cellulose ether kunonyanya kuenderana neayo viscosity, particle size, dissolution rate uye kuwedzera huwandu. Kazhinji, iyo yakawanda yakawedzerwa, iyo yakakwira viscosity, uye iyo yakatsetseka yakatsetseka, iyo yakakwirira kuchengetwa kwemvura. Zvose C9101 uye HPMC cellulose ether dzine methoxy uye hydroxypropoxy mapoka mucheni ye molecular, asi zvinyorwa zve methoxy mu HPMC cellulose ether yakakwirira kudarika yeC9101, uye viscosity yeHPMC yakakwirira kudarika yeC9101, saka kuchengetwa kwemvura kwedhaka. yakasanganiswa neHPMC yakakwirira kudarika yedhaka yakasanganiswa neHPMC C9101 hombe yedhaka. Nekudaro, kana iyo viscosity uye yakaenzana molecular uremu hwe cellulose ether yakanyanya, solubility yayo inoderera zvinoenderana, izvo zvichave nemhedzisiro yakaipa pakusimba uye kushanda kwedhaka. Simba rechimiro kuti uwane yakanakisa bonding mhedzisiro.

2.3 Flexural simba uye kumanikidza simba

Kubva pamigumisiro ye cellulose ether pane flexural uye compressive simba redhaka, zvinogona kuonekwa kuti nekuwedzera kwezvinyorwa zve cellulose ether, flexural and compressive simba redhaka pa7 uye 28 mazuva akaratidza kuderera. Izvi zvinonyanya kuitika nekuti: (1) Kana cellulose ether yawedzerwa mudhaka, mapolymer anochinjika ari mumapores edhaka anowedzerwa, uye aya anochinjika mapolymers haagone kupa tsigiro yakasimba kana iyo composite matrix yakatsikirirwa. Nekuda kweizvozvo, iyo flexural uye inomanikidza simba redhaka inoderedzwa; (2) Nekuwedzera kwezviri mukati me cellulose ether, kuchengetedza kwayo mvura kuri kuita zviri nani uye zvirinani, zvekuti mushure mekunge dhaka rekuyedza bhuroka raumbwa, iyo porosity mumatope test block inowedzera, iyo flexural uye yekumanikidza simba inoderedzwa. ; (3) kana iyo yakaoma-yakavhenganiswa dhaka yakasanganiswa nemvura, iyo cellulose ether latex zvimedu zvinotanga kushambadzirwa pamusoro pemasimende sement kuti iite latex firimu, iyo inoderedza hydration ye simenti, nekudaro zvakare kuderedza simba re the dope.

2.4 Peta reshiyo

Iko kushanduka kwedhaka kunopa dhaka nekuremara kwakanaka, izvo zvinoita kuti zvigadzirise kushushikana kunokonzerwa ne shrinkage uye deformation ye substrate, nokudaro kuvandudza zvakanyanya kusimba kwechisungo uye kusimba kwedhaka.

Kubva pamhedzisiro ye cellulose ether yemukati pane dhaka kupeta ratio (ff / fo), zvinogona kuoneka kuti nekuwedzera kweselulosi ether C9101 uye HPMC zvemukati, iyo dhaka kupeta reshiyo yakaratidza kuwedzera maitiro, zvichiratidza kuti kuchinjika kwedhaka kwaive. kuvandudzwa.

Kana iyo cellulose ether inonyunguduka mudhaka, nekuti methoxyl uye hydroxypropoxyl pane molecular cheni ichaita neCa2 + uye Al3 + muslurry, gel viscous inoumbwa uye yakazadzwa mugedhi resimende, saka Inotamba basa rekuzadza. uye flexible reinforcement, kuvandudza compactness yedhaka, uye inoratidza kuti kushanduka kwevhu rakagadziridzwa kunovandudzwa macroscopically.

2.5 Bond simba

Kubva pane mhedzisiro ye cellulose ether yemukati pane iyo mortar bond simba, zvinogona kuoneka kuti dhaka bond simba rinowedzera nekuwedzera kwe cellulose ether content.

Kuwedzerwa kwe cellulose ether kunogona kuumba chidimbu chitete chepolymer firimu pakati pe cellulose ether uye hydrated simende zvidimbu. Iyi firimu ine chisimbiso chekuita uye inovandudza "pamusoro pevhu yakaoma" chiitiko chedhaka. Pamusana pekuchengetwa kwemvura yakanaka ye cellulose ether, mvura yakakwana inochengetwa mukati medhaka, zvichiita kuti kuve nechokwadi chekuoma kwe hydration ye simenti uye kukura kwakakwana kwesimba rayo, nekuvandudza kusimba kwechisungo chesimenti paste. Mukuwedzera, kuwedzerwa kwe cellulose ether kunovandudza kubatanidzwa kwedhaka, uye kunoita kuti dhaka rive nepurasitiki yakanaka uye kushanduka, izvo zvinoitawo kuti dhaka rikwanise kuenderana ne shrinkage deformation ye substrate, nokudaro kuvandudza kusimba kwechisungo chedhaka. .

2.6 Kuderera

Zvinogona kuonekwa kubva mukuita kwe cellulose ether content pa shrinkage yedhaka: (1) The shrinkage value ye cellulose ether mortar yakaderera zvikuru pane iyo blank mortar. (2) Nekuwedzera kweC9101 zvinyorwa, shrinkage value yedhaka yakaderera zvishoma nezvishoma, asi apo zvinyorwa zvakasvika 0.30%, shrinkage value yedhaka yakawedzera. Izvi zvinodaro nekuti iyo yakakura kuwanda kwe cellulose ether, iyo yakakura viscosity yayo, iyo inokonzera kuwedzera kwekudiwa kwemvura. (3) Nekuwedzera kweiyo HPMC yemukati, iyo shrinkage kukosha kwedhaka yakadzikira zvishoma nezvishoma, asi kana zvirimo zvasvika 0.20%, iyo shrinkage kukosha kwedhaka yakawedzera ichibva yaderera. Izvi zvinodaro nekuti viscosity yeHPMC yakakura kupfuura iyo yeC9101. Iyo yakakwirira viscosity ye cellulose ether. Izvo zviri nani kuchengetedza mvura, kuwedzera kwemhepo, kana mhepo yemhepo inosvika kune imwe nhanho, iyo shrinkage kukosha kwedhaka ichawedzera. Nokudaro, maererano nekuderera kwekukosha, iyo yakakwana dosage yeC9101 ndeye 0.05% ~ 0.20%. The optimum dosage yeHPMC ndeye 0.05% ~ 0.10%.

3. Mhedziso

1. Cellulose ether inogona kuvandudza kuchengetwa kwemvura kwedhaka uye kuderedza kuwirirana kwedhaka. Kugadzirisa huwandu hwe cellulose ether inogona kusangana nezvinodiwa zvedhaka rinoshandiswa mumapurojekiti akasiyana.

2. Kuwedzerwa kwe cellulose ether kunoderedza simba rekugadzirisa uye kudzvinyirira simba redhaka, asi kunowedzera kupeta kwehuwandu uye simba rekubatanidza kune imwe nhanho, nokudaro kuvandudza kusimba kwedhaka.

3. Kuwedzerwa kwe cellulose ether kunogona kuvandudza shrinkage kushanda kwedhaka, uye nekuwedzera kwehuwandu hwayo, shrinkage inokosha yedhaka inova duku uye duku. Asi kana huwandu hwe cellulose ether hunosvika kune imwe nhanho, shrinkage kukosha kwedhaka kunowedzera kune imwe nhanho nekuda kwekuwedzera kwehuwandu hwemhepo-inopinza.