Cellulose Ether thiab Starch Ether ntawm Cov Khoom ntawm Qhuav-Mixed Mortar

Cov nyiaj ntawm cov cellulose sib txawv ether thiab hmoov txhuv nplej siab ether tau sib xyaw ua ke, muaj zog, compressive zog ntawm lub tshuaj khib tau kawm sim sim. Cov txiaj ntsig tau pom tias cellulose ether thiab hmoov txhuv nplej siab ether tuaj yeem txhim kho cov txheeb ze ntawm cov tshuaj khib nyiab, thiab thaum siv cov tshuaj kom raug, qhov kev ua tau zoo ntawm mortar yuav zoo dua.

Cov lus tseem ceeb: cellulose ether; hmoov nplej ether; qhuav-mixed mortar

Cov tshuaj mortar ib txwm muaj qhov tsis zoo ntawm qhov yooj yim los ntshav, tawg, thiab tsis muaj zog. Nws tsis yog ib qho yooj yim kom ua tau raws li qhov yuav tsum tau ua ntawm cov tuam tsev zoo, thiab nws yog ib qho yooj yim ua rau lub suab nrov thiab ib puag ncig muaj kuab paug thaum lub sij hawm tsim khoom. Nrog rau kev txhim kho ntawm tib neeg cov kev xav tau rau lub tsev zoo thiab ib puag ncig ecological, qhuav-siv mortar nrog kev ua haujlwm zoo dua tau siv ntau dua. Qhuav-mixed mortar, tseem hu ua qhuav-mixed mortar, yog ib qho khoom ua tiav uas yog sib xyaw nrog cov ntaub ntawv cementitious, nplua aggregates, thiab cov khoom siv hauv ib qho kev faib ua feem. Nws yog thauj mus rau qhov chaw tsim kho nyob rau hauv lub hnab los yog nyob rau hauv bulk rau tov nrog dej.

Cellulose ether thiab hmoov txhuv nplej siab ether yog ob qho tib si hauv tsev mortar admixtures. Cellulose ether yog lub hauv paus tsev qauv ntawm anhydroglucose tau los ntawm ntuj cellulose los ntawm etherification cov tshuaj tiv thaiv. Nws yog cov khoom siv dej-soluble polymer thiab feem ntau ua raws li cov roj nplua nyeem hauv mortar. Tsis tas li ntawd, nws tuaj yeem txo qhov sib xws ntawm cov tshuaj khib nyiab, txhim kho kev ua haujlwm ntawm cov mortar, ua kom cov dej tuav tus nqi ntawm cov mortar, thiab txo qhov kev tawg ntawm cov tshuaj khib nyiab. Starch ether yog cov hmoov txhuv nplej siab hloov pauv ether tsim los ntawm cov tshuaj tiv thaiv ntawm pawg hydroxyl hauv cov hmoov txhuv nplej siab nrog cov tshuaj nquag. Nws muaj peev xwm thickening zoo heev, thiab tsawg npaum li cas tuaj yeem ua tiav cov txiaj ntsig zoo. Nws feem ntau yog tov nrog cellulose hauv kev tsim mortar Siv nrog ether.

1. Kev sim

1.1 Cov khoom siv raw

Cement: Ishii P·O42.5R cement, tus qauv sib xws dej siv 26.6%.

Xuab zeb: nruab nrab xuab zeb, fineness modulus 2.7.

Cellulose ether: hydroxypropyl methylcellulose ether (HPMC), viscosity 90000MPa·s (2% aqueous tov, 20°C), muab los ntawm Shandong Yiteng Tshiab Khoom Co., Ltd.

Starch ether: hydroxypropyl starch ether (HPS), muab los ntawm Guangzhou Moke Building Materials Technology Co., Ltd.

Dej: dej siv.

1.2 Test method

Raws li cov txheej txheem tau teev tseg hauv "Cov Qauv rau Kev Ntsuas Cov Txheej Txheem Kev Ua Haujlwm ntawm Lub Tsev mortar" JGJ / T70 thiab "Technical Regulations for Plastering Mortar" JGJ / T220, kev npaj cov qauv thiab kev kuaj xyuas cov kev ua haujlwm tsis raug.

Hauv qhov kev sim no, kev siv dej ntawm qhov ntsuas qhov ntsuas DP-M15 yog txiav txim siab nrog qhov sib xws ntawm 98 hli, thiab qhov sib piv ntawm cov cement: xuab zeb: dej = 1: 4: 0.8. Qhov ntau npaum ntawm cellulose ether nyob rau hauv mortar yog 0-0.6%, thiab cov hmoov txhuv nplej siab ether yog 0-0.07%. Los ntawm kev hloov cov koob tshuaj ntawm cellulose ether thiab hmoov txhuv nplej siab ether, nws pom tau tias qhov kev hloov ntawm qhov ntau npaum li cas ntawm admixture muaj qhov cuam tshuam rau lub mortar. cuam ​​tshuam rau kev ua tau zoo. Cov ntsiab lus ntawm cellulose ether thiab starch ether yog xam raws li ib feem pua ​​ntawm cov cement loj.

2. Cov txiaj ntsig thiab kev tshuaj xyuas

2.1 Cov txiaj ntsig thiab kev tshuaj xyuas ntawm ib leeg-doped admixture

Raws li qhov sib piv ntawm cov phiaj xwm kev sim ua saum toj saud, kev sim ua kom zoo nkauj, muaj zog ntawm tib lub zog, compressive lub zog ntawm cov qhuav-mixed tov tau txais.

Kev soj ntsuam cov txiaj ntsig ntawm kev sib xyaw ua ke ib leeg, nws tuaj yeem pom tau tias thaum cov hmoov txhuv nplej siab ether sib xyaw ib leeg, qhov sib xws ntawm cov mortar txo qis tsis tu ncua piv nrog cov qauv ntawm cov hmoov txhuv nplej siab nrog rau qhov nce ntawm cov hmoov txhuv nplej siab ether, thiab qhov pom tseeb ntawm qhov ntom ntom. mortar yuav nce nrog qhov nce ntawm tus nqi. Tsawg dua, tab sis ib txwm ntau dua lub benchmark cap muaj zog, thiab ib txwm txo qis zog, thiab ib txwm muaj zog txo qis, nrog rau cov hmoov txhuv nplej siab nce ntxiv, tus daim ntawv cog lus lub zog ua ntej nce thiab tom qab ntawd txo qis, thiab ib txwm muaj ntau dua li tus nqi ntawm cov khoom pov thawj. Thaum cellulose ether tov nrog cellulose ether ib leeg, raws li tus nqi ntawm cellulose ether nce los ntawm 0 mus rau 0.6%, qhov sib xws ntawm mortar txo qis tsis tu ncua piv nrog cov tshuaj khib nyiab, tab sis nws tsis tsawg tshaj li 90 hli, uas ua kom muaj kev tsim kho zoo. mortar, thiab pom meej ntom muaj nyob rau tib lub sij hawm, lub zog compressive ntawm 3d thiab 28d yog qis dua li ntawm cov ntaub ntawv pov thawj, thiab nws txo qis tsis tu ncua nrog qhov nce ntawm ntau npaum li cas, thaum lub zog sib txuas tau zoo heev. Thaum cov koob tshuaj ntawm cellulose ether yog 0.4%, mortar bonding lub zog yog qhov loj tshaj plaws, yuav luag ob npaug ntawm qhov ntsuas qhov sib txuas ntawm lub zog.

2.2 Cov txiaj ntsig ntawm kev sib xyaw ua ke

Raws li kev tsim qauv sib piv nyob rau hauv admixtia piv, cov tshuaj khib nyiab thiab ntsuas ntom ntom, thiab lub zog compressive, compressive zog tau txais.

2.2.1 Kev cuam tshuam ntawm kev sib xyaw ua ke ntawm qhov sib xws ntawm mortar

Qhov sib npaug nkhaus yog tau raws li qhov kev ntsuam xyuas ntawm cov khoom sib xyaw ua ke. Nws tuaj yeem pom los ntawm qhov no tias thaum tus nqi ntawm cov cellulose ether yog 0.2% mus rau 0.6%, thiab cov hmoov txhuv nplej siab ether yog 0.03% mus rau 0.07%, ob qho tib si sib xyaw rau hauv mortar thaum kawg, thaum tswj tus nqi ntawm ib qho. ntawm cov admixtures, nce tus nqi ntawm lwm yam admixture yuav ua rau kom ib tug txo nyob rau hauv qhov sib xws ntawm mortar. Txij li cov cellulose ether thiab starch ether cov qauv muaj hydroxyl pawg thiab ether bonds, hydrogen atoms ntawm cov pab pawg no thiab cov dej dawb molecules nyob rau hauv cov sib tov tuaj yeem tsim hydrogen bonds, yog li ntawd cov dej ntau dua tshwm nyob rau hauv mortar thiab txo qhov ntws ntawm cov tshuaj khib nyiab. , ua rau tus nqi sib xws ntawm lub mortar maj mam txo.

2.2.2 Cov nyhuv ntawm compounding admixture ntawm qhov pom tseeb ntom ntawm mortar

Thaum cov cellulose ether thiab hmoov txhuv nplej siab ether sib xyaw rau hauv mortar ntawm ib qho kev noj, qhov pom tseeb ntawm cov tshuaj khib yuav hloov. Nws tuaj yeem pom los ntawm cov txiaj ntsig tau hais tias kev sib xyaw ntawm cellulose ether thiab hmoov txhuv nplej siab ether ntawm cov tshuaj tsim tawm Tom qab mortar, qhov pom tseeb qhov ntom ntawm cov mortar tseem nyob ntawm 1750kg / m.³, thaum pom meej qhov ntom ntawm cov tshuaj khib nyiab yog 2110kg / m³, thiab kev sib xyaw ua ke ntawm ob qho tib si rau hauv mortar ua kom pom tseeb qhov ceev poob li ntawm 17%. Nws tuaj yeem pom tau tias kev sib xyaw ntawm cellulose ether thiab hmoov txhuv nplej siab ether tuaj yeem txo qhov pom tseeb ntawm cov tshuaj khib nyiab thiab ua kom lub mortar sib zog. Qhov no yog vim cellulose ether thiab starch ether, raws li etherification khoom, yog admixtures nrog ib tug muaj zog huab cua-entraining nyhuv. Ntxiv ob qhov sib xyaw rau hauv mortar tuaj yeem txo qhov pom tseeb ntawm cov tshuaj khib nyiab.

2.2.3 Cov nyhuv ntawm kev sib xyaw ua ke ntawm lub zog compressive ntawm mortar

Lub 3d thiab 28d compressive zog nkhaus ntawm mortar yog tau los ntawm cov qhabnias ntawm lub mortar xeem. Lub zog compressive ntawm benchmark mortar 3d thiab 28d yog 15.4MPa thiab 22.0MPa, feem, thiab tom qab cov cellulose ether thiab starch ether sib tov rau hauv mortar, compressive zog ntawm mortar 3d thiab 28d yog 12.8MPa thiab 19.3MPa, ntsig txog. tsawg dua cov tsis muaj ob. Ib tug benchmark mortar nrog ib tug admixture. Los ntawm kev cuam tshuam ntawm kev sib xyaw ua ke ntawm lub zog compressive, nws tuaj yeem pom tias txawm tias lub sijhawm kho yog 3d lossis 28d, lub zog compressive ntawm mortar txo qis nrog qhov nce ntawm qhov sib xyaw ntawm cellulose ether thiab starch ether. Qhov no yog vim hais tias tom qab cov cellulose ether thiab starch ether sib tov, cov latex hais yuav tsim ib tug nyias txheej ntawm waterproof polymer nrog cov cement, uas cuam tshuam lub hydration ntawm cov cement thiab txo cov compressive zog ntawm lub mortar.

2.2.4 Kev cuam tshuam ntawm kev sib xyaw ua ke ntawm cov khoom sib xyaw ua ke ntawm cov tshuaj khib nyiab

Nws tuaj yeem pom los ntawm kev cuam tshuam ntawm cellulose ether thiab hmoov txhuv nplej siab ether ntawm lub zog nplaum ntawm mortar tom qab cov tshuaj tsim tau muab sib xyaw thiab sib xyaw rau hauv mortar. Thaum cov koob tshuaj ntawm cellulose ether yog 0.2% ~ 0.6%, qhov ntau npaum ntawm cov hmoov txhuv nplej siab ether yog 0.03% ~ 0.07% %, tom qab ob qho tib si sib xyaw rau hauv mortar, nrog kev nce ntawm cov nyiaj ntawm ob, lub zog ntawm kev sib koom ua ke mortar yuav maj mam nce ua ntej, thiab tom qab ncav cuag ib qho nqi, nrog rau qhov nce ntawm cov khoom sib xyaw, cov nplaum nplaum ntawm cov tshuaj khib yuav maj mam nce. Lub zog sib txuas yuav maj mam txo qis, tab sis nws tseem ntau dua tus nqi ntawm cov khoom siv sib xyaw ua ke ntawm lub zog. Thaum sib xyaw nrog 0.4% cellulose ether thiab 0.05% hmoov txhuv nplej siab ether, lub zog sib txuas ntawm cov tshuaj khib nyiab nce mus txog qhov siab tshaj plaws, uas yog kwv yees li 1.5 npaug siab dua li ntawm cov khoom pov thawj. Txawm li cas los xij, thaum qhov sib piv tau dhau lawm, tsis yog tsuas yog lub viscosity ntawm lub mortar loj heev, kev tsim kho yog qhov nyuaj, tab sis kuj tseem txo qis lub zog ntawm lub mortar.

3. Cov lus xaus

(1) Ob leeg cellulose ether thiab starch ether tuaj yeem txo qhov sib xws ntawm mortar, thiab cov nyhuv yuav zoo dua thaum ob qho tib si siv ua ke hauv qee qhov nyiaj.

⑵Vim tias cov khoom lag luam etherification muaj qhov ua tau zoo ntawm huab cua-entraining, tom qab ntxiv cellulose ether thiab starch ether, yuav muaj roj ntau nyob rau hauv lub mortar, yog li ntawd tom qab ntxiv cellulose ether thiab starch ether, qhov ntub dej ntawm lub mortar yuav pom meej ntom ntom. txo qis, uas yuav ua rau kom txo tau cov compressive zog ntawm lub mortar.

(3) Ib qho ntawm cov cellulose ether thiab hmoov txhuv nplej siab ether tuaj yeem txhim kho kev sib raug zoo ntawm mortar, thiab thaum ob qho tib si siv ua ke, cov txiaj ntsig ntawm kev txhim kho lub zog ntawm cov tshuaj khib nyiab yog qhov tseem ceeb dua. Thaum compounding cellulose ether thiab starch ether, nws yog ib qho tsim nyog los xyuas kom meej tias cov compounding yog tsim nyog. Cov nyiaj ntau dhau tsis tsuas yog siv cov ntaub ntawv pov tseg xwb, tab sis kuj txo cov kev sib txuas ntawm cov tshuaj khib nyiab.

(4) Cellulose ether thiab starch ether, raws li feem ntau siv mortar admixtures, tuaj yeem hloov pauv cov yam ntxwv ntawm cov mortar, tshwj xeeb tshaj yog nyob rau hauv kev txhim kho cov mortar sib xws thiab kev sib txuas ntawm lub zog, thiab muab kev siv rau kev faib ua feem ntawm qhuav-siv plastering mortar admixtures.