Zotsatira za Cellulose Ether pa Mortar Properties

Zotsatira za mitundu iwiri ya ma cellulose ethers pakuchita matope adawerengedwa. Zotsatira zinasonyeza kuti mitundu yonse ya ma cellulose ethers ikhoza kupititsa patsogolo kwambiri kusunga madzi kwa matope ndi kuchepetsa kusasinthasintha kwa matope; Mphamvu yopondereza imachepetsedwa m'madigiri osiyanasiyana, koma chiŵerengero chopindika ndi mphamvu yomangirira ya matope imachulukitsidwa m'madigiri osiyanasiyana, motero kuwongolera kumanga matope.

Mawu ofunikira:cellulose ether; wosungira madzi; mwayi wolumikizana

Cellulose ether (MC)ndi yochokera ku zinthu zachilengedwe cellulose. Ma cellulose ether angagwiritsidwe ntchito ngati chosungira madzi, thickener, binder, dispersant, stabilizer, suspending agent, emulsifier ndi filimu kupanga thandizo, etc. matope, kotero cellulose ether ndiye polima wosungunuka m'madzi omwe amagwiritsidwa ntchito kwambiri mumatope.

1. Zida zoyesera ndi njira zoyesera

1.1 Zopangira

Simenti: Simenti wamba ya Portland yopangidwa ndi Jiaozuo Jianjian Cement Co., Ltd., yokhala ndi mphamvu ya 42.5. Mchenga: Nanyang yellow mchenga, fineness modulus 2.75, sing'anga mchenga. Cellulose ether (MC): C9101 yopangidwa ndi Beijing Luojian Company ndi HPMC yopangidwa ndi Shanghai Huiguang Company.

1.2 Njira yoyesera

Mu phunziro ili, chiŵerengero cha laimu-mchenga chinali 1: 2, ndipo chiŵerengero cha madzi-simenti chinali 0,45; ether ya cellulose inasakanizidwa ndi simenti poyamba, ndiyeno mchenga unawonjezeredwa ndikugwedezeka mofanana. Mlingo wa cellulose ether umawerengedwa molingana ndi kuchuluka kwa simenti.

Kuyesa kwamphamvu kwamphamvu komanso kusasinthika kumachitika molingana ndi JGJ 70-90 "Njira Zoyesera Zazinthu Zoyambira Zomanga Mutondo". Kuyesa kwamphamvu kwamphamvu kumachitika molingana ndi GB/T 17671-1999 "Cement Mortar Strength Test".

Kuyesa kusungitsa madzi kunachitika molingana ndi njira yosefera yomwe imagwiritsidwa ntchito m'mabizinesi opangira konkriti aku France. Njira yeniyeni ndi iyi: (1) ikani zigawo 5 za pepala lapang'onopang'ono la fyuluta pa mbale ya pulasitiki yozungulira, ndikulemera kwake; (2) ikani kukhudzana mwachindunji ndi matope Ikani mkulu-liwiro fyuluta pepala pa wosakwiya-liwiro fyuluta pepala, ndiyeno akanikizire yamphamvu ndi m'mimba mwake wa 56 mm ndi kutalika kwa 55 mm pa kusala fyuluta pepala; (3) Thirani matope mu silinda; (4) Pambuyo pa matope ndi kukhudzana kwa pepala la fyuluta kwa mphindi 15, yesaninso Ubwino wa pepala lapang'onopang'ono la fyuluta ndi chimbale cha pulasitiki; (5) Kuwerengera kuchuluka kwa madzi komwe kumatengedwa ndi pepala lapang'onopang'ono pa sikweya mita, komwe ndi kuchuluka kwa mayamwidwe amadzi; (6) Mayamwidwe amadzi ndi njira ya masamu ya zotsatira ziwiri za mayeso. Ngati kusiyana pakati pa mitengo yamtengo wapatali kupitirira 10%, kuyesako kuyenera kubwerezedwa; (7) Kusungidwa kwa madzi kwa matope kumawonetsedwa ndi kuchuluka kwa mayamwidwe amadzi.

Kuyesa kwamphamvu kwa ma bond kunachitika potengera njira yomwe bungwe la Japan Society for Materials Science linalimbikitsa, ndipo mphamvu ya ma bond inali yodziwika ndi mphamvu yosinthika. Mayesowa amatengera chitsanzo cha prism chomwe kukula kwake ndi 160mm×40 mm×40 mm. Zitsanzo zadothi wamba zomwe zidapangidwa pasadakhale zidachiritsidwa mpaka zaka 28 d, kenako ndikudula magawo awiri. Theka ziwiri za chitsanzo anapangidwa zitsanzo ndi matope wamba kapena polima matope, ndiyeno mwachibadwa anachiritsa m'nyumba kwa zaka zina, ndiyeno kuyesedwa malinga ndi mayeso njira flexural mphamvu ya simenti matope.

2. Zotsatira zoyesa ndi kusanthula

2.1 Kusasinthasintha

Kuchokera ku mphamvu ya cellulose ether pa kugwirizana kwa matope, zikhoza kuwoneka kuti ndi kuwonjezeka kwa zomwe zili mu cellulose ether, kugwirizana kwamatope kumawonetsa kutsika kwapansi, ndipo kuchepa kwa matope osakanikirana ndi HPMC kumathamanga mofulumira. kuposa matope osakanikirana ndi C9101. Izi ndichifukwa choti kukhuthala kwa cellulose ether kumalepheretsa kuyenda kwa matope, ndipo mamasukidwe a HPMC ndi apamwamba kuposa a C9101.

2.2 Kusunga madzi

Mumatope, zida za simenti monga simenti ndi gypsum zimafunika kuthiridwa ndi madzi kuti zikhazikike. Kuchuluka kwa cellulose ether kumatha kusunga chinyezi mumtondo kwa nthawi yayitali, kotero kuti kukhazikitsa ndi kuumitsa kupitirire.

Kuchokera ku zotsatira za cellulose ether zomwe zili pamadzi osungiramo matope, zikhoza kuwoneka kuti: (1) Ndi kuwonjezeka kwa C9101 kapena HPMC cellulose ether content, kuchuluka kwa mayamwidwe a matope kunachepa kwambiri, ndiko kuti, kusunga madzi matope adasinthidwa kwambiri, makamaka atasakanikirana ndi Mortar of HPMC. Kusungidwa kwake kwa madzi kumatha kukonzedwa bwino; (2) Pamene kuchuluka kwa HPMC ndi 0.05% mpaka 0.10%, matope amakwaniritsa zofunikira zosungira madzi pomanga.

Ma ether onse a cellulose ndi ma polima omwe si a ionic. Magulu a hydroxyl pa cellulose ether molecular chain ndi ma atomu a okosijeni pamagulu a ether amatha kupanga zomangira za haidrojeni ndi mamolekyu amadzi, kupanga madzi aulere kukhala madzi omangika, motero amagwira ntchito yabwino pakusunga madzi.

Kusungidwa kwamadzi kwa cellulose ether makamaka kumadalira mamasukidwe ake, kukula kwa tinthu, kuchuluka kwa kusungunuka ndi kuchuluka kwake. Nthawi zambiri, kuchuluka kwachulukidwe kowonjezera, kukwezeka kwa mamachulukidwe, komanso kuwongolera bwino, kumapangitsa kuti madzi asungidwe. Onse a C9101 ndi HPMC cellulose ether ali ndi magulu a methoxy ndi hydroxypropoxy mu unyolo wa maselo, koma zomwe zili mu methoxy mu HPMC cellulose ether ndizoposa za C9101, ndipo kukhuthala kwa HPMC ndikwapamwamba kuposa kwa C9101, kotero kusungidwa kwa madzi kwa matope. wosakanizidwa ndi HPMC ndi wapamwamba kuposa matope osakanikirana ndi matope akuluakulu a HPMC C9101. Komabe, ngati mamasukidwe akayendedwe ndi wachibale molekyulu kulemera kwa mapadi ether ndi okwera kwambiri, solubility ake adzachepa moyenerera, amene adzakhala ndi zotsatira zoipa pa mphamvu ndi workability wa matope. Mphamvu zamapangidwe kuti zikwaniritse zotsatira zabwino kwambiri zomangirira.

2.3 Mphamvu ya Flexural ndi mphamvu yopondereza

Kuchokera ku mphamvu ya cellulose ether pa mphamvu yosinthasintha ndi yopondereza ya matope, zikhoza kuwoneka kuti ndi kuwonjezeka kwa zomwe zili mu cellulose ether, mphamvu yowonongeka ndi yopondereza yamatope pa 7 ndi masiku 28 inasonyeza kutsika. Izi zili choncho makamaka chifukwa: (1) Pamene cellulose ether iwonjezeredwa kumatope, ma polima osinthika mu pores a matope amawonjezeka, ndipo ma polima osinthikawa sangathe kupereka chithandizo cholimba pamene matrix ophatikizana aphwanyidwa. Zotsatira zake, mphamvu yosinthasintha ndi yopondereza ya matope imachepetsedwa; (2) Ndi kuwonjezeka kwa zomwe zili mu cellulose ether, mphamvu yake yosungira madzi ikukhala bwino, kotero kuti pambuyo popanga chipika choyesa matope, porosity mu chipika choyesa matope chimawonjezeka, mphamvu yosinthika ndi yoponderezedwa idzachepetsedwa. ; (3) pamene matope osakaniza owuma amasakanikirana ndi madzi, tinthu tating'onoting'ono ta cellulose ether latex tinthu tating'onoting'ono timayamba kudsorbed pamwamba pa tinthu tating'onoting'ono ta simenti kuti tipange filimu ya latex, yomwe imachepetsa kusungunuka kwa simenti, motero kuchepetsa mphamvu ya simenti. matope.

2.4 Pindani chiŵerengero

Kusinthasintha kwa matope kumapangitsa kuti matopewo akhale opunduka bwino, zomwe zimapangitsa kuti zigwirizane ndi kupsinjika komwe kumachitika chifukwa cha kuchepa ndi kusinthika kwa gawo lapansi, motero kumapangitsa kuti matopewo akhale olimba komanso olimba.

Kuchokera ku mphamvu ya cellulose ether zomwe zili pamatope opindika chiŵerengero (ff / fo), zikhoza kuwoneka kuti ndi kuwonjezeka kwa cellulose etha C9101 ndi HPMC zomwe zili, kuchuluka kwa matope kumangosonyeza kuwonjezeka, kusonyeza kuti kusinthasintha kwa matope kunali bwino.

Pamene cellulose ether imasungunuka mumatope, chifukwa methoxyl ndi hydroxypropoxyl pa unyolo wa maselo adzachita ndi Ca2 + ndi Al3 + mu slurry, gel osakaniza amapangidwa ndikudzazidwa mumpata wamatope a simenti, motero Amagwira ntchito yodzaza kusinthasintha. ndi kulimbikitsana kosinthika, kuwongolera kuphatikizika kwa matope, ndipo zikuwonetsa kuti kusinthasintha kwa matope osinthidwa kumapangidwa bwino macroscopically.

2.5 Mphamvu ya bond

Kuchokera ku mphamvu ya cellulose ether pa mphamvu ya matope, zikhoza kuwoneka kuti mphamvu ya matope imawonjezeka ndi kuwonjezeka kwa cellulose ether.

Kuwonjezera pa cellulose ether akhoza kupanga wosanjikiza woonda wa madzi polima filimu pakati mapadi etere ndi hydrated simenti particles. Firimuyi imakhala ndi kusindikiza ndipo imapangitsa kuti "kuuma kwapamwamba" kwamatope. Chifukwa cha kusungidwa bwino kwa madzi a cellulose ether, madzi okwanira amasungidwa mkati mwa matope, potero kuonetsetsa kuti simentiyo imawumitsa simenti ndikukula kwathunthu kwa mphamvu zake, ndikuwongolera mphamvu ya mgwirizano wa phala la simenti. Kuphatikiza apo, kuwonjezera kwa cellulose ether kumathandizira kugwirizanitsa kwa matope, ndikupanga matope kukhala ndi pulasitiki yabwino komanso kusinthasintha, zomwe zimapangitsanso kuti matopewo athe kutengera kusinthika kwa gawo lapansi, potero kumapangitsa kuti matopewo akhale olimba. .

2.6 Kuchepa

Zitha kuwonedwa kuchokera ku zotsatira za cellulose ether zomwe zili pa shrinkage ya matope: (1) Mtengo wa shrinkage wa cellulose ether mortar ndi wotsika kwambiri kuposa wamatope opanda kanthu. (2) Ndi kuwonjezeka kwa zinthu za C9101, mtengo wa shrinkage wa matope unachepa pang'onopang'ono, koma pamene zomwe zafika pa 0.30%, mtengo wa shrinkage wa matope unawonjezeka. Izi zili choncho chifukwa kuchuluka kwa cellulose ether, kumapangitsanso kukhuthala kwake, komwe kumapangitsa kuchuluka kwa madzi. (3) Ndi kuwonjezeka kwa zinthu za HPMC, mtengo wa shrinkage wa matope unachepa pang'onopang'ono, koma pamene zomwe zinafika pa 0.20%, mtengo wa shrinkage wa matope unawonjezeka ndiyeno unachepa. Izi ndichifukwa choti kukhuthala kwa HPMC ndikokulirapo kuposa kwa C9101. Kukwezera kukhuthala kwa cellulose ether. Kusungirako bwino kwa madzi, kumakhala ndi mpweya wambiri, pamene mpweya ufika pamlingo wina, mtengo wa shrinkage wa matope udzawonjezeka. Choncho, potengera mtengo wa shrinkage, mlingo woyenera wa C9101 ndi 0.05% ~ 0.20%. Mlingo woyenera wa HPMC ndi 0.05% ~ 0.10%.

3. Mapeto

1. Ma cellulose ether amatha kupititsa patsogolo kusungirako madzi mumatope ndikuchepetsa kusasinthika kwamatope. Kusintha kuchuluka kwa cellulose ether kumatha kukwaniritsa zosowa za matope omwe amagwiritsidwa ntchito pama projekiti osiyanasiyana.

2. Kuwonjezera kwa cellulose ether kumachepetsa mphamvu ya flexural ndi compressive mphamvu ya matope, koma kumawonjezera chiŵerengero chopinda ndi kugwirizanitsa mphamvu pamlingo wina, potero kumapangitsa kuti matope azikhala olimba.

3. Kuphatikizika kwa cellulose ether kumatha kupititsa patsogolo ntchito ya shrinkage ya matope, ndipo pakuwonjezeka kwa zomwe zili mkati mwake, mtengo wa shrinkage wa matope umakhala wocheperako komanso wocheperako. Koma pamene kuchuluka kwa cellulose ether kufika pa mlingo winawake, shrinkage mtengo wa matope amawonjezeka pamlingo wakutiwakuti chifukwa cha kuchuluka kwa mpweya-entraining kuchuluka.