Nā Pono Mechanical o ka Cellulose Etera i hoʻololi ʻia no ka Moka Sima

Ua hoʻomākaukau ʻia ka pāpaʻi sima i hoʻololi ʻia me ka ratio wai-cement o 0.45, kahi ratio lime-sand o 1:2.5, a me cellulose ether me nā viscosities like ʻole o 0%, 0.2%, 0.4%, 0.6%, 0.8%, a me 1.0% i hoʻomākaukau ʻia. .Ma ke ana ʻana i nā ʻano mechanical o ka mortar sima a me ka nānā ʻana i ka microscopic morphology, ua aʻo ʻia ka hopena o ka HEMC ma ka ikaika compressive, ka ikaika flexural a me ka ikaika paʻa o ka mortar ciment i hoʻololi ʻia.Hōʻike nā hopena noiʻi: me ka piʻi ʻana o ka HEMC maʻiʻo, e emi mau ana ka ikaika compressive o ka mortar i hoʻololi ʻia i nā makahiki like ʻole, a e emi ana ka pae hoʻohaʻahaʻa a maʻalahi;ke hoʻohui ʻia ka ʻike like o ka cellulose ether, ʻO ka ikaika compressive o cellulose ether modified mortar me nā ʻano viscosities like ʻole: HEMC20HEMC10>HEMC5.

Hua'ōlelo nui:cellulose ether;paʻipaʻi sima;ikaika compressive;ikaika flexural;ikaika pili

1 Hoolauna

I kēia manawa, ʻoi aku ka nui o ka noi makahiki no ka mortar i ka honua ma mua o 200 miliona tons, a ke piʻi mau nei ka noi ʻoihana.I kēia manawa, ʻo ka mortar sima kuʻuna he mau hemahema e like me ke koko, delamination, ka maloʻo nui shrinkage, ʻilihune impermeability, haʻahaʻa haʻahaʻa tensile paʻa ikaika, a me ka hydration incomplete ma muli o ka poho wai, he mea paʻakikī ke hoʻoponopono ʻia, ʻaʻole wale ke kumu o nā hemahema o ke kūkulu ʻana, akā alakaʻi pū kekahi. i ka paʻakikī Phenomena e like me ka māhā o ka mortar, pulverization, shedding, and hollowing.

Ma keʻano he hoʻokahi o nā mea hoʻohui i hoʻohana pinepine ʻia no ka mortar pāʻoihana, aia nā cellulose ether i nā hana o ka mālama ʻana i ka wai, ka mānoanoa a me ka hoʻihoʻi ʻana, a hiki ke hoʻohana ʻia e hoʻomaikaʻi i nā waiwai kino o ka mortar sima e like me ka workability, ka paʻa ʻana o ka wai, ka hana hoʻopaʻa ʻana, a me ka manawa hoʻonohonoho. , e like me ka hoʻonui nui ʻana i ka sima.E hoʻemi ʻia ka ikaika paʻa o ka mortar, akā e hoʻemi ʻia ka ikaika compressive, ka ikaika flexural a me ka modulus elastic o ka mortar sima.Ua aʻo ʻo Zhang Yishun a me nā mea ʻē aʻe i ka hopena o ka methyl cellulose ether a me ka hydroxypropyl methyl cellulose ether ma nā waiwai o ka mortar.Ua hōʻike ʻia nā hopena: hiki i nā cellulose ethers ke hoʻomaikaʻi i ka paʻa ʻana o ka wai o ka mortar, a me ka ikaika flexural a me ka emi ʻana o ka ikaika compressive i nā degere like ʻole, ʻoiai ka piʻi ʻana o ka lākiō pelu a me ka ikaika paʻa o ka mortar e hoʻonui i nā degere like ʻole, a hiki i ka hana shrinkage o ka mīkini. e hoʻomaikaʻi ʻia.Ua hoʻohana ʻo AJenni, R.Zurbriggen, a me nā mea ʻē aʻe i ka hoʻāʻo ʻana a me nā ʻano loiloi hou e aʻo ai i ka pilina o nā mea like ʻole i loko o ka cellulose ether i hoʻololi ʻia i ka ʻōnaehana pipili lahilahi, a ʻike ʻia ua ʻike ʻia ka cellulose ether a me Ca(OH) kokoke i ka ʻili o ka mortar. .2, e hōʻike ana i ka neʻe ʻana o ka cellulose ethers i nā mea hana sima.

Ma kēia pepa, me ka hoʻohana ʻana i nā ʻano hoʻāʻo mortar e like me ke kūpaʻa compressive, flexural resistance, bonding, a me SEM microscopic hiʻohiʻona, ke aʻo ʻia ka mana o ka cellulose ether cement mortar ma nā waiwai mechanical e like me ka ikaika compressive, flexural resistance, a me ka ikaika paʻa i nā makahiki like ʻole. a ua hoakakaia.kona hana hana.

2. Nā mea maka a me nā ʻano hoʻāʻo

2.1 Mea maka

2.1.1 Sima

ʻO ka laurate cement maʻamau i hana ʻia e Wuhan Huaxin Cement Co., Ltd., model P 042.5 (GB175-2007), he 3.25g/cm³ a me kahi kiko kiko o 4200cm²/g.

2.1.2 Hydroxypropyl methylcellulose etera

ʻO kahydroxyethyl methyl cellulose etheri hana ʻia e ka Hercules Group o ʻAmelika Hui Pū ʻIa i nā viscosities o 50000MPa / s, 100000MPa / s, a me 200000MPa / s i 2% solution ma 25°C, a ʻo kēia mau pōkole ʻo HEMC5, HEMC10, a me HEMC20.

2.2 Hana ho'āʻo

a.Ka ikaika compressive o ka mortar i hoʻololi ʻia

Ua ho'āʻoʻia ka ikaika compressive o nā'ōmaʻomaʻo kino'ōmaʻomaʻo me ka mīkini ikaika ikaika TYE-300 mai Wuxi Jianyi Instrument Co., Ltd. ʻO ka hoʻoukaʻana he 0.5 kN / s.Hana ʻia ka hoʻāʻo ikaika compressive e like me GB / T17671-1999 "Cement Mortar Strength Test Method (ISO Method)".

Ma ka wehewehe ʻana, ʻo ke kumu no ka helu ʻana i ka ikaika compressive o ke kino ʻōmaʻomaʻo:

Rc=F/S

Ma kahi o Rc—ikaika compressive, MPa;

F—ka haawe hāʻule e hana ana i ka specimen, kN;

S—wahi kaomi, m².

Ma ka wehewehe ʻana, ʻo ke kumu no ka helu ʻana i ka ikaika flexural o ke kino ʻōmaʻomaʻo:

Rf= (3P× L)/(2b× h²) =0.234×P

Ma ka papa kuhikuhi, Rf—ikaika flexural, MPa;

P—ka haawe hāʻule e hana ana i ka specimen, kN;

L—ka mamao ma waena o nā kikowaena o nā cylinders kākoʻo, ʻo ia hoʻi, 10cm;

b, h—ka laulā a me ke kiʻekiʻe o ka ʻāpana keʻa o ke kino hoʻāʻo, ʻo ia mau mea ʻelua he 4cm.

b.ʻO ka ikaika paʻa paʻa o ka mortar sima i hoʻololi ʻia

E hoʻohana i ka ZQS6-2000 Adhesive Brick Adhesive Strength Detector e ana i ka ikaika pipili, a ʻo ka wikiwiki tensile he 2mm/min.Ua hoʻokō ʻia ka hoʻāʻo ikaika hoʻopaʻa ʻana e like me JC/T985-2005 "Cement-based self-leveling mortar for ground".

Ma ka wehewehe ʻana, ʻo ke kumu no ka helu ʻana i ka ikaika paʻa o ke kino ʻōmaʻomaʻo:

P=F/S

I loko o ka papa kuhikuhi, P—tensile bond strength, MPa;

F—haawe hāʻule nui loa, N;

S—wahi pili, mm².

3. Nā hopena a me ke kūkākūkā

3.1 Ka ikaika compressive

Mai ka ikaika compressive o nā ʻano ʻelua o ka cellulose ether mortars i hoʻololi ʻia me nā viscosities ʻokoʻa i nā makahiki like ʻole, hiki ke ʻike ʻia me ka hoʻonui ʻana o ka ʻike HEMC, ua emi ka ikaika compressive o cellulose ether modified mortars i nā makahiki like ʻole (3d, 7d a me 28d). nui loa.Hoʻemi nui ʻia a hoʻopaʻa mālie ʻia: i ka emi ʻana o ka maʻiʻo o HEMC ma mua o 0.4%, ua emi nui ka ikaika compressive i ka hoʻohālikelike ʻia me ka hāpana hakahaka;i ka manawa he 0.4% ~ 1.0% ka helu o ka HEMC, ua lohi ke ʻano o ka emi ʻana o ka ikaika compressive.Ke ʻoi aku ka nui o ka maʻiʻo cellulose ether ma mua o 0.8%, ʻoi aku ka haʻahaʻa o ka ikaika compressive o ka makahiki 7d a me 28d ma mua o ka hāpana hakahaka i ka makahiki 3d, ʻoiai ʻo ka ikaika compressive o ka mortar 3d i hoʻololi ʻia he aneane ʻole, a ʻo ka hāpana. kaomi māmā E ʻoki koke ʻia, he pauda ka loko, a haʻahaʻa loa ka mānoanoa.

ʻO ka hopena o ka HEMC hoʻokahi i ka ikaika compressive o ka mortar i hoʻololiʻia i nā makahiki likeʻole heʻokoʻa hoʻi, e hōʻike ana i ka emiʻana o ka ikaika compressive o 28d me ka piʻiʻana o ka HEMC ma mua o ka 7d a me ka 3d.Hōʻike kēia i ka hopena o ka HEMC i nā manawa a pau me ka piʻi ʻana o ka makahiki, a ʻaʻole i hoʻopilikia ʻia ka hopena o ka HEMC e ka emi ʻana o ka wai i loko o ka ʻōnaehana a i ʻole ka holomua o ka hopena hydration, e hopena i ka ulu ʻana o ka ikaika compressive. ʻoi aku ka liʻiliʻi o ka moka i hoʻololi ʻia ma mua o kēlā me ka ʻole o nā laʻana moka i hui pū ʻia me HEMC.

Mai ka pihi hoʻololi o ka ikaika compressive o cellulose ether i hoʻololi ʻia i ka mortar i nā makahiki like ʻole, hiki ke ʻike ʻia i ka wā i hoʻohui ʻia ai ka nui o ka cellulose ether, ʻo ka ikaika compressive o ka cellulose ether i hoʻololi ʻia i ka mortar me nā viscosities like ʻole: HEMC20HEMC10>HEMC5.ʻO kēia ke kumu no ka HEMC me kahi kiʻekiʻe o ka polymerization i ʻoi aku ka hopena i ka hoʻemi ʻana i ka ikaika compressive o ka mortar ma mua o ka HEMC me kahi haʻahaʻa o ka polymerization, akā ʻoi aku ka haʻahaʻa o ka ikaika compressive o ka mortar i hoʻololi ʻia i hui pū ʻia me HEMC puna paʻa ʻole me ka HEMC.

ʻO kēia mau mea ʻekolu e alakaʻi i ka emi ʻana o ka ikaika compressive o ka mortar i hoʻololi ʻia: ma ka ʻaoʻao hoʻokahi, no ka mea, ʻo ka wai-soluble HEMC macromolecular network structure e uhi ana i nā mea sima, CSH gel, calcium oxide, calcium aluminate hydrate a me nā mea ʻē aʻe a me ka wai ʻole. nā mea ʻāpana Ma luna o ka ʻili, ʻoi aku ka nui o ka hoʻomaka ʻana o ka hydration sima, ʻo ka adsorption ma waena o ka calcium aluminate hydrate a me HEMC e hoʻolohi i ka hopena hydration o ka calcium aluminate, ka hopena i ka emi nui o ka ikaika compressive.ʻIke ʻia ka hopena hoʻopaneʻe o ka mortar mau loa, e hōʻike ana i ka hiki ʻana o ka maʻiʻo o HEMC20 i ka 0.8% ~ 1%, ʻo ka 3d ikaika o ka mortar i hoʻololi ʻia he zero;ma ka lima 'ē aʻe, i ka hydrated HEMC hoʻonā i ka viscosity kiʻekiʻe, a me ka I ka wā o ka hui 'ana o ka mortar, hiki ke hui me ka ea e hana i ka nui helu o ka ea bubbles, ka hopena i ka nui helu o voids i loko o ka paʻakiki. , a e emi mau ana ka ikaika compressive o ka hāpana me ka hoʻonui o ka HEMC maʻiʻo a me ka piʻi ʻana o kona degere polymerization;Hoʻonui wale ka ʻōnaehana mortar i ka maʻalahi o ka mortar a ʻaʻole hiki ke pāʻani i ke ʻano o ke kākoʻo paʻa, no laila ua hoʻemi ʻia ka ikaika compressive.

3.2 Ka ikaika wiliwili

Mai ka ikaika flexural o elua okoa viscosity cellulose etera mortars hoʻololi 'ia i nā makahiki like 'ole, hiki ke 'ike 'ia e like me ka ho'ololi 'ana i ka ikaika compressive o ka mortar ho'ololi 'ia, ka flexural ikaika o cellulose ether ho'ololi mortar i ho'ololi 'ia me ka pi'i 'ana o ka HEMC ma'i'o.

Mai ka pihi hoʻololi o ka ikaika flexural o cellulose etera hoʻololi mortar i nā makahiki like ʻole, hiki ke ʻike ʻia i ka wā e like ai ka maʻiʻo o ka cellulose ether, ʻoi aku ka haʻahaʻa o ka ikaika flexural o HEMC20 mortar hoʻololi ʻia ma mua o ka HEMC10 hoʻololi mortar sample. ʻOiai ʻo ka maʻiʻo o HEMC he 0.4% ~ 0.8%, ʻo ka 28d flexural ikaika hoʻololi i nā pihi o nā mea ʻelua kokoke i coincide.

Mai ka pihi hoʻololi o ka ikaika flexural o cellulose ether mortar hoʻololi ʻia i nā makahiki like ʻole, hiki ke ʻike ʻia ʻo ka hoʻololi ʻana i ka ikaika flexural o ka mortar hoʻololi: HEMC5

3.3 Ka ikaika pili

Hiki ke ʻike ʻia mai nā ʻāpana ʻokoʻa o ka ikaika paʻa o nā mortar cellulose ether ʻekolu i hoʻololi ʻia i nā makahiki like ʻole e piʻi aʻe ka ikaika paʻa o ka mortar i hoʻololi ʻia me ka hoʻonui ʻana o ka HEMC maʻiʻo a me ke ʻano paʻa.Me ka hoʻonui ʻana o ka makahiki, ua hōʻike pū ka ikaika paʻa o ka mortar i hoʻololi ʻia.

Hiki ke ʻike ʻia mai ka 28-lā hoʻololi i ka ikaika o ka hoʻololi ʻana o nā mortar cellulose etera i hoʻololi ʻia e hoʻonui ʻia ka ikaika paʻa o ka mortar i hoʻololi ʻia me ka hoʻonui ʻana o ka HEMC maʻiʻo, a me ka lohi i ka paʻa.I ka manawa like, me ka piʻi ʻana o ke degere o ka polymerization o cellulose ether, ʻo ka hoʻololi ʻana o ka ikaika paʻa o ka mortar i hoʻololi ʻia: HEMC20> HEMC10> HEMC5.

ʻO kēia ma muli o ka hoʻokomo ʻana o ka nui o nā pores i loko o ka mortar i hoʻololi ʻia me ka ʻike HEMC kiʻekiʻe, ka hopena i ka piʻi ʻana o ka porosity o ke kino paʻakikī, ka emi ʻana o ka density o ka hale, a me ka ulu mālie o ka ikaika paʻa. ;i ka ho'āʻo tensile, ua loaʻa ka haʻihaʻi i loko o ka mortar i hoʻololi ʻia. moka i hoʻololi ʻia.Eia naʻe, i ka wā o ka nui o ka HEMC he haʻahaʻa (0% ~ 0.4%), hiki i ka wai-soluble HEMC molekele hiki ke uhi a hoʻopaʻa ʻia ma luna o nā ʻāpana sima hydrated, a hana i kahi kiʻi polymer ma waena o nā ʻāpana sima, e hoʻonui ai i ka loli a me ka maʻalahi. ka moka i hoololiia.Plasticity, a ma muli o ka maikaʻi o ka wai paʻa o HEMC, ua lawa ka wai o ka mortar i hoʻololi ʻia no ka hydration reaction, e hōʻoiaʻiʻo ana i ka hoʻomohala ʻana o ka ikaika sima, a me ka ikaika paʻa o ka mortar i hoʻololi ʻia e hoʻonui linearly.

3.4 SEM

Mai nā kiʻi hoʻohālikelike SEM ma mua a ma hope o ka cellulose ether modified mortar, hiki ke ʻike ʻia he ʻano nui nā āpau ma waena o nā kīʻaha aniani i loko o ka mortar i hoʻololi ʻole ʻia, a ua hana ʻia kahi liʻiliʻi o nā kristal.I loko o ka mortar i hoʻololiʻia, ulu nui nā kristal,ʻo ka hoʻokomoʻiaʻana o ka cellulose ether e hoʻomaikaʻi i ka hana paʻaʻana o ka wai o ka mortar, ua hoʻopiha pihaʻia ka sima, a uaʻikeʻia nā huahana hydration.

ʻO kēia no ka mea ua mālama ʻia ka cellulose ether me kahi kaʻina hana etherification kūikawā, nona ka hoʻopuehu maikaʻi a me ka paʻa wai.Hoʻokuʻu mālie ʻia ka wai no ka manawa lōʻihi, he liʻiliʻi wale nō ka wai i pakele mai nā pores capillary ma muli o ka maloʻo ʻana a me ka hoʻoheheʻe ʻana, a ʻo ka hapa nui o ka wai hydrates me ka sima e hōʻoia i ka ikaika o ka mortar ciment i hoʻololi ʻia.

4 Ka hopena

a.Ke piʻi aʻe nei ka maʻiʻo o ka HEMC, e emi mau ana ka ikaika compressive o ka mortar i hoʻololi ʻia i nā makahiki like ʻole, a ke emi nei ka laulā o ka hoʻohaʻahaʻa ʻana a me ka palahalaha;ke ʻoi aku ka nui o ka cellulose ether ma mua o 0.8%, ʻo ka 7d a me ka 28d ʻO ka ikaika compressive o ka 3d-aged blank sample he haʻahaʻa ma mua o ko ka hāpana hakahaka, aʻo ka ikaika compressive 3d-aged o ka mortar i hoʻololi ʻia ua aneane ʻole.Haʻi ka hāpana i ka wā e kaomi māmā ʻia, a ʻo loko he pauda me ka haʻahaʻa haʻahaʻa.

b.Ke hoʻohui ʻia ka nui like o ka cellulose ether, hoʻololi ka ikaika compressive o cellulose ether i hoʻololi ʻia i ka mortar me nā viscosities like ʻole: HEMC20HEMC10>HEMC5.

c.ʻO ka ikaika flexural o cellulose ether mortar hoʻololi ʻia e emi mālie me ka hoʻonui ʻana o ka ʻike HEMC.ʻO ka hoʻololi o ka ikaika flexural o ka mortar hoʻololi ʻia ʻo: HEMC5

d.Hoʻonui ka ikaika paʻa o ka mortar i hoʻololi ʻia me ka piʻi ʻana o ka maʻiʻo HEMC, a paʻa mālie.I ka manawa like, me ka piʻi ʻana o ke degere o ka polymerization o cellulose ether, ʻo ka hoʻololi ʻana o ka ikaika paʻa o ka mortar i hoʻololi ʻia: HEMC20> HEMC10> HEMC5.

e.Ma hope o ka hui ʻana o ka cellulose ether i loko o ka mortar sima, ulu nui ka aniani, ua hoʻemi ʻia nā pores ma waena o nā kīʻaha aniani, a ua hoʻopiha piha ʻia ka sima, e hōʻoiaʻiʻo ana i ka ikaika compressive, flexural a me ka hoʻopaʻa ʻana o ka mortar sima.