Methyl cellulose ether ma ka lumi wela e ho'ōla ana i ka ʻuala kiʻekiʻe

Puhi: Ma ka hoʻololi ʻana i ka ʻike o ka hydroxypropyl methylcellulose ether (HPMC) i ka hoʻomaʻamaʻa ʻana i ka wela maʻamau i ka ultra-high performance concrete (UHPC), ua aʻo ʻia ka hopena o ka cellulose ether i ka wai, ka manawa hoʻonohonoho, ka ikaika compressive, a me ka ikaika flexural o UHPC. , ka ikaika tensile axial a me ka waiwai tensile hope loa, a ua kālailai ʻia nā hopena. Hōʻike nā hopena hoʻāʻo: ʻaʻole i ʻoi aku ka nui o ka 1.00% o ka HPMC haʻahaʻa haʻahaʻa i ka wai o UHPC, akā e hōʻemi i ka nalowale o ka wai i ka manawa. , a hoʻolōʻihi i ka manawa hoʻonohonoho, hoʻomaikaʻi nui i ka hana hana; ke emi ka mea ma lalo o 0.50%, ʻaʻole koʻikoʻi ka hopena i ka ikaika compressive, ka ikaika flexural a me ka ikaika tensile axial, a i ka manawa i ʻoi aku ka nui o ka ʻike ma mua o 0.50%, ʻo kona mechanical Ua hoʻemi ʻia ka hana ma mua o 1/3. Ke noʻonoʻo nei i nā ʻano hana like ʻole, ʻo 0.50%.

Hua'ōlelo nui: hana kiʻekiʻe kiʻekiʻe; cellulose ether; ho'ōla wela maʻamau; ikaika compressive; ikaika flexural; ikaika tensile

0、Olelo mua

Me ka hoʻomohala wikiwiki ʻana o ka ʻoihana kūkulu hale o Kina, ua hoʻonui ʻia nā koi no ka hana ʻenehana i ka ʻenekinia maoli, a ua hana ʻia ka ultra-high performance concrete (UHPC) i pane i ka koi. ʻO ka hapa maikaʻi loa o nā ʻāpana me nā ʻāpana like ʻole i hoʻolālā ʻia, a hui pū ʻia me ka fiber kila a me ka mea hoʻohaʻahaʻa wai kiʻekiʻe, loaʻa iā ia nā waiwai maikaʻi loa e like me ka ultra-high compressive ikaika, kiʻekiʻe paʻakikī, kiʻekiʻe haʻalulu kūpaʻa lōʻihi a me ka ikaika ho'ōla pilikino. hiki o micro-cracks. Hana. ʻO ka noiʻi ʻenehana ʻē aʻe ma UHPC ua ʻano makua a ua hoʻohana ʻia i nā papahana hana he nui. Ke hoʻohālikelike ʻia me nā ʻāina ʻē, ʻaʻole hohonu ka noiʻi kūloko. Ua aʻo ʻo Dong Jianmiao a me nā mea ʻē aʻe i ka hoʻohui ʻana i ka fiber ma o ka hoʻohui ʻana i nā ʻano like ʻole a me ka nui o nā fiber. ʻO ka mana a me ke kānāwai o ke kaʻa; ʻO Chen Jing et al. ua aʻo i ka mana o ke anawaena fiber kila ma ka hana o UHPC ma ke koho ʻana i nā kaula kila me 4 anawaena. He liʻiliʻi wale nō nā noi ʻenekinia o UHPC ma Kina, a aia nō ia ma ke kahua o ka noiʻi theoretical. Ua lilo ka hana o ka UHPC Superiority i kekahi o nā kuhikuhi noiʻi o ka hoʻomohala ʻana i ka paʻa, akā he nui nā pilikia e hoʻoponopono ʻia. E like me nā koi kiʻekiʻe no nā mea maka, ke kumukūʻai kiʻekiʻe, ke kaʻina hana hoʻomākaukau paʻakikī, a me nā mea ʻē aʻe, kaohi ʻana i ka hoʻomohala ʻana o ka ʻenehana hana UHPC. Ma waena o lākou, me ka hoʻohana ʻana i ka mahu kiʻekiʻe ʻO ka hoʻōla ʻana o ka UHPC ma ke kiʻekiʻe wela hiki ke loaʻa iā ia nā waiwai mechanical kiʻekiʻe a me ka lōʻihi. Eia nō naʻe, ma muli o ke kaʻina hana hoʻōla mahu a me nā koi kiʻekiʻe no nā lako hana, hiki ke kaupalena ʻia ka noi ʻana o nā mea i nā pā hana mua, a ʻaʻole hiki ke hoʻokō ʻia ke kūkulu ʻia ʻana ma kahi. No laila, ʻaʻole kūpono ke hoʻohana ʻana i ke ʻano o ka hoʻōla wela ma nā papahana maoli, a pono e hana i ka noiʻi hohonu e pili ana i ka mālama ʻana i ka wela maʻamau i ka UHPC.

ʻO ka mālama ʻana i ka mahana maʻamau ʻo UHPC aia i ka pae noiʻi ma Kina, a ʻo kona wai-a-binder ratio he haʻahaʻa loa, a hiki ke hoʻomaloʻo wikiwiki ʻia ma ka ʻili i ka wā o ke kūkulu ʻana ma ka pūnaewele. I mea e hoʻomaikaʻi maikaʻi ai i ke ʻano dehydration, hoʻohui pinepine ʻia nā mea hana sima i kekahi mau mānoanoa mālama wai i ka mea. ʻO ka mea hana kemika e pale i ka hoʻokaʻawale ʻana a me ke kahe ʻana o nā mea, hoʻonui i ka paʻa ʻana o ka wai a me ka cohesion, hoʻomaikaʻi i ka hana kūkulu ʻana, a hoʻomaikaʻi maikaʻi hoʻi i nā waiwai mechanical o nā mea i hoʻokumu ʻia i ka sima. Hydroxypropyl methyl cellulose ether (HPMC) e like me ka polymer Thickener, ka mea hiki ke puunaue pono i ka polimer gelled slurry a me na mea i loko o ka sima-ma muli mea pono, a me ka wai noa i loko o ka slurry e lilo i ka wai paa, no laila,ʻaʻole maʻalahi ke nalowale mai. ka slurry a me ka hoʻomaikaʻi ʻana i ka hana paʻa ʻana o ka wai o ke koneki .I mea e hōʻemi ai i ka hopena o ka cellulose ether i ka wai o UHPC, ua koho ʻia ka haʻahaʻa haʻahaʻa cellulose ether no ka hoʻāʻo.

I ka hōʻuluʻulu ʻana, i mea e hoʻomaikaʻi ai i ka hana hana ma ke kumu o ka hōʻoia ʻana i nā waiwai mechanical o ka mālama ʻana i ka wela maʻamau UHPC, ke aʻo nei kēia pepa i ka hopena o ka haʻahaʻa haʻahaʻa cellulose ether ma luna o ka mālama wela maʻamau e pili ana i nā waiwai kemika o cellulose ether. a me kāna hana i loko o ka UHPC slurry. ʻO ka mana o ka wai, ka manawa coagulation, ka ikaika compressive, ka ikaika flexural, ka ikaika tensile axial a me ka waiwai tensile hope o UHPC e hoʻoholo ai i ke ʻano kūpono o ka cellulose ether.

1. Papa hoao

1.1 E ho'āʻo i nā mea maka a me ka ratio hui

ʻO nā mea maka no kēia ho'āʻo:

1) Sima: P·ʻO 52.5 kima Portland maʻamau i hana ʻia ma Liuzhou.

2) Lehu lele: Lehu lele i hana ʻia ma Liuzhou.

3) Slag pauka: S95 granulated blast blast slag pauka i hana ʻia ma Liuzhou.

4) Fume silica: fume silica semi-encrypted, pauka hina, ʻike SiO2≥92%, ili kiko kiko 23 m²/g.

5) Ke one quartz: 20 ~ 40 mesh (0.833 ~ 0.350 mm).

6) Mea hoʻoemi wai: polycarboxylate wai hoʻemi, pauka keʻokeʻo, hoʻohaʻahaʻa wai≥30%.

7) Latex pauka: redispersible latex pauka.

8) Fiber ether: hydroxypropyl methylcellulose METHOCEL i hana ʻia ma ʻAmelika Hui Pū ʻIa, viscosity 400 MPa s.

9) Pili kila: pololei copper-plated microwire steel fiber, anawaenaφ ʻO 0.22 mm ka lōʻihi he 13 mm, ʻo ka ikaika tensile he 2000 MPa..

Ma hope o ka nui o ka noiʻi hoʻokolohua i ka wā mua, hiki ke hoʻoholo ʻia ʻo ka lākiō huila kumu o ka mālama ʻana i ka mahana maʻamau ʻo ka sima: lele lehu: ka pauka mineral: silica fume: ke one: ka mea hoʻemi wai: ka pauka latex: wai = 860: 42: 83: 110:980:11:2:210, ʻo 2%. E hoʻohui i 0, 0.25%, 0.50%, 0.75%, 1.00% HPMC o cellulose ether (HPMC) maʻiʻo ma kēia lākiō hui kumu E hoʻonohonoho i nā hoʻokolohua hoʻohālikelike.

1.2 Hana ho'āʻo

E kaupaona i ka pauda maloʻo maka e like me ka lakene hui ʻana a waiho i loko o ka HJW-60 one-horizontal shaft forced concrete mixer. E hoʻomaka i ka hui ʻana a hiki i ka ʻaʻahu, e hoʻohui i ka wai a hui ʻia no 3 mau minuke, e hoʻopau i ka mixer, e hoʻohui i ke kaula kila i kaupaona ʻia a hoʻomaka hou i ka mixer no 2 mau minuke. Hana ʻia i loko o ka UHPC slurry.

ʻO nā mea hōʻike e pili ana i ka fluidity, ka manawa hoʻonohonoho, ka ikaika compressive, ka ikaika flexural, ka ikaika tensile axial a me ka waiwai tensile hope loa. Hoʻoholo ʻia ka hoʻāʻo fluidity e like me JC/T986-2018 "Cement-based Grouting Materials". ʻO ka hōʻike manawa hoʻonohonoho e like me GB /T 1346—2011 "Cement Standard Consistency Water Consumption and Setting Time Test Method". Hoʻoholo ʻia ka hōʻike ikaika flexural e like me GB/T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". ʻO ka hoʻāʻo ikaika compressive, axial tensile ikaika a ʻO ka hoʻāʻo waiwai tensile hope loa i hoʻoholo ʻia e like me DLT5150-2001 "Hydraulic Concrete Test Regulations".

2. Nā hopena hoʻāʻo

2.1 Waiwai

Hōʻike nā hopena hoʻāʻo fluidity i ka mana o ka ʻike HPMC i ka nalowale o ka fluidity UHPC i ka manawa. Ua ʻike ʻia mai ka hanana hoʻāʻo ʻana ma hope o ka hoʻoulu ʻia ʻana o ka slurry me ka cellulose ether, hiki i ka ʻili ke maloʻo a me ka crusting, a nalowale koke ka wai. , a ua emi ka hana. Ma hope o ka hoʻohui ʻana i ka cellulose ether, ʻaʻohe ʻili ma ka ʻili, ua liʻiliʻi ka nalowale o ka wai i ka manawa, a ua maikaʻi ka hana. I loko o ka pae hoʻāʻo, ʻo ka liʻiliʻi o ka nalowale o ka wai he 5 mm i 60 mau minuke. Ka Ikepili o ka ikepili ho'āʻo hōʻike 'ia, Ka nui o ka haʻahaʻa-viscosity cellulose etera i liʻiliʻi ka hopena ma ka mua fluidity o UHPC, akā, ua oi aku ka hopena i ka lilo o ka fluidity i ka manawa. Ke hoʻohui ʻole ʻia ka cellulose ether, ʻo 15 mm ka nalowale o ka wai o UHPC; Me ka piʻi ʻana o ka HPMC, e emi ana ka wai o ka mortar; i ka 0.75% o ka dosage, ʻo ka liʻiliʻi loa o ka nalowale o ka wai o UHPC me ka manawa, ʻo ia ka 5mm; ma hope o ia, me ka mahuahua o ka HPMC, ka fluidity poho o UHPC me ka manawa Aneane loli.

Ma hopeHPMCua hui pū ʻia me UHPC, pili ia i nā waiwai rheological o UHPC mai ʻelua ʻaoʻao: ʻo ka mea hoʻokahi e lawe ʻia nā micro-bubbles kūʻokoʻa i loko o ke kaʻina hoʻouluulu, e hana ai i ka aggregate a lele lehu a me nā mea ʻē aʻe e hana i kahi "pōpopo", e hoʻonui ai i ka. workability Ma ka manawa like, hiki i ka nui o nā mea cementitious ke hoʻopaʻa i ka aggregate, i hiki ke hoʻopaʻa ʻia ka aggregate i loko o ka slurry, a hiki ke neʻe manuahi, hoʻemi ʻia ka friction ma waena o nā aggregates, a hoʻonui ʻia ka wai; ʻo ka lua e hoʻonui i ka UHPC ʻO ka ikaika cohesive e hoʻemi i ka wai. No ka hoʻohana ʻana o ka hoʻāʻo i ka HPMC haʻahaʻa haʻahaʻa, ua like ka ʻaoʻao mua me ka ʻaoʻao ʻelua, a ʻaʻole loli nui ka wai mua, akā hiki ke hoʻemi ʻia ka nalowale o ka wai i ka manawa. Wahi a ka nānā ʻana o nā hopena hoʻāʻo, hiki ke ʻike ʻia ʻo ka hoʻohui ʻana i kahi nui kūpono o HPMC i UHPC hiki ke hoʻomaikaʻi nui i ka hana kūkulu ʻana o UHPC.

2.2 Hoʻonohonoho manawa

Mai ka hoʻololi ʻana o ka manawa hoʻonohonoho o UHPC i hoʻopilikia ʻia e ka nui o ka HPMC, hiki ke ʻike ʻia he hana hoʻopaneʻe ka HPMC ma UHPC. ʻO ka nui o ka nui, ʻoi aku ka maopopo o ka hopena hoʻopaneʻe. Ke 0.50% ka nui, ʻo ka manawa hoʻonohonoho o ka mortar he 55min. Ke hoʻohālikelike ʻia me ka pūʻulu mana (40 min), ua hoʻonui ʻia e 37.5%, a ʻaʻole maopopo ka piʻi. I ka 1.00% o ka dosage, ʻo ka manawa hoʻonohonoho o ka mortar he 100 min, ʻo ia ka 150% kiʻekiʻe ma mua o ka hui mana (40 min).

ʻO nā hiʻohiʻona molecular structure o cellulose ether e pili ana i kona hopena hoʻopaneʻe. ʻO ka molecular molecular structure in cellulose ether, ʻo ia hoʻi, ka anhydroglucose ring structure, hiki ke hana me nā ion calcium e hana i nā pūhui kōpaʻa-calcium molecular, e hōʻemi ana i ka manawa induction o ka hopena hydration clinker. ʻO Ca(OH)2, e hoʻemi ana i ka wikiwiki o ka hopena hydration sima, a laila e hoʻopaneʻe i ka hoʻonohonoho ʻana o ka sima.

2.3 Ka ikaika compressive

Mai ka pilina ma waena o ka ikaika compressive o nā laʻana UHPC i nā lā 7 a me 28 a me ka ʻike o HMPC, hiki ke ʻike maopopo ʻia ʻo ka hoʻohui ʻana o HPMC e hoʻonui mālie i ka emi ʻana o ka ikaika compressive o UHPC. 0.25% HPMC, ka compressive ikaika o UHPC emi iki, a me ka compressive ikaika lākiō o 96%. ʻO ka hoʻohui ʻana i ka 0.50% HPMC ʻaʻohe hopena i ʻike ʻia i ka ratio ikaika compressive o UHPC. E hoʻomau i ka hoʻohui ʻana i ka HPMC i loko o ke ʻano o ka hoʻohana ʻana, UHPC's Ua emi nui ka ikaika compressive. Ke piʻi aʻe ka ʻike o ka HPMC i 1.00%, ua hāʻule ka lakene ikaika compressive i 66%, a ua koʻikoʻi ka nalowale o ka ikaika. Wahi a ka ʻikepili ʻikepili, ʻoi aku ka maikaʻi o ka hoʻohui ʻana i ka 0.50% HPMC, a liʻiliʻi ka nalowale o ka ikaika compressive.

Loaʻa i ka HPMC kekahi hopena ea. ʻO ka hoʻohui ʻana o HPMC e hoʻoulu i kekahi nui o nā microbubbles i UHPC, kahi e hōʻemi ai i ka nui o ka UHPC hui hou. Ma hope o ka paʻakikī o ka slurry, e piʻi mālie ka porosity a e emi pū ka compactness, ʻoi aku ka HPMC maʻiʻo. Kiʻekiʻe. Eia kekahi, me ka hoʻonui ʻana o ka nui o ka HPMC i hoʻokomo ʻia, aia nō ka nui o nā polymers maʻalahi i nā pores o UHPC, ʻaʻole hiki ke hoʻokani i kahi kuleana koʻikoʻi i ka rigidity maikaʻi a me ke kākoʻo compressive i ka wā e hoʻopili ʻia ai ka matrix o ka composite cementitious. .No laila, ʻo ka hoʻohui ʻana o HPMC e hoʻemi nui i ka ikaika compressive o UHPC.

2.4 Ka ikaika wiliwili

Mai ka pilina ma waena o ka ikaika flexural o UHPC samples ma 7 lā a me 28 lā a me ka maʻiʻo o HMPC, hiki ke ʻike ʻia he ʻano like nā pihi hoʻololi o ka ikaika flexural a me ka ikaika compressive, a me ka hoʻololi ʻana o ka ikaika flexural ma waena o 0 a me 0.50% ʻaʻole like ka HMPC. Ke hoʻomau nei ka hoʻohui ʻana o HPMC, ua emi nui ka ikaika flexural o nā laʻana UHPC.

ʻO ka hopena o ka HPMC i ka ikaika flexural o UHPC ka mea nui ma nā ʻano ʻekolu: cellulose ether he retarding a me ka ea-entraining hopena, e hōʻemi i ka ikaika flexural o UHPC; a ʻo ke kolu o ka ʻaoʻao, ʻo ia ka polymer maʻalahi i hana ʻia e ka cellulose ether, ʻO ka hoʻohaʻahaʻa ʻana i ka rigidity o ka specimen e lohi iki i ka emi ʻana o ka ikaika flexural o ka specimen. ʻO ka noho like ʻana o kēia mau ʻano ʻekolu e hōʻemi i ka ikaika compressive o ka specimen UHPC a hoʻemi pū i ka ikaika flexural.

2.5 Axial ikaika tensile a me ka hope tensile waiwai

Ka pilina ma waena o ka ikaika tensile o UHPC specimens ma 7 d a me 28 d a me ka maʻiʻo o HMPC. Me ka hoʻonui ʻana o ka ʻike o ka HPMC, ua hoʻololi iki ka ikaika tensile o nā specimens UHPC a laila emi wikiwiki. Hōʻike ka ʻōkuhi ikaika tensile i ka wā e piʻi ai ka ʻike o ka HPMC i ka specimen i 0.50%, ʻo 12.2MPa ka nui o ka ikaika tensile axial o ka specimen UHPC, a ʻo ka tensile ikaika ratio he 103%. Me ka hoʻonui hou aʻe o ka HPMC maʻiʻo o ka specimen, ke axial Ua hoʻomaka ka hāʻule nui o ka waiwai o ka ikaika tensile waena. I ka 0.75% a me 1.00% ka helu HPMC o ka specimen, ʻo 94% a me 78% ka nui o ka ikaika tensile, ʻoi aku ka haʻahaʻa ma mua o ka ikaika tensile axial o UHPC me ka HPMC ʻole.

Mai ka pilina ma waena o nā koina tensile hope loa o nā laʻana o UHPC i nā lā 7 a me 28 a me ka ʻike o ka HMPC, hiki ke ʻike ʻia ʻaʻole i loli ka nui o nā waiwai tensile me ka piʻi ʻana o ka cellulose ether i ka hoʻomaka, a i ka wā o ka ʻike Hiki i ka cellulose ether ke 0.50% a laila hoʻomaka e hāʻule koke.

ʻO ka hopena o ka hoʻohui ʻana o ka HPMC i ka ikaika tensile axial a me ka waiwai tensile hope loa o nā specimens UHPC e hōʻike ana i kahi ʻano o ka mālama ʻana ʻaʻole i loli a laila emi. ʻO ke kumu nui ka hiki ke hoʻokumu pololei ʻia ka HPMC ma waena o nā ʻāpana cement hydrated ʻO kahi ʻāpana o ka polymer sealing film e pāʻani ana i ke kuleana o ka hoʻopaʻa ʻana, no laila e mālama ʻia kahi nui o ka wai ma UHPC, e hāʻawi ana i ka wai kūpono no ka hoʻomohala mau ʻana o ka hydration hou. o ka sima, pela e hoonui ai i ka ikaika o ka sima. ʻO ka hoʻohui ʻana o HPMC e hoʻomaikaʻi i ka ʻO ka cohesiveness o UHPC e hāʻawi i ka slurry me ka maʻalahi, ka mea e hoʻololi pono ai ka UHPC i ka shrinkage a me ka deformation o ka mea kumu, a hoʻomaikaʻi iki i ka ikaika tensile o UHPC. Eia nō naʻe, ke ʻoi aku ka ʻike o ka HPMC i ka waiwai koʻikoʻi, pili ka ea i hoʻokomo ʻia i ka ikaika o ka specimen. ʻO nā hopena maikaʻi ʻole i hoʻokani mālie i kahi kūlana alakaʻi, a hoʻomaka ka emi ʻana o ka ikaika tensile axial a me ka waiwai tensile hope loa o ka specimen.

3. Ka hopena

1) Hiki i ka HPMC ke hoʻomaikaʻi maikaʻi i ka hana hana o ka mālama ʻana i ka wela maʻamau i ka UHPC, hoʻolōʻihi i kona manawa coagulation a hoʻemi i ka nalowale o ka wai o ka UHPC i hui pū ʻia i ka manawa.

2) ʻO ka hoʻohui ʻana o HPMC e hoʻolauna i kahi nui o nā puʻupuʻu liʻiliʻi i ka wā o ka hoʻoulu ʻana o ka slurry. Inā ʻoi aku ka nui o ka nui, e hōʻiliʻili nui nā ʻōhū a nui aʻe. Paʻa loa ka slurry, ʻaʻole hiki ke kahe a nahā nā ʻōhū. Hoʻemi nā pores o ka UHPC paʻakikī; Eia kekahi, ʻaʻole hiki i ka polymer maʻalahi i hana ʻia e HPMC ke hāʻawi i ke kākoʻo paʻa i ka wā i lalo o ke kaomi, a ua hoʻemi nui ʻia ka ikaika compressive a me ka flexural.

3) ʻO ka hoʻohui ʻana o HPMC e hana i ka plastik UHPC a maʻalahi. ʻAʻole hiki ke loli ka ikaika axial tensile a me ka waiwai tensile hope o nā specimens UHPC me ka hoʻonui ʻana o ka ʻike HPMC, akā inā ʻoi aku ka nui o ka HPMC ma mua o kekahi waiwai, ʻo ka ikaika tensile axial a me nā waiwai tensile hope e hoʻemi nui ʻia.

4) I ka hoʻomākaukau ʻana i ka mahana maʻamau e ho'ōla ai i ka UHPC, pono e hoʻomalu pono ʻia ke ʻano o ka HPMC. I ka 0.50% o ka dosage, hiki ke hoʻonohonoho maikaʻi ʻia ka pilina ma waena o ka hana hana a me nā waiwai mechanical o ka mālama ʻana i ka mahana maʻamau UHPC.