Methyl cellulose ether na ime ụlọ okpomọkụ na-agwọta ultra-high arụmọrụ ihe

Nkọwa: Site n'ịgbanwe ọdịnaya nke hydroxypropyl methylcellulose ether (HPMC) na okpomọkụ nkịtị na-agwọta ultra-high performance concrete (UHPC), mmetụta nke cellulose ether na mmiri mmiri, ịtọ oge, ike mkpakọ, na ike mgbanwe nke UHPC mụrụ. , Axial tensile ike na uru tensile kacha, na a tụlere nsonaazụ ya. Nsonaazụ ule na-egosi na: ịgbakwụnye ihe karịrị 1.00% nke obere viscosity HPMC anaghị emetụta mmiri nke UHPC, mana ọ na-ebelata mfu nke mmiri mmiri ka oge na-aga. , na ịgbatị oge nhazi, na-eme ka arụmọrụ ụlọ dịkwuo mma; mgbe ọdịnaya na-erughị 0.50%, mmetụta na mkpakọ ike, ike mgbanwe na axial tensile ike adịghị mkpa, na ozugbo ọdịnaya bụ ihe karịrị 0.50%, ya n'ibu Ọrụ na-ebelata karịa 1/3. N'ịtụle arụmọrụ dị iche iche, usoro ọgwụgwọ HPMC akwadoro bụ 0.50%.

Isi okwu: ultra-elu arụmọrụ ihe; cellulose ether; ọgwụgwọ okpomọkụ nkịtị; ike mkpakọ; ike mgbanwe; ike ọdụdọ

0,Okwu mmalite

Site na mmepe ngwa ngwa nke ụlọ ọrụ ihe owuwu nke China, ihe achọrọ maka ịrụ ọrụ kọmpụta na injinia n'ezie abawanyela, na emepụtara kọmpụta arụmọrụ dị oke elu (UHPC) na nzaghachi nke ihe achọrọ. The ezigbo nkezi nke ahụ dị iche iche urughuru nha na-theoretically e mere, na weere na ígwè eriri na elu-oru arụmọrụ mmiri mbenata gị n'ụlọnga, ọ nwere magburu onwe Njirimara dị ka ultra-elu compressive ike, elu siri ike, elu ujo eguzogide anwụ ngwa ngwa na ike onwe-agwọ ọrịa. ike nke micro-cracks. Arụmọrụ. Nnyocha teknụzụ mba ofesi na UHPC tozuru oke ma etinyere ya n'ọtụtụ ọrụ bara uru. E jiri ya tụnyere mba ndị ọzọ, nyocha ụlọ adịghị omimi nke ọma. Dong Jianmiao na ndị ọzọ mụrụ eriri incorporation site n'ịgbakwụnye dị iche iche ụdị na ichekwa nke eriri. Usoro mmetụta na iwu nke ihe; Chen Jing et al. mụọ mmetụta nke dayameta eriri igwe na arụmọrụ nke UHPC site na ịhọrọ eriri igwe nwere dayameta anọ. UHPC nwere naanị ọnụ ọgụgụ dị nta nke ngwa injinia na China, ọ ka nọkwa na ọkwa nyocha nyocha. Arụmọrụ nke UHPC Superiority abụrụla otu n'ime ntụzịaka nyocha nke mmepe ihe, mana a ka nwere ọtụtụ nsogbu a ga-edozi. Dị ka nnukwu ihe achọrọ maka akụrụngwa, ọnụ ahịa dị elu, usoro nkwadebe mgbagwoju anya, wdg, na-egbochi mmepe nke teknụzụ mmepụta UHPC. N'ime ha, iji uzuoku dị elu na-agwọta UHPC na okpomọkụ dị elu nwere ike ime ka ọ nweta ihe ndị dị elu na-arụ ọrụ na ịdịte aka. Otú ọ dị, n'ihi usoro ọgwụgwọ uzuoku siri ike na ihe dị elu chọrọ maka ngwá ọrụ mmepụta ihe, ntinye nke ihe nwere ike ịbụ nanị na ebe a na-emepụta ihe na-emepụta ihe, na-enweghịkwa ike ịrụ ọrụ nkedo. Ya mere, ọ bụghị ihe kwesịrị ekwesị ịmụta usoro nke thermal ọgwụgwọ na n'ezie oru ngo, na ọ dị mkpa ime nnyocha miri emi na nkịtị okpomọkụ ọgwụgwọ UHPC.

Okpomọkụ na-agwọta UHPC dị n'usoro nyocha na China, yana oke mmiri na-ekekọta ya dị oke ala, ọ na-enwekwa ike ịkpọ nkụ ngwa ngwa n'elu mgbe a na-ewu ụlọ. Iji mee ka ọnọdụ akpịrị ịkpọ nkụ dịkwuo mma nke ọma, ihe ndị sitere na simenti na-etinyekarị ihe ndị na-eme ka mmiri sie ike na ihe ahụ. Ngwa kemịkalụ iji gbochie nkewa na ọbara ọgbụgba nke ihe, welie njigide mmiri na njikọta, melite arụmọrụ ihe owuwu, ma na-emeziwanye ihe ndị sitere na ciment nke ọma. Hydroxypropyl methyl cellulose ether (HPMC) dị ka polymer Thickener, nke nwere ike n'ụzọ dị irè na-ekesa polymer gelled slurry na ihe na ciment dabeere ihe evenly, na free mmiri na slurry ga-abụ agbụ mmiri, nke mere na ọ dịghị mfe ida si. slurry na melite arụmọrụ njigide mmiri nke ihe . Iji belata mmetụta nke cellulose ether na mmiri nke UHPC, a na-ahọrọ cellulose ether dị ala viscosity maka ule.

Na nchịkọta, iji melite arụmọrụ ihe owuwu na ndabere nke n'ịhụ na n'ibu Njirimara nke nkịtị-okpomọkụ ọgwụgwọ UHPC, akwụkwọ a na-amụ mmetụta nke obere viscosity cellulose ether ọdịnaya na nkịtị-okpomọkụ ọgwụgwọ dabere na chemical Njirimara nke cellulose ether. na usoro ya na-eme na UHPC slurry. Mmetụta nke fluidity, oge coagulation, ike mkpakọ, ike mgbanwe, ike axial ike na uru tensile kacha nke UHPC iji chọpụta usoro kwesịrị ekwesị nke cellulose ether.

1. Nyochaa atụmatụ

1.1 Nwalee akụrụngwa na ngwakọta ngwakọta

Ngwa ngwa maka ule a bụ:

1) Cement: P·O 52.5 simenti Portland nkịtị emepụtara na Liuzhou.

2) Ash na-efe efe: ntụ ijiji emepụtara na Liuzhou.

3) Slag ntụ ntụ: S95 granulated gbawara ọkụ slag ntụ ntụ emepụtara na Liuzhou.

4) Silica fume: silica fume nke ezoro ezo, ntụ ntụ ntụ, ọdịnaya SiO2≥92%, mpaghara elu akọwapụtara nke ọma 23 m²/g.

5) Quartz ájá: 20 ~ 40 ntupu (0.833 ~ 0.350 mm).

6) Onye na-ebelata mmiri: polycarboxylate onye na-ebelata mmiri, ntụ ntụ ọcha, ọnụego mbelata mmiri≥30%

7) Uzuzu latex: ntụ ntụ latex redispersible.

8) Fiber ether: hydroxypropyl methylcellulose METHOCEL emepụtara na United States, viscosity 400 MPa s.

9) eriri igwe: ogologo ọla kọpa-plated microwire ígwè eriri, dayametaφ bụ 0.22 mm, ogologo bụ 13 mm, ike tensile bụ 2 000 MPa.

Mgbe a otutu nke ibuo nnyocha ná mmalite ogbo, e nwere ike kpebisie ike na isi mix ruru nke nkịtị okpomọkụ ọgwụgwọ ultra-elu arụmọrụ ihe bụ ciment: ofufe uyi: ịnweta ntụ ntụ: silica fume: ájá: mmiri na-ebelata gị n'ụlọnga: latex ntụ ntụ: mmiri = 860: 42: 83: 110: 980: 11: 2: 210, ọdịnaya nke eriri nchara nchara bụ 2%. Tinye 0, 0.25%, 0.50%, 0.75%, 1.00% HPMC nke cellulose ether (HPMC) ọdịnaya na nke a bụ isi mix ratio Tọlite ​​ntụle n'otu n'otu.

1.2 Usoro ule

Tulee akụrụngwa ntụ ntụ dị ka ngwakọta agwakọta si dị ma tinye ha na ogwe igwe kwụ otu ebe HJW-60 nke amanyere igwekota ihe. Malite mixer ruo mgbe edo, tinye mmiri na mix maka nkeji 3, gbanyụọ igwekota, tinye eriri ígwè a tụrụ atụ ma malitegharịa igwekota maka nkeji 2. Emere ka ọ bụrụ slurry UHPC.

Ihe nnwale ahụ gụnyere mmiri mmiri, oge ịtọ ntọala, ike mkpakọ, ike mgbanwe, ike ike axial na uru nkwụcha ikpeazụ. A na-ekpebi nyocha nke mmiri dị ka JC/T986-2018 "Ihe ndị na-emepụta ihe na-emepụta ciment". Nnwale oge ntọala dị ka GB/T 1346 si dị-2011 "Cment Standard Consistance Consumption Water and Setting Time Test Method". A na-ekpebi ule ike mgbanwe dị ka GB/T50081-2002 "Standard for Test Method of Mechanical Properties of Ordinary Concrete". Nnwale ike mkpakọ, ike axial axial na A na-ekpebi ule uru ikpeazụ dị ka DLT5150-2001 “Iwu Nleba Ihe Nleba Hydraulic Concrete”.

2. Nsonaazụ ule

2.1 Mmiri mmiri

Nsonaazụ nyocha nke mmiri na-egosi mmetụta nke ọdịnaya HPMC na mfu nke mmiri mmiri UHPC ka oge na-aga. A na-ahụta site na nlele ule na mgbe slurry na-enweghị cellulose ether na-akpalite nke ọma, elu ahụ na-adịkarị ka akpịrị ịkpọ nkụ na crusting, na mmiri mmiri na-efunahụ ngwa ngwa. , na arụ ọrụ emebiela. Mgbe agbakwunyere cellulose ether, ọ dịghị akpụkpọ anụ dị n'elu, mfu nke mmiri na-egbu oge dị ntakịrị, na ọrụ ahụ nọgidere na-adị mma. N'ime oke ule ahụ, mfu kacha nta nke mmiri mmiri bụ 5 mm n'ime nkeji 60. Nyocha nke data ule na-egosi na, Ọnụ ọgụgụ nke cellulose ether dị ala na-enwe mmetụta dị nta na mbido mbụ nke UHPC, ma ọ na-enwe mmetụta dị ukwuu na nkwụsị nke mmiri mmiri na oge. Mgbe enweghị cellulose ether agbakwunyere, mfu mmiri nke UHPC bụ 15 mm; Site na mmụba nke HPMC, mfu mmiri nke ngwa agha na-ebelata; mgbe usoro onunu ogwu bụ 0.75%, mfu mmiri nke UHPC bụ nke kacha nta na oge, nke bụ 5mm; Mgbe nke ahụ gasịrị, na mmụba nke HPMC, mfu mmiri nke UHPC na oge ọ fọrọ nke nta ka ọ gbanwee.

MgbeHPMCna-agwakọta na UHPC, ọ na-emetụta rheological Njirimara nke UHPC si abụọ akụkụ: otu bụ na onwe micro-egosipụta na-ada n'ime akpali akpali usoro, nke na-eme ka mkpokọta na ofufe ash na ihe ndị ọzọ na-etolite a "mmetụta bọl", nke na-abawanye na workability N'otu oge ahụ, nnukwu ego nke cementious ihe nwere ike kechie mkpokọta, nke mere na mkpokọta nwere ike ọbụna "kwụsịtụrụ" na slurry, na nwere ike ịkwaga n'efu, esemokwu n'etiti mkpokọta na-ebelata, na fluidity na-abawanye; nke abụọ bụ ịbawanye UHPC Ike ọnụ na-ebelata mmiri mmiri. Ebe ọ bụ na ule ahụ na-eji HPMC dị obere viscosity, akụkụ nke mbụ hà nhata na akụkụ nke abụọ, na mmiri mbụ adịghị agbanwe nke ukwuu, mana enwere ike ibelata nkwụsị nke mmiri mmiri n'oge. Dabere na nyocha nke nsonaazụ ule, enwere ike ịmara na ịgbakwunye HPMC kwesịrị ekwesị na UHPC nwere ike melite arụmọrụ ụlọ nke UHPC nke ukwuu.

2.2 ịtọ oge

Site na mgbanwe mgbanwe nke oge mwube nke UHPC metụtara ọnụọgụ HPMC, enwere ike ịhụ na HPMC na-arụ ọrụ azụ azụ na UHPC. Ọnụ ego ahụ buru ibu, ka ọ na-apụta ìhè karịa mmetụta azụ azụ. Mgbe ego ahụ bụ 0.50%, oge nhazi nke ngwa agha bụ 55min. E jiri ya tụnyere otu njikwa (40 min), ọ mụbara site na 37.5%, mmụba ahụ ka edoghị anya. Mgbe usoro ọgwụgwọ ahụ bụ 1.00%, oge nhazi nke ngwa agha bụ 100 min, nke dị 150% dị elu karịa nke otu njikwa (40 min).

Njirimara usoro ihe omimi nke cellulose ether na-emetụta mmetụta azụ azụ ya. Ihe owuwu molekụla dị mkpa na cellulose ether, ya bụ, ihe mgbanaka anhydroglucose, nwere ike meghachi omume na ion calcium iji mepụta ogige molekụla shuga-calcium, na-ebelata oge induction nke ciment clinker hydration mmeghachi omume Nta nke calcium ion dị ala, na-egbochi mmiri ozuzo ọzọ. Ca (OH) 2, na-ebelata ọsọ nke mmeghachi omume hydration ciment, si otú ahụ na-egbu oge nhazi nke ciment.

2.3 ike mkpakọ

Site na mmekọrịta dị n'etiti ike mkpakọ nke ihe nlele UHPC na ụbọchị 7 na ụbọchị 28 na ọdịnaya nke HMPC, enwere ike ịhụ nke ọma na mgbakwunye nke HPMC ji nwayọọ nwayọọ na-abawanye mbelata nke ike mkpakọ nke UHPC. 0.25% HPMC, ike mkpakọ nke UHPC na-ebelata ntakịrị, na ike mkpakọ bụ 96%. Ịtinye 0.50% HPMC enweghị mmetụta doro anya na oke ike mkpakọ nke UHPC. Gaa n'ihu na-agbakwunye HPMC n'ime oke ojiji, UHPC's Ike mkpakọ gbadara nke ọma. Mgbe ọdịnaya nke HPMC mụbara ruo 1.00%, oke ike mkpakọ gbadara ruo 66%, na ọnwụ ike dị njọ. Dị ka nyocha data si kwuo, ọ ka mma ịgbakwunye 0.50% HPMC, na ọnwụ nke ike mkpakọ dị ntakịrị.

HPMC nwere ụfọdụ mmetụta na-akpali ikuku. Mgbakwunye nke HPMC ga-eme ka ụfọdụ microbubbles na UHPC, nke ga-ebelata nnukwu njupụta nke UHPC agwakọtara ọhụrụ. Mgbe slurry ahụ gbasiri ike, porosity ga-eji nwayọọ nwayọọ na-abawanye na kọmpat ga-ebelata, karịsịa ọdịnaya HPMC. Nke ka elu. Tụkwasị na nke ahụ, na mmụba nke ọnụ ọgụgụ nke HPMC ewepụtara, a ka nwere ọtụtụ polymers na-agbanwe agbanwe na pores nke UHPC, nke na-enweghị ike ịrụ ọrụ dị mkpa na nkwado siri ike na nkwado mkpakọ mgbe a na-ejikọta matriks nke cementious composite. .Ya mere, mgbakwunye nke HPMC na-ebelata ike mkpakọ nke UHPC.

2.4 ike mgbanwe

Site na mmekọrịta dị n'etiti ike mgbanwe nke ihe atụ UHPC na ụbọchị 7 na ụbọchị 28 na ọdịnaya nke HMPC, a pụrụ ịhụ na mgbanwe mgbanwe nke ike na-agbanwe agbanwe na ike mkpakọ yiri ya, na mgbanwe nke ike mgbanwe n'etiti 0 na 0.50% HMPC abụghị otu. Ka mgbakwunye HPMC gara n'ihu, ike mgbanwe nke ihe nlele UHPC belatara nke ukwuu.

Mmetụta nke HPMC na ike mgbanwe nke UHPC bụ tumadi na akụkụ atọ: cellulose ether nwere retarding na ikuku-entraning mmetụta, nke na-ebelata ike mgbanwe nke UHPC; na akụkụ nke atọ bụ polymer na-agbanwe agbanwe nke ether cellulose na-emepụta, Mbelata nkwụsi ike nke ihe atụ ahụ na-ebelata mbelata nke ike mgbanwe nke ihe nlele ahụ ntakịrị. Ịdị n'otu oge nke akụkụ atọ ndị a na-ebelata ike mkpakọ nke ụdị UHPC ma na-ebelatakwa ike mgbanwe.

2.5 Axial tensile ike na uru tensile kacha

Mmekọrịta dị n'etiti ike tensile nke ụdị UHPC na 7 d na 28 d yana ọdịnaya nke HMPC. Site na mmụba nke ọdịnaya nke HPMC, ike nkwụsị nke ụdị UHPC buru ụzọ gbanwee ntakịrị wee belata ngwa ngwa. Mkpịsị aka ike na-egosi na mgbe ọdịnaya nke HPMC dị na ụdị ahụ ruru 0.50%, uru ike ike axial nke ihe atụ UHPC bụ 12.2MPa, na oke ike ike bụ 103%. Site na mmụba ọzọ nke ọdịnaya HPMC nke ihe nlere anya, axial The Central tensile ike uru malitere ịda nke ọma. Mgbe ọdịnaya HPMC nke ihe nlere ahụ bụ 0.75% na 1.00%, oke ike tensile bụ 94% na 78%, n'otu n'otu, nke dị ala karịa ike axial tensile nke UHPC na-enweghị HPMC.

Site na mmekọrịta dị n'etiti ụkpụrụ tensile kacha elu nke ihe atụ UHPC na ụbọchị 7 na ụbọchị 28 na ọdịnaya nke HMPC, enwere ike ịhụ na ụkpụrụ nkwụsị nke kachasị elu fọrọ nke nta ka ọ ghara ịgbanwe na mmụba nke cellulose ether na mmalite, na mgbe ọdịnaya nke cellulose ether ruru 0.50 % wee malite ịda ngwa ngwa.

Mmetụta nke mgbakwunye ego nke HPMC na ike axial axial na uru tensile kacha elu nke ụdị UHPC na-egosi usoro nke idobe ihe fọrọ nke nta ka ọ bụrụ mgbanwe wee na-ebelata. Isi ihe kpatara ya bụ na HPMC nwere ike guzobe ozugbo n'etiti hydrated ciment particles A oyi akwa nke waterproof polymer sealing film arụ ọrụ nke sealing, nke mere na a ụfọdụ ego nke mmiri na-echekwara na UHPC, nke na-enye mmiri dị mkpa maka na-aga n'ihu mmepe nke n'ihu hydration. nke ciment, si otú ahụ na-eme ka ike nke ciment dịkwuo mma. Mgbakwunye nke HPMC na-eme ka ịdị n'otu nke UHPC na-eme ka slurry na-agbanwe agbanwe, nke na-eme ka UHPC kwekọọ n'ụzọ zuru ezu na nkwụsịtụ na nrụrụ nke ihe ndabere, ma na-eme ka ike dị ike nke UHPC dịkwuo mma. Agbanyeghị, mgbe ọdịnaya nke HPMC karịrị uru dị oke egwu, ikuku etinyere na-emetụta ike nke ụdị ahụ. Mmetụta ọjọọ ndị ahụ ji nwayọọ nwayọọ na-ekere òkè na-eduga, na ike ike nke axial na uru nkwụsị ikpeazụ nke ihe atụ ahụ malitere ibelata.

3. Nkwubi okwu

1) HPMC nwere ike melite arụmọrụ arụ ọrụ nke ọgwụgwọ UHPC nkịtị, gbatịa oge coagulation ya ma belata mfu mmiri nke UHPC agwakọtara ọhụrụ ka oge na-aga.

2) Mgbakwunye nke HPMC na-ewebata ụfọdụ obere egosipụta n'oge usoro mkpali nke slurry. Ọ bụrụ na ego ahụ buru ibu, afụ ga-agbakọta nke ukwuu wee mepụta nnukwu afụ. Ọkpụkpọ ahụ na-ejikọta ọnụ nke ukwuu, na afụ enweghị ike ịfebiga ma gbawaa. Oghere nke UHPC siri ike na-ebelata; na mgbakwunye, polymer na-agbanwe agbanwe nke HPMC na-emepụta enweghị ike inye nkwado siri ike mgbe ọ nọ n'okpuru nrụgide, na ike mkpakọ na mgbanwe na-ebelata nke ukwuu.

3) Mgbakwunye nke HPMC na-eme ka UHPC plastic na mgbanwe. Ike axial axial na uru tensile ikpeazụ nke ụdị UHPC anaghị agbanwe site na mmụba nke ọdịnaya HPMC, mana mgbe ọdịnaya HPMC karịrị otu uru, A na-ebelata ike ike nke axial na ụkpụrụ tensile kacha.

4) Mgbe ị na-akwadebe ọgwụgwọ ọgwụgwọ UHPC nkịtị, a ga-achịkwa usoro onunu ogwu nke HPMC. Mgbe usoro onunu ogwu bụ 0.50%, enwere ike ịhazi mmekọrịta dị n'etiti arụmọrụ na-arụ ọrụ na akụrụngwa akụrụngwa nke ọgwụgwọ UHPC nkịtị.