Cellulose ether na ngwa agha na-ebuli onwe ya

Mmetụta nkehydroxypropyl methyl cellulose etherna mmiri mmiri, njide mmiri na ike njikọ nke ngwa agha na-edozi onwe ya ka a mụrụ. Nsonaazụ gosiri na HPMC nwere ike melite njide mmiri nke ngwa agha na-ebuli onwe ya nke ọma ma belata nkwụsi ike nke ngwa agha. Iwebata HPMC nwere ike imeziwanye ike njikọ nke ngwa agha, mana ike mkpakọ, ike mgbanwe na mmiri na-ebelata. A na-eme nyocha ọdịiche nke SEM na ihe nlele ahụ, na mmetụta nke HPMC na mmetụta retarding, njide mmiri na ike nke ngwa agha ka a kọwakwuru site na usoro hydration nke ciment na 3 na 28 ụbọchị.

Isi okwu:ngwa agha nke onwe; cellulose ether; Mmiri mmiri; Njide mmiri

0. Okwu mmalite

Ngwa agha nke na-ebuli onwe ya nwere ike ịdabere n'onwe ya iji mepụta ntọala dị larịị, dị nro na nke siri ike na mkpụrụ ahụ, ka ịtọba ma ọ bụ jikọta ihe ndị ọzọ, ma nwee ike ịrụ nnukwu ebe a na-arụ ọrụ dị elu, ya mere, nnukwu mmiri mmiri bụ a. akụkụ dị oke mkpa nke ngwa agha na-ebuli onwe ya; Karịsịa dị ka nnukwu olu, mesikwuru ok ma ọ bụ oghere na-erughị 10 mm backfill ma ọ bụ ike ojiji nke grouting ihe. Na mgbakwunye na ezigbo mmiri mmiri, ngwa agha na-ebuli onwe ya aghaghị inwe ụfọdụ njide mmiri na ike njikọ, ọ dịghị ihe dị iche iche na-agba ọbara, ma nwee àgwà nke adiabatic na obere okpomọkụ ịrị elu.

N'ozuzu, ngwa agha na-ebuli onwe ya na-achọ ezigbo mmiri mmiri, mana ezigbo mmiri nke ciment slurry na-abụkarị naanị 10 ~ 12 cm. Ngwa agha na-ebuli onwe ya nwere ike ịmekọ onwe ya, na oge nhazi mbụ dị ogologo ma oge nhazi ikpeazụ dị mkpụmkpụ. Cellulose ether bụ otu n'ime ndị isi mgbakwunye nke njikere-agwakọta ngwa agha, ọ bụ ezie na mgbakwunye ego dị nnọọ ala, ma nwere ike budata melite arụmọrụ nke ngwa agha, ọ nwere ike melite agbanwe agbanwe nke ngwa agha, ịrụ ọrụ arụmọrụ, bonding arụmọrụ na mmiri njigide arụmọrụ, nwere. ọrụ dị oke mkpa n'ọhịa nke ngwa agha agwakọta dị njikere.

1. Ihe akụrụngwa na ụzọ nyocha

1.1 Akụrụngwa

(1) Nkịtị P·O 42.5 ọkwa ciment.

(2) Ihe ájá: Xiamen na-asacha ájá osimiri, nha nha bụ 0.3 ~ 0.6mm, ọdịnaya mmiri bụ 1% ~ 2%, ihicha artificial.

(3) Cellulose ether: hydroxypropyl methyl cellulose ether bụ ngwaahịa nke hydroxyl nọchiri anya methoxy na hydroxypropyl, n'otu n'otu, na viscosity nke 300mpa·s. Ugbu a, ọtụtụ n'ime cellulose ether eji bụ hydroxypropyl methyl cellulose ether na hydroxyethyl methyl cellulose ether.

(4) superplasticizer: polycarboxylic acid superplasticizer.

(5) Redispersible latex ntụ ntụ: HW5115 usoro mepụtara Henan Tiansheng Chemical Co., Ltd bụ a redispersible latex ntụ ntụ copolymerized site VAC/VeoVa.

1.2 Ụzọ nnwale

Emere ule ahụ dị ka ọkọlọtọ ụlọ ọrụ JC/T 985-2005 si dị na “Cment based Self-leveling Mortar for Ground Use”. Ekpebiri oge ntọala site n'ịtụ aka na nhazi ọkọlọtọ na oge nhazi nke JC/T 727 cement paste. Nnwale ngwa ngwa na-eme onwe ya nke ọma na-akpụ, na-ehulata na nyocha ike mkpakọ na-ezo aka na GB/T 17671. Usoro nnwale nke ike njikọ: A na-akwadebe ngọngọ ngwa agha 80mmx80mmx20mm tupu oge eruo, afọ ya karịrị 28d. A na-eme ka elu ahụ sie ike, a na-ehichapụkwa mmiri jupụtara n'elu mgbe 10min gasịrị. A na-awụsa mpempe ule ngwa ngwa n'elu ala a na-egbu maramara nke nwere nha 40mmx40mmx10mm. A na-anwale ike nkekọ na afọ imewe.

A na-eji nyocha eletrọnịkị eletrọnịkị (SEM) nyochaa ọdịdị ọdịdị nke ihe simenti dị na slurry. N'ime ọmụmụ ihe, usoro ịgwakọta ihe niile ntụ ntụ bụ: nke mbụ, a na-agwakọta ihe ntụ ntụ nke akụkụ ọ bụla, wee tinye ya na mmiri a chọrọ maka ịgwakọta otu. A na-enyocha mmetụta nke cellulose ether na ngwa agha na-ebuli onwe ya site na ike, njide mmiri, mmiri mmiri na ule microscopic SEM.

2. Nsonaazụ na nyocha

2.1 Mbugharị

Cellulose ether nwere mmetụta dị mkpa na njide mmiri, nkwụsi ike na ịrụ ọrụ nke mgbidi nke onwe ya. Karịsịa dị ka ngwa agha na-ebuli onwe ya elu, mmiri mmiri bụ otu n'ime ihe ndekọ dị mkpa iji nyochaa arụmọrụ nke ngwa agha na-edozi onwe ya. N'ihe gbasara ijide n'aka na ngwa ngwa nkịtị na-eme ka ọ dị mma, enwere ike ịhazigharị mmiri nke ngwa ngwa site n'ịgbanwe ọdịnaya nke cellulose ether.

Na mmụba nke cellulose ether ọdịnaya. Mmiri nke ngwa agha na-ebelata nke nta nke nta. Mgbe usoro onunu ogwu bụ 0.06%, mmiri mmiri nke ngwa agha na-ebelata karịa 8%, na mgbe usoro onunu ogwu bụ 0.08%, mmiri na-ebelata karịa 13.5%. N'otu oge ahụ, na mgbatị nke afọ, ọnụ ọgụgụ dị elu na-egosi na a ghaghị ịchịkwa ọnụ ọgụgụ nke cellulose ether n'ime ihe dị iche iche, oke doses ga-eweta mmetụta ọjọọ na mmiri mmiri ngwa ngwa. Mmiri na simenti dị na ngwa ngwa na-eme ka slurry dị ọcha iji mejupụta oghere ájá, ma kechie ájá ka ọ rụọ ọrụ mmanye mmanụ, nke mere na ngwa agha ahụ nwere mmiri mmiri. Site na ntinye nke cellulose ether, ọdịnaya nke mmiri n'efu na usoro ahụ na-ebelata ntakịrị, na mkpuchi mkpuchi na mgbidi dị n'elu ájá na-ebelata, si otú a na-ebelata mmiri nke ngwa agha. N'ihi ihe achọrọ nke ngwa agha na-ebuli onwe ya na mmiri dị elu, ekwesịrị ịchịkwa ọnụọgụ cellulose ether n'ụzọ kwesịrị ekwesị.

2.2 Njide mmiri

Njide mmiri nke ngwa agha bụ ihe ndeksi dị mkpa iji tụọ nkwụsi ike nke ihe ndị dị na ngwa ngwa ciment agwakọtara ọhụrụ. Ịgbakwunye cellulose ether kwesịrị ekwesị nwere ike ime ka njide mmiri dị mma. Iji mee ka mmeghachi omume hydration nke ihe simenti dị n'ụzọ zuru ezu, ihe ezi uche dị na ya nke cellulose ether nwere ike idobe mmiri n'ime ngwa agha ogologo oge iji hụ na mmeghachi omume hydration nke ihe simenti nwere ike ịrụ ọrụ zuru oke.

Enwere ike iji cellulose ether mee ihe dị ka onye na-ejigide mmiri n'ihi na ikuku oxygen na hydroxyl na ether bond na-ejikọta ya na mkpụrụ ndụ mmiri iji mepụta njikọ hydrogen, na-eme ka mmiri efu ghọọ mmiri jikọtara ọnụ. Enwere ike ịhụ ya site na mmekọrịta dị n'etiti ọdịnaya nke cellulose ether na mmiri na-ejigide mmiri nke mmiri mmiri na-abawanye na ụba nke cellulose ether. Mmetụta na-ejigide mmiri nke cellulose ether nwere ike igbochi mkpụrụ ahụ ka ọ ghara ịmịnye oke mmiri na mmiri ngwa ngwa, ma gbochie ikuku mmiri, si otú ahụ hụ na gburugburu ebe mmiri na-ekpo ọkụ na-enye mmiri zuru oke maka hydration ciment. E nwekwara ọmụmụ ihe na-egosi na na mgbakwunye na ọnụ ọgụgụ nke cellulose ether, viscosity ya (molecular arọ) na-enwekwa mmetụta dị ukwuu na njigide mmiri ngwa agha, ka viscosity dịkwuo ukwuu, ka mma na-ejigide mmiri. A na-ejikarị cellulose ether na viscosity nke 400 MPa·S eme ihe maka ngwa agha na-edozi onwe ya, nke nwere ike imeziwanye arụmọrụ nke ngwa agha ma mee ka ngwa ngwa dịkwuo mma. Mgbe viscosity karịrị 40000 MPa·S, ọrụ njide mmiri adịghịzi emeziwanye nke ọma, ọ dịghịkwa mma maka ngwa agha na-ebuli onwe ya.

N'ime ọmụmụ ihe a, a na-ewere ihe atụ nke ngwa agha nwere cellulose ether na ngwa agha na-enweghị cellulose ether. Akụkụ nke samples bụ 3d afọ samples, na akụkụ nke ọzọ nke 3d afọ samples bụ ọkọlọtọ gwọrọ maka 28d, na mgbe ahụ guzobe nke ciment hydration ngwaahịa na sample ka SEM nwalere.

Ngwaahịa hydration nke simenti na oghere oghere nke ngwa ngwa na afọ 3d karịa ndị dị na ihe nlele na cellulose ether, na na 28d afọ, ngwaahịa hydration na sample na cellulose ether dị nnọọ ukwuu karịa ndị nọ na oghere oghere. Mmiri mmiri nke mbụ na-egbu oge n'ihi na e nwere ihe nkiri ihe nkiri dị mgbagwoju anya nke cellulose ether kpụrụ n'elu akụkụ ciment na mmalite. Otú ọ dị, na mgbatị nke afọ, usoro hydration na-aga n'ihu nwayọọ nwayọọ. N'oge a, njide mmiri nke cellulose ether na slurry na-eme ka mmiri zuru ezu na slurry iji gboo mkpa nke mmeghachi omume hydration, nke na-eme ka ọganihu zuru oke nke mmeghachi omume hydration. Ya mere, enwere ọtụtụ ngwaahịa hydration na slurry na ọkwa ikpeazụ. N'ikwu okwu n'otu n'otu, enwere mmiri n'efu na ihe nlele efu, nke nwere ike imeju mmiri nke mmeghachi omume ciment mbụ chọrọ. Otú ọ dị, site na ọganihu nke usoro hydration, akụkụ nke mmiri dị na nlele ahụ na-eri site na mmeghachi omume hydration nke mbụ, na akụkụ nke ọzọ na-efunahụ site na evaporation, na-ebute mmiri na-ezughị ezu na slurry ikpeazụ. Ya mere, ngwaahịa hydration 3d dị na oghere oghere dị ntakịrị karịa. Ọnụ ọgụgụ nke ngwaahịa hydration dị obere karịa ọnụ ọgụgụ ngwaahịa hydration dị na nlele nke nwere cellulose ether. Ya mere, site n'echiche nke ngwaahịa hydration, a kọwakwara ọzọ na ịgbakwụnye ether cellulose kwesịrị ekwesị na ngwa agha nwere ike imeziwanye njide mmiri nke slurry.

2.3 ịtọ oge

Cellulose ether nwere mmetụta azụ azụ ụfọdụ na ngwa agha, yana mmụba nke ọdịnaya ether cellulose. A na-agbatịkwa oge ịtọ ngwa ngwa ahụ. Mmetụta azụ azụ nke cellulose ether na-ejikọta ya na njirimara nhazi ya. Cellulose ether nwere dehydrated glucose mgbanaka Ọdịdị, nke nwere ike ịmepụta sugar calcium molecular mgbagwoju ọnụ ụzọ na calcium ions na ciment hydration ngwọta, belata ịta nke calcium ion na ciment hydration oge induction, gbochie guzobe na ọdịda nke Ca (OH) 2 na calcium nnu. kristal, ka ọ na-egbu oge usoro hydration nke ciment. Mmetụta azụ azụ nke cellulose ether na ciment slurry na-adabere n'ogo nke nnọchi nke alkyl ma nwee obere mmekọrịta na ịdị arọ ya. Ka ogo ngbanwe nke alkyl dị ntakịrị, ka ọdịnaya nke hydroxyl na-abawanye, ka mmetụta azụ azụ na-apụtawanye ìhè. L. Semitz et al. kweere na cellulose ether molekul e tumadi adsorbed na hydration ngwaahịa ndị dị otú ahụ dị ka C — S — H na Ca (OH) 2, na adịkarịghị adsorbed on clinker mbụ mineral. Ejikọtara ya na nyocha SEM nke usoro hydration ciment, a na-achọpụta na cellulose ether nwere mmetụta nkwụsịtụ ụfọdụ, na ọdịnaya nke cellulose ether dị elu karị, nke a na-apụta ìhè na mmetụta retarding nke oyi akwa ihe nkiri dị mgbagwoju anya na mmalite hydration nke ciment, ya mere, pụta ìhè mmetụta retarding.

2.4 ike mgbanwe na ike mkpakọ

N'ozuzu, ike bụ otu n'ime mkpa nlebanya index nke simenti dabeere na-agwọ mmetụta nke ngwakọta. Na mgbakwunye na arụmọrụ dị elu, ngwa agha na-ebuli onwe ya kwesịkwara inwe ụfọdụ ike mkpakọ na ike mgbanwe. N'ime ọmụmụ ihe a, a nwalere ike mkpakọ ụbọchị 7 na 28 na ike mgbanwe nke ngwa ngwa oghere agwara ya na cellulose ether.

Site na mmụba nke cellulose ether ọdịnaya, ngwa agha compressive ike na ike mgbanwe na-ebelata dị iche iche amplitude, ọdịnaya dị ntakịrị, mmetụta na ike na-apụtaghị ìhè, ma na ọdịnaya nke ihe karịrị 0.02%, ike ọnwụ ọnụego uto bụ ihe doro anya karị. , Ya mere, n'iji cellulose ether eme ihe iji meziwanye njigide mmiri mmiri, ma na-eburu n'uche mgbanwe nke ike.

Ihe na-ebute ngwa ngwa mkpakọ na ike mgbanwe na-adalata. Enwere ike nyochaa ya site na akụkụ ndị a. Nke mbụ, a naghị eji ciment ike mbụ na ike siri ike mee ihe n'ọmụmụ ihe. Mgbe a gwakọtara ngwa ngwa akọrọ na mmiri, ụfọdụ cellulose ether rubber powder particles na-ebu ụzọ gbasaa n'elu akụkụ ciment iji mepụta ihe nkiri latex, nke na-egbu oge hydration nke ciment ma belata ike mmalite nke ngwa ngwa matrix. Nke abuo, iji mee ka ebe a na-arụ ọrụ na-akwadebe ngwa agha na-ebuli onwe ya na saịtị ahụ, ihe atụ niile dị na ọmụmụ ihe ahụ adịghị eme mkpọtụ na usoro nkwadebe na ịkpụzi, ma dabere na nhazi onwe onye. N'ihi ọrụ njigide mmiri siri ike nke cellulose ether na ngwa agha, a na-ahapụ ọnụ ọgụgụ dị ukwuu nke pores na matrix mgbe ejiri ngwa agha sie ike. Mmụba nke porosity na ngwa agha bụkwa ihe dị mkpa maka mbelata nke mkpakọ na ike mgbanwe nke ngwa agha. Na mgbakwunye, mgbe agbakwunyere cellulose ether n'ime ngwa agha, ọdịnaya nke polymer na-agbanwe agbanwe na pores nke ngwa agha na-abawanye. Mgbe a na-agbanye matrix ahụ, polymer na-agbanwe agbanwe na-esiri ike ịrụ ọrụ nkwado siri ike, nke na-emetụtakwa arụmọrụ ike nke matriks ruo n'ókè ụfọdụ.

2.5 ike njikọ

Cellulose ether nwere mmetụta dị ukwuu na njikọta nke ngwa agha ma na-ejikarị eme nchọpụta na nkwadebe nke ngwa agha na-edozi onwe ya.

Mgbe ọdịnaya nke cellulose ether dị n'etiti 0.02% na 0.10%, a na-eme ka ike nke ngwa agha dịkwuo mma, na ike nkekọ na ụbọchị 28 dị elu karịa nke ahụ na ụbọchị 7. Cellulose ether na-emepụta ihe nkiri polymer mechiri emechi n'etiti cement hydration particles na usoro mmiri mmiri, nke na-akwalite mmiri karịa na ihe nkiri polymer n'èzí ciment ahụ, bụ nke na-eme ka hydration zuru oke nke ciment, ka ọ dịkwuo mma njikọ ike nke mado. mgbe hardening. N'otu oge ahụ, ego kwesịrị ekwesị nke cellulose ether na-eme ka plasticity na mgbanwe nke ngwa agha dịkwuo elu, na-ebelata ike nke mpaghara mgbanwe n'etiti ngwa agha na ihe ntanetị, na-ebelata nchekasị n'etiti interface ahụ, ma na-eme ka njikọ dị n'etiti ngwa agha na mkpụrụ osisi na. a ụfọdụ ogo. N'ihi ọnụnọ nke cellulose ether na ciment slurry, a na-emepụta mpaghara mgbanwe pụrụ iche na interfacial oyi akwa n'etiti ngwa ngwa na ngwaahịa hydration. Ihe mkpuchi ihu a na-eme ka mpaghara ntụgharị ihu dị n'ihu na-agbanwe ma ghara isi ike, nke mere na ngwa agha nwere ike njikọ siri ike.

3. Mmechi na Mkparịta ụka

Cellulose ether nwere ike melite njide mmiri nke ngwa agha na-ebuli onwe ya elu. Site na mmụba nke ọnụ ọgụgụ cellulose ether, a na-eji nwayọọ nwayọọ na-ejigide mmiri nke mmiri mmiri, na mmiri mmiri na oge nhazi na-ebelata ruo n'ókè ụfọdụ. Oke oke njide mmiri ga-abawanye porosity nke slurry siri ike, nke nwere ike ime ka ike mkpakọ na mgbanwe nke ngwa agha siri ike nwee mfu doro anya. N'ime ọmụmụ ihe ahụ, ike ahụ belatara nke ukwuu mgbe usoro onunu ogwu dị n'etiti 0.02% na 0.04%, na ọnụ ọgụgụ cellulose ether ka ukwuu, otú ahụ ka ọ na-apụta ìhè na mmetụta nkwụsịtụ. Ya mere, mgbe ị na-eji cellulose ether, ọ dịkwa mkpa ka a tụlee n'ụzọ zuru ezu n'ibu Njirimara nke onwe-leveling ngwa agha, ezi uche nhọrọ nke onunu ogwu na synergistic mmetụta n'etiti ya na ndị ọzọ chemical ihe.

Iji cellulose ether mee ihe nwere ike ibelata ike mkpakọ na ike mgbanwe nke ciment slurry, ma melite ike njikọ nke ngwa agha. Nyocha nke ihe kpatara mgbanwe nke ike, tumadi kpatara mgbanwe nke micro ngwaahịa na Ọdịdị, n'otu aka ahụ, cellulose ether roba ntụ ntụ mbụ adsorbed n'elu ciment ahụ, guzobe nke latex film, na-egbu oge hydration nke simenti, nke ga-eme ka mfu nke ike mmalite nke slurry; N'aka nke ọzọ, n'ihi ihe nkiri na-emepụta mmetụta na mmiri na-ejide mmiri, ọ na-eme ka hydration zuru oke nke ciment na nkwalite nke ike njikọ. Onye edemede ahụ kwenyere na ụdị mgbanwe ike abụọ a na-adị na njedebe nke oge nhazi, na n'ihu na igbu oge nke oke a nwere ike ịbụ isi ihe dị mkpa na-ebute oke nke ụdị ike abụọ ahụ. Ọmụmụ ihe omimi na usoro nhazi nke isi ihe a dị oke egwu ga-enyere aka ịhazi nhazi na nyocha nke usoro hydration nke ihe simenti na slurry. Ọ na-enye aka ịhazigharị ọnụ ọgụgụ nke cellulose ether na ọgwụgwọ oge dịka ọchịchọ nke ngwa ngwa ngwa ngwa si dị, iji mee ka arụmọrụ nke ngwa agha dịkwuo mma.