ʻO ka cellulose ether i hoʻololi ʻia i ka slurry sima

Ua aʻo ʻia ka hopena o nā ʻano molekala like ʻole o ka cellulose ether non-ionic ma ka ʻōnaehana pore o ka slurry sima ma o ka hoʻāʻo ʻana o ka hoʻokō a me ka nānā ʻana i ka ʻano macroscopic a me ka microscopic pore structure. Hōʻike nā hopena i hiki ke hoʻonui i ka porosity o ka slurry cement nonionic cellulose ether. Ke like ka viscosity o ka non-ionic cellulose ether slurry i hoʻololi ʻia, ʻo ka porosity ohydroxyethyl cellulose etherʻOi aku ka liʻiliʻi o ka slurry i hoʻololi ʻia ma mua o ka hydroxypropyl methyl cellulose ether (HPMC) a me ka methyl cellulose ether (MC) i hoʻololi ʻia slurry. ʻO ka haʻahaʻa o ka viscosity/relative molecular paona o HPMC cellulose ether me nā maʻiʻo hui like, ʻoi aku ka liʻiliʻi o ka porosity o kāna slurry sima i hoʻololi ʻia. Hiki i ka non-ionic cellulose ether ke hoʻemi i ka ʻili o ka ʻili o ka pae wai a hana i ka slurry sima maʻalahi e hana i nā ʻōpū. Non-ionic cellulose etera molekele i directionally adsorbed ma ke kinoea-wai interface o ka ohu, e hoʻonui i ka viscosity o ka sima slurry māhele a hoʻonui i ka hiki o ka sima slurry e stabilize i na ohu.

Hua'ōlelo nui:nonionic cellulose ether; slurry sima; Hoʻolālā pore; Hoʻolālā molekala; Kūleʻa o ka ʻili; viscosity

Nonionic cellulose etera (ma hope mai i kapa ʻia he cellulose ether) he ʻano mānoanoa maikaʻi a me ka paʻa ʻana o ka wai, a hoʻohana nui ʻia i loko o ka palaki maloʻo maloʻo, hoʻopaʻa paʻa ponoʻī a me nā mea hana sima hou. ʻO nā eter cellulose i hoʻohana ʻia i nā mea i hoʻokumu ʻia i ka sima, ʻo ia ka methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC), hydroxyethyl methyl cellulose ether (HEMC) a me ka hydroxyethyl cellulose ether (HEC), ma waena o HPMC a me HEMC nā noi maʻamau. .

Hiki i ka cellulose ether ke hoʻopilikia nui i ka hana pore o ka slurry sima. Pourchez et al., ma o ka ho'āʻo hoʻopaʻapaʻa ʻike, ka hoʻāʻo ʻana i ka nui o ka pore (mercury injection method) a me ka nānā ʻana i ke kiʻi sEM, ua manaʻo e hiki i ka cellulose ether ke hoʻonui i ka nui o nā pores me ke anawaena o 500nm a me nā pores me ke anawaena o 50-250μm i loko. slurry sima. Eia kekahi, no ka slurry sima paʻakikī, ʻO ka puʻunaue nui o ka pore o ka haʻahaʻa molekala kaumaha HEC i hoʻololi ʻia i ka slurry sima ua like ia me ka slurry sima maʻemaʻe. ʻOi aku ka kiʻekiʻe o ka nui o ka pore o ka slurry molekala kiʻekiʻe HEC i hoʻololi ʻia ma mua o ka slurry sima maʻemaʻe, akā ʻoi aku ka haʻahaʻa ma mua o ko HPMC slurry hoʻololi ʻia me ka like like. Ma o ka nānā ʻana SEM, Zhang et al. ua ʻike ʻo HEMC hiki ke hoʻonui nui i ka helu o nā pores me ke anawaena o kahi o 0.1mm i loko o ka pahu sima. Ua ʻike pū lākou ma o ka hoʻāʻo ʻana i ka mercury injection e hiki ai i ka HEMC ke hoʻonui nui i ka nui o ka pore a me ka awelika pore anawaena o ka sima slurry, ka hopena i ka piʻi nui ʻana o ka nui o nā pores nui me ke anawaena o 50nm ~ 1μm a me nā pores nui me ke anawaena o nā mea hou aku. ma mua o 1μm. Eia naʻe, ua emi loa ka helu o nā pores me ke anawaena ma lalo o 50nm. Saric-Coric et al. Ua manaʻoʻiʻo ʻo ka cellulose ether e hoʻonui i ka porous sima a alakaʻi i ka piʻi ʻana o nā macropores. Jenni et al. ua ho'āʻo i ka nui o ka hana a ua hoʻoholo ʻo ka hapa nui o ka pore o ka mortar sima i hoʻololi ʻia he 20%, ʻoiai he liʻiliʻi wale nō ka ea. Silva et al. ʻike ʻia ma ka hui ʻana i nā piko ʻelua ma 3.9 nm a me 40 ~ 75nm e like me ka slurry sima maʻemaʻe, aia nō ʻelua mau piko ma 100 ~ 500nm a ʻoi aku ka nui ma mua o 100μm ma o ka hoʻāʻo ʻana i ka mercury. Ma Baoguo et al. ua ʻike ʻia ua hoʻonui ʻia ka cellulose ether i ka helu o nā pores maikaʻi me nā diameters ma lalo o 1μm a me nā pores nui me nā diameters ʻoi aku ka nui ma mua o 2μm i ka mortar sima ma o ka hoʻāʻo ʻana i ka mercury injection. E like me ke kumu o ka cellulose etera hoʻonui i ka porosity o ka sima slurry, ka mea maʻamau i manaʻoʻiʻo i ka cellulose etera i ili hana, e waiwai i loko o ka lewa a me ka wai interface, e hana i kiʻiʻoniʻoni, i mea e stabilize i na bubbles i ka sima slurry.

Ma o ka loiloi palapala ma luna nei, hiki ke ʻike ʻia i ka hopena o ka cellulose ether ma ke ʻano pore o nā mea i hoʻokumu ʻia i ka sima. Eia nō naʻe, he nui nā ʻano cellulose ether, ʻo ia ʻano cellulose ether, kona kaumaha molekala pili, ʻike pūʻulu a me nā ʻāpana ʻāpana molekala ʻē aʻe he ʻokoʻa loa, a ʻo nā mea noiʻi kūloko a me nā haole e pili ana i ke koho cellulose ether i kaupalena ʻia i kā lākou noi. kahua, nele o ka hoike ana, inevitable ka hopena "overgeneralization", no laila, i ka wehewehe ana o cellulose ether mechanical 'aʻole hohonu lawa. I loko o kēia pepa, ua aʻo ʻia ka hopena o ka cellulose ether me nā ʻano molekala ʻokoʻa ma ke ʻano o ka pore o ka slurry sima ma o ka hoʻāʻo ʻana i ka density a me ka nānā ʻana i ke ʻano o ka pore macroscopic a me ka microscopic.

1. Hoao

1.1 Mea Maka

ʻO ka sima he P·O 42.5 maʻamau Portland ciment i hana ʻia e Huaxin Cement Co., LTD., kahi i ana ʻia ai ka haku mele e AXIOS Ad-Vanced wavelength dispersion-type X-ray fluorescence spectrometer (PANa — lytical, Netherlands), a ua manaʻo ʻia ka haku mele ma ke ʻano Bogue.

Ua koho ʻia ka cellulose etera i ʻehā ʻano o ka cellulose ether pāʻoihana, kēlā me kēia methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC1, HPMC2) a me hydroxyethyl cellulose ether (HEC), HPMC1 molecular structure a me HPMC2 like, akā ʻoi aku ka liʻiliʻi o ka viscosity ma mua o HPMC2 , 'O ia ho'i, 'oi aku ka li'ili'i o ka molekala pili o HPMC1 ma mua o ka HPMC2. Ma muli o nā waiwai like o hydroxyethyl methyl cellulose ether (HEMc) a me HPMC, ʻaʻole i koho ʻia nā HEMC i kēia haʻawina. No ka pale ʻana i ka hopena o ka makū ma nā hopena hoʻāʻo, ua kālua ʻia nā cellulose ether a pau ma 98 ℃ no 2h ma mua o ka hoʻohana ʻana.

Ua hoʻāʻo ʻia ka viscosity o cellulose ether e NDJ-1B rotary viscosimeter (Shanghai Changji Company). ʻO ka hoʻonā ʻana o ka hoʻāʻo ʻana (ka nui o ka cellulose ether i ka wai) he 2.0%, ʻo ka mahana he 20 ℃, a ʻo ka nui o ka rotation he 12r/min. Ua hoʻāʻo ʻia ka ʻili o ka cellulose ether e ke ʻano apo. ʻO ka mea hoʻāʻo ʻo JK99A tensiometer aunoa (Shanghai Zhongchen Company). ʻO 0.01% ka manaʻo o ka hopena hoʻāʻo a ʻo ka mahana he 20 ℃. Hāʻawi ʻia ka ʻike o ka hui cellulose ether e ka mea hana.

E like me ka viscosity, ka ʻili o ka ʻili a me ka hui pūʻulu o ka cellulose ether, i ka wā o ka hoʻonā ʻana he 2.0%, ʻo ka viscosity ratio o HEC a me HPMC2 solution he 1:1.6, a ʻo ka viscosity ratio o HEC a me MC solution he 1: 0.4, akā. i kēia ho'āʻo, ka wai-kima lākiō he 0.35, ka nui o ka sima lākiō he 0.6%, ka nuipa o ka cellulose etera i ka wai ma kahi o 1.7%, emi ma lalo o 2.0%, a me ka synergistic hopena o ka sima slurry ma viscosity, pela ka liʻiliʻi ka ʻokoʻa viscosity o HEC, HPMC2 a i ʻole MC.

E like me ka viscosity, ka ʻili o ka ʻili a me ka ʻike pūʻulu o ka cellulose ether, ʻokoʻa ka ʻili o kēlā me kēia cellulose ether. Loaʻa i ka cellulose ether nā pūʻulu hydrophilic (hydroxyl a me nā pūʻulu ether) a me nā pūʻulu hydrophobic (methyl a me glucose carbon ring), he surfactant. He ʻokoʻa ka cellulose ether, ʻokoʻa ke ʻano a me ka ʻike o nā pūʻulu hydrophilic a me hydrophobic, e hopena i ka ʻokoʻa o ka ʻili.

1.2 Nā ʻano hoʻāʻo

ʻEono ʻano o ka sima slurry i hoʻomākaukau ʻia, me ka slurry sima maʻemaʻe, ʻehā cellulose ether (MC, HPMCl, HPMC2 a me HEC) slurry ciment i hoʻololi ʻia me 0.60% lākiō sima a me ka slurry sima hoʻololi HPMC2 me 0.05% lākiō sima. Ref, MC — 0.60, HPMCl — 0.60, Hpmc2-0.60. Hōʻike ka HEC 1-0.60 a me ka hpMC2-0.05 he 0.35 ka ratio wai-sima.

ʻO ka slurry sima mua e like me GB / T 17671 1999 "ʻano hoʻāʻo ikaika mortar ciment (ISO method)" i hana ʻia i 40mm × 40mm × 160mm prisms hoʻāʻo poloka, ma lalo o ke kūlana o 20 ℃ i hoʻopaʻa ʻia i ka curing 28d. Ma hope o ke kaupaona ʻana a me ka helu ʻana i kona ʻano mānoanoa, ua haki ʻia me ka hāmare liʻiliʻi, a ʻike ʻia ke kūlana puka macro o ka ʻāpana waena o ka poloka hoʻāʻo a paʻi ʻia me ke kiʻi paʻi kiʻi. I ka manawa like, ua lawe ʻia nā ʻāpana liʻiliʻi o 2.5 ~ 5.0mm no ka nānā ʻana e ka microscope optical (HIROX ʻekolu-dimensional video microscope) a me ka scanning electron microscope (JSM-5610LV).

2. Nā hopena hoʻāʻo

2.1 ʻIke ʻia ka mānoanoa

Ma muli o ka mānoanoa o ka slurry sima i hoʻololi ʻia e nā etera cellulose ʻokoʻa, (1) ʻo ke kiʻekiʻe loa o ka slurry sima maʻemaʻe, ʻo ia ka 2044 kg/m³; ʻO ka mānoanoa o nā ʻano ʻehā cellulose etera i hoʻololi ʻia me ka lākiō sima o 0.60% ʻo 74% ~ 88% o ka slurry sima maʻemaʻe, e hōʻike ana i ka cellulose ether i hoʻonui i ka porosity o ka slurry sima. (2) Inā he 0.60% ka lakio o ka sima a me ka sima, ʻokoʻa loa ka hopena o nā cellulose ethers ma ka porosity o ka slurry sima. Ua like ka viscosity o HEC, HPMC2 a me MC i hoʻololi ʻia cement slurry, akā ʻo ka ʻike nui o ka slurry cement hoʻololi ʻia ʻo HEC ka mea kiʻekiʻe loa, e hōʻike ana he liʻiliʻi ka porosity o HEC modified cement slurry ma mua o ka HPMc2 a me Mc modified cement slurry me ka viscosity like. . HPMc1 a me HPMC2 i like pūʻulu maʻiʻo, akā, i ka viscosity o HPMCl ua oi loa haʻahaʻa ma mua o ka HPMC2, a me ka ike maopopo o ka HPMCl hoʻololi sima slurry ua nui kiʻekiʻe ma mua o ka HPMC2 hoʻololi sima slurry, e hōʻike ana i ka wā o ka hui maʻiʻo like. , ʻo ka haʻahaʻa o ka viscosity o cellulose ether, ʻo ka haʻahaʻa o ka porosity o ka slurry sima i hoʻololi ʻia. (3) Ke liʻiliʻi loa ka lākiō sima-a-cement (0.05%), ʻo ka mānoanoa o ka HPMC2-modified cement slurry ua kokoke kokoke i ka slurry sima maʻemaʻe, e hōʻike ana i ka hopena o ka cellulose ether ma ka porosity o ka sima. liʻiliʻi loa ka slurry.

2.2 Pore Macroscopic

E like me ka pauku kiʻi o cellulose etera hoʻololi sima slurry i laweʻia e kikohoʻe kikohoʻe slurry maʻemaʻe sima slurry ua oi loa aku, aneane ike ole pores; ʻO nā ʻano ʻehā o ka slurry cellulose etera i hoʻololi ʻia me ka 0.60% ciment ratio he ʻoi aku ka nui o nā pores macroscopic, e hōʻike ana i ka cellulose etera ke alakaʻi i ka piʻi ʻana o ka cement slurry porosity. E like me nā hopena o ka hoʻāʻo ʻana i ka density, ʻokoʻa ka hopena o nā ʻano cellulose ether a me nā mea i loko o ka porosity o ka slurry cement. Ua like ka viscosity o HEC, HPMC2 a me MC slurry i hoʻololi ʻia, akā ʻoi aku ka liʻiliʻi o ka porosity o HEC slurry hoʻololi ʻia ma mua o ka HPMC2 a me ka MC hoʻololi slurry. ʻOiai ʻo HPMC1 a me HPMC2 he ʻike pūʻulu like, HPMC1 hoʻololi i ka slurry me ka viscosity haʻahaʻa he liʻiliʻi ka porosity. Ke liʻiliʻi loa (0.05%) ka lakio ciment-to-cement o ka slurry hoʻololi ʻia ʻo HPMc2, ua hoʻonui iki ʻia ka helu o nā pores macroscopic ma mua o ka slurry sima maʻemaʻe, akā hoʻemi nui ʻia ma mua o ka slurry hoʻololi HPMC2 me 0.60% cement-to -lākiō sima.

2.3 Pore liʻiliʻi

4. Ka hopena

(1) Hiki i ka cellulose ether ke hoʻonui i ka porosity o ka slurry sima.

(2) ʻOkoʻa ka hopena o ka cellulose ether ma ka porosity o ka slurry cement me nā ʻokoʻa molecular structure parameters: inā like ka viscosity o cellulose ether modified cement slurry, ʻoi aku ka liʻiliʻi o ka porosity o HEC modified cement slurry ma mua o ka HPMC a me MC hoʻololi. slurry sima; ʻO ka haʻahaʻa o ka viscosity/relative molecular weight o HPMC cellulose ether me nā maʻiʻo hui like, ʻo ka haʻahaʻa o ka porosity o kāna slurry sima i hoʻololi ʻia.

(3) Ma hope o ka hoʻohui ʻana i ka cellulose ether i loko o ka slurry sima, ua hoʻemi ʻia ka ʻili o ka pae wai, no laila e maʻalahi ka slurry sima e hana i nā ʻōpū i cellulose ether molekole directional adsorption i loko o ka bula kinoea-wai interface, hoʻomaikaʻi i ka ikaika a me ka paʻakikī o ka. ʻO ka adsorption kiʻiʻoniʻoni wai wai i loko o ka pānaʻi kinoea-wai, e hoʻomaikaʻi i ka ikaika o ka kiʻiʻoniʻoni wai a hoʻoikaika i ka hiki o ka lepo paʻakikī e hoʻopaʻa i ka ʻōpala.