ʻO ka gypsum desulfurization ke kinoea i hana ʻia e ka puhi ʻana i nā wahie i loko o ka sulfur (lānahu, petroleum), nā ʻōpala paʻa ʻoihana i hana ʻia i ka wā o ka hoʻomaʻemaʻe desulfurization, a me ka hemihydrate gypsum (chemical formula CaSO4· 0.5H2O), ua like ka hana me kēlā. o gypsum hale maoli.No laila, ʻoi aku ka nui o nā noiʻi a me nā noi o ka hoʻohana ʻana i ka gypsum desulfurized ma kahi o ka gypsum kūlohelohe e hana i nā mea hoʻohālikelike ponoʻī.ʻO nā mea hoʻohui polymer organik e like me ka mea hoʻemi wai, ka mea mālama wai a me ka retarder nā mea hana pono i ka hoʻohui ʻana i nā mea mortar hoʻohālikelike ponoʻī.ʻO ka pilina a me ka mīkini o nā mea ʻelua me nā mea cementitious he mau pilikia e pono ai ka nānā ʻana.Ma muli o nā hiʻohiʻona o ke kaʻina hana, he liʻiliʻi ka liʻiliʻi o ka desulfurized gypsum (ʻo ka nui o ka nui o ka nui ma waena o 40 a me 60 μm), a ʻaʻole kūpono ka hoʻoheheʻe ʻana o ka pauka, no laila ʻilihune nā waiwai rheological o ka gypsum desulfurized, a me ka mortar. ʻO ka slurry i hoʻomākaukau ʻia e ʻoi aku ka maʻalahi o ka Segregation, stratification a me ke kahe koko.ʻO ka cellulose ether ka mea hoʻohui maʻamau i hoʻohana ʻia i loko o ka mortar, a ʻo kāna hoʻohana ʻana me ka wai hoʻēmi wai he mea hōʻoia nui e hoʻomaopopo i ka hana piha o nā mea hoʻonaninani ponoʻī desulfurized gypsum e like me ke kūkulu ʻana i ka hana a me ka hana mechanical a me ka lōʻihi.
I loko o kēia pepa, hoʻohana ʻia ka waiwai fluidity e like me ka papa kuhikuhi (ka hoʻolaha ʻana o 145 mm ± 5 mm), e kālele ana i ka hopena o ka maʻiʻo o ka cellulose ether a me ke kaumaha mole (viscosity value) i ka hoʻohana ʻana i ka wai o ka desulfurized gypsum-based self. -ʻo nā mea pae, ka nalowale o ka wai i ka manawa, a me ka coagulation ʻO ke kānāwai o ka mana o nā waiwai kumu e like me ka manawa a me nā waiwai mechanical mua;i ka manawa like, e ho'āʻo i ke kānāwai o ka mana o ka cellulose etera ma ka wela hoʻokuʻu a me ka wela hoʻokuʻu rate o desulfurized gypsum hydration, e kālailai i kona mana ma ka hydration kaʻina o desulfurized gypsum, a mua kūkākūkā i kēia 'ano o admixture Compatibility me desulfurization gypsum gelling nenoaiu. .
1. Nā mea maka a me nā ʻano hoʻāʻo
1.1 Mea maka
ʻO ka pauka Gypsum: ʻO ka pauka gypsum desulfurized i hana ʻia e kahi hui ma Tangshan, ʻo ka hui mineral nui he hemihydrate gypsum, hōʻike ʻia kona ʻano kemika ma ka Papa 1, a ua hōʻike ʻia kona mau waiwai kino ma ka Papa 2.
kiʻi
kiʻi
ʻO nā mea hui pū kekahi: cellulose ether (hydroxypropyl methylcellulose, HPMC no ka pōkole);superplasticizer WR;defoamer B-1;EVA redispersible latex pauda S-05, loaʻa ia mau mea a pau ma ke kālepa.
Hui: ke one kahawai maoli, ke one maikai i hana pono ia ma ka sieve 0.6 mm.
1.2 Hana ho'āʻo
Hoʻopaʻa desulfurization gypsum: one: wai = 1: 0.5: 0.45, ka nui kūpono o nā mea hoʻohui ʻē aʻe, ka wai e like me ka papa kuhikuhi (ka hoʻonui 145 mm ± 5 mm), ma ka hoʻoponopono ʻana i ka inu wai, i hui pū ʻia me nā mea cementitious (desulfurization gypsum + Cement. ) 0, 0.5‰, 1.0‰, 2.0‰, 3.0‰ cellulose ether (HPMC-20,000);e hoʻoponopono hou i ke ʻano o ka cellulose etera i ka 1‰, e koho iā HPMC-20,000, HPMC-40,000, HPMC-75,000, a me HPMC-100,000 hydroxypropyl methylcellulose ethers me nā kaupaona molekala like ʻole (ʻo nā helu like ʻo H2, H4, H7.5, a me H7.5. ), e aʻo i ka dosage a me ka molecular kaumaha (viscosity value) o cellulose ether Ka hopena o nā hoʻololi i nā waiwai o ka gypsum-based self-leveling mortar, a me ka mana o nā mea ʻelua i ka wai, hoʻonohonoho manawa a me nā waiwai mechanical mua o Kūkākūkā ʻia ka hui ʻana o ka gypsum self-leveling mortar desulfurized.Hoʻokō ʻia ke ʻano hoʻokolohua kikoʻī e like me nā koi o GB / T 17669.3-1999 "Ka Hoʻoholo ʻana i nā Mechanical Properties of Building Gypsum".
Hoʻokō ʻia ka wela o ka hoʻāʻo hydration me ka hoʻohana ʻana i kahi hāpana hakahaka o ka gypsum desulfurized a me nā laʻana me ka cellulose ether maʻiʻo o 0.5‰ a me 3‰, kēlā me kēia, a ʻo ka mea hana i hoʻohana ʻia he TA-AIR ʻano wela o ka hydration tester.
2. Nā hualoaʻa a me ka nānā ʻana
2.1 Ka hopena o ka maʻiʻo cellulose ether i nā waiwai kumu o ka mortar
Me ka hoʻonui ʻana o ka ʻike, ʻoi aku ka maikaʻi o ka hana a me ka cohesion o ka mortar, ua hoʻemi nui ʻia ka nalowale o ka wai i ka manawa, a ʻoi aku ka maikaʻi o ka hana hana, a ʻaʻohe mea delamination o ka mortar paʻakikī, a me ka maʻalahi o ka ʻili. Ua hoʻomaikaʻi maikaʻi ʻia ka maʻalahi a me ka Aesthetics.I ka manawa like, ua hoʻonui nui ʻia ka hoʻohana ʻana i ka wai o ka mortar e hoʻokō i ka wai like.Ma 5‰, ua hoʻonui ʻia ka hoʻohana ʻana i ka wai e 102%, a ua hoʻolōʻihi ʻia ka manawa hoʻonohonoho hope e 100 min, ʻo ia ka 2.5 mau manawa o ka hāpana hakahaka.Ua emi nui nā waiwai mechanical mua o ka mortar me ka hoʻonui ʻia o ka ʻike o ka cellulose ether.Ke 5‰ ka maʻiʻo o ka cellulose ether, ua emi ka 24 h flexural ikaika a me ka ikaika compressive i 18.75% a me 11.29% o ka hāpana hakahaka.ʻO ka ikaika compressive he 39.47% a me 23.45% o ka hāpana hakahaka.He mea pono e hoʻomaopopo i ka piʻi ʻana o ka nui o ka mea mālama i ka wai, ua emi nui ka nui o ka mortar, mai 2069 kg / m3 ma 0 a 1747 kg / m3 ma 5‰, he emi o 15.56%.Ke emi nei ka nui o ka mortar a me ka piʻi ʻana o ka porosity, ʻo ia kekahi o nā kumu o ka emi ʻana o nā ʻano mechanical o ka mortar.
ʻO ka cellulose ether kahi polymer non-ionic.Hiki i nā pūʻulu hydroxyl ma ke kaulahao cellulose ether a me nā ʻātoma oxygen ma ka paʻa eter ke hui pū me nā molekele wai e hana i nā paʻa hydrogen, e hoʻohuli i ka wai manuahi i wai paʻa, a laila e pāʻani ai i ka mālama ʻana i ka wai.Macroscopically Hōʻike ʻia ma ke ʻano he hoʻonui i ka cohesiveness o ka slurry [5].ʻO ka hoʻonui ʻana i ka viscosity slurry ʻaʻole e hoʻonui wale i ka hoʻohana ʻana i ka wai, akā e hoʻopili ʻia ka cellulose ether i hoʻoheheʻe ʻia ma ka ʻili o nā ʻāpana gypsum, e pale ana i ka hopena hydration a hoʻolōʻihi i ka manawa hoʻonohonoho;i ka wā o ka hoʻoulu ʻana, e hoʻokomo pū ʻia ka nui o nā ʻōpū o ka ea.E hoʻokumu ʻia nā haʻahaʻa i ka wā e paʻa ai ka mortar, a laila e hoʻemi i ka ikaika o ka mortar.Ke noʻonoʻo nei i ka hoʻohana ʻana i ka wai unilateral o ka hui ʻana i ka momi, ka hana hana, ka hoʻonohonoho ʻana i ka manawa a me nā waiwai mechanical, a me ka lōʻihi ma hope, a me nā mea ʻē aʻe, ʻaʻole pono ka ʻike o ka cellulose ether i ka desulfurized gypsum-based self-leveling mortar ma mua o 1‰.
2.2 Ka hopena o ke kaumaha mole o ka cellulose ether ma ka hana o ka mortar
ʻO ka maʻamau, ʻoi aku ka kiʻekiʻe o ka viscosity a me ka ʻoi aku ka maikaʻi o ka cellulose ether, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai a hoʻonui i ka ikaika paʻa.e hoʻopilikia maikaʻi ʻia ka hana.No laila, ua hoʻāʻo hou ʻia ka mana o ka cellulose ethers o nā kaupaona molekala like ʻole i nā waiwai kumu o ka gypsum-based self-leveling mortar.Ua piʻi aʻe ka makemake wai o ka mortar i kekahi ʻano, akā ʻaʻohe hopena maopopo i ka manawa hoʻonohonoho a me ka wai.I ka manawa like, ua hōʻike ʻia ka hoʻohaʻahaʻa ʻana o ka flexural a me ka ikaika compressive o ka mortar ma nā mokuʻāina like ʻole, akā ʻoi aku ka liʻiliʻi o ka emi ʻana ma mua o ka mana o ka cellulose ether content ma nā waiwai mechanical.I ka hōʻuluʻulu ʻana, ʻaʻohe hopena ʻike ʻia o ka hoʻonui ʻana i ke kaumaha molekala o cellulose ether i ka hana ʻana o ka hui ʻana o ka moa.E noʻonoʻo i ka ʻoluʻolu o ke kūkulu ʻana, pono ke koho ʻia ka liʻiliʻi liʻiliʻi-viscosity a me ka cellulose ether liʻiliʻi e like me ka desulfurized gypsum-based self-leveling material.
2.3 Ka hopena o ka cellulose ether ma ka wela o ka hydration o ka gypsum desulfurized
Me ka hoʻonui ʻana o ka ʻike o ka cellulose ether, ua emi iki ka exothermic peak o ka hydration o ka desulfurized gypsum, a ua hoʻopaneʻe iki ka manawa o ke kūlana kiʻekiʻe, ʻoiai ua emi ka wela exothermic o ka hydration, akā ʻaʻole maopopo.Hōʻike kēia i hiki i ka cellulose ether ke hoʻopaneʻe i ka hydration rate a me ka hydration degree o ka gypsum desulfurized i kekahi ʻano, no laila ʻaʻole nui ka nui, a pono e mālama ʻia i loko o 1‰.Hiki ke ʻike ʻia ke kiʻi colloidal i hana ʻia ma hope o ka hui ʻana o cellulose ether me ka wai i adsorbed ma ka ʻili o nā ʻāpana gypsum desulfurized, kahi e hoʻemi ai i ka hydration rate o gypsum ma mua o 2 h.I ka manawa like, ʻo kona hoʻopaʻa ʻana i ka wai kūʻokoʻa a me nā hopena mānoanoa e hoʻopaneʻe i ka hoʻoheheʻe ʻana o ka wai slurry a ʻo ka Dissipation ka mea e pono ai ka hydration hou o ka gypsum desulfurized i ka pae hope.I ka hōʻuluʻulu ʻana, i ka wā e hoʻomalu ʻia ai ke ʻano kūpono, ua liʻiliʻi ka hopena o ka cellulose ether i ka hydration rate a me ka hydration degree o ka desulfurized gypsum ponoʻī.I ka manawa like, ʻo ka hoʻonui ʻana o ka cellulose ether content a me ke kaumaha molekala e hoʻonui nui i ka viscosity o ka slurry a hōʻike i ka hana paʻa wai maikaʻi loa.I mea e hōʻoiaʻiʻo ai i ka wai o ka desulfurized gypsum self-leveling mortar, e hoʻonui nui ʻia ka hoʻohana ʻana i ka wai, ʻo ia ke kumu o ka manawa hoʻonohonoho lōʻihi o ka mortar.ʻO ke kumu nui o ka emi ʻana o nā waiwai mechanical.
3. Ka hopena
(1) Ke hoʻohana ʻia ka fluidity e like me ka papa kuhikuhi mana, me ka hoʻonui ʻana o ka cellulose ether content, ʻo ka manawa hoʻonohonoho o ka desulfurized gypsum-based self-leveling mortar e hoʻolōʻihi ʻia, a ua hoʻemi nui ʻia nā waiwai mechanical;i hoʻohālikelike ʻia me ka ʻike, ke kaumaha molekala o cellulose ether ʻAʻole liʻiliʻi ka hopena o ka hoʻonui ʻana i nā waiwai o luna o ka mortar.E noʻonoʻo ana i ka laulā, pono e koho ʻia ka cellulose ether me kahi paona molekala liʻiliʻi (ka waiwai viscosity ma lalo o 20 000 Pa · s), a pono e hoʻomalu ʻia ke ʻano i loko o 1‰ o ka mea cementitious.
(2) Hōʻike nā hopena hōʻike o ka wela hydration o ka gypsum desulfurized i loko o ke ʻano o kēia hoʻāʻo, cellulose ether ka palena palena o ka hydration rate a me ka hydration kaʻina o ka desulfurized gypsum.ʻO ka hoʻonui ʻana i ka inu wai a me ka emi ʻana o ka puʻupuʻu puʻupuʻu ke kumu nui o ka emi ʻana o nā waiwai mechanical o ka desulfurized gypsum-based mortar.
Ka manawa hoʻouna: Mei-08-2023