1. Ka wela o ka hydration
E like me ka hoʻokuʻu ʻana o ka wela o ka hydration i ka manawa, ua māhele ʻia ke kaʻina hana hydration o ka sima i ʻelima mau ʻanuʻu, ʻo ia hoʻi, ka manawa hydration mua (0 ~ 15min), ka manawa induction (15min ~ 4h), ka wikiwiki a me ka manawa hoʻonohonoho (4h ~ 8h ), deceleration a me ka wā paʻakikī (8h ~ 28h), a me ka curing.
Hōʻike nā hopena hoʻāʻo i ka hoʻomaka ʻana o ka induction (ʻo ia hoʻi, ka manawa hydration mua), ke 0.1% ka nui o ka HEMC i hoʻohālikelike ʻia me ka slurry cement blank, ua holomua kahi kiʻekiʻe exothermic o ka slurry a hoʻonui nui ʻia ka piko. I ka manawa o ka nui oHEMCpiʻi aʻe i ka wā ma luna o 0.3%, ua hoʻopaneʻe ka piko exothermic mua o ka slurry, a e emi mālie ke kiʻekiʻe me ka piʻi ʻana o ka HEMC maʻiʻo; E hoʻopaneʻe ʻo HEMC i ka manawa induction a me ka manawa wikiwiki o ka slurry cement, a ʻoi aku ka nui o ka ʻike, ʻoi aku ka lōʻihi o ka manawa induction, ʻoi aku ka hope o ka manawa wikiwiki, a ʻoi aku ka liʻiliʻi o ka exothermic peak; ʻAʻohe hopena maopopo o ka hoʻololi ʻana o ka cellulose ether ma ka lōʻihi o ka manawa deceleration a me ka manawa paʻa o ka slurry sima, e like me ka hōʻike ʻana ma ke Kiʻi 3 (a) Ua hōʻike ʻia e hiki i ka cellulose ether ke hoʻemi i ka wela o ka hydration o ka paʻi sima i loko o 72 mau hola, akā inā lōʻihi ka wela o ka hydration ma mua o 36 mau hola, ʻoi aku ka liʻiliʻi o ka hopena o ka cellulose eter. paʻi, e like me ke Kiʻi 3(b).
Fig.3 ʻano ʻano like ʻole o ka hoʻokuʻu ʻana i ka wela hydration o ka paʻi sima me nā mea like ʻole o ka cellulose ether (HEMC)
2. Mwaiwai echanical：
Ma ke aʻo ʻana i ʻelua ʻano cellulose ethers me nā viscosities o 60000Pa·s a me 100000Pa·s, ua ʻike ʻia ua emi mālie ka ikaika compressive o ka mortar i hoʻololi ʻia i hui pū ʻia me ka methyl cellulose ether me ka hoʻonui ʻana o kona ʻike. ʻO ka ikaika compressive o ka mortar i hoʻololiʻia i hui pūʻia me 100000Pa·s viscosity hydroxypropyl methyl cellulose ether e hoʻonui mua a laila e emi iho me ka hoʻonuiʻana o kona mau mea (e like me ka hōʻikeʻana i ka Figure 4). Hōʻike ia i ka hoʻohui ʻia ʻana o ka methyl cellulose ether e hoʻemi nui i ka ikaika compressive o ka mīkini sima. ʻO ka nui o ka nui, ʻoi aku ka liʻiliʻi o ka ikaika; ʻo ka liʻiliʻi o ka viscosity, ʻoi aku ka nui o ka hopena i ka nalowale o ka ikaika compressive mortar; hydroxypropyl methyl cellulose ether I ka emi ʻana o ka dosage ma lalo o 0.1%, hiki ke hoʻonui ʻia ka ikaika compressive o ka mortar. Ke ʻoi aku ka nui o ka dosage ma mua o 0.1%, e emi ana ka ikaika compressive o ka mortar me ka hoʻonui ʻana o ka dosage, no laila e hoʻokele ʻia ka dosage ma 0.1%.
Fig.4 3d, 7d a me 28d ikaika compressive o MC1, MC2 a me MC3 i hoʻololi ʻia i ka pahu sima.
(Methyl cellulose ether, viscosity 60000Pa·S, ma hope aku i kapa ʻia ʻo MC1; methyl cellulose ether, viscosity 100000Pa·S, i kapa ʻia ʻo MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, i kapa ʻia ʻo MC3).
3. Cmanawa hailona：
Ma ke ana ʻana i ka manawa hoʻonohonoho o ka hydroxypropyl methylcellulose ether me ka viscosity o 100000Pa·s i nā ʻano like ʻole o ka paʻi sima, ua ʻike ʻia me ka hoʻonui ʻana o ka helu HPMC, ua hoʻolōʻihi ʻia ka manawa hoʻonohonoho mua a me ka manawa hoʻonohonoho hope o ka mortar sima. Ke 1% ka hoʻonohonoho ʻana, hiki i ka manawa hoʻonohonoho mua i 510 mau minuke, a hiki i ka manawa hoʻonohonoho hope i 850 mau minuke. Ke hoʻohālikelike ʻia me ka hāpana hakahaka, hoʻonui ʻia ka manawa hoʻonohonoho mua e 210 mau minuke, a hoʻonui ʻia ka manawa hoʻonohonoho hope e 470 mau minuke (e like me ka hōʻike ʻana ma ke Kiʻi 5). ʻO ka HPMC paha me ka viscosity o 50000Pa s, 100000Pa s a i ʻole 200000Pa s, hiki iā ia ke hoʻopaneʻe i ka hoʻonohonoho ʻana o ka sima, akā ke hoʻohālikelike ʻia me nā etera cellulose ʻekolu, ua hoʻolōʻihi ʻia ka manawa hoʻonohonoho mua a me ka manawa hoʻonohonoho hope me ka piʻi ʻana o ka viscosity, e like me ka hōʻike ʻana ma ke Kiʻi 6. ʻO kēia ke kumu no ka hoʻopili ʻia ʻana o ka cellulose ether ma ka ʻili o nā ʻāpana sima, ka mea e pale ai i ka wai mai ka hoʻopili ʻana me nā ʻāpana sima, no laila e hoʻopaneʻe i ka hydration o ka sima. ʻO ka ʻoi aku ka nui o ka viscosity o cellulose ether, ʻoi aku ka mānoanoa o ka papa adsorption ma ka ʻili o nā ʻāpana sima, a ʻoi aku ka nui o ka hopena lohi.
Fig.5 Ka hopena o ka maʻiʻo cellulose ether i ka hoʻonohonoho ʻana i ka manawa o ka mortar
Fig.6 Ka hopena o nā viscosity like ʻole o ka HPMC i ka manawa hoʻonohonoho o ka paʻi sima
(MC-5(50000Pa·s), MC-10(100000Pa·s) a me MC-20(200000Pa·s))
ʻO ka methyl cellulose etera a me ka hydroxypropyl methyl cellulose etera e hoʻolōʻihi i ka manawa hoʻonohonoho o ka slurry sima, hiki ke hōʻoia i ka slurry sima i lawa ka manawa a me ka wai no ka hydration reaction, a hoʻoponopono i ka pilikia o ka ikaika haʻahaʻa a me ka manawa hope o ka slurry sima ma hope o ka paʻakikī. pilikia māhā.
4. Paʻa wai:
Ua aʻo ʻia ka hopena o ka cellulose ether ma ka mālama ʻana i ka wai. Ua ʻike ʻia me ka piʻi ʻana o ka maʻiʻo o ka cellulose ether, piʻi ka nui o ka paʻa ʻana o ka wai o ka mortar, a ke ʻoi aku ka nui o ka cellulose ether ma mua o 0.6%, ʻoi aku ka paʻa o ka wai paʻa. Eia naʻe, i ka hoʻohālikelike ʻana i ʻekolu ʻano cellulose ethers (HPMC me ka viscosity o 50000Pa s (MC-5), 100000Pa s (MC-10) a me 200000Pa s (MC-20)), ʻokoʻa ka mana o ka viscosity i ka mālama ʻana i ka wai. ʻO ka pilina ma waena o ka nui o ka mālama ʻana i ka wai: MC-5.
Ka manawa hoʻouna: Apr-28-2024