Mmetụta nke cellulose ether na rọba nbibi nke ngwa agha efu

Mmetụta nke cellulose ether na rọba nbibi nke ngwa agha efu

A na-eji ihe mmetụta mgbapụ laser na-abụghị kọntaktị na-anwale n'ihu plastik free shrinkage nke HPMC gbanwetụrụ ngwa ngwa ciment n'okpuru ọnọdụ ngwa ngwa, a na-ahụkwa ọnụego mmiri na-efunahụ ya n'otu oge ahụ. E hiwere ọdịnaya HPMC yana ụdị mbelata n'efu na mmiri na-efu mmiri n'otu n'otu. Nsonaazụ na-egosi na ngwa ngwa ciment na-enweghị plastik na-ebelata n'ụzọ ziri ezi site na mmụba nke ọdịnaya HPMC, yana enwere ike ibelata plastik free shrinkage nke simenti ngwa ngwa site na 30%-50% na mgbakwunye nke 0.1% -0.4% (oke irighiri) HPMC. Site na mmụba nke ọdịnaya HPMC, ọnụ ọgụgụ mmiri simenti na-efunahụ ngwa ngwa na-agbadakwa n'ahịrị. Enwere ike ibelata ọnụego mmiri simenti site na 9% ~ 29% yana mgbakwunye 0.1% ~ 0.4% HPMC. Ọdịnaya nke HPMC nwere mmekọrịta kwụ ọtọ doro anya yana mbelata n'efu na ọnụ ahịa mfu mmiri. HPMC na-ebelata mbelata rọba nke ngwa ngwa ciment n'ihi njide mmiri ya dị mma.

Isi okwu:methyl hydroxypropyl cellulose ether (HPMC); Ngwa ngwa; Plastic free shrinkage; Ọnụego mfu mmiri; Ụdị nlọghachi azụ

E jiri ya tụnyere simenti kọmpụta, ngwa ngwa ciment na-agbawa ngwa ngwa. Na mgbakwunye na ihe nke akụrụngwa n'onwe ha, mgbanwe nke okpomọkụ dị n'èzí na iru mmiri ga-eme ka mmiri simenti na-efunahụ ngwa ngwa, na-ebute mgbawa ngwa ngwa. Iji dozie nsogbu nke ciment mortar cracking, a na-edozikarị ya site n'ịkwalite ọgwụgwọ n'oge, na-eji ihe mgbasawanye na ịgbakwunye eriri.

Dị ka a polymer admixture nke a na-ejikarị na simenti simenti azụmahịa, cellulose ether bụ cellulose mmepụta nke enwetara site mmeghachi omume nke cellulose osisi na caustic soda. Zhan Zhenfeng et al. gosiri na mgbe ọdịnaya nke cellulose ether (ọnụego uka) bụ 0% ~ 0.4%, ọnụ ọgụgụ njide mmiri nke ciment mortar nwere ezigbo njikọ linear na ọdịnaya nke cellulose ether, na elu ọdịnaya nke cellulose ether, nke ukwuu. ọnụego njide mmiri. A na-eji Methyl hydroxypropyl cellulose ether (HPMC) mee ihe na ciment mortar iji meziwanye ịdị n'otu na ịdị n'otu n'ihi njikọ ya, nkwụsi ike nkwusioru na njide mmiri.

Akwụkwọ a na-ewe plastic free shrinkage nke ciment ngwa dị ka ihe ule, na-enyocha mmetụta HPMC na plastic free shrinkage nke ciment ngwa agha, na-enyocha ihe mere HPMC na-ebelata plastic free shrinkage nke ciment ngwa agha.

1. Ngwa ngwa na ụzọ ule

1.1 Akụrụngwa

Simenti ejiri mee ule ahụ bụ conch brand 42.5R nkịtị Portland ciment nke Anhui Conch Cement Co., LTD mepụtara. Ebe elu ya akọwapụtara bụ 398.1 m² / kg, 80μm sieve residue bụ 0.2% (irighiri oke); A na-enye HPMC site na Shanghai Shangnan Trading Co., LTD. Viscosity ya bụ 40 000 mPa·s, ájá bụ aja aja na-acha odo odo na-acha odo odo, ịdị mma nke ịdị mma bụ 2.59, na oke nha nha bụ 5mm.

1.2 Ụzọ nnwale

1.2.1 Usoro ule nbibi nke plastik n'efu

A nwalere mbelata plastik na-enweghị ihe mgbochi nke simenti site na ngwaọrụ nnwale nke akọwara n'akwụkwọ. Oke simenti na aja nke ngwa ngwa benchmark bụ 1: 2 (oke oke), na oke mmiri na ciment bụ 0.5 (oke oke). Tulee ihe ndị ahụ dị ka ngwakọta ngwakọta si dị, ma n'otu oge ahụ tinye n'ime ite akọrọ na-akpali akpali maka 1min, wee tinye mmiri ma nọgide na-akpali maka 2min. Gbakwunye ihe dị ka 20g nke onye ọbịa (shuga granulated na-acha ọcha), gwakọta nke ọma, wụsa ngwa ngwa ciment ahụ n'èzí site na etiti osisi ahụ n'ụdị okirikiri, mee ka ọ kpuchie osisi dị ala, mee ka ọ dị nro na spatula, wee jiri ihe mkpofu mee ihe. Ihe nkiri plastik gbasaa ya n'elu igwe ciment, wee wụsa ngwa ngwa ule na akwa tebụl plastik n'otu ụzọ ahụ iji jupụta n'elu osisi osisi. Na ozugbo na ogologo nke mmiri aluminum efere ogologo karịa obosara nke osisi ebu, ngwa ngwa scrape tinyere ogologo akụkụ nke osisi ebu.

A na-eji Microtrak II LTC-025-04 ihe mmetụta mgbapụ laser iji tụọ nhịahụ rọba n'efu nke simenti ngwa agha slab. Usoro ndị a dị ka ndị a: A na-etinye ihe nlele abụọ (obere obere ụfụfụ) n'etiti etiti nke efere ciment a wụsara, ebe dị n'etiti ihe nlele abụọ ahụ bụ 300mm. Mgbe ahụ, a na-etinye eriri ígwè nke nwere ihe mmetụta mgbapụ laser n'elu ihe atụ ahụ, ma gbanwee ọgụgụ mbụ n'etiti laser na ihe a tụrụ atụ ka ọ dị n'ime oke nha 0. N'ikpeazụ, 1000W ayodiin tungsten oriọna dị ihe dị ka 1.0m n'elu osisi na ihe ọkụ eletrik dị ihe dịka 0.75m n'elu osisi osisi (ifufe ọsọ bụ 5m / s) na-agbanye n'otu oge ahụ. Nnwale mbelata nke rọba n'efu gara n'ihu ruo mgbe ihe nlere ahụ kwụsịrị ka ọ kwụsie ike. N'oge dum ule, okpomọkụ bụ (20± 3) ℃ na ikwu iru mmiri bụ (60± 5)%.

1.2.2 Ule ule nke mmiri evaporation ọnụego

N'ịtụle mmetụta nke nhazi nke ihe ndị dabeere na ciment na ọnụ ọgụgụ mmiri evaporation, akwụkwọ ndị ahụ na-eji obere ihe atụ iji mee ka ọnụ ọgụgụ mmiri na-ekupụ mmiri nke nnukwu ihe atụ, na mmekọrịta dị n'etiti ratio Y nke mmiri evaporation nke mmiri mmiri nke nnukwu efere ciment. na ụrọ simenti obere efere na oge t(h) bụ nke a: y= 0.0002 t+0.736

2. Nsonaazụ na mkparịta ụka

2.1 Mmetụta nke ọdịnaya HPMC na ngwa ngwa ciment efu n'efu

Site mmetụta nke HPMC ọdịnaya na plastic free shrinkage nke ciment ngwa agha, ọ pụrụ ịhụ na plastic free shrinkage nke nkịtị ciment ngwa agha tumadi emee n'ime 4h nke accelerated cracking, na plastic free shrinkage na-abawanye linearly na ndọtị nke oge. Mgbe awa 4 gachara, mbelata nke plastik na-enweghị ihe ruru 3.48mm, usoro ahụ wee kwụsie ike. The plastic free shrinkage curves nke HPMC simenti ngwa agha na-niile dị n'okpuru plastic free shrinkage akụkụ nke nkịtị simenti ngwa agha, na-egosi na plastic free shrinkage akụkụ nke HPMC simenti ngwa agha niile dị nta karịa nke nkịtị ciment ngwa agha. Site na mmụba nke ọdịnaya HPMC, ngwa ngwa ciment n'efu na-eji nwayọọ nwayọọ na-ebelata. E jiri ya tụnyere ngwa ngwa ciment nkịtị, ngwa ngwa ciment na-enweghị plastik nke HPMC jikọtara ya na 0.1% ~ 0.2% (nri dị nta) na-ebelata ihe dị ka 30%, ihe dị ka 2.45mm, na ngwunye simenti na-enweghị plastik nke 0.3% HPMC na-ebelata ihe dị ka 40. % Ọ dị ihe dịka 2.10mm, na ngwa agha ciment na-enweghị plastik 0.4% na-ebelata ihe dịka 50%, nke bụ ihe dịka 1.82mm. Ya mere, n'otu accelerated cracking oge, plastic free shrinkage nke HPMC simenti ngwa agha dị ala karịa nke nkịtị ciment ngwa agha, na-egosi na incorporation nke HPMC nwere ike ibelata plastic free shrinkage nke ciment ngwa agha.

Site mmetụta nke HPMC ọdịnaya na plastic free shrinkage nke ciment ngwa agha, ọ pụrụ ịhụ na na-abawanye nke HPMC ọdịnaya, plastic free shrinkage nke ciment ngwa agha ji nwayọọ nwayọọ na-ebelata. Mmekọrịta dị n'etiti plastic free shrinkage (s) nke simenti ngwa agha na HPMC ọdịnaya (w) nwere ike dabara site na usoro ndị a: S= 2.77-2.66 w

Ọdịnaya HPMC na simenti ngwa agha rọba free shrinkage linear regression variance analysis results, ebe: F bụ ọnụ ọgụgụ; Sig. Na-anọchite anya ọkwa dị mkpa n'ezie.

Nsonaazụ gosiri na ọnụọgụ mmekọrịta nke nhatanha a bụ 0.93.

2.2 Mmetụta nke ọdịnaya HPMC na ọnụọgụ mmiri simenti na-efunahụ

N'okpuru ọnọdụ nke osooso, ọ pụrụ hụrụ si mgbanwe nke mmiri ọnwụ ọnụego nke ciment ngwa agha na ọdịnaya nke HPMC, mmiri ọnwụ ọnụego nke ciment ngwa agha elu nke nta nke nta ebelata na-abawanye nke HPMC ọdịnaya, na ihu ọma ọnọ a linear ọdịda. Tụnyere ọnụ ọgụgụ mmiri simenti nkịtị na-efunahụ, mgbe ọdịnaya HPMC bụ 0.1%, 0.2%, 0.3%, 0.4%, n'otu n'otu, ọnụ ọgụgụ mmiri na-efu nke nnukwu ụrọ simenti gbadara 9.0%, 12.7%, 22.3% na 29.4%, n'otu n'otu. Njikọ nke HPMC na-ebelata ọnụ ọgụgụ mmiri simenti na-efunahụ mmiri ma na-eme ka mmiri dị ukwuu na-ekere òkè na hydration nke ciment mortar, si otú ahụ na-emepụta ike ike zuru ezu iji guzogide ihe egwu mgbawa nke gburugburu ebe obibi na-eweta.

Mmekọrịta dị n'etiti ciment mortar water loss rate (d) na HPMC ọdịnaya (w) nwere ike dabara site na usoro a: d= 0.17-0.1w

Nsonaazụ nyocha mgbanwe dị iche iche nke linear regression nke ọdịnaya HPMC na ọnụ ọgụgụ mfu mmiri simenti na-egosi na ọnụọgụ njikọ nke nhatanha a bụ 0.91, na njikọ ahụ pụtara ìhè.

3. Nkwubi okwu

Ngwa ngwa ciment na-enweghị plastik na-ebelata nke nta nke nta site na mmụba nke ọdịnaya nke HPMC. The plastic free shrinkage nke ciment ngwa agha na 0.1% ~ 0.4% HPMC mbelata 30% ~ 50%. Ọnụọgụ mmiri simenti na-efunahụ na-ebelata site na mmụba nke ọdịnaya HPMC. Ọnụego mmiri simenti na 0.1% ~ 0.4% HPMC na-ebelata site na 9.0% ~ 29.4%. Ngwakọta simenti na-efunahụ rọba na ọnụ ahịa mmiri na-efunahụ ya na ọdịnaya nke HPMC bụ ahịrị.