Hydroxypropyl methylcellulose ether na Njirimara nke iji uyi ngwa agha

A mụrụ mmetụta nke hydroxypropyl methylcellulose ether na njirimara nke ngwa agha ijiji, na mmekọrịta dị n'etiti njupụta mmiri na ike mkpakọ. Nsonaazụ ule ahụ gosiri na ịgbakwụnye hydroxypropyl methylcellulose ether iji efe ngwa ngwa nwere ike imeziwanye ọrụ njigide mmiri nke ngwa agha ahụ, mee ka oge njikọ nke ngwa agha ahụ dịkwuo ogologo, ma belata njupụta mmiri na ike mkpakọ nke ngwa agha ahụ. Enwere ezigbo njikọ n'etiti njupụta mmiri na ike mkpakọ 28d. N'okpuru ọnọdụ nke njupụta mmiri ama ama, enwere ike gbakọọ ike mkpakọ 28d site na iji usoro dabara adaba.

Isi okwu:ofufe ash; cellulose ether; njide mmiri; ike mkpakọ; mmekorita

Ka ọ dị ugbu a, a na-eji ntụ ijiji eme ihe n'ịrụ ụlọ. Ịgbakwunye a ụfọdụ ego nke iji uyi na ngwa agha nwere ike ọ bụghị naanị melite n'ibu Njirimara na anwụ ngwa ngwa nke ngwa agha, ma belata-eri nke ngwa agha. Otú ọ dị, ngwa agha na-efe efe na-egosi njigide mmiri ezughị ezu, yabụ otu esi eme ka njigide mmiri nke ngwa agha aghọọla nsogbu ngwa ngwa a ga-edozi. Cellulose ether bụ admixture dị elu nke a na-ejikarị eme ihe n'ụlọ na ná mba ọzọ. Ọ bụ naanị na ọ dị mkpa ka a gbakwunye ya na obere ego iji nwee mmetụta dị ukwuu na ihe ngosi arụmọrụ dị ka njide mmiri na ike mkpakọ nke ngwa agha.

1. Ngwa ngwa na ụzọ ule

1.1 Akụrụngwa

Simenti bụ P·Simenti Portland nkịtị 42.5 ọkwa nke Hangzhou Meiya Cement Factory rụpụtara; ntụ ijiji bụ ọkwaⅡntu; ájá bụ ájá nkịtị na-ajụkarị nke nwere ezigbo ịdị mma nke 2.3, njupụta buru ibu nke 1499kg.·m-3, na mmiri ọdịnaya nke 0.14%, apịtị 0,72%; hydroxypropyl methyl cellulose ether (HPMC) bụ nke Shandong Heda Co., Ltd na-emepụta, akara bụ 75HD100000; mmiri na-agwakọta bụ mmiri pọmpụ.

1.2 Nkwadebe ngwa agha

Mgbe agwakọta cellulose ether modified ngwa agha, mbụ mix HPMC na simenti na ofufe uyi juputara, mgbe ahụ akọrọ mix na ájá maka 30 sekọnd, tinye mmiri na mix n'ihi na ọ bụghị ihe na-erughị 180 sekọnd.

1.3 Usoro ule

A ga-atụle nkwụsi ike, njupụta mmiri mmiri, delamination na ịtọ oge nke ngwa agha agwakọtara ọhụrụ dị ka ụkpụrụ ndị dị mkpa si dị na JGJ70-90 "Ụzọ Nleba Nleba Arụmọrụ nke Nrụpụta Mortar". A na-ekpebi njide mmiri nke ngwa agha dị ka usoro ule maka njide mmiri nke ngwa ngwa dị na Mgbakwunye A nke JG/T 230-2007 "Njikere Ngwakọta Ngwakọta". Nnwale ike mkpakọ na-anabata 70.7mm x 70.7mm x 70.7mm cube agbada ule ebu. A na-agwọta ngọngọ ule a kpụrụ na okpomọkụ nke (20±2)°C ruo awa 24, ma mgbe ọ gwụchara, a na-aga n'ihu na-agwọ ya na gburugburu ebe okpomọkụ nke (20).±2)°C na iru mmiri dị n'elu karịa 90% ruo afọ a kara aka, dịka JGJ70-90 si kwuo "Ulo ụlọ Mortar Basic arụmọrụ usoro" mkpebi siri ike nke mkpakọ ya.

2. Nnwale ule na nyocha

2.1 Njupụta mmiri

Enwere ike ịhụ site na mmekọrịta dị n'etiti njupụta na ọnụ ọgụgụ nke HPMC na njupụta mmiri nke nta nke nta na-ebelata na mmụba nke ego HPMC. Mgbe ego HPMC bụ 0.05%, njupụta mmiri nke ngwa agha ahụ bụ 96.8% nke ngwa ngwa benchmark. Mgbe ọnụọgụ HPMC na-aga n'ihu na-abawanye, Mbelata ọsọ nke njupụta mmiri na-abawanye. Mgbe ọdịnaya nke HPMC bụ 0.20%, njupụta mmiri nke ngwa agha bụ naanị 81.5% nke ngwa ngwa benchmark. Nke a bụ tumadi n'ihi mmetụta ikuku-entraning nke HPMC. Afụ ikuku ewepụtara na-amụba porosity nke ngwa agha ahụ ma na-ebelata mkpokọta, na-ebute mbelata njupụta njupụta nke ngwa agha ahụ.

2.2 ịtọ oge

Enwere ike ịhụ site na mmekọrịta dị n'etiti oge coagulation na ọnụ ọgụgụ nke HPMC na oge coagulation na-eji nwayọọ nwayọọ na-abawanye. Mgbe usoro onunu ogwu bụ 0.20%, oge nhazi na-abawanye site na 29.8% ma e jiri ya tụnyere ngwa ngwa ntụaka, na-eru ihe dịka 300min. Enwere ike ịhụ na mgbe usoro onunu ogwu bụ 0.20%, oge nhazi nwere nnukwu mgbanwe. Ihe kpatara ya bụ na L Schmitz et al. kwenyere na a na-etinyekarị mkpụrụ ndụ cellulose ether na ngwaahịa hydration dị ka cSH na calcium hydroxide, na ọ naghị adịkarị ngwa ngwa ngwa ngwa ngwa ngwa nke clinker. Na mgbakwunye, n'ihi mmụba nke viscosity nke ngwọta pore, cellulose ether na-ebelata. Mgbanwe nke ion (Ca2+, so42-…) na ngwọta pore na-egbu oge usoro hydration.

2.3 Layering na mmiri na-ejigide

Ma ogo nke delamination na njide mmiri nwere ike ịkọwa mmetụta njide mmiri nke ngwa agha. Site na mmekọrịta dị n'etiti ogo nke delamination na ọnụ ọgụgụ nke HPMC, a pụrụ ịhụ na ogo nke delamination na-egosi mbelata na-emekarị ka ọnụ ọgụgụ nke HPMC na-abawanye. Mgbe ọdịnaya nke HPMC bụ 0.05%, ogo nke delamination na-ebelata nke ukwuu, na-egosi na mgbe ọdịnaya nke fiber ether dị ntakịrị, a ga-ebelata ogo nke delamination nke ukwuu, mmetụta nke njide mmiri nwere ike ime ka ọ dịkwuo mma, na ịrụ ọrụ na ọrụ. workability nke ngwa agha nwere ike imeziwanye. Na-ekpe ikpe site na mmekọrịta dị n'etiti ihe onwunwe mmiri na ọnụ ọgụgụ nke HPMC, ka ọnụ ọgụgụ nke HPMC na-abawanye, njide mmiri na-eji nwayọọ nwayọọ na-adịwanye mma. Mgbe usoro onunu ogwu ahụ na-erughị 0.15%, mmetụta njide mmiri na-abawanye nke ọma, ma mgbe usoro ọgwụgwọ ruru 0.20%, a na-eme ka njide mmiri dịkwuo mma, site na 90.1% mgbe usoro ọgwụgwọ bụ 0.15%, ruo 95%. Ọnụ ego nke HPMC na-aga n'ihu na-abawanye, na ịrụ ọrụ nke ngwa agha na-amalite ịka njọ. Ya mere, n'ịtụle ọrụ njigide mmiri na ịrụ ọrụ ihe owuwu, ego kwesịrị ekwesị nke HPMC bụ 0.10% ~ 0.20%. Nyocha nke usoro njide mmiri ya: Cellulose ether bụ polymer organic na-edozi mmiri, nke kewara n'ime ionic na ndị na-abụghị ionic. HPMC bụ ether cellulose na-abụghị ionic nwere otu hydrophilic, otu hydroxyl (-OH) na njikọ ether (-0-1) na usoro nhazi ya. Mgbe agbazere na mmiri, ikuku oxygen na otu hydroxyl na ether bond na mmiri Molecules na-ejikọta iji mepụta njikọ hydrogen, nke na-eme ka mmiri na-efunahụ ya, na mmiri n'efu adịkwaghị n'efu, si otú a na-enweta mmetụta nke njide mmiri na njupụta.

2.4 ike mkpakọ

Site na mmekọrịta dị n'etiti ike mkpakọ na ọnụ ọgụgụ nke HPMC, a pụrụ ịhụ na na mmụba nke ego HPMC, ike mkpakọ nke 7d na 28d gosipụtara na-ebelata ọnọdụ, nke bụ isi n'ihi ntinye nke ọnụ ọgụgụ buru ibu. nke ikuku ikuku nke HPMC, nke mere ka porosity nke ngwa agha dịkwuo ukwuu. mmụba, na-ebute mbelata nke ike. Mgbe ọdịnaya dị 0.05%, ike mkpakọ 7d na-ada nke ukwuu, ike na-ada site na 21.0%, na ike mkpakọ 28d na-ada site na 26.6%. Enwere ike ịhụ site n'usoro na mmetụta nke HPMC na ike mkpakọ pụtara nke ọma. Mgbe usoro onunu ogwu dị obere, a ga-ebelata nke ukwuu. Ya mere, na ngwa ndị bara uru, a ghaghị ịchịkwa usoro ọgwụgwọ ya ma jiri ya na-ejikọta ya na defoamer. Na-enyocha ihe kpatara ya, Guan Xuemao et al. kwenyere na nke mbụ, mgbe a na-agbakwunye cellulose ether na ngwa agha ahụ, polymer na-agbanwe agbanwe na pores nke ngwa agha na-abawanye, na polymers na pores ndị a na-agbanwe agbanwe enweghị ike inye nkwado siri ike mgbe a na-ejikọta ngọngọ ule. Matriks ahụ mejupụtara na-ebelata nke ukwuu, si otú a na-ebelata ike mkpakọ nke ngwa agha ahụ; Nke abuo, n'ihi na mmiri njigide mmetụta nke cellulose ether, mgbe ngwa agha test ngọngọ e guzobere, ọtụtụ n'ime mmiri na-anọgide na ngwa agha, na n'ezie mmiri-ciment ruru bụ ala karịa nke na-enweghị Ndị bụ ukwuu ibu, otú compressive ike. A ga-ebelata ngwa ngwa ngwa ngwa.

2.5 Mmekọrịta dị n'etiti ike mkpakọ na njupụta mmiri

Enwere ike ịhụ ya site na usoro mmekọrịta dị n'etiti ike mkpakọ na njupụta mmiri na mgbe ntinye akara nke isi ihe niile dị na ọnụ ọgụgụ ahụ, a na-ekesa ihe ndị kwekọrọ na nke ọma n'akụkụ abụọ nke eriri kwesịrị ekwesị, na enwere njikọ dị n'etiti njupụta mmiri na mkpakọ. Njirimara ike, na njupụta mmiri dị mfe ma dị mfe ịlele, yabụ enwere ike gbakọọ ike mkpakọ nke ngwa agha 28d site na nha nha dabara adabara. Egosiri nha nha dabara adaba n'usoro (1), R²= 0.9704. Y=0.0195X-27.3 (1), ebe, y bụ ike mkpakọ 28d nke ngwa agha, MPa; X bụ njupụta mmiri mmiri, kg m-3.

3. Nkwubi okwu

HPMC nwere ike imeziwanye mmetụta njigide mmiri nke ngwa agha ijiji wee gbatịa oge ọrụ nke ngwa agha ahụ. N'otu oge ahụ, n'ihi mmụba nke porosity nke ngwa agha, nnukwu njupụta ya na ike mkpakọ ga-adaba nke ọma, ya mere a ga-ahọrọ usoro kwesịrị ekwesị na ngwa ahụ. Ike mkpakọ nke 28d nke ngwa agha nwere njikọ dị mma na njupụta mmiri, na enwere ike gbakọọ ike mkpakọ 28d site na ịlele njupụta mmiri, nke nwere uru ntụaka dị mkpa maka njikwa mma nke ngwa agha n'oge a na-ewu ụlọ.