Dulmar guud ee Isku-habaynta Isku-dhafka

Isku-darka isku-dhafka ah, agabyada muhiimka ah ee injineernimada sagxadaha dhismaha ee casriga ah, ayaa sida caadiga ah laga soo sameeyay sibidhka Portland, isku-darka wanaagsan, polymers-ka shaqeeya, iyo waxyaabaha lagu daro khaaska ah. Hantidooda gaarka ah ee is-beddelka ah waxay ka timaadaa dareeraha dareeraha sarreeya ee la sameeyay ka dib marka la isku daro, kaas oo si toos ah u simi kara culeyska si uu u abuuro saldhigyo siman oo dhumucdiisu tahay 3mm ilaa 50mm.

Codsiyada caadiga ah waxaa ka mid ah dhirta warshadaha (tusaale, sagxadaha saxda ah ee sagxadaha wax soo saarka baabuurta), goobo ganacsi (tusaale, sagxadaha waaweyn ee u adkaysta xidhashada ee aagga wayn), iyo mashaariicda deegaanka ee dhamaadka-sare (tusaale, lakabyada siman ee nidaamka kululaynta dhulka hoostiisa).

Faa'iidooyinka Dhismaha

Marka la barbar dhigo hababka habaynta hoobiye-dhaqameedka, isku-darka isku-dhafka ah ayaa kor u qaadaya waxtarka dhismaha 40%-60%. Sifada daawaynta degdega ah waxay si weyn u soo gaabinaysaa muddada mashruuca, taasoo ka dhigaysa inay ku habboon yihiin "dhismaha habeen-dhisidda maalinta soo socota" xaaladaha mashaariicda cusboonaysiinta.

Waa maxay sababta HPMC loogu isticmaalo isku-darka isku-darka? Sidee Waxqabadku yahay?

a. Xeerka Haynta Biyaha

Unugyada HPMC waxay ku daraan biyaha iyada oo loo marayo bonds hydrogen, samaynta shabakad saddex-cabbir ah oo kordhisa haynta biyaha hoobiye ilaa 90% (marka la barbardhigo 75% HPMC la'aanteed). Deegaannada heerkulku sarreeyo (> 30°C), doorashada HPMC ee leh heerkulka gelation ≥65°C waxay dib u dhigaysaa uumi-baxa biyaha, iyadoo ka hortagaysa luminta xoogga sababtoo ah fuuq-baxa sibidhka oo aan ku filnayn.

b. Hagaajinta Hantida Rheological

• Xakamaynta socodkaViscosity-hooseeya HPMC (tusaale, 400Mpas) waxay yaraynaysaa walaaca soosaarka, gaaritaanka qiyamka socodka bilowga ah ee 180-220mm ee is-dheellitirka khafiifka ah (3-5mm); Noocyada viscosity-sare (tusaale, 15000Mpas) waxay xoojiyaan thixotropy, ka hortagga isku-darka isku-darka ee dhismaha lakabka qaro weyn (10-50mm) si loo hubiyo cufnaanta isku midka ah.

• Saamaynta Isku-dhafkaMarka lagu daro biyo yareeya polycarboxylate, HPMC waxay joojisaa kala soocida. Marka la joogo 0.3% biyo-dhimista iyo 0.12% HPMC, luminta socodka 30-daqiiqo ≤10%, buuxinta shuruudaha socodka wakhtiga ku-tiirsanaanta ee is-heeraynta.

c. Yaraynta iyo Joojinta dillaaca

Dib u dhigista fuuq-celinta sibidhka (kordhinta wakhtiga dejinta bilowga ah 15-30 daqiiqo), HPMC waxay yaraynaysaa diiqada hore ee hoos u dhaca in ka badan 30%.Imtixaannada qallajinta, hoobiyeyaal leh HPMC waxay muujinayaan 28-maalmood dhimis heerka 0.018%, oo aad uga hooseeya 0.035% muunadaha aan HPMC ahayn, si wax ku ool ah u yareeya dildilaaca yar yar.

Sidee loo doortaa HPMC saxda ah si ay ula mid noqoto Muuqaal Dhismayaasha Isku-dhafka ah ee kala duwan?

Heerka warshadaha HPMC waxaa lagu kala saaray viscosity ee 2% xal aqueous galay-nuggu hooseeya ( 30000Mpas) noocyada, quudinta shuruudaha dhismaha kala duwan.

Metrics furahaDhismayaasha kala duwanMuuqaal

Tusaalaha Samaynta (Is-heeraynta Ku Salaysan Gypsum):Saldhigga aasaasiga ah: gypsum α-hemihydrate 60%, calcium carbonate 30%, ciid quartz (80-120 mesh) 10%; Waxyaalaha lagu daro: HPMC (20000mPa·s, 0.18%), retarder (tartaric acid, 0.05%), biyo-yareeya (melamine-ku salaysan, 0.3%.(Tan waxa loogu talagalay tixraacaada oo keliya) 

Gabagabo

Sida wax-ku-darka udub-dhexaadka u ah isku-darka isku-dhafka,HPMCsaameeyaa wax-qabadka walxaha inta lagu jiro diyaarinta, dhismaha, iyo nolosha adeegga. Iyadoo ay sii kordhayaan baahida loo qabo saxnaanta sagxadaha ee dhismaha warshadaynta,HPMCxulashada iyo tignoolajiyada codsigu waxay noqon doonaan kuwo la safeeyey oo caqli badan.