Taariikhda Dhiirrigelinta: 1, Abriil, 2024
Waxaa guud ahaan la rumeysan yahay in mar kasta oo heerkulku sarreeyo, in badan oo ka mid ah qaybaha sibidhka ay soo jiidan doonaan wakiilka biyaha yareeya ee polycarboxylate. Isla mar ahaantaana, heerkulku sarreeyo, ayaa si aad ah u muuqda alaabada fuuq-celinta sibidhka waxay cuni doontaa wakiilka biyaha yareeya ee polycarboxylate. Marka la eego saameynta isku dhafan ee labada saameyn, marka heerkulku kordho, dareeraha shubka ayaa ka sii daraya. Gabagabadani waxay si fiican u sharxi kartaa ifafaale in dheecaanka shubka uu kordho marka heerkulku si lama filaan ah hoos ugu dhaco, iyo luminta shubka ee shubka ayaa kordha marka heerkulku kordho. Si kastaba ha noqotee, inta lagu jiro dhismaha, waxaa la ogaaday in dareeraha shubka uu liito heerkulka hooseeya, iyo marka heerkulka biyaha isku dhafka ah la kordhiyo, dareeraha shubka ka dib mashiinka la kordhiyo. Tan laguma sharxi karo gabagabada kore. Si taas loo gaaro, tijaabooyin ayaa la sameeyaa si loo falanqeeyo, loo ogaado sababaha iska hor imaadka, iyo bixinta heerkulka ku habboon ee la taaban karo.
Si loo barto saamaynta isku dhafka heerkulka biyaha ee saamaynta kala firdhisan ee wakiilka biyaha yareeya ee polycarboxylate. Biyaha 0°C, 10°C, 20°C, 30°C, iyo 40°C ayaa loo diyaariyey siday u kala horreeyaan tijaabada iswaafajinta sibidhka-superplasticizer.
Falanqaynta ayaa muujinaysa in marka wakhtiga ka baxsan mishiinka uu gaaban yahay, balaadhinta dareeraha sibidhka marka hore wuu kordhaa ka dibna hoos u dhaco marka heerkulku kordho. Sababta dhacdadan ayaa ah in heerkulku uu saameeyaa heerka fuuq-celinta sibidhka iyo heerka adsorption ee superplasticizer-ka labadaba. Marka heerkulku kor u kaco, sida ugu dhakhsaha badan ee heerka adsorption ee molecules superplasticizer waa, sida ugu wanaagsan ee saamaynta hore u firidhsan doonaa. Isla mar ahaantaana, heerka fuuq-celinta ee sibidhka ayaa dardar-geliya, iyo isticmaalka wakiilka biyaha-yareeya ee alaabta fuuq-baxa ayaa kordha, taas oo yaraynaysa dareeraha. Ballaarinta bilawga ah ee koollada sibidhka waxaa saameeya saamaynta isku dhafan ee labadan arrimood.
Marka heerkulka biyaha isku dhafan uu yahay ≤10 ° C, heerka adsorption ee superplasticizer iyo heerka fuuqbaxa sibidhka labaduba waa yar yihiin. Waxaa ka mid ah, soo-saarka wakiilka biyaha-yareeya ee walxaha sibidhka waa qodobka xakameynaya. Maaddaama soo-saarista wakiilka biyaha-yaraynta ee qaybaha sibidhka ay gaabis tahay marka heerkulku hooseeyo, heerka bilowga ah ee yaraynta biyaha ayaa hooseeya, kaas oo lagu muujiyo dareeraha bilowga hoose ee dareeraha sibidhka.
Marka heerkulka biyaha isku dhafan uu u dhexeeyo 20 iyo 30 ° C, heerka adsorption ee wakiilka biyaha yareeya iyo heerka fuuqbaxa ee sibidhka ayaa isla mar kor u kaca, heerka adsorption ee molecules wakiilada biyaha yareeya ayaa kordha si ka badan. si cad, taas oo ka muuqata kororka dareeraha bilowga ah ee dareeraha sibidhka. Marka heerkulka biyaha isku dhafka ah uu yahay ≥40 ° C, heerka fuuq-celinta sibidhka ayaa si weyn u kordheysa oo si tartiib tartiib ah u noqda arrin xakameynaya. Natiijo ahaan, heerka xayeysiinta saafiga ah ee unugyaraha wakiilada biyaha-yareeya (heerka xayaysiinta ee laga jaray heerka isticmaalka) ayaa hoos u dhacaya, iyo dheecaanka sibidhka ayaa sidoo kale muujinaya hoos u dhac ku yimaada biyaha. Sidaa darteed, waxaa la rumeysan yahay in saameynta kala firdhinta bilowga ah ee wakiilka biyaha yareynaya ay ugu fiican tahay marka biyaha isku qasan ay u dhexeeyaan 20 iyo 30 ° C heerkulka dareeraha sibidhkana uu u dhaxeeyo 18 iyo 22 ° C.
Marka wakhtiga ka baxsan mishiinka uu dheer yahay, balaadhinta dareeraha sibidhka ayaa la socda gabagabada guud ee la aqbalay. Marka wakhtigu ku filan yahay, wakiilka biyaha yareeya ee polycarboxylate ayaa lagu dhejin karaa walxaha sibidhka heerkul kasta ilaa ay ka buuxsamaan. Si kastaba ha ahaatee, heerkulka hooseeya, wax yar oo biyo yareeya ayaa loo isticmaalaa fuuq-celinta sibidhka. Sidaa darteed, marka wakhtigu sii socdo, balaadhinta dareeraha sibidhka ayaa kordhin doona heerkulka. Kordhi iyo hoos u dhac.
Tijaabadani ma aha oo kaliya inay tixgeliso saameynta heerkulka, laakiin sidoo kale waxay fiiro gaar ah u leedahay saameynta waqtiga ee saameynta kala-baxa ee polycarboxylate wakiilka biyaha yareeya, taasoo ka dhigaysa gabagabada mid gaar ah oo u dhow xaqiiqda injineernimada. Gabagabadii la soo saaray ayaa ah sidan:
(1) Heerkulka hoose, saamaynta faafinta ee wakiilka biyaha-yaraynta polycarboxylate waxay leedahay waqti cad. Marka wakhtiga isku-darka ahi uu kordho, dareeraha dareeraha sibidhka ayaa kordha. Marka heerkulka biyaha isku dhafka ahi kordho, balaadhinta dareeraha sibidhka ayaa marka hore kordha ka dibna hoos u dhaca. Waxaa jiri kara farqi weyn oo u dhexeeya xaaladda shubka marka ay ka soo baxdo mishiinka iyo xaaladda shubka marka lagu shubo goobta.
(2) Inta lagu jiro dhismaha heerkul hoose, kuleylinta biyaha isku dhafka ah waxay gacan ka geysan kartaa hagaajinta dareeraha shubka. Inta lagu jiro dhismaha, waa in fiiro gaar ah loo yeesho xakamaynta heerkulka biyaha. Heerkulka dareeraha sibidhka waa inta u dhaxaysa 18 iyo 22 ° C, dareeraha ayaa ah kan ugu fiican marka uu ka soo baxo mishiinka. Ka hortag ifafaalaha hoos u dhaca dheecaanka shubka ee uu keeno heerkulka biyaha ee xad dhaafka ah.
(3) Marka wakhtiga ka baxsan mishiinka uu dheer yahay, balaadhinta dareeraha sibidhka ayaa hoos u dhacaya marka heerkulku kordho.
Waqtiga boostada: Abriil-01-2024
