I-ether ye-cellulosekuzokwandisa isikhathi sokusetha i-cement paste noma i-mortar net, kubambezele i-cement hydration kinetics, okuzuzisa ukuthuthukisa isikhathi sokusebenza kwezinto eziyisisekelo ze-cement, kuthuthukise ukuhambisana kanye nokuwa kwekhonkrithi ngemva kokulahlekelwa, kodwa futhi kungase kubambezele inqubekela phambili yokwakha, ikakhulukazi ezimweni zemvelo eziphansi zokushisa kokusetshenziswa kwekhonkrithi.
Ngokuvamile, uma okuqukethwe kwe-cellulose ether kuphakeme, isikhathi sokusetha kwe-slurry kanye ne-mortar yesimende siba side, futhi kusobala kakhulu ukuthi i-hydration dynamics ebambezelekile iyabambezeleka. I-Cellulose ether ingabambezela i-hydration yezigaba zamaminerali ze-clinker ezibaluleke kakhulu i-triccalcium aluminate (C3A) kanye ne-triccalcium silicate (C3S) kusimende, kodwa umphumela ku-hydration kinetics yazo awufani. I-Cellulose ether inciphisa kakhulu izinga lokusabela kwe-C3S esigabeni sokusheshisa, kuyilapho ohlelweni lwe-C3A-Caso4, ikakhulukazi yandisa isikhathi sokungeniswa.
Ukuhlolwa okwengeziwe kubonise ukuthi i-cellulose ether ingavimbela ukuncibilika kwe-C3A kanye ne-C3S, ibambezele ukukristaleka kwe-calcium aluminate emanzi kanye ne-calcium hydroxide, futhi inciphise i-nucleation kanye nezinga lokukhula kwe-CSH ebusweni bezinhlayiya ze-C3S, kodwa ibe nomthelela omncane kumakristalu e-ettringite. UWeyer nabanye bathole ukuthi izinga lokushintshana kwe-DS kwakuyisici esiyinhloko esithinta ukuncibilika kwesimende, futhi uma i-DS encane yayikhona, kusobala kakhulu ukuthi ukuncibilika kwesimende okulibazisekile kwakusobala. Endleleni yokusebenza kwe-cellulose ether ukuncibilika kwesimende.
USliva nabanye bakholelwa ukuthi i-cellulose ether yandisa i-viscosity yesisombululo se-pore futhi yavimbela izinga lokunyakaza kwama-ion, ngaleyo ndlela yalibazisa i-cement hydration. Kodwa-ke, uPourchez nabanye bathole ukuthi ubudlelwano phakathi kwe-cellulose ether ebambezele i-cement hydration kanye ne-cement slurry viscosity babungabonakali. USchmitz nabanye bathole ukuthi i-viscosity ye-cellulose ether yayingenawo umthelela ku-hydration kinetics ye-cement.
UPourchez uphinde wathola ukuthi i-cellulose ether yayizinzile kakhulu ngaphansi kwezimo ze-alkaline futhi ukumuncwa kwayo kwesimende okulibazisekile akubangelwanga ukubola kwe-i-cellulose etherUkumuncwa kungaba yimbangela yangempela yokulibaziseka kwe-cellulose ether ukumuncwa kwe-cement, izithasiselo eziningi eziphilayo zizomuncwa ezinhlayiyeni ze-cement kanye nemikhiqizo yokumuncwa kwe-cement, zivimbele ukuncibilika kwezinhlayiya ze-cement kanye nokukristala kwemikhiqizo yokumuncwa kwe-cement, ngaleyo ndlela zibambezele ukumuncwa kwe-cement kanye nokujiya kwayo. UPourchcz nabanye bathole ukuthi lapho amandla okumuncwa kwemikhiqizo yokumuncwa kwe-cement kanye ne-cellulose ether eqina, kulapho ukubambezeleka kusobala khona.
Ngokuvamile kukholelwa ukuthi ama-molecule e-cellulose ether afakwa kakhulu emikhiqizweni yokufutha amanzi futhi awafakwa kakhulu esigabeni sokuqala samaminerali se-clinker.
Isikhathi sokuthunyelwe: Ephreli-28-2024