Cellulose ether ga-egbu oge hydration nke ciment na ogo dị iche iche, nke na-egosipụta na igbu oge nhazi ettringite, CSH gel na calcium hydroxide. Ka ọ dị ugbu a, usoro nke cellulose ether na-egbu oge hydration ciment na-agụnyekarị echiche nke mmegharị ion na-egbochi, mmebi alkali na adsorption.
1. Echiche nke mmegharị ion na-egbochi
A na-eche na cellulose ethers na-abawanye viscosity nke ngwọta pore, na-egbochi ọnụ ọgụgụ nke ion ije, si otú ahụ na-egbu oge ciment hydration. Otú ọ dị, na nnwale a, cellulose ether na ala viscosity nwere ike dị ike karị igbu oge ciment hydration, n'ihi ya, echiche a anaghị ejide. N'ezie, oge maka ijegharị ion ma ọ bụ ịkwaga dị mkpụmkpụ, nke doro anya na-enweghị atụ na oge nkwụsị nke ciment hydration.
2. Nbibi alkaline
Polysaccharides na-agbadata ngwa ngwa n'okpuru ọnọdụ alkaline iji mepụta acid hydroxycarboxylic nke na-egbu oge mmiri ciment. Ya mere, ihe mere cellulose ether na-egbu oge ciment hydration nwere ike ịbụ na ọ na-eweda na alkaline ciment slurry na-etolite hydroxycarboxylic acid, ma ọmụmụ chọpụtara na Cellulose ether bụ nnọọ ike n'okpuru alkaline ọnọdụ, naanị ubé degraded, na degraded ngwaahịa nwere fọrọ nke nta ka ọ dịghị mmetụta. na igbu oge nke ciment hydration.
3. Adsorption
Adsorption nwere ike ịbụ ezigbo ihe kpatara cellulose ether ji egbu oge hydration ciment. Ọtụtụ ihe mgbakwunye organic ga-adaba na akụkụ ciment na ngwaahịa hydration, na-egbochi mgbasa nke simenti na kristal nke ngwaahịa hydration, si otú ahụ na-egbu oge hydration na nhazi nke ciment. Achọpụtara na cellulose ether na-adị mfe na-adaba na calcium hydroxide, C. S. N'elu ngwaahịa hydration dị ka H gel na calcium aluminate hydrate, mana ọ naghị adị mfe ịnweta site na ettringite na usoro enweghị mmiri. Ọzọkwa, n'ihe gbasara cellulose ether, ikike adsorption nke HEC siri ike karịa nke MC, na ala ọdịnaya nke hydroxyethyl na HEC ma ọ bụ hydroxypropyl na HPMC, ike adsorption siri ike bụ: n'ihe gbasara ngwaahịa hydration, hydrogen. Ike adsorption nke calcium oxide C.S. Ike adsorption nke H siri ike. Ntụle ọzọ na-egosikwa na ikike adsorption nke ngwaahịa hydration na cellulose ether nwere njikọ kwekọrọ na nkwụsị nke ciment hydration: otú ahụ ka adsorption siri ike karị, nke a na-apụta ìhè na igbu oge, ma adsorption nke ettringite na cellulose ether adịghị ike, ma nhazi ya. e gbutere oge nke ukwuu. Nnyocha egosiwokwa na cellulose ether nwere adsorption siri ike na tricalcium silicate na ngwaahịa hydration ya, si otú a na-egbu oge hydration nke usoro silicate, ma nwee mgbasa ozi dị ala na ettringite, ma a na-egbochi nhazi nke ettringite. O doro anya na ọ na-egbu oge, nke a bụ n'ihi na ettringite na-egbu oge na-emetụta nguzozi Ca2 + na ngwọta, nke bụ ihe na-aga n'ihu nke hydration silicate na-egbu oge nke cellulose ether.
Na nsonaazụ ule, ikike retarding nke HEC siri ike karịa nke MC, na ikike nke cellulose ether iji gbuo oge nhazi calcium hydroxide siri ike karịa nke C. S. Ikike nke H gel na ettringite siri ike, nke nwere njikọ kwekọrọ na ikike adsorption nke cellulose ether na ciment hydration ngwaahịa. Akwukwara na mgbasa ozi nwere ike ịbụ ezigbo ihe kpatara cellulose ether ji egbu oge hydration ciment, na cellulose ether na cement hydration ngwaahịa nwere njikọ kwekọrọ. Ka ikike adsorption nke ngwaahịa hydration ciment na-esiwanye ike, ka ahụ na-apụtawanye ìhè n'ichepụta ngwaahịa hydration na-egbu oge. Nsonaazụ ule gara aga na-egosi na ethers cellulose dị iche iche nwere mmetụta dị iche iche na Portland cement hydration delay, na otu cellulose ether nwere mmetụta igbu oge dị iche iche na ngwaahịa hydration dị iche iche, nke na-egosi na Portland cement hydration ngwaahịa nwere mmetụta dị iche iche na eriri. Mgbasa ozi nke cellulose ether bụ nhọrọ, na mgbasa ozi nke cellulose ether na ngwaahịa hydration ciment bụkwa nhọrọ.
Oge nzipu: Feb-27-2023