Te Ra Whakairi: 20,Hune,2022

3. Ko te tikanga o te mahi a superplasticizers

Ko te tikanga o te kaihoko whakaheke wai hei whakapai ake i te rere o te ranunga raima ko te nuinga o nga paanga marara me te whakahinuhinu.Ko te kaihoko whakaheke wai he tino wairewa, ko tetahi pito o te mekameka ngota roa he ngawari ki te wairewa ki te wai - te roopu hydrophilic, me tetahi pito he koretake ki te wai - te roopu hydrophobic.

a.Te whakamararatanga: I muri i te konatunatua te ciment ki te wai, na te kukume o te ngota ngota o nga matūriki ciment, ka hangaia e te slurry ciment he hanganga flocculation, kia takai te 10% ki te 30% o te wai whakaranu ki nga matūriki ciment me te kore e uru ki te kore utu. rere me te whakahinuhinu.pānga, na reira ka pa ki te rere o te ranunga raima.A, no te te tāpiri i te māngai whakaiti wai, no te mea ka taea e te wai rāpoi ngota kaihoko whakaiti i te ahunga adsorbed i runga i te mata o te matūriki ciment, te mata o te matūriki ciment he taua utu (te tikanga he utu tōraro), te hanga i te pānga repulsion electrostatic, e whakatairanga i te marara o nga matūriki ciment me te whakangaromanga o te hanganga flocculation., tukua te wahi takai o te wai ka uru ki te rere, na reira ka whai hua te whakanui ake i te rere o te ranunga raima.

b.Whakahinuhinu: Ko te roopu hydrophilic i roto i te superplasticizer he tino polar, na ko te kiriata adsorption o te superplasticizer i runga i te mata o nga matūriki ciment ka taea te hanga i te kiriata wai solvated pūmau ki te wai rāpoi ngota wai, me tenei kiriata wai he pai Whakahinuhinu taea tōtika whakaiti i te retireti. te aukati i waenga i nga matūriki ciment, na reira ka pai ake te rere o te raima.

Te painga o te whakaheke wai ki runga raima, aha atu:

a.Whakaritea te wa.Ko nga superplasticizers te tikanga karekau he whakaroa, a tera pea ka whakatairanga i te whakamakuku me te whakapakeke o te sima.Ko te superplasticizer retarded he hiato o te superplasticizer me te retarder.I raro i nga ahuatanga noa, hei whakaroa i te whakamakuku o te ciment me te whakaiti i te ngaro o te paheketanga, ka taapirihia he nui o te retarder ki te kaihoko whakaheke wai.

b.ihirangi hau.I tenei wa, ko te whakaheke wai polycarboxylate e whakamahia nuitia ana he ihirangi hau, a kaua e nui rawa te hau o te raima, ki te kore ka tino heke te kaha raima.

c.Te pupuri wai.

Kare e tino whai hua nga superplasticizer ki te whakaheke i te toto o te raima, ka nui ake pea te toto.Ka piki te toto raima ina he nui te horopeta.