Ko te Hydroxypropyl methylcellulose he pūhui polymer wairewa-wai, e mohiotia ana ano he kapia wairewa-wai, he polymer wairewa-wai ranei. Ka whakapakeke i te ranunga ma te whakanui ake i te pokey o te wai whakaranu. He rauemi polymer hydrophilic. Ka taea te rewa ki roto i te wai kia puta he otinga, he marara ranei. Ko nga whakamatautau e whakaatu ana ka piki ake te nui o te superplasticizer-naphthalene-based superplasticizer, ko te whakauru o te superplasticizer ka whakaiti i te aukati marara o te moata ciment hou kua konatunatua. Na te mea he surfactant te naphthalene superplasticizer. I te wa e whakauruhia ai te kaihoko whakaheke wai ki te moata, ka whakaritea te wai whakaheke wai ki runga i te mata o nga matūriki ciment, kia rite tonu te utu o te mata o nga matūriki ciment. Ko tenei whakakorenga hiko ka whakakore i te hanganga pupuhi i hangaia e nga matūriki ciment, ka tukuna te wai i takai ki roto i te hanganga, ka mutu te ngaro o te waahanga o te ciment. I te wa ano, i kitea i te pikinga o nga ihirangi HPMC, ka pai ake te kaha o te marara o te kumete ciment hou.
Te kaha o te raima:
Ko te whakaurunga raima kore-dispersible HPMC i raro i te wai ka whakamahia i roto i te miihini turanga piriti huarahi nui, a ko te taumata kaha o te hoahoa ko C25. E ai ki te whakamatautau taketake, ko te nui o te ciment he 400kg, ko te nui o te microsilica ko 25kg / m3, ko te nui tino pai o te HPMC ko te 0.6% o te nui o te ciment, ko te wai-ciment ko te 0.42, ko te tauwehenga onepu he 40%, a ko te putanga o te naphthyl superplasticizer he 8% o te nui ciment. , Ko nga tauira raima i roto i te rangi mo nga ra 28 he kaha toharite o 42.6MPa, me te raima i ringihia ki raro i te wai mo nga ra 28 me te maturuturu wai o te 60mm he kaha toharite o 36.4 MPa.
1. Ko te taapiri o te HPMC ka kitea te whakaroa i te ranunga moata. Na te pikinga o nga ihirangi HPMC, ka roa haere te wa whakatakoto mo te kumete. I raro i te ihirangi HPMC kotahi, he pai ake te kumete i hangaia i raro i te wai i te kumete i hangaia ki te hau. He roa ake te wa whakakoi o te hanga. Ko tenei ahuatanga ka awhina i te pupuhi raima i raro i te wai.
2. He pai te mahi honohono o te kumete ciment hou i konatunatua ki te hydroxypropyl methylcellulose me te kore e toto.
3. Ko te ihirangi o te HPMC me te hiahia wai o te kumete i te tuatahi ka heke, katahi ka tino piki haere.
4. Ko te whakaurunga o te kaihoko whakaheke wai ka pai ake te raru o te nui haere o te tono wai mo te kumete, engari me whakahaere tika, ki te kore ka whakaitihia i etahi wa te parenga marara o raro i te wai o te kumete ciment hou i konatunatua.
5. He iti noa te rereketanga o te hanganga o te tauira whakapiri ciment i konatunatua ki te HPMC me te tauira tuwhera, a he iti noa te rereketanga o te hanganga me te kiato o te tauira whakapiri ciment i roto i te ringihia o te wai me te hau. Ko te tauira i hanga i muri i nga ra 28 i raro i te wai he paku wetewete. Ko te take nui ko te taapiri o te HPMC ka nui te whakaheke i te mate me te marara o te ciment i te wa e ringihia ana ki te wai, engari ka whakaheke ano hoki i te taapiri o te kohatu ciment. I roto i te kaupapa, me whakaitihia te nui o te HPMC i te mea ka taea te whakarite i te painga o te kore marara i raro i te wai.
6. Ko te huinga o te HPMC i raro i te wai kore-dispersible whakauru raima, te mana o te nui he pai ki te whakapai ake i te kaha. Kua whakaatuhia e nga kaupapa pairati ko te raima i hangaia i roto i te wai he kaha o te kaha o te 84.8% o te mea i hangaia i roto i te hau, a he nui ake te painga.
Wā tuku: Hune-16-2023