Hnub Kawg Ua Ntawv Thov: 19 Cuaj Hlis, 2022
Retarder yog ib qho kev sib xyaw uas tuaj yeem cuam tshuam cov dej ntawm cov cement thiab ncua lub sijhawm hloov pauv ntawm cov khoom sib xyaw los ntawm cov yas mus rau lub xeev nyuaj.Yog li ntawd, nws tuaj yeem siv rau hauv kev lag luam pob zeb txhawm rau txhim kho qhov slump tuav ntawm pob zeb.Nws yog indispensable rau kev lag luam pob zeb.cov khoom xyaw additives.
Nyob rau hauv qhov tseeb, lub luag hauj lwm ntawm retarders yog deb tshaj li kev txhim kho cov plasticity ntawm kev lag luam pob zeb.
(1) Feem ntau cov retarders muaj qee yam kev ua haujlwm ntawm plasticizing, thiab qee cov retarders muaj cov dej txo qis tshaj qhov uas siv cov superplasticizers.Cov kev ntsuam xyuas tau pom tias cov dej-txo cov nyhuv ntawm kev siv sodium gluconate feem ntau yog ob peb zaug uas feem ntau siv naphthalene-based superplasticizers.lees paub.Thaum lub sij hawm kev tsim kho kub, nce qhov ntau npaum ntawm sodium gluconate, tus nqi tsim kho yuav tsis nce ntxiv, vim tias qhov ntau npaum li cas ntawm cov dej txo tus neeg sawv cev tuaj yeem txo qis heev.
Nyob rau hauv qhov tseeb, lub luag hauj lwm ntawm retarders yog deb tshaj li kev txhim kho cov plasticity ntawm kev lag luam pob zeb.
(1) Feem ntau cov retarders muaj qee yam kev ua haujlwm ntawm plasticizing, thiab qee cov retarders muaj cov dej txo qis tshaj qhov uas siv cov superplasticizers.Cov kev ntsuam xyuas tau pom tias cov dej-txo cov nyhuv ntawm kev siv sodium gluconate feem ntau yog ob peb zaug uas feem ntau siv naphthalene-based superplasticizers.lees paub.Thaum lub sij hawm kev tsim kho kub, nce qhov ntau npaum ntawm sodium gluconate, tus nqi tsim kho yuav tsis nce ntxiv, vim tias qhov ntau npaum li cas ntawm cov dej txo tus neeg sawv cev tuaj yeem txo qis heev.
Kev siv ntau dhau ntawm retarder hauv kev lag luam kev tsim vaj tsev yog tsis pom zoo.Kev siv ntau dhau ntawm retarder hauv pob zeb yuav tsis tsuas yog cuam tshuam rau lub zog thaum ntxov ntawm cov pob zeb, tab sis kuj cuam tshuam rau kev tsim kho.Vim lub sij hawm ntev yas ntawm cov pob zeb, nws yuav raug cua thiab lub hnub nyob rau hauv cov huab cua, thiab cov dej ntawm cov pob zeb yuav raug cuam tshuam.Ib tug loj npaum li cas ntawm evaporation ua rau cov dej poob rau ntawm qhov chaw ntawm lub pob zeb, uas ua rau ntau microcracks.Raws li cov dej poob zuj zus, cov kab nrib pleb loj hlob mus rau qhov tob, cov kua theem ntawm cov dej hauv cov pob zeb pob zeb poob qis, qhov tsis zoo siab generated maj mam nce, thiab qhov tshwm sim ntawm lub zog ua rau cov pob zeb poob vim dej poob.
Qhob nyob rau hauv ib lub xeev yas rau ib lub sij hawm ntev yuav ua rau los ntshav thiab deformation tsis sib xws ntawm aggregates thiab cementitious cov ntaub ntawv.Raws li kev ntsuam xyuas, cov yas shrinkage ntawm cov pob zeb hauv lub xeev yas rau lub sijhawm ntev tuaj yeem ncav cuag 1%, uas muaj kev cuam tshuam zoo rau cov pob zeb zoo.
Post lub sij hawm: Sep-19-2022