Superplasticizer (I)

Hnub Kawg: Lub Tsib Hlis 9, 2022

(Ib) Adaptability ntawmpolycarboxylate superplasticizer thiab cov ntaub ntawv cementitious:

Hauv kev xyaum, nws tau pom tiasPolycarboxylate Superplasticizermuaj teeb meem adaptability rau cov cements sib txawv thiab ntau hom ntxhia admixtures, thiab qee zaum lawv txawm picky heev. Lub adaptability ntawm cement thiabpolycarboxylate superplasticizer yuav raug cuam tshuam los ntawm ntau yam. Xws li: cov khoom siv cement, thaj chaw tshwj xeeb, cov ntsiab lus alkali, cov ntsiab lus gypsum thiab ntau yam muaj feem cuam tshuam rau kev hloov pauv ntawmPolycarboxylate Superplasticizer.

Lub saturation point ntawmPolycarboxylate Superplasticizerrau cov cements sib txawv yog qhov sib txawv, cov dej txo qis, qhov poob qis ntawm cov pob zeb yog nce, qhov tshwm sim ntawm "taum curd residue" tshwm sim thaum cov pob zeb tsis muaj slurry, thiab cov teeb meem ntawm los ntshav, sedimentation thiab segregation, thiab nyuaj rau kev siv. , rhiab heev rau qhov ntau npaum li cas, cov pob zeb tsis tuaj yeem qhib lossis tso tawm ntau dhau. Piv txwv li, cov ntsiab lus ntawmpolycarboxylate superplasticizer rau A cement yog 1.8% (cov ntsiab lus ntawm 10%) kom tau txais lub xeev txaus siab, thaum B cement yuav tsum tau tov nrog 2.2% kom tau txais lub xeev zoo dua, thiab qee zaum thaum nws ntau dua 2.2% ntawm cov tshuaj, cov pob zeb sib xyaw yog nquag los ntshav.

Tam sim no, nyob rau hauv cov nqe lus ntawm adaptability ntawmPolycarboxylate Superplasticizer, cov kev daws teeb meem yog raws li nram no:

(1) Nyob rau ntawm qhov chaw ntawm kev ua kom lub zog ntawm cov pob zeb, los ntawm kev kho cov xuab zeb, qhov sib piv ntawm cov ntxhib sib xyaw, thiab ua kom cov pob zeb ua slurry;

(2) Cov cawv niam yog sib xyaw nrog ether lipids thiab qhov ntau npaum li cas yog qhov tsim nyog. Feem ntau, nws raug pom zoo tias ethers thiab lipids 5: 5 muaj cov txiaj ntsig zoo dua, thiab cov koob tshuaj yuav tsum tau nce 0.2%;

(3) Tsim nyog ntxiv lossis hloov nws cov khoom siv, siv cov khoom siv huab cua xws li SJ, Degussa DY, ua npuas ncauj stabilizer AR, K12, ua kom muaj kev sib npaug ntawm cov khoom khaws cia, siv sodium gluconate, qab zib, phosphate, ATMP, citric acid, Hloov cov hmoov txhuv nplej siab thiab lwm cov khoom sib xyaw ua ke, siv cov cellulose soluble, xanthan cov pos hniav, dextrin, hloov cov kua nplaum tuab, lossis ntxiv "sulfur" lossis "alkali" rau pob zeb ua kom zoo dua;

(4) Hloov cov qauv molecular ntawm polycarboxylic acid, thiab kho ib co Cheebtsam nyob rau hauv cov txheej txheem synthesis los kho nws adaptability.

Rau admixtures, qhov cuam tshuam ntawm yoov tshauv yog pom tseeb ntau dua li cov hmoov slag. Feem ntau hais lus, thawj-qib ya tshauv muaj qhov hloov tau zoo, thaum qib thib ob- thiab thib peb-qib ya tshauv yog qhov ua rau tsis sib haum, tshwj xeeb tshaj yog qib thib peb ya tshauv. Thaum cov hmoov tshauv tsis zoo, cov nyhuv ntawm kev ua kom ntau npaum li caspolycarboxylate superplasticizernyob rau hauv lub sij hawm tseem tsis tuaj yeem txhim kho tau zoo. Qhov laj thawj tseem ceeb ntawm qhov tshwm sim no yog tias cov ntsiab lus ntawm cov pa roj carbon monoxide ntawm theem nrab thiab tertiary ya tshauv nrog cov hluav taws xob ntau dua yog qhov loj dua, thiab lub peev xwm adsorption ntawm carbon hais rau admixtures loj, yog li txo cov adsorption ntawm admixtures rau cement, cuam tshuam rau cov pob zeb fluidity. Thaum siv qib III ya tshauv, nce cov ntsiab lus ntawm polycarboxylate dej reducer ntau dua 50%, thiaj li ua tiav cov dej txo tus nqi thaum sib tov qib ib ya tshauv. Nyob rau hauv lub ntsej muag ntawm ya tshauv hnub no nrog complex zoo thiab txawv Cheebtsam, nws yog tsim nyog los ntxiv dag zog rau kev tswj zoo ntawm ya tshauv thiab ntxiv dag zog rau qhov kev xeem thaum siv. polycarboxylate superplasticizer.