Hnub Kawg:30,Nov,2022

A. Dej txo tus neeg sawv cev

Ib qho tseem ceeb ntawm kev siv dej txo tus neeg sawv cev yog txhawm rau txo cov dej siv ntawm cov pob zeb thiab txhim kho cov dej ntws ntawm cov pob zeb hauv qab cov xwm txheej ntawm kev ua kom cov dej sib piv tsis hloov, kom ua tau raws li cov kev cai ntawm kev thauj mus los thiab kev tsim kho. Feem ntau cov dej txo cov tshuaj sib tov muaj cov tshuaj saturated. Yog tias qhov ntau npaum li cas saturated, cov dej txo qis yuav tsis nce, thiab los ntshav thiab cais tawm yuav tshwm sim. Qhov ntau npaum saturated muaj feem xyuam rau ob qho tib si cov khoom siv raw thiab cov pob zeb sib xyaw ua ke.

 

1. Naphthalene superplasticizer

Naphthalene superplasticizertuaj yeem muab faib ua cov khoom siv siab (Na2SO4 cov ntsiab lus <3%), cov khoom nruab nrab concentration (Na2SO4 cov ntsiab lus 3% ~ 10%) thiab cov khoom siv qis (Na2SO4 cov ntsiab lus> 10%) raws li cov ntsiab lus ntawm Na2SO4. Qhov ntau npaum li cas ntawm naphthalene series dej reducer: cov hmoov yog 0.5 ~ 1.0% ntawm cov cement loj; Cov ntsiab lus ntawm cov tshuaj yog feem ntau 38% ~ 40%, qhov sib tov yog 1.5% ~ 2.5% ntawm cov cement zoo, thiab cov dej txo yog 18% ~ 25%. Naphthalene series dej reducer tsis tuaj yeem los ntshav, thiab muaj kev cuam tshuam me ntsis rau lub sijhawm teeb tsa. Nws tuaj yeem sib xyaw nrog sodium gluconate, suab thaj, hydroxycarboxylic acid thiab ntsev, citric acid thiab inorganic retarder, thiab nrog tus nqi tsim nyog ntawm huab cua nkag mus, kev poob qis tuaj yeem tswj tau zoo. Qhov tsis zoo ntawm cov concentration tsawg naphthalene series dej reducer yog cov ntsiab lus ntawm sodium sulfate loj. Thaum qhov kub qis dua 15 ℃, sodium sulfate crystallization tshwm sim.

 

2. Polycarboxylic acid superplasticizer

Polycarboxylic aciddej reducer yog suav tias yog tiam tshiab ntawm kev ua haujlwm siab dej reducer, thiab tib neeg ib txwm cia siab tias nws yuav muaj kev nyab xeeb dua, muaj txiaj ntsig zoo thiab hloov tau ntau dua li cov tshuaj naphthalene series dej reducer hauv daim ntawv thov. Qhov kev ua tau zoo ntawm polycarboxylic acid hom dej txo tus neeg sawv cev yog qhov tseem ceeb hauv: tsawg npaum li cas (0.15% ~ 0.25% (hloov cov khib nyiab), cov dej txo qis (feem ntau 25% ~ 35%), zoo slump tuav, qis shrinkage, qee qhov cua entrainment, thiab tsis tshua muaj tag nrho cov ntsiab lus alkali.

Txawm li cas los xij, hauv kev xyaum,polycarboxylic aciddej reducer kuj yuav ntsib qee qhov teeb meem, xws li: 1. Cov dej txo cov nyhuv yog nyob ntawm cov khoom siv raw thiab sib xyaw ua ke ntawm cov pob zeb, thiab cuam tshuam zoo heev los ntawm cov ntsiab lus ntawm cov xuab zeb thiab pob zeb thiab cov ntxhia hauv cov khoom sib xyaw; 2. Cov dej txo thiab slump tuav cov teebmeem yog nyob ntawm ntau npaum li cas ntawm cov dej txo tus neeg sawv cev, thiab nws yog ib qho nyuaj rau kev tswj cov slump nrog tsawg npaum li cas; 3. Kev siv cov khoom siv siab lossis lub zog siab ua vaj tse muaj qhov sib xyaw ua ke ntau, uas yog rhiab heev rau kev siv dej, thiab kev hloov pauv me me ntawm kev siv dej yuav ua rau muaj kev hloov loj hauv kev poob; 4. Muaj teeb meem compatibility nrog rau lwm hom dej txo cov neeg ua hauj lwm thiab lwm yam admixtures, los yog txawm tsis muaj superposition nyhuv; 5. Qee lub sij hawm cov pob zeb muaj cov dej los ntshav loj, muaj huab cua loj, thiab cov npuas loj thiab ntau yam; 6. Qee lub sij hawm hloov kub yuav cuam tshuam cov nyhuv ntawmpolycarboxylic aciddej reducer.

Cov yam ntxwv cuam tshuam rau kev sib raug zoo ntawm cov cement thiabpolycarboxylic aciddej reducer: 1. Qhov piv ntawm C3A / C4AF thiab C3S / C2S nce, kev sib raug zoo txo ​​qis, C3A nce, thiab cov dej siv ntawm cov pob zeb nce. Thaum nws cov ntsiab lus ntau dua 8%, qhov poob qis ntawm pob zeb nce ntxiv; 2. Cov ntsiab lus alkali loj dhau lossis me dhau yuav ua rau muaj kev cuam tshuam rau lawv cov kev sib raug zoo; 3. Qhov tsis zoo ntawm cov cement admixture kuj yuav cuam tshuam rau kev sib raug zoo ntawm ob qho tib si; 4. Cov ntawv sib txawv gypsum; 5. Qhov kub thiab txias ntawm cement yuav ua rau kom ceev ceev thaum kub tshaj 80 ℃; 6. Cov cement tshiab muaj cov khoom siv hluav taws xob muaj zog thiab muaj peev xwm nqus tau cov dej reducer; 7. Qhov chaw tshwj xeeb ntawm cov cement.