Dej txo tus neeg sawv cev rau txoj kev daws teeb meem

High-alkali Maas
Lub soluble alkalis hauv cov ntseeg nyob rau hauv xis mas qhia raws li Na₂o sib npaug, thiab lawv feem ntau yog los ntawm cov av nplaum thiab ntxiv cov khoom siv hauv CEMENT ntau lawm. Ib qho nyiaj ntau ntawm cov alkali tau txais txiaj ntsig zoo rau kev txhawb nqa txoj cai xis thiab kev txhim kho thaum ntxov ntawm cov pob zeb. Cov ntawv xeem tau qhia tias cov fluidity ntawm cov cement qheb nce li cov ntsiab lus alkali sawv. Txawm li cas los xij, ib zaug qhov pib tau mus txog, cement hydration hydration nrawm nrawm, thiab cov cua ci ntawm cov Maas Paste txo qis. Thaum tus neeg sawv cev dej-tus neeg sawv cev dej ntxiv, cov nyhuv yas kuj tseem ceeb tshaj plaws. Qhov poob qis poob qis dua lub sijhawm thaum txo cov neeg sawv cev siv tau siv los ntawm kev npaj-sib xyaw ua ke thiab twj pob zeb ua ke. Qhov laj thawj rau cov kev tshwm sim no feem ntau suav tias yog cov alkali hauv kev ua kom tiav ntawm Trical ntawm Trical ntawm Trikinate Aluminate, uas encapsulate saum npoo ntawm c3A , inhibiting nws txoj haujlwm hydration ncaj qha rau daim calcium aluminate thiab txhim kho cov cua ntawm cov cement muab tshuaj txhuam. Txawm li cas los xij, yog tias Alkali cov ntsiab lus hauv cov ntseeg siab heev, ib qho nyiaj ntau ntawm cov ua haujlwm txo qis, thiab txo cov neeg sawv cev kom tsawg. Qhov no yog manifested li cov dej tsis txaus, cov nyhuv tshuab tsis zoo, thiab poob qis dua lub sijhawm. Thaum siv High-alkali Maas, Qualfate dej-txo cov neeg sawv cev nyiam ua tsis tau zoo. Txawm li cas los xij, siv cov neeg sawv cev dej-txo cov ncauj lus siab dua nrog cov ntsiab lus tseem ceeb ntawm sulfate) (ntau dua 20% Qhov no yog vim tias tus caso4 hauv cov dej ntws tsawg-txo cov neeg sawv cev yog tsim tawm thaum lub synthesis thiab muaj solubility zoo. Thaum cov Maas's Gypsum tseem tsis tau yaj, muaj ntau ntau ntawm cov dej uas muaj dej ntws tawm rau hauv dej. Raws li cov alkali nrawm nrawm nrawm nrawm nrawm ntawm C3A, tiv thaiv kom muaj ANTY, tiv thaiv kom tsawg ntawm cov calcium aluminate thiab txo qis qis poob. Nws yog qhov tseeb tias dej-txo cov neeg sawv cev nrog cov ntsiab lus siab sulium sulfate yog qhov yoog tau ntau dua rau high-alkali cement. Ntau cov neeg sawv cev polycarboxylate-rollated dej-txo cov neeg sawv cev muaj cov acidic retarders zoo li citric acid, lawv nyuaj rau kev hloov kho kom haum rau high-alkali cement. Qhov no yog vim tias acidic additives sai sai ua rau ib tug acid-pase kev tawm tsam nrog high-alkali cement, tso cua sov thiab ua rau muaj qhov kub ntxhov. Qhov no tsis tsuas yog ua kom nrawm dua txoj kev ntseeg rov qab tab sis kuj ua rau muaj kev voj voog viat, ua rau cov neeg tsis zoo thiab poob nrawm. Txawm li cas los xij, yog tias lwm tus neeg rov ua dua tshiab tau siv, qhov tshwm sim no yuav zam tau.

Tsawg-alkali thiab sulfate-tsis muaj hmoov xis mas
Qhov zoo tshaj plaws soluble alkali cov ntsiab lus hauv cov ntseeg yog feem ntau suav hais tias yog nruab nrab ntawm {{}} 0. 6%. 6%. Cement nrog alkali cov ntsiab lus hauv qab no 0.4% feem ntau yog xa mus rau raws li qis-alkali cement. Txij li thaum Soluble alkalis yog feem ntau tam sim no li alkali sulfates, qis-alkali xis mas tseem hu ua sulfate-muaj cai cement. Thaum cov alkali tsawg; kev ua kom sib xyaw nrog cov kais dej-txo cov neeg sawv cev, cov wangability yog feem ntau tsis zoo. Txawm hais tias nce cov tshuaj-txo cov neeg sawv cev yuav muaj qee qhov cuam tshuam, nws tseem ua rau cov khoom tsis zoo, ua rau poob qis homogeneity thiab poob nrawm. Raws li ib tug tshwm sim, feem ntau siv cov dej ntws-txo cov neeg sawv cev feem ntau tsis ua tau zoo, txawm tias qhov ntau npaum li cas nce, nrog me me. Qhov tseem ceeb vim li cas rau cov teeb meem hloov kho no yog tias tsis txaus ntseeg yog tias kev ua kom muaj kev cuam tshuam ntawm C3A. Raws li qhov tshwm sim, C3A adsorb nyhiab ntau dua cov roj ntxiv, txo cov yas ua haujlwm ntawm cov dej-txo cov neeg sawv cev. Yog li ntawd, ntxiv nrog soluble alkali (sulfate) yog qhov kev daws teeb meem zoo tshaj plaws los daws cov teeb meem zoo ntawm cov txiv ntoo uas muaj tseeb. Cov txheej txheem feem ntau ntawm kev nce ntau npaum li cas ntawm retarders tsis ua tiav cov txiaj ntsig tseem ceeb.