Hnub Kawg: 27 Lub Ib Hlis, 2022
4. Retarder
Cov retarders tau muab faib ua cov organic retarders thiab inorganic retarders. Feem ntau ntawm cov organic retarders muaj cov nyhuv txo dej, yog li lawv kuj hu ua retarders thiab dej reducers. Tam sim no, peb feem ntau siv cov organic retarders. Organic retarders feem ntau qeeb cov dej ntawm C3A, thiab lignosulfonates tseem tuaj yeem ncua cov dej ntawm C4AF. Kev sib txawv ntawm lignosulfonates tuaj yeem pom cov khoom sib txawv thiab qee zaum ua rau muaj qhov tsis tseeb ntawm cov cement.
Cov teeb meem hauv qab no yuav tsum tau them sai sai rau thaum siv retarder hauv kev lag luam pob zeb:
A. Ua tib zoo saib xyuas kev sib raug zoo nrog cov khoom siv cementitious thiab lwm yam tshuaj sib xyaw.
B. Ua tib zoo saib xyuas qhov kev hloov ntawm qhov kub thiab txias
C. Ua tib zoo saib xyuas kev tsim kho thiab kev thauj mus los deb
D. Ua tib zoo saib xyuas qhov yuav tsum tau ua ntawm qhov project
E. Kev saib xyuas yuav tsum tau them rau kev txhawb nqa kev saib xyuas thaum twg
Cov teeb meem hauv qab no yuav tsum tau them sai sai rau thaum siv retarder hauv kev lag luam pob zeb:
A. Ua tib zoo saib xyuas kev sib raug zoo nrog cov khoom siv cementitious thiab lwm yam tshuaj sib xyaw.
B. Ua tib zoo saib xyuas qhov kev hloov ntawm qhov kub thiab txias
C. Ua tib zoo saib xyuas kev tsim kho thiab kev thauj mus los deb
D. Ua tib zoo saib xyuas qhov yuav tsum tau ua ntawm qhov project
E. Kev saib xyuas yuav tsum tau them rau kev txhawb nqa kev saib xyuas thaum twg
Sodium sulfate yog cov hmoov dawb, thiab cov tshuaj uas tsim nyog yog 0.5% mus rau 2.0%; cov nyhuv thaum ntxov tsis zoo li ntawm CaCl2. Lub zog thaum ntxov ntawm slag cement pob zeb tseem ceeb dua, tab sis tom qab lub zog txo qis me ntsis. Kev noj tshuaj ntawm sodium sulfate thaum ntxov-lub zog tus neeg sawv cev hauv cov txheej txheem prestressed yuav tsum tsis pub tshaj 1%; ntau npaum li cas ntawm cov pob zeb ua vaj tse nyob rau hauv qhov chaw ntub dej yuav tsum tsis pub tshaj 1.5%; qhov ntau npaum li cas yuav tsum tau tswj nruj me ntsis.
Kev puas tsuaj; "hoarfrost" rau ntawm pob zeb nto, cuam tshuam rau qhov tsos thiab ua tiav. Tsis tas li ntawd, sodium sulfate thaum ntxov muaj zog tus neeg sawv cev yuav tsum tsis txhob siv nyob rau hauv cov haujlwm hauv qab no:
ib. Cov qauv hauv kev sib cuag nrog cov hlau galvanized lossis txhuas hlau thiab cov qauv tsim nrog cov khoom siv hlau uas tsis muaj kev tiv thaiv.
b. Txhim kho pob zeb ua qauv ntawm cov chaw tsim khoom thiab cov chaw thauj khoom siv hluav taws xob siv hluav taws xob DC.
c. Cov vaj tse pob zeb uas muaj cov reactive aggregates.
Post lub sij hawm: Jun-27-2022
