Dab tsi yog qhov ua tau zoo ntawm cov dej txo qis?

Admixtures uas tuaj yeem txo qhov sib xyaw dej hauv qhov xwm txheej uas cov pob zeb poob qis yog qhov zoo ib yam yog hu ua high-efficiency dej-txo admixtures.
Ib qho kev sib xyaw uas tuaj yeem txo cov kev sib xyaw dej ntau dua 15% thaum cov pob zeb poob qis yog qhov zoo ib yam.
--Tau los ntawm DL/T5100-2014 "Technical Specifications for Hydraulic Concrete Admixtures"
Keeb kwm kev loj hlob
Thawj tiam ntawm cov dej-txo cov neeg ua haujlwm siab-naphthyl-based high-efficiency dej-txo cov neeg ua haujlwm thiab melamine resin-based high-efficiency dej-txo cov neeg ua haujlwm tau tsim nyob rau xyoo 1960s. Vim lawv cov kev ua tau zoo piv nrog cov dej-txo cov neeg ua haujlwm zoo tib yam-cov naphthyl-based superplasticizers tsim nyob rau xyoo 1930s Sawv cev los ntawm lignin sulfonate - nws tau raug kho kom zoo, yog li nws tseem hu ua superplasticizer. Qhov thib ob tiam ntawm high-efficiency dej-txo cov neeg sawv cev yog sulfamate, txawm hais tias chronologically nws yog tom qab peb-tiam high-efficiency dej-txo tus neeg saib xyuas-polycarboxylic acid system. Cov graft copolymer nrog ob pawg sulfonic acid thiab pawg carboxylic acid yog qhov tseem ceeb tshaj plaws ntawm peb tiam neeg ua haujlwm siab dej-txo tus neeg saib xyuas, thiab nws kuj yog tus neeg ua haujlwm zoo tshaj plaws ntawm cov dej-txo.