Tsiku Lotumiza:9,Jan,2023

Kodi zochepetsera madzi ndi chiyani?

Otsitsa madzi (monga Lignosulfonates) ndi mtundu wa zosakaniza zomwe zimawonjezeredwa ku konkire panthawi yosakaniza. Ochepetsera madzi amatha kuchepetsa madzi ndi 12-30% popanda kusokoneza kugwira ntchito kwa konkire kapena mphamvu yamakina ya konkire (yomwe timakonda kufotokoza molingana ndi mphamvu yopondereza). Palinso mawu ena ochepetsa Madzi, omwe ndi Superplasticizers, plasticizers kapena high-range water reducers (HRWR).

Mitundu ya Zosakaniza zochepetsera madzi

Pali mitundu ingapo ya zosakaniza zochepetsera madzi. Makampani opanga amapereka mayina osiyanasiyana ndi magulu pazosakaniza izi monga zotsukira madzi, ma densifiers, zothandizira kugwira ntchito, ndi zina.

Nthawi zambiri, titha kugawa zochepetsera madzi m'mitundu itatu molingana ndi kapangidwe kake (monga mu Gulu 1):

Lignosulfonates, hydroxycarboxylic acid, ndi ma polima a hydroxylated.

Kodi Lignin amachokera kuti?

Lignin ndi zinthu zovuta zomwe zimayimira pafupifupi 20% ya matabwa. Panthawi yopanga mapepala opangira mapepala kuchokera ku nkhuni, mowa wotayirira umapangidwa ngati chinthu chopangidwa ndi zinthu zomwe zimakhala ndi zinthu zambiri, kuphatikizapo kuwonongeka kwa lignin ndi cellulose, mankhwala a sulfonation a lignin, zakudya zosiyanasiyana (shuga) ndi wopanda sulfure acid kapena sulfates.

Kenako neutralization, mpweya ndi nayonso mphamvu njira kubala osiyanasiyana lignosulfonates zosiyanasiyana chiyero ndi zikuchokera kutengera zinthu zingapo, monga neutralizing zamchere, ndi pulping ndondomeko ntchito, mlingo nayonso mphamvu ngakhale mtundu ndi zaka za nkhuni ntchito monga. zamkati chakudya.

Lignosulfonates monga zochepetsera madzi mu Konkire

Mlingo wa Lignosulfonate superplasticizer nthawi zambiri umakhala wa 0,25 peresenti, zomwe zingapangitse kuti madzi achepetse mpaka 9 mpaka 12 peresenti ya simenti (0.20-0.30%). Monga momwe amagwiritsidwira ntchito mulingo woyenera, mphamvu ya konkire imakula ndi 15-20% poyerekeza ndi konkire yowunikira. Mphamvu zimakula ndi 20 mpaka 30 peresenti pambuyo pa masiku atatu, ndi 15-20 peresenti pambuyo pa masiku 7, ndi kuchuluka komweko pambuyo pa masiku 28.

Popanda kusintha madzi, konkire imatha kuyenda momasuka, kupangitsa kuti ikhale yosavuta kugwira nayo ntchito (mwachitsanzo, kukulitsa luso).

Pogwiritsa ntchito tani imodzi ya ufa wa lignosulfonate superplasticizer m'malo mwa simenti, mutha kupulumutsa matani 30-40 a simenti kwinaku mukusunga kutsika kwa konkire komweko, kulimba, ndi konkriti.

Mu boma muyezo, konkire wothira wothandizila akhoza kuchedwetsa kutentha pachimake cha hydration ndi maola oposa asanu, yomaliza yoika nthawi konkire ndi maola oposa atatu, ndi kuika nthawi ya konkire kuposa maola atatu poyerekeza ndi buku konkire. Izi ndizopindulitsa pakumanga kwachilimwe, zoyendera za konkriti, komanso konkriti yayikulu.

Lignosulfonate superplasticizer yokhala ndi micro-entraining imatha kupititsa patsogolo ntchito ya konkire potengera kuzizira kwamadzi.