Zuva Rokutumira:9,Jan,2023

Ndezvipi zvinoderedza mvura?

Mvura inoderedza (yakadai seLignosulfonates) rudzi rwemusanganiswa unowedzerwa kune kongiri panguva yekusanganiswa. Mvura inoderedza mvura inogona kuderedza huwandu hwemvura ne12-30% pasina kukanganisa kushanda kwekongiri kana simba remagetsi rekongiri (iyo yatinowanzo taura maererano nekumanikidza simba). Kune mamwe mazwi eMvura inoderedza, ayo ari Superplasticizers, plasticizers kana yakakwirira-renji mvura inoderedza (HRWR).

Mhando dzemvura-kuderedza Admixtures

Kune akawanda marudzi emvura-inoderedza admixtures. Makambani ekugadzira anopa mazita akasiyana-siyana uye zvimiro kune izvi zvakasanganiswa senge mvura-proofers, densifiers, workability aids, nezvimwe.

Kazhinji, isu tinokwanisa kupatsanura vadzikisi vemvura mumarudzi matatu zvichienderana nemakemikari avo (sezviri muTebhurari 1):

Lignosulfonates, hydroxycarboxylic acid, uye hydroxylated polymers.

Lignin inobva kupi?

Lignin chinhu chakaomarara chinomiririra ingangoita 20% yekuumbwa kwehuni. Munguva yekugadzirwa kwepepa-kugadzira pulp kubva pahuni, doro remarara rinoumbwa se-chigadzirwa chine musanganiswa wakaoma wezvinhu, zvinosanganisira kuparara kwezvinhu zve lignin uye cellulose, sulfonesheni zvigadzirwa zve lignin, akasiyana makhahydrates (shuga) uye yakasununguka sulfurous asidhi kana sulfates.

Kutevera neutralization, kunaya uye kuvirisa maitiro kunogadzira huwandu hwema lignosulfonates ekuchena kwakasiyana uye kuumbwa zvinoenderana nenhamba yezvinhu, senge neutralizing alkali, iyo pulping process inoshandiswa, dhigirii rekuvirisa uye kunyangwe rudzi uye zera rehuni rinoshandiswa se pulp feedstock.

Lignosulfonates seMvura-inoderedza muKongiri

Lignosulfonate superplasticizer dose inowanzoita 0.25 muzana, izvo zvinogona kukonzera kudzikiswa kwemvura kusvika pa9 kusvika ku12 muzana mune simende yemukati (0.20-0.30%). Sekushandiswa kwakaringana dosi, kongiri simba rakavandudzwa ne15-20% kana ichienzaniswa nereferensi kongiri. Simba rakakura ne20 kusvika ku30 muzana mushure memazuva matatu, ne15-20 muzana mushure memazuva manomwe, uye nehuwandu hwakafanana mushure memazuva makumi maviri nemasere.

Pasina kusandura mvura, kongiri inogona kuyerera yakasununguka, zvichiita kuti zvive nyore kushanda nayo (kureva kuwedzera kushanda).

Nekushandisa toni imwe ye lignosulfonate superplasticizer poda pachinzvimbo chesimende, unogona kuchengetedza matani 30–40 esimende uchichengeta kudonha kwekongiri imwechete, kusimba, uye kongiri yereferensi.

Mumamiriro ezvinhu akajairwa, kongiri yakasanganiswa nemumiririri uyu inogona kunonoka kupisa kwepamusoro kwe hydration neanopfuura maawa mashanu, nguva yekupedzisira yekongiri neanopfuura maawa matatu, uye nguva yekumisikidza kongiri inopfuura maawa matatu zvichienzaniswa nereferensi kongiri. Izvi zvinobatsira pakuvaka kwezhizha, commodity kongiri yekutakura, uye mass kongiri.

Lignosulfonate superplasticizer ine micro-entraining inogona kukwidziridza kuita kwekongiri maererano nekutonhora-kunyungudika kusamira.