Superplasticizer (I)

Tsiku Lomaliza Ntchito: 9 May, 2022

(一) Kusinthasintha kwapolycarboxylate superplasticizer ndi zida za simenti:

Pochita, zapezeka kutiPolycarboxylate Superplasticizerali ndi zovuta zodziwikiratu zosinthika ku simenti zosiyanasiyana ndi mitundu yosiyanasiyana ya zosakaniza zamchere, ndipo nthawi zina zimakhala zosankha kwambiri. Kusinthasintha pakati pa simenti ndipolycarboxylate superplasticizer zidzakhudzidwa ndi zinthu zambiri. Monga: zigawo za simenti, malo enieni, alkali, zinthu za gypsum ndi mitundu yonse ya zinthu zomwe zimakhudza kusintha kwaPolycarboxylate Superplasticizer.

Malo ochulukira aPolycarboxylate Superplasticizerkwa simenti yosiyana ndi yosiyana, kuchepetsa kuchepetsa madzi kumachepetsedwa, kutayika kwa konkire kumawonjezeka, zochitika za "zotsalira za nyemba za nyemba" zimawonekera pamene konkire ilibe slurry, ndi mavuto a magazi, sedimentation ndi tsankho, ndi kuvutika kupopera. , Kumverera kwa mlingo, konkire singakhoze kutsegulidwa kapena kumasulidwa mopitirira muyeso. Mwachitsanzo, zomwe zili mupolycarboxylate superplasticizer kwa simenti A ndi 1.8% (zolimba za 10%) kuti apeze malo okhutiritsa, pamene simenti ya B iyenera kusakanikirana ndi 2.2% kuti ikhale yabwino, ndipo nthawi zina ikadutsa 2.2% % ya mlingo, kusakaniza konkire. sachedwa kutaya magazi.

Pakali pano, ponena za kusinthasintha kwaPolycarboxylate Superplasticizer, mayankho ake ndi awa:

(1) Pamalo owonetsetsa mphamvu ya konkire, posintha mlingo wa mchenga, kukula kwa chiŵerengero cha coarse aggregate, ndikuwonjezera kuchuluka kwa konkriti dongosolo slurry;

(2) Mowa wamayi umaphatikizidwa ndi ether lipids ndipo mlingo umakulitsidwa moyenerera. Kawirikawiri, tikulimbikitsidwa kuti ethers ndi lipids 5: 5 zikhale ndi zotsatira zabwino, ndipo mlingo uyenera kuwonjezeka ndi 0,2%;

(3) Moyenera kuwonjezera kapena kusintha zigawo zake, ntchito mpweya-entraining wothandizila monga SJ, Degussa DY, thovu stabilizer AR, K12, kuonjezera chiwerengero cha slump-kusunga wothandizira, ntchito sodium gluconate, shuga, mankwala, ATMP, citric acid , wowuma wosinthidwa ndi zinthu zina zobwezeretsanso, pogwiritsa ntchito sungunuka wa cellulose, xanthan chingamu, dextrin, wothira wosungunuka, kapena kuwonjezera "sulfure" kapena "alkali" ku konkire zitha kusintha;

(4) Sinthani kapangidwe ka maselo a polycarboxylic acid, ndikusintha magawo ena mu kaphatikizidwe kake kuti musinthe kusinthika kwake.

Kwa admixtures, chikoka cha ntchentche phulusa mwachiwonekere ndi chachikulu kuposa cha ufa wa slag. Nthawi zambiri, phulusa la ntchentche la kalasi yoyamba limatha kusinthika, pomwe phulusa la ntchentche la kalasi yachiwiri ndi lachitatu limakonda kusagwirizana, makamaka phulusa lachitatu la ntchentche. Pamene phulusa khalidwe ndi osauka, zotsatira za kuwonjezeka mlingo wapolycarboxylate superplasticizerm'kupita kwa nthawi sikungawonjezeke kwambiri. Chifukwa chachikulu chodabwitsa ichi ndi kuti mpweya zili yachiwiri ndi tertiary ntchentche phulusa ndi apamwamba poyatsira imfa ndi lalikulu, ndi adsorption mphamvu mpweya particles kuti admixtures ndi lalikulu, potero kuchepetsa adsorption wa admixtures kuti simenti, okhudza Konkire fluidity. Mukamagwiritsa ntchito phulusa la ntchentche la kalasi yachitatu, onjezerani zochepetsera madzi a polycarboxylate ndi 50%, kuti mukwaniritse kuchepetsa madzi mukasakaniza phulusa la ntchentche la kalasi imodzi. Pamaso pa masiku ano ntchentche phulusa ndi khalidwe zovuta ndi zigawo zosiyanasiyana, m`pofunika kulimbikitsa ulamuliro khalidwe la ntchentche phulusa ndi kulimbikitsa mayeso ntchito. polycarboxylate superplasticizer.