Cov khoom ntawm polycarboxylic superplasticizer thiab nws daim ntawv thov hauv engineering

1. Kev ua tau zoo ntawm Polycarboxylic Superplasticizers

Polycarboxylic high-efficiency superplasticizers yog siab molecular hnyav tshuaj synthesis khoom. Lawv cov txheej txheem tseem ceeb suav nrog esterification, graft copolymerization, thiab kev hloov kho ntawm cov khoom pH thiab ntom. Cov khoom siv tseem ceeb muaj xws li methacrylic acid, methyl methacrylate, maleic acid, polyethylene glycol allyl sulfonate, thiab methallyl sulfonate. Raws li kev nqis tes ua ntawm cov neeg pib xws li ammonium persulfate thiab sodium persulfate, polymerization tshwm sim. Tag nrho cov txheej txheem tshuaj ua tsis muaj los ntawm cov khoom, ua rau nws ib puag ncig tus phooj ywg superplasticizer. Cov dej txo tus nqi ntawm cov pob zeb yog ntau dua 25%, nrog rau kev poob qis dua li ntawm 2- teev lub sij hawm tseem tsis tau hloov pauv. Cov chloride ion thiab alkali cov ntsiab lus yog tsawg, thiab tus nqi shrinkage yog tsawg. Nws yog qhov kev ntsuas zoo tshaj plaws rau kev txhim kho thiab kev siv cov khoom siv hluav taws xob ultra-fine active admixtures thiab cov pob zeb ua haujlwm siab.

1.1 Homogeneity ntawm Polycarboxylic Superplasticizers

Polycarboxylic superplasticizers yog categorized raws li lawv cov ntsiab lus khoom, muaj nyob rau hauv 20% los yog 40% khoom concentration. Raws li qhov xav tau ntawm daim ntawv thov, 20% cov khoom siv concentration yog tam sim no siv dav hauv kev ua lag luam.

1.2 Kev ua tau zoo ntawm Polycarboxylic Superplasticizers hauv pob zeb

Polycarboxylic superplasticizers muab cov dej txo qis tshaj 25%, ua kom lub zog ntawm cov pob zeb ua rau ntau lub hnub nyoog, tshwj xeeb tshaj yog tom qab lub hnub nyoog muaj zog, thaum nthuav tawm cov nqi qis dua piv rau naphthalene-based high-efficiency water reducers. Nws cov tsos yog cov tshuaj yej xim, tsis muaj ntxhiab, tsis qab, thiab tsis muaj sediment, nrog cov ntsiab lus chloride thiab alkali tsawg. Nws muaj qhov nro ntawm qhov chaw qis thiab qee qhov huab cua nkag. Txhawm rau daws cov teeb meem huab cua nkag, qee qhov nyiaj ntawm defoamer tuaj yeem raug ntxiv los kho thiab txo cov khoom cua cov ntsiab lus.

2. Daim ntawv thov ntawm Polycarboxylic Superplasticizers hauv Engineering

Nrog rau cov cuab yeej tsim khoom lag luam thiab kev tsim khoom loj ntawm polycarboxylic high-efficiency superplasticizers, lawv daim ntawv thov hauv kev siv tshuab ua haujlwm tau nce zuj zus, suav nrog thaj chaw xws li kev txuag dej, txoj kev thiab choj engineering, kev tsim kho kev tsheb ciav hlau ceev, thermal zog engineering, municipal engineering, thiab kev lag luam pob zeb. Lawv tshwj xeeb tshaj yog zoo nyob rau hauv high-qib thiab pumped pob zeb daim ntaub ntawv vim lawv cov dej txo, siab zog, thiab zoo heev tiv thaiv zog. Tuam Tshoj muaj kev lag luam loj heev, siv ib nrab ntawm lub ntiaj teb cov cement ntau lawm. Nyob rau hauv xyoo tas los no, Tuam Tshoj txoj kev tsim kho vaj tse tau tsim kho sai, nrog ntau lub tsev loj, kev tsim kho loj, thiab kev tsim hluav taws xob hluav taws xob tau tshwm sim. Cov txheej txheem kev tsim kho thiab kev ua tiav kev ua tau zoo rau cov pob zeb tau dhau los ua nruj heev. Muaj ntau qhov xwm txheej, cov khoom siv dej ua kom muaj txiaj ntsig zoo tsis tuaj yeem ua tau raws li cov kev xav tau ntawm engineering, xws li cov qauv kev nyab xeeb siab, cov pob zeb ua rau nws tus kheej, thiab cov pob zeb ua haujlwm siab. Nyob rau ntawm no, polycarboxylic high-performance superplasticizers qhia tshwj xeeb kev ua tau zoo. Tsis tas li ntawd, vim qhov ua tau zoo ntawm polycarboxylic superplasticizers, ntau qhov loj lossis tseem ceeb hauv tsev tau txais cov khoom no. Tsis tas li ntawd, los ntawm kev sib koom tes ntawm Suav kev tshawb fawb thiab kev tsim kho cov koom haum, cov koom haum tshawb fawb tshawb fawb, thiab cov tuam txhab admixture muaj feem cuam tshuam, cov teeb meem thiab kev tsis sib haum xeeb hauv cov txheej txheem tsim khoom tau kov yeej. Tam sim no, kev ua tau zoo ntawm peb cov khoom siv polycarboxylic superplasticizer yog piv rau cov khoom txawv teb chaws thiab tau ua tiav hauv ntau qhov haujlwm loj, suav nrog Shanghai Maglev Project, Hangzhou Bay Choj, Peb Gorges Project, Jinping Hydropower Station, Capital Airport expansion, Beijing- Tianjin Intercity Rapid Railway, thiab Xiluodu Hydropower Station. Ntawm cov tuam txhab tsim khoom hauv tsev polycarboxylic, Hebei xeev cov khoom siv sib xyaw ua ke yog qhov ntxov hauv kev tshawb fawb thiab kev tsim khoom. DH13 carboxylic high-efficiency superplasticizer yog ib qho ntawm cov khoom siv ntxiv uas tsim los ntawm lub Hoobkas no. Cov khoom lag luam nthuav tawm kev ua haujlwm zoo thiab ruaj khov thiab tuaj yeem ua tau raws li qhov xav tau ntawm kev sib txawv engineering technical specifications los ntawm ntau yam kev sib txuas thiab batching txoj kev. Nyob rau hauv xyoo tas los no, tej yaam num xws li South-to-North Water Diversion Project, high-speed railways, hydropower, thiab kev lag luam pob zeb tau siv dav, ua tiav cov txiaj ntsig zoo. Hauv qab no yog cov piv txwv yooj yim qhia txog cov khoom siv hauv cov haujlwm tiag tiag (cov khoom lag luam concentration yog 20%).

2.1 Polycarboxylic Superplasticizers rau High-Strength Concrete Projects

Lub zog ntawm pob zeb yog nyob ntawm qhov sib piv ntawm cov dej-cement; qhov qis ntawm cov dej-cement piv, qhov siab dua cov pob zeb muaj zog. Vim tias cov dej txo qis ntawm polycarboxylic high-performance superplasticizers, tus nqi ntawm cov dej sib xyaw ua ke tuaj yeem txo qis, tso cai rau kev siv dej thiab lwm yam kev cai rau C50 thiab C60 high-strength pob zeb.

2.2 Zoo Slump Retention Effect ntawm Polycarboxylic Superplasticizers

Polycarboxylic high-performance superplasticizers muaj cov txiaj ntsig zoo ntawm kev tswj xyuas qhov poob ntawm cov pob zeb, tshwj xeeb tshaj yog nyob rau hauv cov twj tso kua mis, uas yuav luag tsis poob. Qhov no muaj feem xyuam rau nws cov qauv molecular tshwj xeeb, uas muab cov pob zeb ua haujlwm zoo thiab khaws cia slump. Tsis tas li ntawd, nyob ntawm seb hom yas lossis xuab zeb siv, txawm tias qhov kub thiab txias hauv lub caij nplooj zeeg thiab lub caij ntuj no, cov khoom siv lub sij hawm yuav luag tsis muaj kev cuam tshuam thaum ua ke nrog cov khoom siv los tiv thaiv corrosion.