Dab tsi yog Concrete Accelerator

Nyob rau hauv kev tsim kho ntawm niaj hnub tunnel engineering, shotcrete yog ib qho tseem ceeb lav kom ntseeg tau tias kev tsim kho ceev, thiab accelerating tus neeg saib xyuas yog tus yuam sij ntawm shotcrete technology. Concrete accelerator yog ib qho admixture uas tuaj yeem ua cov pob zeb tsim thiab tawv sai sai.Cov hom tseem ceeb yog cov ntsev inorganic thiab cov organic.Powdery khoom., nws npaum li cas xwb account rau 2% ~ 3% ntawm cov ntsiab lus cement hauv pob zeb, tab sis tuaj yeem ua pob zeb hauv 5min pib qhov chaw, pob zeb accelerator nyob rau hauv 12min qhov chaw.Yuav kom ua tiav lub hom phiaj ntawm kev kho thaum muaj xwm ceev los yog ceev ceev ntawm pob zeb nyob rau hauv lub ncej.Nws yog ib tug indispensable additive nyob rau hauv txhaj tshuaj tiv thaiv txoj kev., tsim kom muaj zog txaus nyob rau hauv lub sij hawm luv luv los xyuas kom meej cov kev cai tshwj xeeb ntawm kev tsim kho.

Cov qeb loj:

1. Hydroxide ntawm alkali ntiaj teb hlau carbonate thiab alkali ntiaj teb hlau

Powdery alkaline ntiaj teb hlau carbonates los yog hydroxides tsis tshua muaj siv nyob rau hauv shotcrete tsim ua ntej.Lawv yog cov feem ntau siv accelerators ntawm hom pob zeb no, nrog ib tug pa ntau npaum ntawm 2.5% rau 6% ntawm qhov hnyav ntawm cov cement. Lawv feem ntau txhawb cov dej ntawm C3S.Ntaus ntxiv me me ntawm txhuas carbonate, tuaj yeem cuam tshuam rau lub sijhawm teeb tsa ntawm cement.Txawm li cas los xij, Cov teebmeem tsuas tuaj yeem pom thaum cov koob tshuaj loj ntxiv.Cov tshuaj tiv thaiv ntawm cov accelerator thiab cov cement feem ntau cuam tshuam los ntawm cov tshuaj lom neeg cement, kev zoo, mineral additives thiab ambient kub.

2. Alkali silicate, sodium silicate, poov tshuaj silicate accelerator

Feem ntau yog siv rau ntub sib tov shotcrete, lawv feem ntau yog kua, thiab ntau qhov sib xyaw (> 10% cementitious khoom hnyav).Lub soluble silicate precipitates raws li qhov tshwm sim ntawm cov tshuaj tiv thaiv rau daim ntawv calcium silicate.Thaum siv ntau npaum, cov coagulants no txo ​​cov adhesion quab yuam nrog lub hauv paus, thiab thaum kawg, ua rau qhov poob ntawm cov pob zeb ua kom muaj zog thiab hnyav qhuav shrinkage.Vim cov laj thawj no, qhov ntau npaum li cas ntawm no accelerator tsis tshaj 15%, thiab qhov kawg lub zog poob yog txwv kom tsawg dua 30%.

3. Sodium aluminate, poov tshuaj aluminate, aluminate qhob accelerator

Yuav siv tau qhuav mix lawm, tuaj yeem siv cov dej sib tov sib xyaw ua ke dua, nquag siv ntau npaum yog 2.5% ~ 5.5% Feem ntau.Potassium aluminate muaj cov nyhuv zoo dua li sodium aluminate, tab sis nws kuj raug nqi ntau dua.Lawv feem ntau ncaj qha mus rau hydration ntawm Portland cement thiab ceev qhov chaw ntawm cov cement., khi nrog gypsum, tiv thaiv kev tsim ntawm ettringite rau saum npoo ntawm cov cement hais, thiab ua rau C3A teb tam sim ntawd, ua lub zog thawj zaug yuav tsum tau rau feem ntau shotcrete.Lawv cov teebmeem feem ntau cuam tshuam los ntawm cov tshuaj muaj pes tsawg leeg, fineness ntawm cov cement thiab mineral additives nws muaj, tab sis cov nyhuv no me dua li qhov pom nrog carbonate additives.Qhov kawg lub zog yuav poob los ntawm 20% mus txog 25% Tsis muaj kev tsis ntseeg tias aluminate accelerating tus neeg sawv cev muaj qhov zoo tshaj plaws daim ntawv thov nyhuv nyob rau hauv ntub sib xyaw shotcrete engineering thiab muaj kev tsim kho zoo ntawm cov tuab hauv ob sab phlu board thiab txawm lub ru tsev board.Txawm li cas los xij., nws cov ntsiab lus alkali siab thiab muaj kev phom sij rau kev noj qab haus huv los ntawm kev tsim kho hauv av yog qhov tseem ceeb txwv tsis pub nws daim ntawv thov., muaj qee qhov teeb meem hauv engineering daim ntawv thov ntawm sulfuric acid thiab active aggregate, tom kawg yuav tshwm sim alkali aggregate cov tshuaj tiv thaiv.

4. Alkali dawb kua qhob accelerator

Ua kua alkali – dawb accelerator, nws daim ntawv thov Scope tsis yog heev uas nws kim heev.Qhov no hom ntawm coagulant yuav daws tau tej yam teeb meem ntawm alkaline accelerator, xws li kev puas tsuaj rau kev tsim kho hauv av, kev puas tsuaj rau alkali aggregate cov tshuaj tiv thaiv, qhov teeb meem rau siab pH tus nqi nyob rau hauv cov txheej txheem siv thiab poob ntawm lig zog ntawm shotcrete.

Cie-China.org yog tus thawj coj ua npuas dej ua ke muab kev pabcuam ua npuas ncauj ua npuas ncauj, superplasticizer,ua npuas ncauj qhob zog enhancer rau lub teeb yuag pob zeb, CLC blocks. Yog koj tab tom nrhiav superplasticizer, thov koj txhob xav li cas tiv tauj peb.