Development History Of Concrete Accelerator

Nrog rau kev nce qib hauv kev tshawb fawb ntawm cov cuab yeej siv tshuaj txau, cov txheej txheem tau hloov zuj zus los ntawm txoj kev tshuaj tsuag qhuav mus rau txoj kev ntub dej. Txawv teb chaws, kev tshawb fawb ntawm cov kua qhob accelerators pib, thiab pib tsim kua qhob accelerators muaj siab alkali ntsiab lus. Nrog rau kev tshawb fawb ntxiv, cov ntsiab lus alkali ntawm cov kua qhob accelerators maj mam txo qis, ua rau qhov tshwm sim ntawm alkali-dawb (tsawg alkali) kua qhob accelerators hauv khw. Los ntawm nruab nrab -1980s, organic-inorganic composite kua alkali-dawb (tsawg alkali) pob zeb accelerators pib tsim thiab siv. Cov organic Cheebtsam nyob rau hauv cov composite kua qhob accelerators mas muaj xws li ntau yam alkanolamines, amides, organic alcohols, carboxylic acids, thiab lwm yam, thaum lub inorganic Cheebtsam feem ntau muaj xws li txhuas sulfate. Tam sim no, nyob rau hauv cov teb chaws tsim xws li Nyiv thiab Europe, alkali-dawb (tsawg alkali) kua qhob accelerators dominate lub pob zeb accelerator lag luam.

Kev tshawb fawb ntawm pob zeb Accelerators hauv Suav teb

Tuam Tshoj txoj kev tshawb fawb ntawm pob zeb accelerators pib lig, pib thaum xyoo 1960. Cov pob zeb ua kom ntxov tshaj plaws yog cov hmoov pob zeb ua kom nrawm, xws li Hongxing I, 711, thiab 782 hom, uas muaj cov ntsiab lus alkali siab thiab lub zog tseem ceeb hauv cov theem tom qab. Nyob rau xyoo 1990, nrog rau kev qhia txog cov cuab yeej ntub dej rau Suav teb, cov kws tshawb fawb hauv tsev tau pib tsom mus rau kev tshawb fawb cov kua pob zeb ua kom nrawm. Alkali-dawb (tsawg alkali) kua qhob accelerators thiab organic-inorganic composite kua qhob accelerators pib maj mam tsim nyob rau hauv Tuam Tshoj, xws li NSA kua alkali-dawb qhob accelerator tsim los ntawm Pan Zhihua thiab MJ-2000 kua alkali -dawb pob zeb accelerator tsim los ntawm Beijing Institute of Coal Science thiab Engineering. Txawm li cas los xij, kev tshawb fawb ntawm cov kua alkali-dawb (tsawg alkali) pob zeb accelerators hauv Suav teb tseem nyob rau theem pib. Txawm hais tias muaj ntau hom khoom, lawv qhov kev ua tau zoo tag nrho yog qhov tsis sib xws, ntau yam khoom kim heev, thiab lawv qhov ruaj khov thiab kev hloov pauv tsis zoo, xav tau kev txhim kho ntxiv.

Hom Pob Tawb Accelerators

Cov kua ua kua ua kom nrawm xws li sodium silicate type, sodium aluminate type, aluminium sulfate type, thiab aluminium potassium sulfate type. Ntawm lawv, sodium silicate hom kua qhob accelerators feem ntau yog tsim los ntawm iav dej (Na2SiO3) thiab ua ke nrog cov poov tshuaj dichromate, sodium nitrite, thiab triethanolamine, ua rau muaj alkalinity siab. Sodium aluminate muaj siab solubility hauv dej thiab muaj zog alkaline, ua rau nws ua alkaline pob zeb accelerator. Alkali-dawb (tsawg alkali) kua qhob accelerators tau categorized raws li nram no:

1. Aluminium Sulfate Hom

Aluminium sulfate hom kua qhob accelerators yog tsim los ntawm kev sib txuas cov anhydrous aluminium sulfate nrog rau lwm yam khoom, teej tug mus rau tsawg alkali kua qhob accelerators. Cov pob zeb accelerators tuaj nyob rau hauv ntau ntau yam, nrog rau qhov sib txawv tseem ceeb nyob rau hauv muaj pes tsawg leeg thiab formulation txheej txheem. Tsawg alkali kua qhob accelerators, feem ntau yog tsim los ntawm txhuas sulfate thiab sodium aluminate, muaj kev cuam tshuam me me rau tom qab lub zog ntawm cov cement thiab hloov tau zoo rau ntau hom cement. Ntawm qhov tod tes, qis alkali kua qhob accelerators ua los ntawm txhuas sulfate thiab aluminium hydroxide yooj yim cov kauj ruam ntawm kev tsim cov txhuas hydroxide thiab tom qab ntawd polymerizing aluminium sulfate, tab sis cov pob zeb accelerators muaj kev ruaj ntseg tsis zoo, nws yooj yim rau nag lossis daus thiab crystallization, thiab tsis tsim nyog. mus ntev cia. Tsis tas li ntawd, aluminium sulfate tuaj yeem sib xyaw nrog fluorides thiab magnesium sulfate los tsim cov alkali-dawb (tsawg alkali) kua qhob accelerators.

2. Aluminium Potassium Sulfate Hom

Los ntawm kev sib xyaw ua ke ntawm aluminium potassium sulfate nrog sodium fluoride, cov dej txo cov neeg ua haujlwm, thiab cov thickeners, cov kua alkali qis qis tuaj yeem tsim tau. Hom pob zeb accelerator no feem ntau suav nrog cov khoom tsis muaj alkali, xws li cov khoom tsim los ntawm Nitto Chemical Industry Co., Ltd., uas suav nrog alkali hlau sulfates lossis carbonates nrog dej-soluble txhuas ntsev.

3. Organic-Inorganic Composite Concrete Accelerators

Organic-inorganic composite qhob accelerators tuaj yeem daws tau ntau yam teeb meem cuam tshuam nrog inorganic pob zeb accelerators, xws li txo tus nqi rov qab ntawm cov pob zeb thaum lub sij hawm tsim kho los ntawm kev ua kom cov cohesion ntawm cov cement slurry. Buegre thiab lwm tus tsim cov organic-inorganic composite kua alkali-dawb qhob accelerator nrog kev ua tau zoo heev siv nitrate thiab alkanolamine ua cov khoom tseem ceeb, thiab ntxiv carboxylic acids thiab polyhydroxy compounds. Qin Lian thiab lwm tus tau tsim ib puag ncig tus phooj ywg organic-inorganic composite kua alkali-dawb qhob accelerator uas yog feem ntau ntawm sodium fluoride, triethanolamine, txhuas sulfate, thiab polyacrylamide. Nyob rau hauv no formulation, txhuas sulfate thiab sodium fluoride pab raws li ib tug tsuj roj Cheebtsam; triethanolamine sai txhim kho lub zog thaum ntxov ntawm cov cement mortar; polyacrylamide txhim kho cov pob zeb sib txuas lub zog, ua kom cov tshuaj tsuag ib zaug, txo tus nqi rov qab, txo cov tshuaj rov qab, thiab thaum kawg txo cov nqi tsim kho.

Cov yam ntxwv ntawm pob zeb Accelerators

1. Cov txheej txheem ntau lawm tsis muaj kuab paug thiab tsis muaj corrosive

Cov txheej txheem tsim cov hmoov pob zeb accelerators siv ntau cov ntaub ntawv raw thiab lub zog, tsim cov plua plav thiab cov pa roj tseem ceeb thaum sib tsoo, pelletizing, calcining, thiab ntim khoom, ua rau muaj kuab paug ib puag ncig. Liquid accelerators, txawm li cas los xij, zam cov plua plav thiab tso pa tawm, txo cov pa phem ib puag ncig. Tsis tas li ntawd, cov tsoos alkaline pob zeb accelerators tuaj yeem ua rau muaj kev cuam tshuam alkali-aggregate hauv pob zeb, ua rau muaj kev puas tsuaj loj. Nyob rau hauv sib piv, kua alkali-dawb (tsawg alkali) pob zeb accelerators feem ntau nruab nrab los yog me ntsis acidic, tsis txhob siv cov tshuaj alkaline, txo cov kev puas tsuaj rau tib neeg noj qab haus huv thiab kev puas tsuaj.

2. Tus nqi qis dua, txuag nqi

Cov kua alkali-dawb (tsawg alkali) pob zeb accelerators feem ntau muaj cov khoom uas ua rau kom cov viscosity, txo cov nqi rov qab ntawm cov pob zeb sib tov thaum tsim kho. Qhov kev txo qis no txo ​​qis cov khoom siv raw cov ntaub ntawv pov tseg, txuag cov nqi tsim kho, thiab txo cov kev phom sij rau kev noj qab haus huv cuam tshuam nrog alkaline ntub-txhaj tshuaj ua vaj tse. Feem ntau, tus nqi rov qab ntawm cov pob zeb txau nrog cov kua alkali-dawb (tsawg alkali) cov pob zeb ua kom nrawm yog nyob ib puag ncig 15%, piv rau 30% nrog cov hmoov pob zeb ua kom nrawm. Yog li, siv cov kua alkali-dawb (tsawg alkali) pob zeb accelerators zoo heev txo tus nqi rov qab thaum lub pob zeb txau, yog li txo cov nqi tsim kho.

3. High Degree ntawm Mechanization, Fast Project Progress

Cov kua alkali-dawb (tsis tshua muaj alkali) pob zeb accelerators feem ntau yog siv rau hauv cov cuab yeej ntub dej, uas muaj cov txheej txheem siab ntawm kev siv tshuab, txo qis kev siv zog ntawm kev siv thiab ua kom lub sij hawm luv luv, yog li ua kom cov phiaj xwm ua tiav.