Dab tsi yog pob zeb accelerator? Ib co tswv yim tswv yim

Accelerators muaj nyob rau hauv ntau hom, uas feem ntau tuaj yeem muab faib ua plaub pawg raws li lawv cov khoom thiab cov xeev: alkaline hmoov, tsis-alkaline hmoov, alkaline kua, thiab tsis-alkaline kua.

1. Teeb meem nrog cov tsoos Alkaline Accelerators

Alkaline hmoov thiab alkaline kua accelerators, feem ntau hu ua "tseem ceeb accelerators," muaj ob peb yam tseem ceeb:

Qhov tseem ceeb poob ntawm lub zog tom qab-theem.

Cov ntsiab lus alkali siab, uas tuaj yeem ua rau cov neeg ua haujlwm tsim kho, ua mob rau lawv txoj kev noj qab haus huv, thiab tseem tuaj yeem ua rau alkali-tag nrho cov tshuaj tiv thaiv hauv pob zeb, txo nws lub zog thiab kav ntev.

Cov plua plav ntau ntau thiab rov ua dua.

Incompatibility nrog ntub-mix shotcrete ua haujlwm.

Tsis yog-alkaline hmoov accelerators, thaum muaj cov ntsiab lus alkali qis, feem ntau ntsib cov teeb meem ntawm qhov tsis sib xws thiab cov plua plav ntau dhau thaum tsim kho. Nyob rau hauv xyoo tas los no, kev tshawb fawb thiab kev siv cov tshuaj alkaline hmoov accelerators tau maj mam txo qis.

2. Non-Alkaline Liquid Accelerators: Lub Cim Tshiab

Non-alkaline (low-alkaline) kua qhob accelerators, feem ntau hu ua "new-generation accelerators," zoo daws cov teeb meem cuam tshuam nrog high-alkaline hmoov accelerators thiab maj mam hloov cov tsoos high-alkaline hmoov accelerators.

Nyob rau hauv Suav teb, tsis-alkaline (low-alkaline) accelerators feem ntau yog tsim los ntawmAl₂O₃, CaO, SiO₂, Al₂(SO₄)₃, and Ca(OH)₂.Tsawg-alkaline accelerator8604yog tsim los ntawmAl₂O₃, Al₂(SO₄)₃, Ca(OH)₂, NaAlO₂, and α-SiO₂.Nws muaj pH tus nqi ntawm 7-8 thiab tsis muaj tshuaj lom thiab tsis muaj corrosive. Thaum ntxiv, nws muab cov cement paste nrog kev sib koom ua ke zoo heev, txo qis rov qab, txo cov plua plav, thiab ua kom cov tuab ntawm ib txheej txheej. Ntawm qhov ntau npaum li cas ntawm 4%-6%, lub sijhawm pib ntawm cov cement paste yog li 2 feeb, thaum lub sijhawm teem sijhawm kawg nws txawv nyob ntawm seb hom cement. Lub 28-hnub compressive zog tuav tus nqi siab tshaj 90%. Txawm li cas los xij, hom accelerator no muaj qhov tsis zoo ntawm lub zog thaum ntxov, nrog rau 1- hnub compressive zog ntawm tsuas yog 6 MPa. Cov khoom zoo sib xws muaj xws li covAC-type acceleratortsim los ntawm Changsha Mining Research Institute thiabMJ-2000 non-alkaline acceleratortsim los ntawm Beijing Coal Mining Institute ntawm Tuam Tshoj Coal Research Institute.

3. Mineral-based Non-Alkaline Hmoov Accelerators

Qee cov tsis-alkaline hmoov accelerators siv cov ntxhia hauv lub zog thaum ntxov ua cov khoom ua kom nrawm. Cov accelerators no yog tsim los ntawm limestone, bauxite, fluxing agents (CaF₂), thiab tshuaj reagents los tsim cov cement-mineral-based non-alkaline accelerators. Cov khoom tseem ceeb suav nrogC₁₂A₇thiabC₁₁A₇·CaF₂.Ntawm qhov ntau npaum ntawm 8%, lub sijhawm pib ntawm cov cement paste yog tsawg dua 2 feeb. Thaum ua ke nrog me me ntawm cov txiv qaub, cov nyhuv acceleration txhim kho ntxiv.

Kev tshawb fawb los ntawm Min Panrong et al. koom nrog kev sib xyaw calcium- thiab aluminium-raws li raw cov ntaub ntawv nyob rau hauv haum proportions, cua sov lawv, sib tsoo rau hauv cov hmoov, thiab ntxiv tsim nyog admixtures rau synthesize ib tug cement-mineral-based accelerator. Ntawm qhov ntau npaum ntawm 4%-6%, cov cement paste ua tiav lub sijhawm pib ntawm tsawg dua 5 feeb thiab lub sijhawm teem sijhawm kawg tsawg dua 10 feeb. Tsis tas li ntawd, 28-hnub flexural zog ntawm cov cement mortar nce 15%, thiab lub zog compressive nce 10%. Cov pob zeb sib xyaw nrog cov accelerator no nthuav tawm 10% -25% kev txhim kho hauv 28- hnub compressive zog. Txawm li cas los xij, cov accelerators xav tau ntau npaum li cas, koom nrog kev kub siab calcination, uas siv lub zog loj thiab nce nqi, thiab tseem nyob hauv cov hmoov hmoov.

4. Organic-Inorganic Composite Accelerators

Nyob rau hauv Suav teb, organic superplasticizers thiab triethanolamine tau ntxiv rau inorganic accelerating Cheebtsam los txhim khu kev ua hauj lwm ntawm shotcrete thiab txhim kho nws thaum ntxov lub zog. Qhov Kev Ua Tau Zoo Tshaj Plaws Tsis Zoo Dej Txhaum Cai Accelerator tsim los ntawm Tuam Tshoj Railway Tunnel Group Research Institute muaj cov alumina clinker, cov ntaub ntawv muab tub lim, thiab cov khoom siv ntxiv. Cov khoom siv muab tub lim yog ya tshauv, thaum cov khoom siv ntxiv muaj xws liFDN (naphthalene sulfonate formaldehyde condensate)superplasticizer thiab triethanolamine. Lub accelerator muaj pes tsawg leeg yogalumina clinker: FDN: triethanolamine: ya tshauv=52.7:10:1:36.3.Ntawm qhov ntau npaum ntawm 3%, lub sijhawm pib pib yog kwv yees li 2 feeb, thiab lub sijhawm teem sijhawm kawg yog li 5 feeb. Lub 28-hnub compressive zog tuav tus nqi yog li ntawm 87% mus rau 92%.

5. Tsis-Alkaline kua Accelerators

Kev tshawb fawb ntawm cov kua accelerators uas tsis yog-alkaline nyob rau hauv Suav teb pib ib txhij nrog non-alkaline thiab organic-inorganic composite accelerators. Txawm li cas los xij, lawv cov kev sib xyaw thiab cov txheej txheem kev txhim kho tseem tsis tau tshaj tawm. Cov kua qaub qis-alkaline accelerators tsim los ntawm Chongqing Borida Building Materials Co., Ltd.Hom 1thiabHom 2cov khoom.

Hom 1:Ntawm qhov ntau npaum ntawm 5%, lub sijhawm pib ntawm cov cement paste yog 3 feeb, thiab lub sijhawm teem kawg yog 5 feeb 30 vib nas this. Lub sijhawm 1-hnub, 3-hnub, thiab 28-hnub compressive zog ntawm cov cement mortar yog 18.1 MPa, 45.4 MPa, thiab 55.9 MPa, feem.

Hom 2:Qhov no accelerator yog milky dawb. Ntawm qhov ntau npaum ntawm 7%, nws ua tiav lub sijhawm pib ntawm 3 feeb thiab lub sijhawm teem sijhawm kawg ntawm 10 feeb. Lub sijhawm 1-hnub, 3-hnub, thiab 28-hnub compressive zog ntawm cement mortar yog 19.8 MPa, 32.7 MPa, thiab 53.0 MPa, feem.