Yuav Siv Concrete Expansion Agent kom raug li cas?

Tshaj li kaum xyoo dhau los ntawm kev txhim kho thiab daim ntawv thov, Tuam Tshoj cov pob zeb nthuav dav tau siv dav, nrog rau tag nrho cov khoom ntawm kwv yees li 2 lab tons. Piv txwv li qhov nruab nrab npaum li cas ntawm 40 kg / m³ rau expansion agents, qhov no sib npaug rau ze li ntawm 50 lab m³ ntawm shrinkage-compensating pob zeb. Ntawm lawv, UEA cov neeg sawv cev nthuav dav suav txog li 80% ntawm tag nrho cov nyiaj. Nyob rau hauv ntau yam crack-resistant thiab impermeable engineering daim ntaub ntawv, tag nrho cov nyhuv tau zoo. Txawm li cas los xij, raws li kev siv tau nce ntxiv, qee cov kws tshaj lij thiab cov kws tshawb fawb los ntawm kev tsim qauv, kev tshawb fawb, thiab cov tsev kawm ntawv tau tshaj tawm tias cov kab nrib pleb thiab cov dej tsis sib haum hauv cov phiaj xwm shrinkage-compensating ua vaj tse tau dhau los ua ntau zaus raws li kev siv nce ntxiv, uas ua rau muaj kev saib xyuas zoo thiab cov lus qhia tau kawm. Tsuas yog los ntawm kev ua li ntawd tuaj yeem txhim kho thiab siv cov neeg sawv cev nthuav dav hauv Suav teb mus rau txoj kev noj qab haus huv.

Raws li cov xwm txheej tam sim no ntawm kev tsim cov khoom lag luam zoo ntawm cov neeg sawv cev nthuav dav hauv Suav teb thiab cov teeb meem uas muaj nyob hauv lawv cov ntawv thov engineering, suav nrog kev hloov kho cov qauv khoom thiab cov ntawv thov kev qhia tshwj xeeb, peb qhia yuav ua li cas siv cov neeg ua haujlwm nthuav dav kom zoo. Qhov no tuaj yeem ua qhov siv rau cov neeg tsim qauv, cov neeg ua haujlwm tsim kho, thiab cov neeg ua haujlwm hauv kev sib xyaw ua ke.

Yuav Ua Li Cas Xaiv Cov Neeg Ua Haujlwm nthuav dav

Lub luag haujlwm tseem ceeb ntawm cov neeg ua haujlwm nthuav dav yog txhawm rau txhawm rau txhawm rau qhov shrinkage thiab txias shrinkage thaum lub sij hawm hardening txheej txheem ntawm pob zeb. Txhawm rau txo qis kev tawg, lawv tuaj yeem siv rau ntau qhov sib tsoo-resistant thiab impermeable concretes, tshwj xeeb tshaj yog cov uas muaj feem xyuam rau cov dej tsis zoo, xws li hauv av, hydraulic, marine, subway, qhov, thiab hydropower reinforced pob zeb.

Thaum xaiv tus neeg sawv cev nthuav dav, thawj zaug xyuas seb nws puas ua tau raws li "Concrete Expansion Agents" kev lag luam tus qauv JC476-2001. Muaj peb yam tseem ceeb los xav txog:

Cov ntsiab lus alkali yuav tsum tsawg dua lossis sib npaug rau 0.75%.

Lub {{0}}hnub nthuav dav hauv dej yuav tsum siab dua lossis sib npaug li 0.025%.

Qhov ntau npaum li cas yuav tsum tsawg dua los yog sib npaug li 12% (Lub Tsev Haujlwm Saib Xyuas Kev Tsim Kho Hauv Nroog Beijing tau hais tias qhov ntau npaum li cas yuav tsum tsawg dua lossis sib npaug li 8% rau kev lag luam).

Tam sim no, ntau lub xeev thiab lub nroog tau tso tseg cov ntawv tso cai khoom, yog li kev tshuaj xyuas zoo yuav tsum tau ntxiv dag zog. Rau cov haujlwm loj, nws yog ib qho tsim nyog yuav tsum tau mus xyuas cov chaw tsim khoom ntawm tus neeg sawv cev nthuav dav los tshuaj xyuas seb nws cov txheej txheem ntau lawm thiab cov khoom siv hauv chav kuaj tau ua tiav thiab ua tiav. Cov qauv random yuav tsum tau muab coj los ntawm lub tsev rau khoom rau kev sim kom tsis txhob muaj cov khoom cuav lossis cov khoom siv tsis zoo los ntawm kev nkag mus rau hauv kev ua lag luam.

Tam sim no, muaj ze li ntawm 30 hom kev nthuav dav cov neeg sawv cev ntawm lub khw. Piv txwv li, UAA yog tsim los ntawm 25 txawv manufacturers thoob teb chaws. Txawm hais tias lub hom lag luam lossis cov chaw tsim khoom, txhua tus neeg sawv cev nthuav dav yuav tsum raug kuaj los ntawm tus neeg siv lossis tso siab rau lub chaw sab laj rau kev rov kuaj dua. Tsuas yog cov uas xeem dhau qhov kev xeem yuav tsum tau siv, thiab cov uas tsis zoo yuav tsum raug tsis lees paub. Cov neeg tsim khoom kuj tseem tuaj yeem tuav lub luag haujlwm nyiaj txiag.

Muaj peb hom expansion agents hauv Suav teb:

Calcium aluminate-based (piv txwv li, UAA, AEA, PNC, FS, PPT, thiab lwm yam).

Calcium oxide-calcium aluminate-based (piv txwv li, CEA).

Calcium oxide-raws li.

Vim muaj tshuaj lom neeg ruaj khov thiab dej tsis kam ntawm ettringite (C₃A·3CaSO₄·32H₂O), feem ntau cov tuam txhab tsim khoom hauv tsev thiab thoob ntiaj teb tsim cov tshuaj calcium aluminate-based expansion agents. CaO hydration generates Ca(OH)₂, uas ua rau expansion. Txawm li cas los xij, Ca(OH)₂ yog yooj yim soluble nyob rau hauv cov dej pressurized, yog li GBJ119 tus qauv qhia hais tias cov expansion agents uas muaj CaO yuav tsum tsis txhob siv nyob rau hauv underground, marine, los yog lwm yam dej tsis zoo tej yaam num.