Accelerating admixtures rau pob zeb yog cov tshuaj additives uas yog siv los ua kom ceev cov txheej txheem thiab hardening ntawm pob zeb. Cov khoom sib xyaw no tshwj xeeb tshaj yog muaj txiaj ntsig zoo nyob rau hauv txias txias los yog nyob rau hauv cov xwm txheej uas cov pob zeb yuav tsum tau teem sai sai, xws li nyob rau hauv cov ntaub ntawv ntawm kev kho thaum muaj xwm ceev los yog lub sij hawm-sensitive tej yaam num.

Muaj ob lub ntsiab ntawm kev sib xyaw ua kom nrawm rau pob zeb: chloride-based thiab non-chloride-based. chloride-raws li admixtures, uas feem ntau muaj calcium chloride los yog sodium chloride, yog cov khoom siv ntau tshaj plaws thiab siv tau zoo. Txawm li cas los xij, vim tias lawv muaj peev xwm ua rau corrosion ntawm steel reinforcement, lawv yuav tsum tsuas yog siv rau hauv cov pob zeb uas tsis muaj zog los yog nyob rau hauv cov xwm txheej uas muaj kev tiv thaiv zoo. Non-chloride-based accelerating admixtures, uas feem ntau muaj calcium nitrate lossis calcium formate, yog lwm txoj hauv kev nyab xeeb thiab tuaj yeem siv rau hauv cov pob zeb ntxiv.

Yuav ua li cas Accelerating Admixtures ua haujlwm

Accelerating admixtures ua hauj lwm los ntawm kev nce tus nqi ntawm cov tshuaj tiv thaiv uas tshwm sim ntawm cov cement thiab dej hauv cov pob zeb sib tov. Cov tshuaj tiv thaiv no, hu ua hydration, yog dab tsi ua rau qhov sib xyaw ua kom tawv thiab nce lub zog.

Thaum ib qho kev sib xyaw ua kom nrawm ntxiv rau cov pob zeb sib xyaw, nws ua raws li cov khoom siv hluav taws xob, ua kom cov txheej txheem hydration thiab tso cai rau cov pob zeb teeb tsa thiab tawv sai dua. Cov txheej txheem tshwj xeeb los ntawm kev ua kom nrawm admixtures ua haujlwm txawv nyob ntawm seb hom admixture siv. Chloride-raws li admixtures ua haujlwm los ntawm kev txo qhov chaw khov ntawm cov dej hauv cov pob zeb sib tov, tso cai rau nws los teeb tsa thiab ua kom tawv ntawm qhov kub qis dua. Non-chloride-based admixtures ua haujlwm los ntawm kev ua kom cov calcium silicate hydrate (CSH) gel, uas yog lub luag haujlwm tseem ceeb rau lub zog ntawm pob zeb.

Cov txiaj ntsig ntawm Accelerating Admixtures

1. Faster Setting thiab Hardening

Cov txiaj ntsig tseem ceeb ntawm kev ua kom cov khoom sib xyaw ua ke rau cov pob zeb yog tias lawv ua kom cov txheej txheem sib xyaw ua ke thiab cov txheej txheem hardening. Qhov no tso cai rau lub sijhawm tsim kho sai dua thiab ua tiav sai ntawm cov phiaj xwm lub sijhawm.

2. Txhim kho huab cua txias ua haujlwm

Accelerating admixtures yog tshwj xeeb tshaj yog pab tau nyob rau hauv cov huab cua txias, qhov twg pob zeb yuav siv sij hawm ntev npaum li cas los teem thiab harden. Los ntawm kev ua kom cov txheej txheem hydration, cov khoom sib xyaw no tso cai rau cov pob zeb kom nchuav thiab teem rau ntawm qhov kub thiab txias.

3. Ua kom muaj zog

Ntxiv nrog rau kev ua kom nrawm nrawm thiab txheej txheem hardening, qee qhov kev sib xyaw ua kom nrawm kuj tuaj yeem txhim kho lub zog ntawm cov pob zeb ua tiav. Qhov no yog vim lawv txhawb kev tsim ntawm CSH gel, uas yog lub luag haujlwm tseem ceeb rau lub zog ntawm pob zeb.

4. Txo Nqi

Siv accelerating admixtures tuaj yeem pab txo tus nqi tag nrho ntawm kev tsim kho cov haujlwm los ntawm kev ua kom lub sijhawm tsim kho thiab ua kom tiav cov haujlwm sai dua. Qhov no tuaj yeem ua rau kev txuag nyiaj ntawm cov nqi zog thiab lwm yam kev siv nyiaj ntsig txog kev tsim kho.

Kev txwv ntawm Accelerating Admixtures

1. Corrosion Risk

Kev siv cov tshuaj chloride-based acceleratingcov khoom xyawnyob rau hauv cov pob zeb reinforced tuaj yeem ua rau muaj kev pheej hmoo ntawm corrosion ntawm steel reinforcement. Qhov no tuaj yeem ua rau lub pob zeb tsis muaj zog thiab ua rau muaj kev kho kom raug nqi.

2. Txo kev ua haujlwm

Ntxiv ib qho admixture nrawm rau pob zeb tuaj yeem txo nws txoj haujlwm ua haujlwm, ua rau nws nyuaj rau kev sib tov thiab ncuav. Qhov no tuaj yeem ua rau cov nqi zog thiab khoom siv ntxiv.

3. Txwv Txee Lub Neej

Accelerating admixtures muaj qhov txwv lub neej txee thiab tuaj yeem poob lawv cov txiaj ntsig thaum lub sijhawm. Qhov no tuaj yeem ua rau qhov xav tau ntawm cov khoom siv ntxiv ntxiv rau cov khoom sib xyaw ua ke, uas tuaj yeem nce nqi.

4. Muaj peev xwm ua kom tawg

Accelerating admixtures tuaj yeem ua rau pob zeb teeb tsa thiab tawv sai dua, uas tuaj yeem ua rau muaj kev pheej hmoo ntawm kev tawg yog tias qhov sib tov tsis raug kho thiab ntxiv dag zog.

Xaus

Accelerating admixtures rau pob zeb yog ib qho cuab yeej zoo rau kev ua kom nrawm ntawm qhov chaw thiab cov txheej txheem hardening ntawm pob zeb. Lawv tshwj xeeb tshaj yog nyob rau hauv txias txias thiab lub sij hawm-sensitive kev tsim kho tej yaam num, tso cai rau lub sij hawm ua tiav sai thiab txo nqi zog. Txawm li cas los xij, kev siv cov tshuaj chloride-raws li admixtures hauv cov pob zeb ua kom muaj zog tuaj yeem ua rau muaj kev pheej hmoo ntawm kev xeb, thiab cov khoom siv tsis muaj chloride tuaj yeem txo qhov kev ua haujlwm ntawm cov khoom sib tov. Accelerating admixtures kuj muaj qhov txwv lub neej txee thiab tuaj yeem ua rau muaj kev pheej hmoo ntawm kev tawg yog tias qhov sib tov tsis raug kho thiab ntxiv dag zog. Txawm hais tias cov kev txwv no, kev sib xyaw ua kom nrawm tseem yog ib qho cuab yeej tseem ceeb rau cov neeg cog lus thiab cov kws tsim khoom siv kom ceev cov txheej txheem tsim kho thiab txhim kho kev ua tau zoo ntawm cov vaj tse pob zeb.