Cov txheej txheem:
- Muaj peev xwm ua tau ib txwm muaj?
- pozzolanic cement yog dab tsi?
- Xim zeb yog dab tsi?
- Yuav ua li cas ntxiv rau cement kom nws muaj zog?
Video: Yuav ua li cas ua cov cement hauv tsev?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Crumble the ci limestone chunks. Muab ob lub hnab looj tes ua haujlwm thiab siv koj ob txhais tes los txhuam cov limestone txias rau hauv cov hmoov zoo. Cov hmoov nplej yog cov cement, uas koj tuaj yeem sib tov nrog dej, xuab zeb, thiab pob zeb los ua pob zeb.
Muaj peev xwm ua tau ib txwm muaj?
Tab sis cov cement tsis yog qee yam ntawm cov khoom siv organic - nws yog tsim los ntawm kev sib xyaw tshuaj ntawm 8 cov khoom xyaw tseem ceeb thaum lub sij hawm tsim cov cement. Cov khoom xyaw no feem ntau muab rho tawm los ntawm limestone, av nplaum, marl, shale, chalk, xuab zeb, bauxite, thiab hlau ore
pozzolanic cement yog dab tsi?
Pozzolanic cements yog sib xyaw ntawm portland cement thiab cov khoom siv pozzolanic uas tej zaum yuav yog ntuj lossis dag. Lub ntuj pozzolanas yog cov ntaub ntawv tseem ceeb ntawm volcanic keeb kwm tab sis suav nrog qee lub ntiaj teb diatomaceous. Cov khoom siv dag zog muaj xws li cov tshauv ya, hlawv av nplaum, thiab shales.
Xim zeb yog dab tsi?
Cement tseem ceeb muaj cov txheej txheem ntxhia: ob lub calcium silicates, calcium aluminate thiab cov siv lead ua sib xyaw hu ua calcium aluminate ferrite (C4AF). Thaum thawj peb tshwm sim li dawb huv cov zaub mov, pureC4AF muaj xim av vim nws cov ntsiab lus. Yog li theoretically, ntshiab cement yuav xim av.
Yuav ua li cas ntxiv rau cement kom nws muaj zog?
Koj tuaj yeem ntxiv ntau Portland cement rau bagged pob zebkom nws muaj zog. Koj tuaj yeem ntxiv hydrated txiv qaub. Ua kom cov pob zeb muaj zog tshaj plaws, cov xuab zeb yuav tsum tau muab los ntawm volcanic lava uas muaj cov ntsiab lus silica siab.
Pom zoo:
Yuav ntim cov khoom siv hauv tsev li cas rau kev mus ncig hauv huab cua?
Feem ntau, cov neeg taug kev tso lawv cov khoom siv tso rau hauv lub hnab xws li tsuaj zawv plaub hau, cov khoom siv plaub hau, pleev thiab tshuaj txhuam hniavCov tib neeg uas xav ntim lawv cov tshuaj zawv plaub hau loj lossis puv puv Cov tshuaj txhuam hniav yuav tsum ntim cov khoom ntawd rau hauv lawv lub hnab kuaj.
Yuav ua li cas cov chaw vaj tsev yuav qhib hauv qib 4?
Yes, cov chaw vaj tsev tau tso cai nyob hauv Tier 4 thaj chaw hauv tebchaws Askiv vim tias lawv tau txiav txim siab muab cov khoom lag luam thiab cov kev pabcuam tseem ceeb. Lawm, lawv kuj tau qhib hauv Tier 1, 2 thiab 3 ib yam nkaus . Puas vaj tsev yuav tsum kaw hauv Tier 4?
Cov tsev neeg puas yog cov neeg yuav khoom lossis cov muag khoom?
Nyob hauv khw muag khoom thiab kev pabcuam, tsev neeg yog feem ntau cov neeg yuav khoom . Puas yog tsev neeg yuav lossis muag? Tsev neeg yog cov neeg yuav khoom hauv khw rau cov khoom thiab kev pabcuam. Cov tsev neeg sib pauv nyiaj tau los rau cov khoom thiab kev pabcuam.
Yuav siv li cas los nqa cov cement?
Mud jacking tuaj yeem nqa lub pob zeb ua ke los ntawm kev siv lub pob zeb los ntawm cov pob zeb thiab thawb nws hauv qab. Cov txheej txheem qee zaum hu ua "slab jacking" lossis "pressure grouting". 1 mus rau 1 5/8th inch inch qhov yog drilled los ntawm cov pob zeb sunken block / slab ntawm qhov chaw xaiv tsa kom txhawb nqa nqa .
Yuav ua li cas los ua tus tub ceev xwm hauv tsev loj cuj hauv South Africa?
Nkauj Warder Learnerships Requirements Cov neeg sib tw yuav tsum yog neeg xam xaj South Africa. Koj yuav tsum muaj phau ntawv ID, ntaub ntawv lossis daim npav ua pov thawj tias yog neeg xam xaj. Yuav tsum muaj hnub nyoog tshaj 21 xyoos thiab qis dua 35.
