Sand yog ib qho ntawm cov khoom siv tseem ceeb tsis yog siv hauv kev tsim kho xwb, tab sis kuj yog kev tsim toj roob hauv pes. Muaj ntau ntau yam ntawm cov khoom siv no, thiab txhua tus ntawm lawv yog qhov tsim nyog rau qee hom kev ua haujlwm. Coarse xuab zeb feem ntau yog siv hauv kev tsim kho.
Sand mining
Sand yog ib qho sib xyaw ntawm cov ntxhia thiab pob zeb uas tsis txuas rau ib leeg. Nws yog mined los ntawm hauv qab ntawm ib tug dej los yog ib tug quarry. Ob hom sib txawv hauv qhov muaj pes tsawg leeg thiab qhov loj me.
Quarry xuab zeb muaj ntau yam impurities, yog li nws yuav tsum tau ua ntau ntxiv:
- Flushing - yog ua kom huv los ntawm cov khoom tsis tsim nyog.
- Sifting - ua thaum tsis tsim nyog cov khoom loj, xws li pob zeb, nkag mus rau hauv pob zeb.
River xuab zeb tsis muaj impurities thiab sib txawv ntawm tib qhov loj ntawm txhua tus neeg hais. Raws li qhov no, nws raug nqi ntau dua.
Ntse
Coarse dej xuab zeb yog qhov tsawg heev, nws qhov loj me ntawm 1.5 txog 2.4 hli. Tab sis cov khoom muab rho tawm los ntawm cov chaw txua txiag zeb, txawm hais tias nws muaj me me impurities, feem ntau yog hais txogfeem ntau nrog qhov ntsuas siab tshaj plaws (2.5-3 hli).
Npaj muag, nws muaj cov yam ntxwv hauv qab no:
- Tsis muaj impurities nyob rau hauv daim ntawv ntawm av nplaum thiab lwm yam.
- Nrog cov dej noo ntau dhau, qhov ntim ntawm cov xuab zeb nce 14% ntawm nws lub xeev qub.
- 1 chav kawm xov tooj cua.
- High te kuj tso cai rau koj kom tsis txhob poob nws cov txiaj ntsig zoo txawm tias qhov kub thiab txias.
Daim ntawv thov
- Coarse xuab zeb feem ntau yog siv rau hauv kev tsim kho, rau kev tsim kho ntawm lub hauv paus ntawm lwm cov khoom siv thauj khoom.
- Included hauv pob zeb thiab cinder block.
- Kuj siv dav hauv kev ua haujlwm ua asph alt.
- Txhim kho cov pob zeb muaj zog.
- Siv thaum tso paving slabs. Coarse xuab zeb tiv thaiv kev tsim ntawm puddles.
- Siv rau kev ua plaster lossis cement screed. Nyob rau hauv cov ntaub ntawv no, lub tsev cov ntaub ntawv mined los ntawm tus dej txoj kev yuav haum tshaj plaws. Vim tias tsis muaj ntau yam impurities txhim kho cov kev daws teeb meem zoo.
- Dav siv hauv cib thiab thaiv ntau lawm. Nws ua rau cov khoom zoo li no ruaj khov, thaum tib lub sijhawm tiv thaiv lawv los ntawm kev puas tsuaj rau cov khoom siv thiab cov teebmeem ntawm qhov kub thiab txias.
Utility functions
- Coarse xuab zeb yog qhov txawv ntawm nws cov kev tiv thaiv zoo, nws tsis khi nrog dej thiab tsis hloov nws cov khoom raws li kev cuam tshuam ntawm cov tshuaj lom neeg. Tias yog vim li cas nws yog ib qho zoo tagnrho ntxiv rau ntau lub tsev sib xyaw thiabkev daws teeb meem. Ua tsaug rau nws, qhov tsawg tshaj plaws shrinkage thiab ntxiv dag zog ntawm cov khoom yog xyuas kom tsis txhob poob cov khoom tseem ceeb.
- Vim nws cov xim nruab nrab thiab lub teeb kev ntxhib los mos, cov xuab zeb ntxhib feem ntau yog siv los kho cov patios thiab lwm lub vaj tsev, nws yog siv los tsim alpine slides thiab taug kev.
- Yog ib yam khoom tseem ceeb hauv kev tsim cov phab ntsa cib.
- Tsis tas li, cov dej tshwj xeeb yog tsim los ntawm cov xuab zeb ntxhib hauv qab lub hauv paus ntawm lub tsev, uas yuav yog qhov zoo tshaj plaws tiv thaiv cov dej noo ntau dhau.
- Siv hauv kev tsim cov septic tanks.
Vim nws cov khoom, cov xuab zeb ntxhib yog cov cuab yeej siv thoob ntiaj teb rau kev ntxiv dag zog rau ntau yam qauv thiab cov khoom siv. Nws yog siv nyob rau hauv ntau qhov chaw ntawm kev tsim kho, nyob rau tib lub sij hawm tau txais mus rau hauv cov muaj pes tsawg leeg ntawm ob lub ntsiab thiab auxiliary ntsiab. Xuab zeb yog txawv nyob rau hauv hais tias nws tsis tuaj yeem rot, fungus thiab lwm yam manifestations ntawm ntau dhau noo noo tsis tsim rau nws. Nws zoo kawg nkaus hla huab cua thiab tsis khaws cov kua hauv. Tsis tas li ntawd, cov khoom no yog ib puag ncig zoo thiab nyab xeeb rau tib neeg noj qab haus huv.
