Video: Qhov piv rau pob zeb yog dab tsi?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
A pob zeb sib tov piv ntawm 1 part cement , 3 qhov chaw xuab zeb, thiab 3 qhov sib sau ua ke yuav tsim ib qho pob zeb mix ntawm kwv yees li 3000 psi. Kev sib xyaw dej nrog cov cement , xuab zeb, thiab pob zeb yuav tsim ib qho muab tshuaj txhuam uas yuav khi cov ntaub ntawv ua ke kom txog thaum sib tov hardens.
Hais txog qhov no, qhov piv ntawm kev sib xyaw ua vaj tse yog dab tsi?
Nominal sib tov piv rau pob zeb yog 1:2:4 rau M15, 1:1.5:3 rau M20 thiab lwm yam.
Tsis tas li ntawd, qhov piv ntawm m30 qhob yog dab tsi? Piv txwv li, rau qib M20 ntawm pob zeb sib tov, nws lub zog compressive tom qab 28 hnub yuav tsum yog 20 N / mm2.
Pob zeb sib tov piv rooj.
| Qib ntawm pob zeb | Qhov sib piv ntawm cov pob zeb sib xyaw tsim (Cement: Sand: Aggregate) |
|---|---|
| M15 | 1:2:4 |
| M20 | 1:1.5:3 |
| M25 | 1:1:2 |
| M30 | 1:0.75:1.5 |
Yog li ntawd, qhov piv ntawm cov xuab zeb gravel thiab cement rau pob zeb yog dab tsi?
Li qub piv yog 1 part cement ,,2 ntu xuab zeb , thiab 3 ntu pob zeb (luv lo lus ib feem rau duav, thoob, lossis lwm yam khoom siv ntsuas). # Pib ntxiv dej rau qhov sib tov maj mam, sib tov txuas ntxiv kom txog thaum nws dhau los ua yas txaus los tso rau hauv koj daim ntawv.
Qhov sib xyaw ua ke uas muaj zog tshaj plaws yog dab tsi?
Hauv kev ua pob zeb muaj zog , cov khoom xyaw no feem ntau yuav tsum yog sib xyaw hauv a piv ntawm 1: 2: 3: 0.5 kom ua tiav lub zog siab tshaj plaws. Ntawd yog 1 ntu cement , 2 seem xuab zeb, 3 seem gravel, thiab 0.5 feem dej.
Pom zoo:
Yuav ua li cas yog qhov tsawg kawg nkaus pob zeb npog nyob rau hauv mm ntawm ib tug cam khwb cia nyob rau hauv qhov chaw pob zeb tso tawm tsam thiab mus tas li raug rau lub ntiaj teb?
Table-1: Yam Tsawg Npog Thickness rau Cast-in-Place Qhob Hom kev tsim ua vaj tse hla, hli Qhob nrum tiv thaiv thiab txuas mus tas li nrog hauv av 75 Pob zeb sib chwv nrog av lossis dej No. 19 txog No. 57 tuav 50 No. 16 bar thiab me dua 40
Dab tsi yog qhov siab tshaj plaws rau lub pob zeb pob zeb?
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Dab tsi yog qhov txawv ntawm pob zeb pob zeb thiab cov cement slab?
Qhov sib txawv ntawm cov cement thiab pob zeb Txawm hais tias cov ntsiab lus cement thiab pob zeb feem ntau siv sib hloov, cov cement yog cov khoom xyaw ntawm cov pob zeb. Lub pob zeb yog qhov sib xyaw ntawm cov khoom sib xyaw thiab muab tshuaj txhuam. Cov aggregates yog xuab zeb thiab gravel los yog crushed pob zeb; cov tshuaj nplaum yog dej thiab portland cement
Dab tsi yog qhov sib xyaw zoo tshaj plaws rau cov pob zeb pob zeb?
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Dab tsi yog qhov taw qhia ntawm pob zeb pob zeb?
Ib tug footing yog muab tso rau hauv qab ntawm Frost kab thiab ces cov phab ntsa ntxiv rau saum. Qhov taw qhia yog dav dua phab ntsa, muab kev txhawb nqa ntxiv ntawm lub hauv paus ntawm lub hauv paus. Lub hauv paus T-shaped yog muab tso rau thiab tso cai rau kho; thib ob, cov phab ntsa yog tsim; thiab thaum kawg, lub slab yog nchuav ntawm phab ntsa