Video: MPa pob zeb rau footpath yog dab tsi?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Cov khoom siv xws li 20 mus rau 50 MPa compressive lub zog ntawm 28 hnub nrog kev tsim kev poob qis uas muaj qhov pom zoo los ntawm 20 mus rau 120 hli muaj nyob rau hauv ob qho tib si 10 hli, 14 hli thiab 20 hli. tag nrho qhov ntau thiab tsawg. Feem ntau siv rau hauv tsev slabs, driveways, footings thiab footpaths.
Tsis tas li ntawd, MPa yog dab tsi?
Txhais . Ib megapascal ( MPa ) yog ib qho kev ntsuas ntawm lub zog compressive ntawm pob zeb . Nws tso cai rau cov neeg soj ntsuam paub tias lub siab npaum li cas tuaj yeem siv rau pob zeb ua ntej nws tawg los yog ua tsis tau. Qhov siab dua MPa ntawm pob zeb , cov khoom siv zog yuav muaj zog dua, thiab qhov tsawg dua nws yuav ua tsis tiav.
Qhov thib ob, qhov sib tov rau 25 MPa yog dab tsi? Cockburn General Purpose Concrete yog qhov sib xyaw ua ke zoo ntawm Cockburn GP Cement, Xuab zeb thiab 10-12mm aggregate. Qhov no 25 MPa pob zeb sib tov yog qhov sib xyaw ua ke siv rau hauv cov kab hluav taws xob ntxiv, cov pob zeb hauv pem teb, kev tsav tsheb thiab cov ko taw.
Ib yam li ntawd, MPa ntsuas li cas hauv pob zeb?
Compressive zog yog ntsuas los ntawm kev tawg cylindrical pob zeb cov qauv hauv lub tshuab compression-testing. Compressive zog yog xam los ntawm qhov tsis ua hauj lwm load muab faib los ntawm qhov cross-sectional cheeb tsam tiv thaiv lub load thiab qhia nyob rau hauv units ntawm phaus-force ib square inch (psi) los yog megapascals ( MPa ).
Class A yog dab tsi?
Qib ntawm pob zeb yog qhov sib xyaw tiag tiag cement , xuab zeb thiab aggregate siv kom tau ib lub zog compressive thaum lub chav kawm ntawm pob zeb ( chav kawm A, B, C lossis D) qhia txog lub zog hauv PSI's, i.e. CLASS A muaj lub cev muaj zog ntawm 4000 lbs.
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?
Kev sib xyaw ua ke ntawm 1 feem ntawm cov cement: 2 qhov chaw xuab zeb: 4 qhov sib xyaw ua ke (los ntawm ntim) yuav tsum tau siv rau kev taw qhia. Cov pob zeb yuav tsum tau muab tso rau hauv ib nrab ib teev ntawm kev sib tov.Brickwork - Muab koj cov pob zeb tso rau hauv koj lub trench
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