Rebar, luv luv rau reinforcing bar, tuaj yeem tawg thaum khoov vim ntau yam cuam tshuam nrog nws cov khoom siv, tuav, thiab khoov txheej txheem:
Khoom zoo: Qhov zoo thiab qib ntawm rebar ua lub luag haujlwm tseem ceeb. Qib qis rebar lossis rebar nrog impurities tej zaum yuav muaj lub zog tsis sib xws, ua rau nws yooj yim dua rau kev tawg thaum khoov.
Brittleness: Rebar tuaj yeem ua nkig vim kev tuav tsis raug, cia, lossis raug kub heev. Brittle rebar feem ntau yuav tawg los yog tawg thaum raug khoov quab yuam.
Txoj kev khoov tsis raug: Khoov rebar yuav tsum muaj kev txawj ntse thiab siv cov cuab yeej tsim nyog. Yog hais tias lub vojvoog dabtsi yog khoov nruj dhau los yog siv lub zog ntau dhau thaum khoov, nws tuaj yeem tshaj qhov rebar lub zog tawm los, ua rau nws tawg.
Pre-existing Defects: Txhua yam tsis xws luag hauv cov rebar, xws li microcracks lossis voids, tuaj yeem ua raws li kev ntxhov siab concentrators thaum khoov. Cov teeb meem no tuaj yeem nthuav tawm thiab ua rau tsis ua tiav tam sim ntawd.
Kev qaug zog: Rov qab khoov lossis khoov tom qab kev ntxhov siab dhau los (xws li khoov thiab ncaj) tuaj yeem ua rau qaug zog hauv lub rebar. Kev qaug zog ua rau cov khoom tsis muaj zog thaum lub sijhawm thiab tuaj yeem ua rau tsis ua haujlwm thaum lub sijhawm khoov tom ntej.
Corrosion: Yog hais tias rebar yog corroded, nws cross-sectional cheeb tsam thiab lub zog yuav raug txo. Corrosion ua rau cov rebar tsis muaj zog thiab ua rau nws yooj yim rau kev tawg thaum khoov.
Kev tuav tsis raug: Kev siv tsis raug thaum lub sij hawm thauj mus los lossis kev khaws cia tuaj yeem ua rau lub cev puas tsuaj lossis khoov ntawm lub rebar dhau ntawm nws qhov kev txwv tsis pub muaj zog, ua rau nws tsis muaj zog thiab ua rau nws yooj yim rau kev tawg thaum lub sij hawm khoov tom ntej.