Failure Precursory Characteristics of Early-Age Steel Fiber Reinforced Concrete under Uniaxial Compression
Affected by hydration and external load,early-age concrete is prone to crack,which affects the durability of the structure.And the resistivity can better reflect the internal damage degree of concrete.In this study,the resistivity monitoring experiments of steel fiber reinforced concrete(SFRC)and normal concrete(NC)during uniaxial compression were carried out to study the influence of age on the resistivity variation characteristics of SFRC during uniaxial compression.The wave velocity tests of SFRC and NC at different ages were carried out.The findings indicate that the resistivity variation of SFRC during uniaxial compression is significantly influenced by age.Specifically,in the period of 28 d,the resistivity variation patterns exhibit an"L"type,a"V"type,and a"U"type.The resistivity of all specimens increases when specimens approach failure.The rate of increase is minimal at 1 and 3 d,but becomes significant at 7,14,and 28 d.The resistivity data provides insights into the initiation and progression of cracks in concrete,with the gradual increase in resistivity serving as an indicator of impending failure in SFRC.The strength and wave velocity of SFRC are higher than that of NC,and the strength and wave velocity of concrete increase with age.
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