Research on the Strength and Stiffness Monitoring Method of Early-age Concrete Based on Wave Interference Technique
Accurate monitoring of the strength and stiffness of early-age concrete is indispensable for the construction and application of assembled buildings.A non-destructive technique was presented to monitor the evolution of strength and stiffness in early-age concrete.Initially,concrete specimens were cured in water or air following casting.Subsequently,ultrasonic techniques were employed to measure the relative velocity changes of waves in early-age concrete,enabling the analysis of dynamic modulus of elasticity and compressive strength variations over the curing period.The results indicate that the age of concrete curing has a significant impact on the relative velocity.After 28 days of cu-ring,the relative velocity changes for water-cured and air-cured samples increased to 9.0％and 5.3％,respectively.Additionally,the relative velocity changes between bimodal and telescopic curing methods were comparable,with window width minimally affecting estimates.Furthermore,after 28 days of curing,water-cured samples exhibited a 19.7％higher compressive strength,a 13.5％higher dynamic modulus of elasticity,and a relative velocity change approximately 3.9％higher than air-cured samples.The wave interferometry technique effectively differentiated between the effects of the two curing methods,showing a strong linear correlation between relative compressive strength,rela-tive modulus of elasticity,and relative velocity change.
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维普
