Analysis of the single and combined non-destructive test approaches for on-site concrete strength assessment: General statements based on a real case-study
“…f c = 21.5V p − 62 45 1st polynomial Ali-benyahia [34] f c = 0.6401V 2.5654 p 21.9 Power Atici [10] f c = 0.0316exp 1.3Vp 36.4 Exponential Del Rio [40] f c = e [(−5.4±0.8)+(0.00185±0.00018)Vp] 34.0 Exponential Khan [17] f c = 0.5208V 5 p 100 Power Kim [10] f c = 50.163V p − 178.2 60 1st polynomial Najim [11] f c = 0.0136V p − 21.34 50 1st polynomial Qasrawi [13] f c = 32.72V p − 129.077 42 1st polynomial Rashid [38] f c = 38.05V 2 p − 316.76V p + 681.62 52 2nd polynomial Trtnik et al [16] f c = 0.854exp 1.2882Vp 50 Power * calculated by using the results in Table 3. * calculated by using the results in Table 3.…”
Abstract:Estimating the compressive strength of high strength concrete (HSC) is an essential investigation for the maintenance of nuclear power plant (NPP) structures. This study intends to evaluate the compressive strength of HSC using two approaches: non-destructive tests and concrete core strength. For non-destructive tests, samples of HSC were mixed to a specified design strength of 40, 60 and 100 MPa. Based on a dual regression relation between ultrasonic pulse velocity (UPV) and rebound hammer (RH) measurements, an estimation expression is developed. In comparison to previously published estimation equations, the equation proposed in this study shows the highest accuracy and the lowest root mean square error (RMSE). For the estimation of compressive strength using concrete core specimens, three different concrete core diameters were examined: 30, 50, and 100 mm. Based on 61 measured compressive strengths of core specimens, a simple strength correction factor is investigated. The compressive strength of a concrete core specimen decreases as the core diameter reduces. Such a relation is associated with the internal damage of concrete cores and the degree of coarse aggregate within the core diameter from the extracting process of the cores. The strength estimation expressions was formulated using the non-destructive technique and the core strength estimation can be updated with further test results and utilized for the maintenance of NPP.
“…f c = 21.5V p − 62 45 1st polynomial Ali-benyahia [34] f c = 0.6401V 2.5654 p 21.9 Power Atici [10] f c = 0.0316exp 1.3Vp 36.4 Exponential Del Rio [40] f c = e [(−5.4±0.8)+(0.00185±0.00018)Vp] 34.0 Exponential Khan [17] f c = 0.5208V 5 p 100 Power Kim [10] f c = 50.163V p − 178.2 60 1st polynomial Najim [11] f c = 0.0136V p − 21.34 50 1st polynomial Qasrawi [13] f c = 32.72V p − 129.077 42 1st polynomial Rashid [38] f c = 38.05V 2 p − 316.76V p + 681.62 52 2nd polynomial Trtnik et al [16] f c = 0.854exp 1.2882Vp 50 Power * calculated by using the results in Table 3. * calculated by using the results in Table 3.…”
Abstract:Estimating the compressive strength of high strength concrete (HSC) is an essential investigation for the maintenance of nuclear power plant (NPP) structures. This study intends to evaluate the compressive strength of HSC using two approaches: non-destructive tests and concrete core strength. For non-destructive tests, samples of HSC were mixed to a specified design strength of 40, 60 and 100 MPa. Based on a dual regression relation between ultrasonic pulse velocity (UPV) and rebound hammer (RH) measurements, an estimation expression is developed. In comparison to previously published estimation equations, the equation proposed in this study shows the highest accuracy and the lowest root mean square error (RMSE). For the estimation of compressive strength using concrete core specimens, three different concrete core diameters were examined: 30, 50, and 100 mm. Based on 61 measured compressive strengths of core specimens, a simple strength correction factor is investigated. The compressive strength of a concrete core specimen decreases as the core diameter reduces. Such a relation is associated with the internal damage of concrete cores and the degree of coarse aggregate within the core diameter from the extracting process of the cores. The strength estimation expressions was formulated using the non-destructive technique and the core strength estimation can be updated with further test results and utilized for the maintenance of NPP.
“…The range of the observed differentials which is 20%-30% underestimates between the measured and predicted values. Further investigations needed with greater data to examine and validate the findings in the studies other than those of [6], [9], [11], [16], [19], [20], [21], [26] and [27].…”
Section: A Comparative Study Of Empirical Modelmentioning
confidence: 99%
“…A number of researchers as in [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20] and [21] exercised DT and NDT methods and proposed numerous relationships between the two.…”
Wide spread literature is available on the approach to assess the strength of Reinforced Concrete structures. However no attention has been made so far to study the similar potential when the RC columns are reinforced with double layer of transverse confining stirrups. An obvious reason could be that studies in double layered stirrups options are quite at their infancy. The authors took the advantage of their involvement in studying the axial compression behaviour in terms of strength and ductility of concrete columns reinforced with double layered transverse confining stirrups, applied the two non-destructive measures, viz., Rebound Hammer Test Method (RHTM) and Ultrasonic Pulse Velocity Test Technique (UPVTT), and destructive testing measure, viz., Compression Testing Method (CTM) on the specimens that they have developed in this study. The results have been subjected to regression techniques to build relevant equations for predictability. The present study attempts to explain the detailed procedures adopted within the frame work of the informed knowledge and had attempted to derive meaningful implications for the use of practitioners and academic fraternity. The findings of this paper drew attention to the superior impact of a combined non-destructive testing approach whereby RHTM and UPVTT have been merged in a fashion to yield better assessment of RC columns with double layers of transverse confining stirrups. The combined influence of RHTM and UPVTT clearly explain, greater characteristic compressive strength as one moves from a specimen with a Normal Strength Concrete (NSC) to a specimen with High Strength Concrete (HSC).
“…Estimation of the in situ mechanical properties of existing concrete structures is imperative for evaluating their structural quality throughout their service lives. Among the currently available testing methods, rebound hammer tests, the core-drilling method, and postinstalled pull-out tests are the most widely used for assessing the compressive strength of concrete [1,2]. Compared with the core-drilling method [3], using the rebound hammer test and the postinstalled pull-out test to estimate the in-place strength of concrete allows larger amounts of data to be collected without a significant impact on the structure, resulting in higher reliability.…”
Rebound hammer tests and postinstalled pull-out tests are commonly used for evaluating the compressive strength of ordinary concrete, and the strength of concrete is estimated by strength curves. However, using these strength curves to predict the compressive strength of carbon fiber-reinforced concrete (CFRC), polypropylene fiber-reinforced concrete (PFRC), and carbonpolypropylene hybrid fiber-reinforced concrete (HFRC) may lead to considerable uncertainties. erefore, this study revises the strength curves derived from rebound hammer tests and postinstalled pull-out tests for ordinary concrete. 480 specimens of fiberreinforced concrete (FRC) of six strength grades are examined. Standard cube compressive strength tests are used as a reference, and the results of various regression models are compared. e linear model is determined as the most accurate model for postinstalled pull-out tests, whereas the power model is the most accurate for rebound hammer tests. e proposed strength curves have important applications for FRC engineering of the postinstalled pull-out tests and rebound hammer tests.
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