Assessment of Post-Fire Residual Strength of Reinforced Concrete Using Ultrasonic Pulse Velocity

C. H. Chiang et al., "Assessment of Post-Fire Residual Strength of Reinforced Concrete Using Ultrasonic Pulse Velocity ", Key Engineering Materials, Vols. 270-273, pp. 1506-1512, 2004

Online since:

August 2004

Authors:

Chih Hung Chiang, Chung Che Yang, Chung Yen Huang

Keywords:

Concrete, Pulse Velocity, Residual Strength, Wavelet

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References

[1] A. M. Neville: Properties of Concrete 3 rd ed. (Pitman Books, London, 1981, pp.500-505. ).

[2] L. T. Phan: Fire Performance of High-Strength Concrete: A Report of the State-of-the Art (NISTIR 5934, National Institute of Standards and Technology, Gaithersburg, Maryland, 1996, pp.5-60. ).

DOI: https://doi.org/10.6028/nist.ir.5934

[3] G. T. G Mohamedbhai: Magazine of Concrete Research Vol. 38 (1986), p.151.

[4] B. S. Hamad: Journal of Applied Fire Science Vol. 6 (1996-97), p.127.

[5] D. F. Dorsch: Innovation in Repair Techniques of Concrete Structures Proceedings of the 1993 ASCE Annual Convention and Exposition, Dallas, October 1993, p.16.

[6] A. Benedetti: ACI Structural Journal Vol. 95 (1998), p.259.

[7] ACI 228. 1R-95: In-Place Methods to Estimate Concrete Strength (American Concrete Institute, Farmington Hills, Michigan, 1995. ).

[8] H-W. Chung and K. S. Law: Cement, Concrete and Aggregates Vol. 7 (1985), p.84.

[9] A.Y. Nassif, E. Burley, and S. Rigden: Magazine of Concrete Research Vol. 47 (1995), p.271.

[10] G. C. Hoff, A. Bilodeau, and V. M. Malhotra: Concrete International Vol. 22 (2000), p.41.

[11] C-L. Tsai, C-H. Chiang, C-C. Yang, and C-M. Chen: Strength deterioration of concrete at high temperature, submitted to ACI Materials Journal, (2004).

[12] A. M. Neville: Properties of Concrete 3 rd ed. (Pitman Books, London, 1981, pp.499-500. ).

[13] C-H. Chiang and C-T. Huang: Review of Progress in Quantitative Nondestructive Evaluation Vol. 20 (2001), p.1164.

[14] S. Mallat: A Wavelet Tour of Signal Processing (Academic Press, New York, 1998).

[15] M. Misiti, Y. Misiti, G. Oppenheim, and J-M. Poggi: Wavelet Toolbox User's Guide (The Math Work, Inc. Natick, MA, U.S.A. 2000).

Paper TitlePages

The Quality of Concrete Made with Typical Benin City Silty Sand

Authors: O.E. Alutu, E.N. Ejike

Abstract: The purpose of this study is to carry out tests on concrete made with a typical Benin City silty sand and determine the major concrete quality indicators such as pulse velocity, water/cement ratio and compressive strength in order to justify the continued utilization of such sands in concrete production in and around Benin City. To do this, concrete made with the selected sand were designed using DOE mix design method and test cubes were cast in three batches. Two cubes were cast for each of the sixteen consecutive tests carried out and averages taken for each design grade strength of 10,20,30,40 and 50N/mm2. Also, pulse velocity and rebound hammer tests were carried out on the cubes before testing the cubes destructively. The results show that concrete produced with the Benin City silty sands are of good quality in all respect but generally characterized by low 28th day – characteristic strength. The sands should therefore be used in construction provided that the mean strength aimed at during design is sufficiently higher than the characteristic strength by the strength margin (ks) from structural point of view to enable every part of the structure have adequate strength.

Assessing the Fracture and Damage Process in Recycled Aggregate Concrete under Compressive Loading by Acoustic Emission

Authors: Seung Hyun Ryu, Young Oh Lee, Sun Woo Kim, Hyun Do Yun

Abstract: Acoustic emission (AE) is a powerful nondestructive test that can be used to characterize cracking, growth of cracks, and the degree of damage. This technique is clearly distinguished from other nondestructive techniques as it is a nondestructive test that estimates the degree of damage to concrete. In this study, the AE signals emitted during failure, according to the strength of recycled aggregate concrete specimens was examined, in order to characterize them using existing research results and evaluation theories. In addition, it is demonstrated that AE can be utilized to identify crack source and the mechanism of crack growth, which were monitored using a software program developed from the theory of the location of the source of a microcrack.

2528

Experimental Research on the Fracture Properties of Roller Compacted Steel Fiber Recycled Concrete

Authors: Yan Dong Jia, Zheng Wei Zhou, Yan Dong Qu, Ao Shuang Tian

Abstract: Comparative experiments on the ordinary steel fiber recycled concrete (SFRC) and roller compacted SFRC were carried out to research the fracture properties of roller compacted SFRC. The results show that compressive strength, fracture toughness and fracture energy of roller compacted SFRC increase with the increase of fiber volume fraction. Compressive strength increase with the increase of recycled aggregate replacement rate and fracture toughness decrease, however, Crack tip opening displacement has little changes and fracture energy features fluctuation with the replacement ratio of recycled coarse aggregates increasing. The rolled formed layers have significant influence on the fracture properties of SFRC. The fracture toughness of roller compacted SFRC is generally lower than ordinary SFRC and compressive strength is higher than ordinary steel fiber concrete for the same aggregate replacement ratio and fiber volume fraction. Fracture energy of roller compacted SFRC is higher than ordinary SFRC for the higher steel fiber volume ratio.

135

Performance of Concrete at Sustained High Temperature in Material Applications

Authors: Hong Zhu Quan

Abstract: The effects of sustained high temperature on concrete properties are discussed in this paper. In this experiment, concrete with 6 types of cement were tested after high temperature exposure. Although, test procedures were the same as past literature, test results showed different tendency. The temperature of 50°C at which compressive strength was minimal were found for concrete with high-early strength and medium-heat portland cement, which concrete with other cements showed no change up to 110°C. Relationship between weight loss and compressive strength differed from past literature.

150

Flexural Strength of C40 HPC after Elevated High Temperatures

Authors: Xiao Qing Nie, Hong Xiu Du, Rui Zhen Yan

Abstract: After 51 C40 HPC specimens with a size of 100mm×100mm×400mm were heated to 400°C, 600°C, 700°C, 800°C for 2 hours, and 300°C and 500°C for 1h, 2h, 3h, 4h, 5h separately, cooled naturally and placed for 24 hours, the flexural strength were experimented respectively. Subsequently, the effect of high temperature and its acting time on the flexural strength of HPC and the variation discipline were analyzed; meanwhile, the degradation mechanism of HPC after elevated high temperature was discussed.

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