Characterization of entrained air voids in cement paste with scattered ultrasound

Punurai, Wonsiri; Jarzynski, Jacek; Qu, Jianmin; Kurtis, Kimberly E.; Jacobs, Laurence J.

doi:10.1016/j.ndteint.2006.02.001

Cited by 77 publications

(47 citation statements)

References 23 publications

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“…The results demonstrated that the honeycomb can cause obvious spectra dispersion of the surface wave. Punurai [10] analyzed the volume content of capillary pores and air voids in hardened cement pastes with ultrasonic measurement. The results were comparable to the traditional petrographic methods based on American Society for Testing and Materials (ASTM) C457 [11].…”

Section: Of 18mentioning

confidence: 99%

Ultrasonic Techniques for Air Void Size Distribution and Property Evaluation in Both Early-Age and Hardened Concrete Samples

et al. 2017

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Entrained air voids can improve the freeze-thaw durability of concrete, and also affect its mechanical and transport properties. Therefore, it is important to measure the air void structure and understand its influence on concrete performance for quality control. This paper aims to measure air void structure evolution at both early-age and hardened stages with the ultrasonic technique, and evaluates its influence on concrete properties. Three samples with different air entrainment agent content were specially prepared. The air void structure was determined with optimized inverse analysis by achieving the minimum error between experimental and theoretical attenuation. The early-age sample measurement showed that the air void content with the whole size range slightly decreases with curing time. The air void size distribution of hardened samples (at Day 28) was compared with American Society for Testing and Materials (ASTM) C457 test results. The air void size distribution with different amount of air entrainment agent was also favorably compared. In addition, the transport property, compressive strength, and dynamic modulus of concrete samples were also evaluated. The concrete transport decreased with the curing age, which is in accordance with the air void shrinkage. The correlation between the early-age strength development and hardened dynamic modulus with the ultrasonic parameters was also evaluated. The existence of clustered air voids in the Interfacial Transition Zone (ITZ) area was found to cause severe compressive strength loss. The results indicated that this developed ultrasonic technique has potential in air void size distribution measurement, and demonstrated the influence of air void structure evolution on concrete properties during both early-age and hardened stages.

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Section: Of 18mentioning

confidence: 99%

Ultrasonic Techniques for Air Void Size Distribution and Property Evaluation in Both Early-Age and Hardened Concrete Samples

et al. 2017

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“…In a recent study (26), pulse-burst ultrasound signals with a frequency range between 500 kHz and 5 MHZ were used to characterize the entrained air voids in hardened cement paste. For a cement matrix with no embedded air voids, weak dispersions of longitudinal (p-wave) and transverse waves were observed experimentally in the frequency range of interest (500 kHz to 5 MHz), i.e., the measured phase velocities were constant.…”

Section: Ultrasonic Characterization Techniquesmentioning

confidence: 99%

“…An alternative approach for ultrasonic characterization employs surface acoustic wave measurements (25,26,37). These waves can be used to characterize the first few centimeters of a test specimen using a sensor positioned on the free surface.…”

Section: Ultrasonic Characterization Techniquesmentioning

confidence: 99%

Feasibility Study of In-situ Characterization of Size Distribution of Air Voids in Concrete Pavements

Li¹,

Tong²,

Liu³

2013

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The Joint Transportation Research Program serves as a vehicle for INDOT collaboration with higher education institutions and industry in Indiana to facilitate innovation that results in continuous improvement in the planning, design, construction, operation, management and economic efficiency of the Indiana transportation infrastructure. https://engineering.purdue.edu/JTRP/index_html AbstractThis report concerns a feasibility study on the use of a non-destructive and non-invasive method to determine the size distribution of air voids in fresh concrete, which will be used for laying concrete pavement. A preliminary review of different techniques suggested that the measurement of the p-wave velocity of ultrasound pulses transmitted through a fresh concrete specimen offers the most straightforward approach. This report describes an experimental study to address the design of an experimental test rig, the selection of appropriate equipment, and the determination of the p-wave velocity in fresh cementitious materials. The paper starts with the ultrasound characterization of fresh cement and mortars. Then, the feasibility of using the ultrasound method to determine the air-void content in a fresh concrete specimen with a minimum thickness of 4" is examined. In addition to the discussions of the ultrasound characterization of fresh cementitious materials, this paper also reports on the development of a suite of MATLAB programs to characterize the air-void systems of hardened cementitious materials. The approach is based on image processing techniques used to analyze digital images of polished specimens collected with a flatbed scanner. The results will provide pertinent information on the airvoid systems in hardened cementititous materials. 17.

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“…amplitude and frequency which are continuously decaying due to attenuation (Landis and Shah 1995, Owino and Jacobs 1999, Jacobs & Owino 2000. In addition to the well known use and interpretation of pulse velocity, frequency and dispersion features have recently been studied with the aim of more accurate characterization concerning the damage content and characteristic size (Aggelis & Philippidis 2004, Philippidis & Aggelis 2005, Punurai et al 2006, Aggelis & Shiotani 2007a, Chaix et al 2006. Dispersion originates from inhomogeneity and hence the velocity dependence on frequency should be much more evident in damaged than in healthy media.…”

Section: Introductionmentioning

confidence: 99%

“…Dispersion originates from inhomogeneity and hence the velocity dependence on frequency should be much more evident in damaged than in healthy media. Concrete is inhomogeneous by nature due to porosity and aggregates and exhibits moderate dispersive trends (Philippidis & Aggelis 2005, Punurai et al 2006. Nevertheless, cracks due to size and severe impedance mis-match with the matrix material, are stronger scatterers of elastic waves and influence wave propagation more effectively than the inherent inhomogeneity of the material.…”

Section: Introductionmentioning

confidence: 99%

Elastic Waves on Large Concrete Surfaces for Assessment of Deterioration and Repair Efficiency

Aggelis¹,

Chai²,

Shiotani³

2012

Nondestructive Testing Methods and New Applications

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Characterization of entrained air voids in cement paste with scattered ultrasound

Cited by 77 publications

References 23 publications

Ultrasonic Techniques for Air Void Size Distribution and Property Evaluation in Both Early-Age and Hardened Concrete Samples

Ultrasonic Techniques for Air Void Size Distribution and Property Evaluation in Both Early-Age and Hardened Concrete Samples

Feasibility Study of In-situ Characterization of Size Distribution of Air Voids in Concrete Pavements

Elastic Waves on Large Concrete Surfaces for Assessment of Deterioration and Repair Efficiency

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