Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Panzera, Túlio Hallak; Christofóro, André Luis; Cota, F. P.; Borges, Paulo Henrique Ribeiro; Bowen, Chris

doi:10.5772/17167

Cited by 47 publications

(38 citation statements)

References 49 publications

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“…Various researchers have investigated the relationships between mechanical properties (modulus of elasticity, compressive strength, etc.) and pulse velocity [10][11][12][13][14][15]. UPV test has been implemented with PUNDIT7, an ultrasonic non-destructive integrity-testing machine, on three cubic specimens with dimensions of 100 Â 100 Â 100 mm to determine effects of fibers on mechanical properties, such as tensile and compression strengths.…”

Section: Ultrasonic Pulse Velocity (Upv)mentioning

confidence: 99%

Experimental assessment of functionally graded reinforced concrete (FGRC) slabs under drop weight and projectile impacts

Mastali

Naghibdehi

Naghipour

et al. 2015

Construction and Building Materials

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Section: Ultrasonic Pulse Velocity (Upv)mentioning

confidence: 99%

Experimental assessment of functionally graded reinforced concrete (FGRC) slabs under drop weight and projectile impacts

Mastali

Naghibdehi

Naghipour

et al. 2015

Construction and Building Materials

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“…Two transducers are used-one transmitter of ultrasonic signals and the other as a receiver of these signals [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. They usually operate in the frequency range of 25-60 kHz.…”

Section: Essence Of the Non-destructive Ultrasonic Pulse Velocity Methodsmentioning

confidence: 99%

“…The mechanical properties, the deformation characteristics, and the concrete parameters such as compressive strength and modulus of elasticity [3,6,7] can be determined from the velocity or transmitting time of the ultrasonic signal. The NDUPVM is used in order to verify the concrete homogeneity, to detect internal imperfections (presence of caverns, internal defects and cracks), to evaluate the depth of imperfections, to estimate the modulus of elasticity and the compressive strength of the concrete, and to monitor the characteristics variations of concrete throughout time [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Essence Of the Non-destructive Ultrasonic Pulse Velocity Methodsmentioning

confidence: 99%

About the Possible Limitations in the Usage of the Non-Destructive Ultrasonic Pulse Velocity Method for Assessment of Cracks in Reinforced Concrete Structures, Subjected to Direct Environmental Exposure

Ivanchev

Slavchev

2019

Buildings

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Failures occur in the structures of reinforced concrete buildings and facilities during their continuous exploitation, without being overloaded or exposed to extreme impacts, the most common being cracks. Their detection and change in time are related to the assessment of the state of the structures, their safety, and reliability during their construction and especially for their safety exploitation. This paper describes the results of the experimental studies conducted by authors aiming to verify the possibility of using the non-destructive ultrasonic pulse velocity method (NDUPVM) for detection and evaluation of cracks. Results of an experimental study of 12 reinforced concrete beams are presented. In previous experiments, some of them were subjected to bending until the maximum crack width of 0.3 mm was reached and others until yielding of the longitudinal reinforcement. The results obtained from the measurements of the depths of the normal cracks with different widths with NDUPVM were compared with the visually measured ones. In the present research cracks with the same width and with a similar depth were chosen. The influence of extreme external conditions to the accuracy of the measured crack depths by the NDUPVM was investigated. Non-destructive ultrasonic research was done by a portable device Proceq TICO.

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“…A number of researchers have developed theoretical models for the prediction of relationships between pulse velocity and physic-mechanical properties, such as modulus of elasticity, compressive strength, density, porosity and permeability. Other interests are focused on the correlation between pulse velocities and cement characteristics, such as water/cement ratio, aggregate particle size, hydration process and curing temperature effects (Panzera et al 2011).…”

Section: Ultrasonic Pulse Velocity Measurementsmentioning

confidence: 99%

“…opposite faces -a. direct transmission, b. adjacent faces -semi-direct transmission; and c. the same face -indirect or surface transmission(Panzera et al 2011). …”

mentioning

confidence: 99%

Characterizations of concretes with alkali-activated binder and correlating their properties from micro- to specimen level

Kar¹

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Background 1 1.2 Motivation 2 1.3 Goals 3 1.4 Research Objectives 4 1.4.1 Characterization at microstructural level 4 1.4.2 Characterization at Specimen Level: Both Destructive and Nondestructive Testing 5 1.4.3 Statistical tools to correlate microlevel to specimen level properties 5 CHAPTER 2 LITERATURE REVIEW 6 2.1 History of Concrete with Alkali Activated Binders 6 2.2 Terminology and Chemistry of Geopolymer (or AAB) 8 2.3 Applications of Geopolymers (or AAB) 2.4 Current Trend of Research on Geopolymer (or AAB) 2.5 Fly Ash Based Geopolymer (or AAB)-A Brief Overview 2.5.1 Microstructure of fly ash AAB 2.5.1.1 General characterization of AAB gels 2.5.1.2 Role of silicon in N-AS -H gel structure 2.5.1.3 Role of aluminum in N-AS -H gel 2.5.1.4 Role of sodium in N-AS -H gel structure v 2.6 Microanalysis Techniques 2.6.1 X-ray diffraction (XRD) 2.6.2 XRD of fly ash-based AAB 2.6.3 SEM/EDS 2.6.3.1 SEM results from previous research 2.6.3.2 EDS results from previous research 2.7 Fourier Transform Infra-Red (FTIR) spectroscopy 2.8 Nondestructive Characterization of Cement Using Ultrasound Techniques 2.9 Correlation between Microscale and Mechanical Characteristics at Specimen Level Using Nondestructive Characterizations 2.10 Brief Overview of R 2.11 Summary from Literature Review and Limitations of Existing Research CHAPTER 3 MATERIALS AND MIX PROPORTIONS 3.1 Materials 3.1.1 Coarse aggregate 3.1.2 Fine aggregate 3.1.3 Fly ash 3.1.4 Slag 3.1.5 Sodium hydroxide [NaOH] 3.1.6 Sodium silicate [Na 2 O.2SiO 2 ] 3.1.7 Mixing water 3.1.8 High range water reducing admixture (HRWRA) 3.2 Selection Criteria for Mix Proportions 3.3 Mixing Procedure 3.3.1 Preparation of dry mix 3.3.2 Preparation of liquid mix 3.3.3 Combination of solid and liquid mix 3.4 Curing Procedure vi 3.5 Sample Calculations for the Mix Design 3.6 Calculation for Additional Water to Achieve Desired Workability 3.7 Calculation for Effective Molarity of NaOH in the Mix CHAPTER 4 CHARACTERIZATION OF HARDENED ALKALI ACTIVATED BINDER PASTE AT MICROSTRUCTURAL LEVEL 4.1 XRD 4.2 FTIR Results 4.3 SEM/EDS 4.3.1 Polishing/Sample preparation for SEM/EDS 4.3.2 Sputtering the samples before SEM/EDS 4.3.3 SEM results 4.4 EDS Results 4.5 Analysis of Microscale Test Results Using Volume Stoichiometry and Optimization 4.5.1 Chemical reactions during alkali activation of fly ash 4.5.2 Reaction mechanism of alkali activation of slag 4.6 Estimation of Quantities of the Products of Alkali Activation of Fly Ash and Hydration of Slag 4.6.1 Estimation of polymer product due to alkali activation of fly ash 4.6.2 Estimation of polymer product and CSH(S) for P% fly ash combined with Q% slag 4.7 Degree of Reaction at Different Ages 4.8 Isothermal Calorimetry vii 4.9 Optimization Using GAMS 92 4.10 Comparison of Experimental and Predicted Data for Reacted AAB Paste Product and CSH(S) Using Results from Optimization 95 4.11 Variation of Reacted AAB Paste Product and CSH(S) and the Total Hydrated Paste Volumes with Time for Different Combinations of Fly Ash and Slag at Different Temperatures

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Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Cited by 47 publications

References 49 publications

Experimental assessment of functionally graded reinforced concrete (FGRC) slabs under drop weight and projectile impacts

Experimental assessment of functionally graded reinforced concrete (FGRC) slabs under drop weight and projectile impacts

About the Possible Limitations in the Usage of the Non-Destructive Ultrasonic Pulse Velocity Method for Assessment of Cracks in Reinforced Concrete Structures, Subjected to Direct Environmental Exposure

Characterizations of concretes with alkali-activated binder and correlating their properties from micro- to specimen level

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