Ultrasonic pulse velocity has been found to be a valuable and reliable method of detecting interior of concrete member in truly a non destructive way. If the data about factors influencing pulse velocity as stated above is not available , then, the assessment of compressive strength will have limitations.

Ultrasonic pulse velocity technique is one of the most popular non-destructive techniques used in the assessment of concrete properties. However, it is very difficult to accurately evaluate the concrete compressive strength with this method since the ultrasonic pulse velocity values are affected by a number of factors, which do not necessarily influence the concrete compressive strength in the

List the parameters that can impact the wave velocity in concrete during ultrasonic pulse velocity (UPV) test. Question: 5. List the parameters that can impact the wave velocity in concrete during ultrasonic pulse velocity (UPV) test. If T is incresed then pulse velocity is decresed. Factors Affecting The Measurements Of Puls

Smoothness of contact surface under test affects the measurement of ultrasonic pulse velocity. For most concrete surfaces, the finish is usually sufficiently smooth to ensure good acoustical contact by the use of a coupling medium and by pressing the transducer against the concrete surface.

In concrete, fatigue and freeze-thaw are associated with the progressive growth of internal microcracks. The Ultrasonic Pulse Velocity (UPV) technique, one of the most widely used Nondestructive Testing (NDT) methods, is promising in evaluating internal microcracks and eventually detecting damage.

frequency through a specimen of concrete or pulse velocity travelling through the concrete is measured. From the known values of length of specimen, density of concrete and resonant frequency the value of dynamic modulus in S.I. units is determined from the relation- Ed = K.n2L2 ρ where, Ed = dynamic modulus of elasticity K = a constant n

COllcrete. His research interests incllU/{' Ilolldestruclive evalua!uJ/1 of concrete struc­ lUres with all emphaSIS 011 structure and infrastructllre dural)[lity. Many studies have been conducted on direct pulse velocity determination and factors that affect it. Standards are avail­ able for measuring velocity using direct transmission (ASTM

The ultrasonic test method requires measurement on both sides of a concrete element, and it is the most popular technique for testing the compressive strength of concrete. The ultrasonic method is suitable for evaluating the uniformity of concrete. There are many factors that affect the UPV, but they do not necessarily affect the compressive

surface. Low frequency ultrasonic pulses (about 30 kHz) are sent by the transmitting transducer and received by the second transducer with the time taken for the ultrasonic pulse to travel recorded by a timer. The pulse velocity is determined by dividing the path length between the two transducers by the pulse travel time.

MODULUS OF ELASTICITY AND ULTRASONIC PULSE VELOCITY OF CONCRETE CONTAINING POLYETHYLENE TEREPHTHALATE (PET) WASTE HEATED TO HIGH TEMPERATURE. Journal of Engineering Science and Technology, 2018. Effects of Adding Waste Plastics on Some Properties of High Performance Concrete.

The ultrasonic pulse velocity (UPV) method was applied to detect flaws and characterize the properties steel fiber reinforced self-compacted concrete. This method is used to measure the time required for the ultrasonic wave to travel through the test material and energy attenuation.

Ultrasonic Pulse Velocity Method: This technique determines the velocity of a pulse of vibrational energy through a slab. The ease at which this energy makes its' way through the slab provides measurements regarding the concrete's elasticity, resistance to deformation or stress, and density.

Also classify the quality of concrete if Ultrasonic Pulse velocity is 3.0km/sec D Why and how rebound hammer is used for concrete Question : O#3 А What do you mean by the workability of concrete; why do we need workable concrete [7] B various properties of aggregates affect workability of concrete? [7]

indicates a linear relation between strength and velocity. The ultrasonic pulse velocity method is a stress wave propagation method that involves measuring the travel time, over a known path length, of a pulse of ultrasonic waves. The test method for pulse velocity through concrete is described in ASTM C597 [7]. The pulses are

Ultrasonic techniques are a simple, cost-effective, portable and non-destructive approach for evaluating the uniaxial compressive strength (UCS) of rocks. However, there are a number of factors affecting the ultrasonic pulse velocity ( V p) values. The main factors controlling the reliability of the method are surface irregularities of rock, micro-cracks and discontinuities, moisture content

Nondestructive evaluation (NDE) -- including hammer sounding, rebound hammer, ultrasonic pulse velocity, covering thickness, and half-cell corrosion potential analyses -- were performed in the comprehensive study to determine cause(s) of concrete degradation and TO ascertain the degree of deterioration.

concrete can be evaluated using ultrasonic pulse velocity technique which is a non-destructive method of testing [2]. It uses the basic principle of determining time taken by an irrational pulse to travel a known distance through a concrete [3]. Ultrasonic pulse velocity of concrete is used to predict compressive strength [4, 5].

Pulse velocity tests can be carried out on both laboratory-sized specimens and completed concrete structures, but some factors affect measurement: ultrasonic pulse velocity tests have a

Ultrasonic Pulse Velocity (UVP) UPV is used to estimate the depth of surface cracks, estimate concrete quality over large thicknesses (greater than 12 inches), estimate the extent of honeycom , and compare the wave speed of cylinders versus field concrete for estimation of compressive strength.

ULTRASONIC ASSESSMENT OF CONCRETE STRENGTH AT EARLY AGES. This paper describes tests carried out to examine the relationship between ultrasonic pulse velocity and cube strength of concrete from ages of about 3 h over a curing temperature range from 1 to 60 degrees C.

The transducers must not touch the reinforcement bars in the concrete; as the assumption of this method is that the material must be homogeneous, isotropic and elastic; Determining the Quality of Concrete Grading by using pulse velocity. Above 4.5 km/sec Excellent. 3.5 to 4.5 km/sec Good. 3.0 to 3.5 km/sec Medium. Below 3.0 Doubtful.

Elastic modulus of concrete is directly measured by the static uniaxial compressive test in accordance with ASTM C469 [4], which is called static elastic modulus. Elastic modulus of concrete can be determined by dynamic test methods such as ultrasonic pulse velocity and resonance frequency tests [9].

wave velocity. When the velocity reduction is 10% to 25% the concrete rating is defined as “questionable”, while a larger reduction characterizes poor quality or contaminated concrete. California Department of Transportation (Caltrans) bases its classification on both FAT and pulse shape and amplitude.

Rev. ed. of: CRC handbook on nondestructive testing of concrete. c1991. Note. Also available on the Internet to registered users. Note. Available online to Stanford-affiliated users. Related Work. CRC handbook on nondestructive testing of concrete. ISBN. 0803120990 (acid-free paper)

Investigation was carried out to study the effects of maximum aggregate size (MAS) (12.5mm, 19.0mm, 25.0mm, 37.5mm, and 50.0mm) on ultrasonic pulse velocity (UPV) of concrete. For investigation, first class bricks were collected and broken to make coarse aggregate.

using ultrasonic waves velocity are particularly interesting because of the direct relationship between characteristics of wave propagation and the stage of damage to the material [22]. Ultrasonic Pulse Velocity (UPV) method is most commonly used to detect the quality of concrete,

Prediction of Compressive Strength Using Ultrasonic Pulse Velocity for CLSM with Waste LCD Glass Concrete 693 Fig. 1 Glass sand composition curve. indicating that the UPV tends to increase with increasing waste glass content and maintenance age. However, after a period of time, the increase of the ultrasonic pulse velocity tends to become smooth.

consolidating concrete (SCC) and conventional vibrated concrete (VC) react similarly to some of the most commonly used tests for strength estimation, such as rebound hammer, ultrasonic pulse velocity (PV), and core drilling. The areas compared include the type of fit and correction factors

Application of Schmidt rebound hammer and ultrasonic pulse velocity techniques for structural health effects of variable factors such as admixtures on strength and homogeneity of the concrete. (mpa) Pulse velocity (m/s) Concrete compressive strength (MPa) 1 07 1 2 4.6 0.5 25.3 4010 25.54 2 07 1 1.75 2.62 0.44 39.8 4154 35.87 3 28 1 1.75

This complexity makes the behaviour of ultrasonic waves in concrete highly irregular, which, in turn, hinders non-destructive testing (Prassianakis & Giokas, 2003). The velocity of ultrasonic pulses traveling in a solid depends on the density and elastic properties of the material. It is thou ght that ultrasonic pulse velocity can often be

The main objective of this research is to investigate the effect of water content in concrete on the velocities of ultrasonic waves (P- and S-waves) and mechanical properties (elastic modulus and compressive strength) of concrete. For this study, concrete specimens (100 mm × 200 mm cylinders) were fabricated with three different water-to-binder ratios (0.52, 0.35, and 0.26).