Ultrasonic concrete rebound hammer two methods comprehensive testing the compressive strength

Then the tubular casing of hammer is pushed towards concrete, so that the spring gets wind up around the plunger iii. Now release the mass attached to plunger using dash pot, so that hammer will impact on concrete surface and rebound back depending on strength of concrete. iv. Due to backward motion of hammer, pointer on graduated scale will ...

Compressive strength is probably one the most crucial properties of concrete material. For existing structures, core samples are drilled and tested to obtain the concrete compressive strength. Many times, taking core samples is not feasible, and as a result, nondestructive methods to examine the concrete are required. The rebound hammer test is one of the most popular methods to estimate ...

The correlation between concrete strengths and UPV determined by earlier researchers [9,10] were generally limited to the specimens prepared in laboratory conditions. Different correlation formulas were developed for different concrete mixture ratios. Amasaki S. [11] used rebound hammer method for the determination of strength of concrete ...

The experimental process using Ultrasonic Pulse Velocity and Schmidt Rebound Hammer as Non-destructive Tests (NDT) are used in this paper to set up a correlation between the compressive strengths of compression tests and NDT values. These two tests have been used to find out the concrete quality by applying regression analysis models between ...

Ultrasonic pulse velocity method consists of measuring the time travel of an ultrasonic pulse passing through the concrete to be tested. ii. The pulse generated circuit consists of electronic circuit for generating pulses and a transducer for transforming these electronic pulses into mechanical energy having vibration frequency in the range of ...

Effect of properties of coarse aggregates on compressive strength of concrete. i. Size of aggregate: If coarse aggregate particles are of large size (say 20 mm) in concrete mixture , then concrete becomes harsh and only strength may reduce due to honey combing. But if coarse aggregate are of smaller sizes only (say 10 mm).

Test Procedure: i. Clean the mould from inside and apply oil to it. ii. Place the mould on smooth horizontal, rigid & non-absorbent surface or the centre of metallic tray. iii. Fill the mould with the concrete to be tested in four layers, tamping each layer 25 times with the tamping rod, taking care that the strokes are evenly distributed over the c/s. iv. Remove the mould by one smooth ...

Then the tubular casing of hammer is pushed towards concrete, so that the spring gets wind up around the plunger iii. Now release the mass attached to plunger using dash pot, so that hammer will impact on concrete surface and rebound back depending on strength of concrete. iv. Due to backward motion of hammer, pointer on graduated scale will ...

Compressive strength is probably one the most crucial properties of concrete material. For existing structures, core samples are drilled and tested to obtain the concrete compressive strength. Many times, taking core samples is not feasible, and as a result, nondestructive methods to examine the concrete are required. The rebound hammer test is one of the most popular methods to estimate ...

The correlation between concrete strengths and UPV determined by earlier researchers [9,10] were generally limited to the specimens prepared in laboratory conditions. Different correlation formulas were developed for different concrete mixture ratios. Amasaki S. [11] used rebound hammer method for the determination of strength of concrete ...

The experimental process using Ultrasonic Pulse Velocity and Schmidt Rebound Hammer as Non-destructive Tests (NDT) are used in this paper to set up a correlation between the compressive strengths of compression tests and NDT values. These two tests have been used to find out the concrete quality by applying regression analysis models between ...

Ultrasonic pulse velocity method consists of measuring the time travel of an ultrasonic pulse passing through the concrete to be tested. ii. The pulse generated circuit consists of electronic circuit for generating pulses and a transducer for transforming these electronic pulses into mechanical energy having vibration frequency in the range of ...

Effect of properties of coarse aggregates on compressive strength of concrete. i. Size of aggregate: If coarse aggregate particles are of large size (say 20 mm) in concrete mixture , then concrete becomes harsh and only strength may reduce due to honey combing. But if coarse aggregate are of smaller sizes only (say 10 mm).

Test Procedure: i. Clean the mould from inside and apply oil to it. ii. Place the mould on smooth horizontal, rigid & non-absorbent surface or the centre of metallic tray. iii. Fill the mould with the concrete to be tested in four layers, tamping each layer 25 times with the tamping rod, taking care that the strokes are evenly distributed over the c/s. iv. Remove the mould by one smooth ...