rebound hammer test report

Impact Energy for Rebound hammer for different Applications. The method may be compared to dropping a large ball-bearing onto a concrete surface.

Application Of Rebound Hammer Method For Estimating Compressive Strength Of Bricks

This test is based on the principle that the rebound of an elastic mass depends on the hardness of the surface against which the mass impinges.

. Students should be able conducted the experiment understanding the theory and recognize the rock strength on different types of rocks in Malaysia. TENSILE AND COMPRESSIVE STRENGTHS OF ROCKS. 20 LEARNING OUTCOMES a To determine a.

The surface of the concrete at the point tested must be smooth dry and free of honey combing. Some of the disadvantages of the rebound hammer test can be listed as follows. The bridge is a 35m long span bridge which connects Samundratar VDC 5 and 6.

How to do Concrete Hammer Test Work. In rebound hammer test a spring loaded mass has a fixed amount of. Disadvantages of rebound hammer test.

The compressive strength can be read directly from the graph provided on the body of the hammer. It is necessary that the rebound hammer is checked against the testing anvil before commencement of a test to ensure reliable results. Apparatus consists of a spring controlled mass that slides on a plunger within a tubular housing.

The spring and probe arrangement will require regular cleaning and maintenance and the flaws cannot be detected with accuracy. The testing anvil should be of steel having Brinell hardness of about 5000 Nmm2. All individual readings should be at least 25 mm 1 inch apart.

To do this the Schmidt hammer is tested against the Steel test anvil which has a Brinell hardness number of about 5000MPa. The concrete should be 14 to 56 days old. The impact energy required for rebound hammers for different applications is given in table below.

The suppliermanufacturer of the rebound hammer should indicate the range of readings on the anvil suitable for different types. The rebound hammer often a Schmidt hammer measures the rebound of a weight from the back of an anvil pushed against the concrete surface. The issue of concrete strength often arises in civil engineering practice either due to quality control of new constructions or due to the assessment of existing structures.

The results are corrected to a horizontal or vertical position using the correction curves provided by the manufacturer. Clean the surface of concrete ensure the concrete is clean and dirt free. 2733 Rebound hammer tests.

Reliance Engineering Consultancy Pvt. Do not test over reinforcement with a cover of less than 20 mm 34 inch. For Rebound hammer Nm 1 For Testing Normal Weight Concrete 225 2 For light-weight concrete or small and impact sensitive parts of concrete 075 3 For testing mass concrete for example in roads air field pavements and hydraulic structures 225 Table 1.

Schmidt Hammer Test Report of Samundratar Bridge Nuwakot Bagmati. The results are obtained based on a local point. Ltd Anamnagar Kathmandu May 2015 Introduction The proposed samundratar bridge is under construction at Samundratar VDC.

If the surface is very rigid ie high modulus the ball bearing would be. How to do Concrete Hammer Test Work. This experiment deals with determination of rock strength when a certain load implied on the rocks.

The impact energy required for rebound hammers for different applications is given in table below. Rebound hammer test lab report. The concrete surface to be tested must be smooth.

Otherwise rebound readings will be low. It weighs about 4 lbs and is suitable for use in laboratory and in the field. Botswana International University of Science and Technology.

SCHMIDT HAMMER REBOUND TEST. Before starting the procedure calibration of the hammer is required. Rebound hammer test lab report.

Description A rebound hammer provides a. If estimating concrete strength takes at least two cores from six locations that have different rebound hammer number. For tests conducted in situ on a rock mass the rebound hammer can be used at any desired orientation provided the plunger strikes perpendicular to the surface tested.

The test result varies significantly with the age of the concrete. Apparatus consists of a spring controlled mass that slides on a plunger within a tubular housing. Take 10 rebound hammer readings at each test area.

Hammer test can provide fairly accurate estimate of concrete compression strength it performed with precautions and co- relations. Rebound hammer test Schmidt Hammer is used to provide a convenient and rapid indication of the compressive strength of concrete. The disadvantages are that the results obtained are based on a local point and it is not directly related to the strength and the deformation property of the surface.

It consists of a spring controlled mass that slides on a plunger within a tubular housing. Carry out rebound test on a calibrated Anvil supplied by. To this aim one of the most widely spread techniques is the rebound hammer Schmidt hammer test for which calibration is still related to the original Schmidt curve dating back to the early.

Parts of the hammer are shown in figure below. Procedure for Schmidt hammer test or Rebound Hammer Test.

Summary Of Rebound Hammer Test Results Download Table