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Overview

The concrete rebound hammer uses a spring-driven impact hammer to strike the concrete surface through the impact rod, causing instantaneous elastic deformation recovery force. This force drives the hammer to rebound the pointer, indicating the rebound distance. The rebound value (the ratio of the rebound distance to the distance between the hammer and the rod before impact, expressed as a percentage) is used as one of the indicators related to the compressive strength of concrete to estimate the concrete's compressive strength.

With the development of China's economic construction, the number of high-rise buildings in construction projects is increasing, and the use of high-strength concrete is also growing. The demand for using rebound hammers to test the strength of high-grade concrete on-site is becoming more urgent. Therefore, the Ministry of Housing and Urban-Rural Development of China issued the industry standard "Technical Specification for Strength Testing of High-Strength Concrete" (JGJ/T294-2013) and the calibration standard for rebound hammers: the National Metrology Verification Regulation of the People's Republic of China "Concrete Rebound Hammer" (JJG817-2011).

Structure of the Rebound Hammer

1 - Lock Nut
2 - Zero Adjustment Screw
3 - Hook
4 - Hook Cylindrical Pin
5 - Button
6 - Housing
7 - Impact Hammer
8 - Tension Spring Seat
9 - Retaining Ring
10 - Dust Seal Ring
11 - Impact Rod
12 - Front Cover
13 - Buffer Compression Spring
14 - Impact Tension Spring
15 - Scale
16 - Pointer Plate
17 - Pointer Block
18 - Central Guide Rod
19 - Pointer Shaft
20 - Guide Flange
21 - Hook Compression Spring
22 - Compression Spring
23 - Tail Cover

Technical Requirements

1. The instrument used to measure the rebound value must be a rebound hammer with an energy of 5.5 joules, an impact hammer stroke length of 100mm, and an impact rod front spherical radius of 18mm. The rebound hammer must have a manufacturer's certificate of conformity and a calibration certificate from the verification unit, and must have the following marks in a prominent position: name, model, manufacturer (or trademark), factory number, and production date.

2. The rebound hammer must meet the following standard state requirements:

• When striking horizontally, at the moment the impact hammer disengages, the standard energy of the rebound hammer should be 5.5J.

• At the moment of collision between the impact hammer and the impact rod, the impact tension spring should be in a free state, and the starting point of the impact hammer should correspond to the "0" mark on the pointer scale.

• On a steel anvil weighing 20kg with a Rockwell hardness HRC of 60±2, the calibrated value of the rebound hammer should be 83±2.

The ambient temperature for using the rebound hammer should be between -4 and +40°C.

Technical Specifications

1. Standard Energy: 5.5J
2. Working Length of Impact Tension Spring: 86mm
3. Extended Length of Impact Tension Spring: 100mm
4. Stiffness of Impact Tension Spring: 1100N/m
5. Steel Anvil Calibration Value: 83±2
6. Impact Rod Spherical Radius: SR18mm
7. Instrument Weight: 1.28kg
8. Dimensions: Ф54 x 350mm

Company Profile

Hebei Yinfeng Experimental Instrument Co., Ltd. is a high-tech enterprise dedicated to the research and development, production, and sales of experimental instruments. The company is headquartered in Hebei Province, relying on the strong industrial foundation and technological innovation resources in the Beijing Tianjin Hebei region. It is committed to providing high-precision and high reliability testing equipment and solutions for material testing, engineering quality control, scientific research experiments and other fields.

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We provide customers with full-process services ranging from pre-sale consultation, customized solution design, equipment installation and commissioning to after-sale technical support.

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550A High-Strength Concrete Rebound Tester

The concrete rebound hammer is an instrument that uses a spring-driven hammer to strike the concrete surface through a striking rod, generating an instantaneous elastic deformation recovery force. This force causes the hammer to drive a pointer to rebound and indicate the rebound distance. The rebound value (the ratio of the rebound distance to the distance between the hammer and the striking rod before impact, expressed as a percentage) is used as one of the indicators related to the compressive strength of concrete to estimate the compressive strength of the concrete.

Email:

info@cnhblabequipment.com

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+86-15931715356

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