| Numer modelu. | CTH-80 | CTH-90 |
|---|---|---|
| Standardowa energia uderzenia | 2,207J | 2,207J |
| Długość wskaźnika | 20.0 ± 0.2mm | 20.0 ± 0.2mm |
| Tarcie wskaźnika | 0,65 ± 0,15 N | 0,65 ± 0,15 N |
| Sztywność sprężyny naciągowej | 785.0 ± 30.0 N/m | 785.0 ± 30.0 N/m |
| Długość robocza sprężyny naciągowej elastycznej | 61.5 ± 0.3 mm | 61.5 ± 0.3 mm |
| Pozycja startowa z młotem odbijającym | Scale "0~1" | Scale "0~1" |
| Wartość kalibracji na kowadle testowym | 78-82 | 78-82 |
| Housing Color | Czarny | Custom Blue (Customizable) |
| Included Accessories | English Manual | English Manual |
| Calibration Chart | Orange Curve Chart | —— |
| Opakowanie | Inner Box + Outer Carton (Black) | Neutral Packaging (Custom Color Box, Custom Label) |
| Packaging Details | Standard black outer carton with inner protective box | Fully customizable packaging: color box, labels, logo |
| Customization Options | Standard model, no customization | Customer logo, color box, label customization available |
| Minimum Order Quantity (MOQ) | Standard (No MOQ restriction) | 200 pcs for customization |
Features of Concrete Test Hammer
Innovative Features of the Mountlaser Concrete Test Hammer Series
High-Quality Spring System
Imported high-quality springs with superior fatigue resistance and aluminum alloy spring seat assembly ensure long-term stability and reliability.
Improved Pointer Design
Improved pointer design with easy friction adjustment ensures stable operation. Pointer length 20.0 ± 0.2mm, friction precisely controlled at 0.65 ± 0.15N.
Durable Casing Structure
Super hard 6061 aluminum alloy casing provides excellent wear resistance. Button reinforced with stretching process for enhanced durability.
recision Movement Machining
CNC machining center ensures precise movement and accurate rebound values. Spring stiffness 785.0 ± 30.0 N/m, operating length 61.5 ± 0.3mm.
Standard Impact Energy
Both models provide standard impact energy of 2.207J. Rebound hammer take-off position at scale "0~1" ensures standardized and comparable test results.
Precise Calibration Value
Calibration value on testing anvil strictly controlled at 78-82, ensuring compliance with international standards and providing reliable concrete strength testing data.
Customization Services
CTH-90 model offers comprehensive customization including client logo, color box, and label customization. Neutral packaging with MOQ 200pcs meets personalized branding needs.
Package
The instrument is equipped with comprehensive standard accessories, including a Rebound hammer, Hand protector silicone hand rest, A grinding stone, One maintenance kit, Pointer slider and buffer spring, and Instrument box.
How does it work?
Principle of the Concrete Test Hammer
The hammer measures the rebound of a spring-loaded mass impacting against the surface of the concrete sample. When the hammer is pushed against a concrete surface, a spring-controlled mass with a defined energy is released to hit a plunger.
Common Questions & Professional Answers
A concrete test hammer (commonly known as a Schmidt Hammer or Swiss Hammer) is a Non-Destructive Testing (NDT) instrument widely used in the construction industry. It assesses the surface hardness of concrete to estimate its compressive strength, making it ideal for evaluating structural quality, uniformity, and determining formwork removal time.
Working Principle: The device contains a spring-loaded steel hammer. When released, it strikes a plunger in contact with the concrete surface. The distance the hammer rebounds is measured as the Rebound Value (R-value). A higher rebound value indicates greater surface hardness.
| Parameter | Specification |
|---|---|
| Standard Impact Energy | 2.207J (Suitable for standard construction concrete) |
| Spherical Radius of Plunger | 25 ± 1.0 mm |
| Calibration Value on Anvil | 78 - 82 |
CTH Series Advantages:
- 1High-Durability Springs: Uses imported premium springs with superior fatigue resistance for long-term stability.
- 2CNC Precision Machining: The core movement is manufactured using CNC machining centers, ensuring high precision in rebound values.
- 3Ergonomic Design: Improved pointer design for easy friction adjustment, housed in a high-strength 6061 aluminum alloy casing.
To obtain reliable data, it is recommended to follow the ASTM C805 standard:
- 1Surface Preparation: The test surface must be flat and free of loose material. Use the included Grinding Stone to smooth the test area.
- 2Test Pattern: Distribute 10-12 test points evenly across an area of approximately 150mm x 150mm.
- 3Avoid Interference: Do not test directly over large aggregates or rebar, as these can cause artificially high readings.
Before any major testing session, calibrate the device on a Standard Calibration Anvil. For the CTH series, the reading should be between 78-82.
No, it cannot. The rebound hammer primarily reflects surface hardness. While it provides a quick estimate of strength, it is significantly affected by environmental factors like moisture and carbonation.
In legal disputes or critical structural inspections, industry standards typically require Core Testing to obtain the definitive in-situ strength if rebound results are questionable.
Measurement results are influenced by several environmental factors:
1. Carbonation: In older concrete, a hard carbonated layer forms on the surface, which can cause artificially high rebound values. It is advised to remove this layer or apply a correction factor.
2. Moisture Content: Moisture reduces surface friction, leading to rebound values that are approximately 10%-20% lower than in dry conditions.
| Environmental Condition | Reading Trend | Recommended Action |
|---|---|---|
| Surface Carbonation | Significantly Higher | Remove carbonated layer or use correction factors |
| Wet Surface | Lower Readings | Ensure surface is dry or maintain consistent moisture |
| Standard Dry Surface | Most Accurate | Follow standard testing procedures |
Mount Laser is a leading integrated manufacturer specializing in surveying instruments and accessories, as well as laser levels and accessories. Headquartered in Changzhou, Jiangsu Province, the company operates a 7,500 m² modern manufacturing facility and employs a dedicated team of over 150 skilled professionals. As a comprehensive solution provider, Mount Laser’s product portfolio spans 13 core categories: Auto Levels, Calibration & Testing Instruments, Prisms, Surveying Accessories, Scanner Targets, GNSS, Surveying Poles, Leveling Staffs, Tripods & Bipods, Line Lasers, Rotary Lasers, Laser Level Accessories, and Agent Sales services. Committed to quality and innovation, Mount Laser serves as a trusted partner to surveying and construction professionals worldwide.
MOUNT LASER (CHANGZHOU) INSTRUMENT CO.,LTD
A Chinese Top-3 Manufacturer in surveying accessories!
12 years experience
FAQs
We are a professional manufacturer established in 1999, exporting worldwide with a strong presence in key markets including South America, Oceania, Western Europe, South Asia, and the Middle East, while continuously expanding into emerging markets such as North America, Eastern Europe, and Africa. With over two decades of industry experience, we deeply understand the diverse needs of customers across different regions and are committed to providing reliable measurement solutions to our global partners.
Mount Laser is a leading manufacturer serving the surveying accessories, construction, GPS, and GNSS industries. Our competitive advantage lies in our integrated production capabilities.
We understand that international buyers often need to test the market first. For standard products, we offer flexible MOQs—small trial orders are welcome. For deep customization projects, MOQ depends on the complexity (e.g., mold development, PCB changes). We are happy to discuss a roadmap that starts with small orders and scales up as your business grows.
Absolutely. As a manufacturer with strong R&D capabilities, we specialize in deep customization services. We can tailor products according to your specific requirements.
We are a manufacturer with in-house trading capabilities (industry & trade integrated). Headquartered in Changzhou, Jiangsu Province, we operate a 7,500 m² modern facility with over 150 skilled professionals. Unlike pure trading companies, we control the entire production process—from R&D and mold design to assembly and quality control—ensuring competitive pricing, stable supply, and full customization flexibility for our global clients.
