Product Overview

The KR‑225 series concrete rebound hammer is a portable non‑destructive testing instrument for estimating the in‑situ compressive strength of hardened concrete components. This product line covers three variants: KR‑225A mechanical analogue type, KR‑225B high‑end integrated digital model and KR‑225C basic digital version. It performs quick on‑site inspection for beams, columns, floor slabs, bridge decks and other structural concrete members, applicable for concrete strength grades ranging from C50 up to C100.

Working on the spring‑impact rebound principle, the tester derives concrete compressive‑strength by measuring the rebound value after the impact plunger strikes the concrete surface. The whole series complies with GB/T79138‑2015 and JGJ/T23‑2011 concrete strength‑detection specifications. It is extensively adopted by construction‑site QC teams, building‑engineering institutes, highway‑bridge departments and third‑party construction‑material‑assessment laboratories.

Core Product Competitive Advantages

1. Multiple Variant Options To Fit Different‑Level Demands

• KR‑225A Mechanical Version: Premium stainless‑steel housing, purely mechanical structure without power supply requirement, straightforward dial‑scale reading; ideal for cost‑effective field spot‑check work, service life reaches approximately 8 000 impacts.
• KR‑225B High‑End Digital Model: Aluminum‑alloy and ABS composite enclosure, built‑in high‑definition LCD screen, imported impact spring, supports PC data‑export, up to 120 000 effective testing times.
• KR‑225C Basic Digital Version: Cost‑optimized digital configuration, simple button‑driven operation, direct strength‑value conversion on‑device, supports computer connection, rated for 100 000 testing cycles.

2. High‑Precision Mechanical‑Impact Assembly Imported high‑performance impact spring delivers nominal 2.207 J (0.225 mkg) kinetic‑energy output. Stable spring‑stiffness and standard steel‑anvil rebound‑calibration value guarantee repeatable test outcomes, lowering manual‑reading errors compared with traditional manual hammers.
3. Powerful Digital‑Model Functional Characteristics Back‑lit LCD directly shows rebound reading and converted concrete‑strength value after single impact test. Built‑in large‑capacity memory preserves massive field‑test datasets. USB 2.0 high‑speed interface enables driver‑free data transmission toward computers for report generation and printing. Low‑battery warning function prevents data loss caused by insufficient power. Operated with ordinary No. 5 batteries for convenient field‑site power‑supply.
4. Light‑Weight Portable Field‑Oriented Design Compact handheld form factor, easy to carry to high‑rise building floors, bridge‑deck and narrow construction‑site locations. No specimen cutting or sample‑destruction required during non‑destructive‑testing procedures.
5. Standard‑Compliant Traceable Calibration Every unit passes factory metrology‑verification. Users can conduct periodic calibration with standard steel‑anvil blocks to sustain long‑term measuring accuracy.

Complete Technical Parameter Table

表格

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Inspect instrument appearance and impact‑plunger flexibility. Verify reading zero‑point; complete calibration check on standard steel‑anvil block if necessary. Select proper variant according to test‑site requirements.
2. On‑Site Concrete‑Surface Preparation Clear away dust, loose mortar and surface coating from concrete‑testing area; keep test spot flat and solid.
3. Impact‑Testing Operation Hold the rebound‑hammer perpendicular against concrete surface. Apply steady axial thrust until internal spring releases impact automatically. ‑ Mechanical‑type: record rebound‑scale reading directly. ‑ Digital‑type: LCD screen auto‑displays rebound‑value and converted strength‑index, save data as required.
4. Multi‑Point Sampling & Result Calculation Finish multiple‑spot impacts on the designated testing zone, eliminate abnormal data points, compute average rebound‑value, then convert to concrete compressive‑strength according to standard‑provided curves.
5. Post‑Work Storage Retract impact‑plunger back to home‑position. Wipe instrument surface clean, place into protective carrying‑case. For digital‑models, export stored test data to computer for archiving and report‑printing.

Wide Industrial Application Scenarios

High‑Rise‑Building Construction‑Sites

Non‑destructive strength spot‑check for cast‑in‑place concrete beams, columns and floor slabs for construction‑quality acceptance.

Highway & Bridge‑Engineering Projects

Field strength‑evaluation for bridge‑deck, pier and girder concrete components.

Building‑Structure‑Reinforcement‑Renovation Projects

Concrete‑strength assessment for existing old‑buildings prior‑to‑reinforcement reconstruction.

Precast‑Concrete‑Component Factories

Quick‑strength screening for pre‑fabricated concrete parts during production‑process.

Third‑Party Construction‑Quality‑Supervision‑Organizations

Carry‑out standard‑compliant non‑destructive inspection and issue official test‑records for engineering‑project‑audit purposes.

Standard Factory‑Full‑Delivery Kit

1. KR‑225 series rebound‑hammer main‑unit (choose A/B/C version)
2. Standard steel‑anvil calibration‑block
3. Protective hard‑carrying‑case
4. USB data‑cable & analysis‑software CD‑ROM (digital‑model only)
5. Multilingual printed‑operation‑manual complying with JGJ/T23‑2011
6. Factory‑issued metrology‑calibration‑certificate

Global Distributor & After‑Sales‑Support

We deliver remote operational guidance covering sampling‑point‑selection, calibration‑anvil usage and digital‑data‑export procedures. Spare‑parts stock includes impact‑springs, plunger tips and LCD‑screen assemblies. Bulk‑purchase customers are offered OEM private‑label customization service. Regional exclusive‑agent privileges include priority‑production scheduling and complete‑set HD marketing‑image resources.

Product‑Banner‑Marketing‑Slogan

KR‑225 Series Concrete Rebound Test Hammer | Portable NDT Instrument For On‑Site Concrete Compressive‑Strength Assessment

Core‑Feature‑Labels‑For‑Product‑Images

Schmidt‑Type Rebound NDT Tester | Mechanical / Multiple‑Digital‑Version Optional | 2.207J Nominal Impact‑Energy | USB Data‑Export (Digital‑Type) | Complies JGJ/T23‑2011 | Hand‑Held Light‑Weight Field‑Use

Safety‑Operation‑Reminder

Maintain strictly perpendicular pressure during impact testing; avoid oblique‑angle operation which will cause measuring deviation. Protect plunger tip from heavy‑knock impact.