Automatic Correction Of Impact Direction Schmidt Concrete Test Hammer

Integrated Digital Schmidt Hammer HT-225D with optional microprinter

Introduction

HT-225D is is specifically applicable to the on-site quality sampling inspection by Engineering Quality Supervision Institutions and Supervising Units, for the compressive strength test result of the inspected concrete structure can be got immediately; when the Construction Quality Testing Institution carries out on-site test for real construction objects, it can further reflect the fairness, scientificity and accuracy of the test, greatly improving the working efficiency of testing, data processing and inspection report formation.

Structure of Concrete Test Hammer

The Concrete Test Hammer is mainly composed of flip system, value-indicating system and shell component．Its structure is shown in Fig．1． The diagram shows the state that the impact hammer has finished impact in the test and the pushbutton has locked the movement,ie．retaining state of resilience value．

Key features

High contrast OLED display

All setup can be made on site

Automatic calculating compressive strength

Automatic correction of impact direction

All data will be stored in memory

All data can be transferred to PC by USB cable or blue tooth(optional)

Dual display for analogue ruler and digital value

Specifications

Specification

.Mechanical Index of Rebound Apparatus

Metrological verification specifications : Verification Regulations of Rebound Apparatus(JJG_817-2011)
Impact energy : 0.225kgm (2.207J±0.100J), for testing ordinary building and bridge construction

Rigidity of recoiling tension spring : 785±30.0N/m
Length of pointer : 20.0±0.2mm
Friction of pointer : 0.65±0.15n
Spherical radius of recoiling rod : R25±1.0
Active length of recoiling tension spring : 61.5±0.3mm
Impact length of recoiling rod : 75.0±0.3 mm
Initial bouncing position of recoiling hammer : graduated scale“0”+1
Calibration value on steel anvil : 80±2
Graduating position “100” of shell calibration: overlap with the side of positioning gap of calibrator cover plate of the rebound apparatus.
Consistency of test indicating value : ≦±1
Operating Temperature : -4ºC-+40ºC