1 Overview

The non-destructive (including local damage) testing of concrete compressive strength in China has been in progress since the late 1950s. The mature methods to date include rebound method, core drilling method, pull-out method, and ultrasonic rebound comprehensive method, each with its own advantages and disadvantages. The shear compression method is a concrete strength testing method developed by Beijing Tiandi Xinghuo Technology Development Co., Ltd. after years of research by the Chinese Academy of Building Sciences. The shear compression method is a method for detecting micro damage at the corners of components, with high detection accuracy, mild damage, simple operation, and broad application market prospects.

In order to promote the application of shear compression method in engineering construction quality inspection, China's construction industry has formulated the "Technical Specification for Testing Concrete Compressive Strength by Shear Compression Method" CECS278:2010, which is recommended for use by engineering construction, design, construction and other units and engineering technicians. The calculation and estimation methods for measuring concrete strength using a shear pressure gauge should be carried out in accordance with this regulation.

The JY-70 concrete strength shear compression tester is a testing instrument developed by Beijing Tiandi Xinghuo Technology Development Co., Ltd. based on CECS278:2010 "Technical Specification for Testing Concrete Compressive Strength by Shear Compression Method". It is suitable for testing the compressive strength of structural concrete with right angle edges that can apply shear pressure.

The shear pressure gauge is composed of a base frame, slide block, oil cylinder, manual pump, digital pressure gauge, rubber hose, and other parts. The shear pressure gauge has the characteristics of novel structure, stable operation, light weight, simple and fast operation, and high accuracy.

The main functions of the shear pressure gauge digital display pressure gauge are:

1. It has data storage and query functions;

L has peak protection and real-time measurement conversion function;

L has the function of resetting the current value;

Equipped with range setting and calibration functions;

Delay automatic power off function;

High measurement accuracy: The instrument adopts a high anti-interference 22 bit A/D analog-to-digital conversion circuit;

Fast A/D conversion; Convert 16 times per second.

2 Main technical parameters

Shear pressure range 0-70KN

Pressure head diameter 20mm ± 0.1mm

Working stroke 30 mm

Detect the thickness range of structures or components from 80mm to 800mm

Weight 41 kg

Resolution 0.001kN

Accuracy level ≤ 2% F.S

Power supply 9V square battery

Working current ≤ 10 mA

Adapt to ambient temperature -20 ℃ -+50 ℃