The Auto-Shrink digital dilatometer is designed for linear measurement of autogenous shrinkage (reduction in volume) in hardening cement-based paste or mortar cured under sealed conditions. A special corrugated plastic mold is used to prevent moisture loss and allow the specimen to shrink freely. With Auto-Shrink, it is possible to measure the time dependent deformation of different specimens simultaneously over periods of weeks or even years. Autogenous shrinkage test.

The dilatometer is composed basically of a rigid frame or bench made of Invar, a special steel alloy with a very low coefficient of thermal expansion at room temperature; a high precision digital dial gauge with remote control and reference bar made of Invar as well.

As an option, a dedicated USB input cable and software can be added to connect the gauge to a computer for automatic data-logging. The software allows to read gauges from multiple dilatometers. 

• Quality control of low shrinkage designed mortars, grouts or concrete mixtures
• Research and development
• Assessment of autogenous shrinkage as cause of microcracking

• Support frame and reference bar made of Invar steel alloy
• Absolute type linear encoder Digital Gauge with large, easy-to-read LCD rotating display
• Measuring range: 12.7 mm
• Resolution: 0.001 mm
• Accuracy at 20^oC: 003 mm
• Repeatability at 20^oC: 002 mm
• 8 mm stem with a 1.5 mm spherical tip (carbide tipped)
• Battery life: ≈ 7,000 hours of continuous use
• Service temperature range: 0 to 40°C
• Storage temperature range: 0 to 60°C

Auto-Shrink AS-1000 Kit

Includes:

Optional items for automatic data-logging

Cosumables

• Technical data-sheet 
• Publications

• ASTM C1698, Test Method for Autogenous Strain of Cement Paste and Mortar