混凝土收縮測(cè)量?jī)x　　ShrinkagemeasurementofconcreteandmortarnormalizedprismsDescription-PrincipleConcretedryingshrinkagecanbemeasuredinlaboratory

混凝土收縮測(cè)量?jī)x　　

Shrinkage measurement of concrete and mortar normalized prisms

Description - Principle

Concrete drying shrinkage can be measured in laboratory. The American Concrete Institute (ACI) 302 Guide for Concrete Floor and Slab Construction recommends following ASTM C157 “Standard Test Method for Length Change of Hardened Hydraulic-Cement". In this way, CAD Instruments developed and offers 2 devices for measuring the length variation of concrete or mortar prism along drying time. These 2 instruments, called retractometer 混凝土收縮測(cè)量?jī)xRE101040 and 混凝土收縮測(cè)量?jī)xRE4416, are robust and accurate to control specimens according to ASTM C151, ASTM C490, BS 1881, EN 1367-4, EN 12617-4, NF P15-433 and NF P18-427 norms.

混凝土收縮測(cè)量?jī)xSpecifications

• Measurement of dimensional variation of mortar or concrete specimens of 16 cm (混凝土收縮測(cè)量?jī)xRE4416) or from 10 to 40 cm (混凝土收縮測(cè)量?jī)xRE101040)

• Repeatability: < 0.15 µm

• Linearity: 0.5% of full measurement scale

• Thermal variation coefficient: < 0.01% of full measurement scale per °C

• High precision digital display

• RS 232C interface for computer control

• Dimensions: 250 x 250 x 600 mm

• Weight: 35 kg

Studs ａnd INVAR calibration bars are also available.