Skip links

Initial Surface Absorption Test.(ISAT).

Our Services

Evaluating the Concrete’s First Line of Defense

Initial Surface Absorption Test (ISAT) is a specific durability test that focuses on a concrete's near-surface characteristics. It measures the rate at which water is absorbed by the surface of a hardened concrete specimen when subjected to a constant, low pressure head of water. The test is required for several key reasons, primarily because the surface layer is the first line of defense against environmental and chemical attacks.

Why ISATMatters.

Evaluates Surface Density & Porosity

ISAT directly measures how quickly water is absorbed at the surface — indicating the compactness and pore refinement of the outer concrete layer, the first barrier against deterioration.

Assesses Curing & Finishing Quality.

The test highlights the impact of curing, finishing, and bleeding on surface performance. Low ISAT values confirm a well-cured, dense concrete, proper finish, while high values signal poor workmanship or inadequate curing.

Predicts Resistance to Environmental Attack

A dense surface with low absorption resists chloride ingress, carbonation, sulfate attack, and freeze–thaw damage — extending the service life of exposed structures.

Surface Treatment & Material Improvement

Engineers use ISAT results to refine mix proportions, improve curing methods, or apply protective coatings — ensuring durable and low-permeability concrete surfaces.

NDT TESTING

GL Advantages.

Accredited Facility: NABL-accredited laboratory with traceable calibration and stringent Quality System procedures.

Compliance with Standards: Tests conducted in accordance with relevant IS/ASTM/RILEM/EN standards.

Experienced Personnel: Technologists and experts who interpret results and recommend mitigation strategies.

Rapid and Reliable Reporting: Valid reports that comply with relevant standards.

Testing Capabilities: Lab and on-site testing, along with post-test consulting services.

Global Lab Advantage.

Accredited facility.
Standards compliance.
Experienced analysts.
Fast, reliable reporting.
Field + Lab capability.

Applications

Bridge decks, coastal structures, and marine works.
Exposed slabs, pavements, and water-retaining structures.
High-performance concrete quality control.
Research and comparative studies on curing and admixtures.
Forensic durability assessments and rehabilitation projects.
View More
Initial Surface Absorption Test
ISAT
Initial Surface Absorption Test

Know More about GL

Ask a Technical Expert
  • Key Aspects
  • Certifications
  • FAQS
✓

NABL Accredited

🔍

Advanced Lab & Field Testing

⚡

Fast Turnaround Reports

📱

Digital Data & Traceability

🚚

On-Site Testing Across India

Global Lab provides comprehensive testing for construction and engineering materials, including concrete, cement, steel, aggregates, bitumen, soil, tiles, paver blocks, and other civil and infrastructure materials. We also handle customized tests as per client or project specifications.

Yes. Our team is equipped with mobile testing facilities and field instruments for on-site sampling, inspection, and testing — ensuring quick and reliable results without disrupting your project timelines.