ASTM C1857/C1857M is the ASTM standard for evaluating the adhesion (pull-off) strength of concrete repair and overlay mortar. It provides a focused test method for assessing how well a repair or overlay mortar bonds to the concrete substrate, which is an important indicator of in-place performance. For projects where surface repair or overlay systems must remain securely attached, this standard helps support more consistent testing, comparison, and quality decisions.

Purpose of ASTM C1857/C1857M

The purpose of this standard is to define a repeatable method for measuring pull-off adhesion strength in concrete repair and overlay mortar applications. By using ASTM C1857/C1857M, users can evaluate bond performance in a controlled way and compare results across materials, jobs, or test locations. The method is especially useful when adhesion is a key acceptance or qualification factor for repair systems. As a technical document, it supports more objective performance assessment than visual inspection alone.

Common use cases of ASTM C1857/C1857M

This standard is commonly used when checking the bond of repair mortars or overlay mortars applied to existing concrete surfaces. It may be used during product evaluation, field quality control, or project acceptance testing where adhesion strength matters. ASTM C1857/C1857M is also relevant for comparing mortar formulations, verifying installation performance, and documenting compliance with project specifications. In practice, it supports testing workflows built around pull-off equipment and other adhesion measurement tools.

Why ASTM C1857/C1857M matters

Adhesion failure can compromise the service life of a repair or overlay, so having a recognized test method matters for both performance and risk reduction. ASTM C1857/C1857M gives engineers, specifiers, and contractors a common basis for evaluating bond strength and making procurement or acceptance decisions. It can improve consistency in reporting and help reduce disputes by aligning test results with a clearly defined ASTM standard. That makes it a practical tool for quality control and compliance-focused work.

• Pull-off adhesion strength measurement
• Concrete repair and overlay mortar evaluation
• Field and laboratory quality control
• Performance comparison and acceptance testing
• Bond assessment for repair systems