ASTM C1791 is the ASTM standard for reducing efflorescence potential in new unit pavement systems. It provides a practical technical guide for addressing the white surface deposits that can appear in concrete or masonry paving installations, helping designers, manufacturers, and installers focus on prevention during planning and construction. By emphasizing good material selection and sound installation practices, the standard supports better appearance, durability, and customer confidence in finished pavement work.

What is ASTM C1791?

ASTM C1791, titled Standard Guide for Reduction of Efflorescence Potential in New Unit Pavement Systems, is a guide rather than a product specification. It is intended to help reduce the likelihood of efflorescence in newly installed unit pavement systems by outlining considerations that may influence moisture movement, salts, and surface appearance. In practice, ASTM C1791 is used as a reference for evaluating materials and installation choices that can affect how a pavement system performs after construction.

Where is ASTM C1791 used?

This guide is commonly used in new unit pavement projects where appearance and surface consistency matter, such as pavements made from concrete units, clay units, or similar segmental systems. It is relevant during design, procurement, and installation planning, especially when project teams want to reduce the chance of visible deposits forming after placement. ASTM C1791 is useful for manufacturers, contractors, specifiers, and quality teams working with unit paving materials and related installation methods.

Why is ASTM C1791 important?

ASTM C1791 helps support more consistent results by giving project teams a shared reference for reducing efflorescence risk. That can matter for compliance, quality control, and product evaluation because surface deposits may affect both appearance and customer acceptance. Using the guide during project planning can also help reduce rework, improve specification clarity, and support better procurement decisions when comparing materials or installation approaches for new unit pavement systems.

• Guidance for new unit pavement systems
• Focus on efflorescence reduction
• Useful during design and installation planning
• Supports quality control and appearance management
• Relevant to pavement material and system selection