Concrete Defects - Spalling

Spalling is one of the most serious and recognizable forms of concrete deterioration. What often begins as localized surface damage can progress into exposed reinforcement, accelerated corrosion, reduced durability, safety hazards, and costly structural repairs if left untreated.

The Spalling Field Reference was developed to help inspectors, contractors, technicians, engineers, and concrete professionals identify spalling, understand its root causes, assess severity, and determine the appropriate repair and prevention strategies.

Using real-world examples, practical field guidance, severity classifications, inspection checklists, escalation triggers, and repair recommendations, this reference transforms a common but often misunderstood defect into a clear and actionable field assessment.

Inside This Reference:

• Learn how to identify spalling and distinguish it from scaling, delamination, pop-outs, honeycombing, and other concrete defects.

• Understand the most common causes of spalling, including reinforcement corrosion, freeze-thaw damage, impact loading, overload conditions, fire exposure, poor cover, and durability-related deterioration.

• Recognize warning signs such as surface breakouts, exposed aggregate, exposed reinforcement, rust staining, cracking, and progressive material loss.

• Understand how spalling affects durability, serviceability, structural performance, and long-term maintenance costs.

• Assess severity using simple Minor / Moderate / Severe classifications.

• Apply the Universal Escalation Rule to identify conditions requiring additional investigation.

• Use a quick field decision process to determine when monitoring, patch repair, structural repair, replacement, or engineering evaluation may be appropriate.

• Review practical repair options based on defect depth, extent, and cause.

• Learn prevention strategies that reduce the likelihood of future spalling and durability-related deterioration.

• Utilize the included field inspection checklist for evaluations, documentation, and reporting.

• Reference applicable ASTM, ACI, ICRI, and industry guidance related to concrete durability, repair, corrosion, and structural assessment.

Designed For:

• Concrete Inspectors

• Quality Control Technicians

• Ready-Mix Producers

• Contractors & Superintendents

• Engineers & Project Managers

• Concrete Testing Personnel

• Facility Owners & Maintenance Personnel

• Construction Professionals

• Bridge, Parking Structure, and Infrastructure Personnel

Whether you're evaluating a bridge deck, parking garage, industrial facility, pavement, structural member, retaining wall, or reinforced concrete structure, this reference provides practical field guidance to help determine the cause, severity, and appropriate corrective action for spalling-related deterioration.

Part of the Concrete Defect Field Reference Series — professional field references designed to help identify, assess, repair, and prevent common concrete defects and deterioration mechanisms with confidence.

Identify. Assess. Repair. Prevent.

Understand why concrete spalls, recognize critical warning signs before deterioration accelerates, and make informed repair decisions that help protect both structural integrity and long-term service life.