California producers and state engineers are working together to find economical ASR mitigation. Alkali-silica reactivity (ASR) has been recognized as a potential problem in portland cement concrete since the 1930s. ASR has become a major concern of the California Department of Transportation (Caltrans) in recent years, and the agency's continuing efforts to prevent ASR-related deterioration are placing concrete producers in a difficult position. A Caltrans decision to implement a standard special provision and change order produced a significant concrete industry response. Cement, aggregate, and concrete trade associations have joined to work with Caltrans to research the ASR problem. Here's how the partnership is working to focus on areas where ASR is a true contributor to concrete failure. KEYWORDS: alkali-silica reaction, ASR, partner