Decarbonizing Cement in the Southwest

Oak Grove Sustainable Cement Alternatives Project

Traditional cement accounts for about 8% of global emissions, but this project reduces that impact by replacing carbon-intensive Portland cement with lower-carbon alternatives made from harvested bottom ash and fly ash. The result is durable, long-lasting concrete that not only cuts greenhouse gases but also builds stronger, more resilient infrastructure for local communities.

The Oak Grove Harvested Bottom Ash Project focuses on reducing emissions from cement production by developing sustainable supplementary cementitious materials (SCMs). The project involves harvesting, milling, drying, and blending bottom ash (BA) with fly ash (FA) to create high-performance cement replacements that meet ASTM C618 standards. By partially or fully displacing Portland cement, the project lowers the carbon footprint of concrete while improving performance.

Bottom ash is collected, processed, and blended (35–50% BA) with both Class C and Class F fly ash, depending on application needs. Class C fly ash enhances strength and self‑hardening properties, making it ideal for pre-stressed concrete and soil stabilization, while Class F fly ash improves durability, reduces shrinkage, and lowers heat of hydration. Finished materials are tested for quality assurance before being delivered to ready-mix and precast plants via truck and rail transloading. This project has been operational since early 2024.

To learn more about low-carbon cement, please view our press release or read our blog.

Additional details can be found on our Project Information page.