A research brief by MIT CSHUB, “Life Cycle Impacts of Fully-Loaded Ready Mixed Concrete (RMC) Trucks,” explores the economic and environmental effects of allowing RMC trucks to operate at a higher gross vehicle weight (GVW) than the current federal limit. The study proposes increasing the truck’s payload to enhance concrete delivery efficiency and decrease costs per cubic yard. The current federal limit of 54,000 lbs for a standard 3-axle RMC truck leaves little room for payload, limiting a single truckload to about 6 cubic yards, which is nearly 45% less than the vehicle’s capacity. The study suggests that operating above this limit, but within the truck’s design specifications, could be a solution to the industry’s challenges, such as high costs and a driver shortage.
To evaluate the impacts of this change, the study used a software tool that integrates Life Cycle Assessment (LCA) and Life Cycle Cost Analysis (LCCA) frameworks. The researchers modeled a scenario where RMC trucks, which make up 10% of the total truck traffic, carry a 40% additional gross load, bringing their GVW up to 75,600 lbs. The modeling assumed that the total volume of concrete delivered remained constant, meaning that the fully-loaded trucks would make fewer trips to deliver the same amount of material. The analysis period for pavement performance, including its effects on vehicle fuel consumption and maintenance, was set at 50 years.
The key findings from this research show that full-loading RMC trucks provides significant benefits without negative consequences for infrastructure. The study found a 32.5% reduction in fuel use and a 5.6% reduction in life-cycle economic impacts for RMC trucks when carrying up to 40% additional load. The research also found that other trucks on the road were not impacted, and the Pavement Condition Index (PCI) curves remained consistent, indicating no appreciable difference in pavement deterioration compared to the baseline condition. This consistency in pavement degradation means that infrastructure costs for agencies also remain unchanged.
In conclusion, the research suggests that adopting a more flexible, performance-based approach to weight regulations, informed by data-driven models, is a promising path forward. Allowing controlled full-loading of RMC trucks can improve the concrete industry’s productivity, ensure timely delivery, and reduce fuel consumption, GHG emissions, and operational costs. These findings challenge conventional assumptions about the impact of heavier loads on pavements, supporting policies that align economic productivity with environmental and infrastructure sustainability.
Read the full brief here: https://bpb-us-e1.wpmucdn.com/sites.mit.edu/dist/a/1711/files/2025/07/Fully-Loaded-RMC-Trucks-1.pdf