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Abrasive Blasting Case Studies GMA SpeedBlast English Global![](https://gmagarnet.com/hubfs/Featured%20Image%20-%20GMA%20SpeedBlast%20San%20Diego.png)
50% Savings: The results for San Diego bridge blast trial
Overview
Project
Blasting of Bridge
Location
San Diego, California
Task
Blast trial on bridge in San Diego to remove coating from structural steel and beams
Challenge
Low productivity, high dust levels, and achieving surface cleanliness with previous abrasive (10X Abrasive, Oxide Mineral)
Surface Area
25,000 ft² (2,323 m²)
Coating & Structure
Removal of previous 10 mils coating from structural steel and beams, targeting a 2-4mils (50-100µm) profile
GMA SpeedBlast™
Result
The trial of GMA SpeedBlast™ on the San Diego Bridge project demonstrated its advantage over 10X 30/60 Mesh abrasive. Despite a higher per-tonne cost and increased consumption, GMA SpeedBlast™ led to a remarkable improvement in productivity and a significant reduction in overall project costs by 49.2%. Moreover, the project benefited from enhanced safety due to lower dust emissions and cleaner surfaces, facilitating quicker inspection approvals and coating processes.
Total project cost savings
The transition to GMA SpeedBlast™ garnet marked a significant advancement in operational efficiency, setting a new standard for similar future projects.
49.2%
Savings
$79,112
Investment
Using GMA SpeedBlastTM
Trial Outcomes
In determining the solution, some assumptions were developed to provide a comparative but thorough investigation of the total project cost through GMA’s TruCost Calculator. The data entered into the calculator was, as follows:
![Table 2 (797 x 437 px)](https://gmagarnet.com/hs-fs/hubfs/Table%202%20(797%20x%20437%20px).png?width=797&height=437&name=Table%202%20(797%20x%20437%20px).png)
Trial of GMA SpeedBlast™
A comparative trial was conducted between GMA SpeedBlast™ and 10X 30/60 Mesh to evaluate performance. Following were the test results:
![Table 2 (797 x 437 px) (1)](https://gmagarnet.com/hs-fs/hubfs/Table%202%20(797%20x%20437%20px)%20(1).png?width=797&height=259&name=Table%202%20(797%20x%20437%20px)%20(1).png)
Using GMA SpeedBlast™
Productivity
150% or 72ft²
Per hour more efficient
Consumption
20% or 5 tonnes
more abrasive
Labour
15 days or 670 hours
Less labour
![Screenshot 2024-08-14 130759](https://gmagarnet.com/hs-fs/hubfs/Screenshot%202024-08-14%20130759.png?width=791&height=324&name=Screenshot%202024-08-14%20130759.png)
![Screenshot 2024-08-14 130652](https://gmagarnet.com/hs-fs/hubfs/Screenshot%202024-08-14%20130652.png?width=727&height=348&name=Screenshot%202024-08-14%20130652.png)