College - Author 1

College of Agriculture, Food and Environmental Sciences

Department - Author 1

BioResource and Agricultural Engineering Department

Degree Name - Author 1

BS in BioResource and Agricultural Engineering



Primary Advisor

Shaun Kelly


The project encompassed the design and fabrication of a concrete washout bin. The design parameters were provided by feedback from multiple professors who have used the current concrete washout area, and would like a newer, more effective washout bin to use for multiple lab sessions throughout the school year. The concrete washout bin needed to be large enough to hold excess amounts of waste materials, yet include a low profile to aid the students in being able to clean multiple mixers and tools. A liner will be held in place to ensure that water does not leak out, but also to help in the dumping of the washout, which will take place at the Cal Poly Recycling Center.

The design for the concrete washout bin was completed in SolidWorks. This program provided a 3D model of the prototype, which was used to piece together and size out the various components of the washout. The program also allowed modifications to be made throughout the design process, which was vital in a project such as this. A durable steel frame was constructed using 10-gauge sheet metal, with inside dimensions of four feet by ten feet and a height of 6 inches. Three of the sides created 90-degree angles with the bottom portion, while the fourth side was bent at a 53-degree angle, thus allowing the user to dump the washout with a forklift and allow the contents to slide out of the washout. One inch square tubing was welded around the top edge of all four sides, with one and a half inch steel channel placed over the one inch square tubing in order to hold the plastic liner in place during usage. Two separate three inch by eight inch rectangular tubes were welded to the bottom of the structure, and spaced 29 inches apart to allow the various forklifts to pick up the washout. Two separate three inch by four inch rectangular tubes were also welded to the bottom to aid in supporting the concrete washout on the ground. Finally, a hook made with 3/8” steel was welded to the backside of the washout to allow the washout to be latched to the forklift when the washout is dumped. The concrete washout bin was designed for a maximum capacity of 20 cubic feet of waste materials.

The concrete bin was painted and installed at the BRAE department. The large capacity almost triples the previous amount of storage, thus becoming a more useful tool. Furthermore, the technique for keeping the plastic liner in place will aid in the concrete washout successfully doing its job, which is to prevent waste water from entering the environment.