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• <br />C <br />• <br />project such as nails, petroleum jelly, garbage bags, rubber gloves and duct tape. We purchased the <br />supplies using the City of Elk River account. <br />Preparation and mixing of the Concrete <br />This was the most important and time consuming tasks in my project. <br />It was time consuming because we had to measure each batch and we <br />needed to mix enough concrete for six separate mile markers. In <br />order for the concrete to be a self - consolidating type concrete — very <br />smooth with no abrasions or noticeable imperfections- we had to use <br />an exact mixture of concrete chemicals and aggregate. This was <br />supervised and measured by John Kallemeyn who would direct all of <br />the volunteers in the exact quantities needed in the mixing of the <br />concrete. <br />The chemical materials required and the timing of the mixture in the <br />concrete mixer was calculated by John using the concrete mix <br />evaluator (Exhibit Q. John would show all of us how important it <br />was to design the exact amount of air, chemical and water in the <br />concrete. After the mixing was complete, John would test the <br />concrete by measuring the water content. John would show me how to <br />test the concrete and I was able to test the last two molds by myself. If we <br />satisfied by the results of water density, then we would stop the mixing ar <br />prepare for pouring of the concrete into the mold. <br />a <br />Pouring concrete into mold <br />Before pouring concrete into the mold we had to clean the inside of the mold and attach the rubber <br />letters and number onto the mold by measuring their exact locations. We would then place four re- <br />bar over four feet in length in the mold to strengthen the concrete. We would take the concrete from <br />the mixer with a pitcher and then pour the concrete into the sono tube. <br />The sono tube would assist in a <br />smooth pour to the bottom of the ,$ . <br />mold. As the concrete was settling <br />I■�`ia.... �„r,..Y into the mold, we would use rubber€ <br />mallets hitting the mold to minimize <br />air in the concrete. <br />At the end of pouring concrete, I <br />would instruct all of the volunteers <br />to clean all of the materials and tools. <br />We would use water to clean <br />everything in the lab. <br />Aw. <br />a <br />0 <br />■ <br />