Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Sluys Current Assignee (The listed assignees may be inaccurate.
Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/491,937 Inventor Wesley W.
#Concrete float pdf
Google Patents Concrete marine float and method of fabricatingĭownload PDF Info Publication number USRE31984E USRE31984E US06/491,937 US49193783A USRE31984E US RE31984 E USRE31984 E US RE31984E US 49193783 A US49193783 A US 49193783A US RE31984 E USRE31984 E US RE31984E Authority US United States Prior art keywords concrete core float deck transverse Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents USRE31984E - Concrete marine float and method of fabricating The challenge is to come up with the optimum ingredients to make your team’s canoe lightweight, durable, and aesthetically pleasing.Īre you interested in learning more about concrete canoes? Check out the official rules or visit 31984E - Concrete marine float and method of fabricating Rather than pouring it into a form, it is hand-packed onto a mold. Our concrete is generally not very fluid and has a consistency more like cookie dough. The concrete we make for these concrete canoes is quite different than the normal concrete you would see. The consistency of our concrete is much different than traditional concrete The end result is a concrete that is light-weight and relatively durable. What we do is remove the aggregates and replace them with very small recycled glass beads (some are about 10% the density of water) to decrease the overall weight of the concrete. Intuitively, when you combine these ingredients, you get some final product that is much heavier than water. Cement is about three times as dense as water and aggregates are generally about twice as dense as water. Note that all of the ingredients to concrete are pretty heavy. I wouldn’t pick up a bag of flour and refer to it as cake, so please don’t point at the sidewalk and refer to it as cement. chemically alter it), and then get a delicious cake in the end. You add flour to a mixture of ingredients, bake it (i.e. It is analogous to using flour as an ingredient for cake. Note that cement is an ingredient to concrete and it chemically changes from a powdered substance to a hardened construction material when mixed with water and cured over time. Concrete is made from three main ingredients: cement, water, and aggregates (gravel, sand, etc). To explain how we achieve this, we must start by talking about the basics of concrete. However, unlike these old warships, our concrete is actually designed to be less dense than water so they float when completely submerged. They have a national competition to determine who can build the most efficient canoe from concrete. So now the question remains: why do civil engineering students make canoes from concrete? Well, the only reasonable answer is that ASCE made us do it. Some of the old wartime ships can still be seen today, and Amusing Planet has a great article about these concrete ships. However, ships made from other materials were easier to construct and cheaper to operate, so you don’t see many concrete ships around today. According to Wikipedia, they were also commonly used as barges in Europe in the early 1900s. Surprisingly enough, concrete war ships were constructed during World War I and World War II because of the wartime steel shortage.
Basically, if the weight of fluid displaced by the object exceeds the weight of the object itself, then it floats! But steel is three times as dense as concrete! Archimedes’ principle is the basic reason why these ships don’t sink like bricks.
I realize conventional concrete is a dense material, but have you ever thought about a steel ship? Most large boats are made from steel (think: cruise ships, aircraft carriers, and cargo ships). It’s funny that so many people are in awe about the idea of a concrete vessel. This competition requires engineering students across the world to design and construct canoes from concrete and battle head to head in paddling, aesthetics, a technical design paper, and an oral presentation. As a long-time participant of the ASCE National Concrete Canoe Competition, I think this is the most common question I get from outsiders. Like, it can be submerged in a bucket of water and actually resurface.
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