Introduction: Concrete Phone Holder

About: In Love with design, engineering and science. Please check out my Instagram page @zacsdesigns_ Feel free to request a project and ill see what I can do. I also sell a range of products so inbox me on my accou…

What inspired me?

Well, I love obscure, weird and impractical materials such as concrete while incorporating the material into a project where its features, properties and function isn't required. I love concrete as its such an industrial material and has a very smooth finish.

What will you need?

- Duplex board

- Ply wood (3-5mm)(80mm by 100mm)

- Scissors

- Stanley knife

- Coping Saw

- sand paper

- Hot Glue Gun, and glue sticks

Step 1: The Mould

Step one - Making the mould

The mould consists a piece of ply wood, and duplex board. Remember to fold the card such that the surface with the graphics on should be facing up.

I have added a diagram of the type of mould I uses. Feel free to check that out. If not, then here it is. Draw a trapezium that is 3cm high, with a bottom of 5.5cm and a top of 4.5cm. Add on a rectangle at the end that is 4.5cm that is 5.5cm by 15cm. Add a rectangle to the side of the trapezium that is 5.5cm. Make it 5.5cm by 13cm. Add a rectangle to this side that is 5.5cm by 13cm. Its now time to create the side panel. Do this by drawing the template provided.

Step 2: Mixing the Concrete

Step two - Mixing the Concrete

Before you mix in the sand with the cement and water, it's best to mix the cement and the water. First, place the cement mix in the container. Add about 20ml of the water in small intervals, this will allow you to ensure you dont make any errors.

Its now time to add the sand. Never put in all of the water in one go. You will need to add about 100g then stir. Complete this step until the mix becomes like cookie dough. If you add too much or too little you will end up with a weak mix.

Step 3: Pouring the Concrete and Finishing

Step three - Pouring the concrete

Place some of the concrete bit by bit until 1/4 of the mould is full. Tap gently just to release a few bubbles caught in the bottom. This also helps the concrete spread. Place more of the concrete mix into the mould until it is half full. Place the Ply wood into the slot and then continue to add concrete until you have reached your limit.

After one of two days, the concrete should have set. However, It takes 28 days to get to its full strength. Be careful when taking off the mould. I used a small file to get rid of bits of concrete that I didn't want and used sand paper to get rid of flashing.

Step 4: Finished!


Thank you so much for reading this Instructable, even if you clicked onto the by accident thank you. Every view counts. I love these mini projects as it gives you people, my viewers a quick and simple project to try at home, please feel free to comment, follow and favourite for more amazing Summer DIY projects like this one.

Makerspace Contest

Participated in the
Makerspace Contest

Summer Fun Contest 2016

Participated in the
Summer Fun Contest 2016