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How To Use Concrete Molds [Step By Step Guide]

Concrete molds are beneficial when you do various home projects. For instance, you can replicate fixtures at less cost. Don't worry if you're not familiar with concrete molds. We've gathered information to guide you on how to use them.

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Follow this easy process to use concrete molds:

  1. Prepare the mold and apply a lubricant or mold release agent.
  2. Mix the concrete well to get the right consistency.
  3. Pour the concrete mix into the mold.
  4. Wait for the concrete to dry and take shape.
  5. Carefully remove the mold after curing.

Using molds is easy if you follow the correct procedure. Other than the process, the project results depend on the right concrete mix and drying time. Continue reading to learn more about concrete molds.

man pour cement mold make concrete, How To Use Concrete Molds [Step By Step Guide]

How To Use Concrete Moulds

Concrete molds replicate various objects in your home. You can use simple, readymade molds with common shapes or customize them for specific projects. Using the molds is convenient and cheap because you can do it yourself.

Prepare the following materials before you proceed:

  • Bucket for mixing
  • Concrete mix
  • Concrete mold
  • Small trowel, spatula, or a similar flat tool
  • Water
  • Lubricant to release concrete from the mold (e.g., silicone mold release, cooking spray, or motor oil)

plastic molds pouring concrete paths lie

Follow the process below to use your concrete mold:

  1. Select the mold you will use.
  2. Prepare the mold by applying a lubricant or mold release agent. The release agent makes it easier to remove the concrete and extends its useful life.
  3. Mix the concrete well with enough water to get the right consistency. Ensure that it is not too runny.
  4. Pour the concrete mix into the mold, then let it cure. The curing time depends on the type of project you are working on.
  5. Carefully remove the mold when the concrete has taken shape and is fully cured.
  6. Allow the concrete to dry completely.

Projects Using Concrete Moulds

Here are some home project ideas you can do using concrete molds:

  • Home accessories and decorations (e.g., house number)
  • Bookends
  • Candle holders
  • Drawer pulls
  • Flower vase base
  • Fridge magnets
  • Gadget stand
  • Planters

What Type Of Concrete Mould Is Best To Use?

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There are various molds you can use for your concrete projects. Please note that the concrete mold type will affect the quality of the finished product.

You can buy premade molds made of silicone, liquid rubber, or PVC pipe, or you can create your own mold if you want to customize the shape. Here are details about the various mold types:

  • Silicone - A durable mold that can last over a hundred castings. It is also easy to remove dried concrete with the proper technique. Moreover, this mold is common for creating sculptures.
  • Platinum-core silicone - This material can endure high temperatures, has low shrinkage, and is easy to release.
  • Liquid rubber - The mold will not shrink while the concrete is drying. Also, it has higher abrasion resistance. You can use this mold for small crafts or large architectural elements.
  • PVC pipe - This cheap material is usually used for concrete testing. The mold material can isolate oil and other particles in concrete. In effect, pouring on the mold is easier.
  • Polypropylene - This material is a thermoplastic common for molding applications. It is highly flexible, durable, and resistant to heat and moisture.

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You can use everyday items you find at home as your molds. These may include:

  • Beverage bottles
  • Buckets
  • Cups
  • Laminate cabinets
  • Milk cartons
  • Plastic containers

Just add the concrete mix, and it will follow the object's shape. You can also create a mold with wooden frames if you'd like to customize the shape.

For complicated projects, you should ask a concrete expert to help you select a suitable type of mold.

What Kind Of Concrete Mix To Use For Concrete Moulds?

There are various concrete options available on the market compatible with molds. You need to check the quality and cost of the concrete to get the intended results.

Consider the following when selecting the concrete mix:

  • Consistency (i.e., aggregate or sand-to-cement ratio)
  • Desired thickness
  • Low moisture content
  • Setting and drying time
  • Size and purpose of the project
  • Type of mold

Here are the kinds of concrete you can use for the molds:

  • Fast-setting
  • Fiber-reinforced
  • Quick-drying

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D-I-Y Concrete Mix

Making your own concrete mix saves you money. You will need the following materials:

  • Buckets
  • Cement
  • Coarse gravel or crushed stone
  • Sand
  • Water
  • Wheelbarrow

Once you have the materials, follow the steps below to create the concrete mix:

  1. Measure the needed materials. You need 3 buckets of sand, 2 for gravel, and 1 for cement. If you are doing a small batch, the ratio should be 3:2:1.
  2. Mix the dry ingredients thoroughly.
  3. Create a reservoir in the middle of the mixture. Add water until the mixture is all wet. The consistency should be like cookie dough. Add water as needed to get the desired consistency.

How Long Should You Leave Concrete In A Mould?

worker paving new parking places concrete

The amount of time depends on the project. It might take minutes, hours, days, or weeks before you remove the mold based on the concrete type and size of the project. Time is critical because you need to remove the concrete from the mold at the right time.

For small projects for home ornaments, you should leave the concrete in the mold for 15-20 minutes. A bigger project, such as a sink, will take 24 hours to cure.

For other projects like a concrete patio, you can remove the mold after the initial setting, before the concrete completely dries, so that you can use it again for the next patio block. Remember to smooth the edges when you remove the mold for a neat look.

Why Is Concrete Curing Time Important?

Curing achieves the following:

  • It helps retain moisture to allow the concrete to gain strength.
  • It delays shrinkage and resists cracking.
  • It improves durability.

It will take about 28 days for concrete to cure fully. The actual time taken can be more or fewer days, depending on the concrete's condition and environmental factors, such as the temperature of the area where you leave the concrete.

Heat can dry out the moisture in the concrete mixture. This decrease in moisture affects the strength of concrete after curing. You should maintain a temperature of around 50-70° F during the curing time.

How To Cure Concrete

There is a process to follow for curing concrete. You don't just wait for the concrete dry. Follow the methods below to cure concrete for satisfactory results:

  • Add water to replace the evaporated water on the surface.
  • Seal the concrete to stop the evaporation of water. You can use waterproof paper or a plastic film seal.
  • Use water-retaining materials, such as burlap, canvas, or sand, and keep the materials damp throughout the curing process.
  • Apply chemicals that will act as a membrane for the concrete.

In Closing

man pour cement mold make concrete

Concrete molds are easy to use for your home projects. Begin by selecting the most suitable mold and concrete mix type for your project. You can choose a mold from the numerous options available in the market or make your own.

Once you have the mold, prepare it by applying a lubricant to release the concrete easily. Preparing the concrete mix before you pour it on the mold is also critical. Then observe the proper curing time for the concrete.

If you know how to use concrete molds correctly, you can get quality results for your home projects.

Read related posts about concrete here:

How Thick Should A Concrete Shower Base Be?

Can You Pour Concrete Over Rocks?