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The quality and density of the foam need to be precise to achieve stable foam. Be aware of wet and curing concrete as well as tools, buckets and run off around pets. It’s abrasive and can cause redness, swelling and itching. (6) Safety glasses, gloves and dust mask Generally, cement dust particles are in the 10-micron range, which are captured by the inexpensive masks. (see link “ Building The Best Foam Generator” or “ Buying The Best Aircrete Foam Generator“) These can be homemade or they can be purchased.
#Foam concrete mix design calculator generator#
Metal screen added to mixing paddle to increase foam thickness.Ī foam generator is a device that combines compressed air with a liquid foaming agent to produce a foam. However, if tackling large or varied aircrete project it’s highly recommend to purchase or make a foam generator. This is a low cost technique for those testing or experimenting with aircrete who don’t want to incur the added expense of purchasing a foam generator or air compressor. A cement mixing paddle can be attached to a drill to accomplish both tasks.įor small projects, some have had success creating suitable stable foam by adding a metal screen to their cement mixing paddle and mixing the proportioned soap and water solution together in a small bucket.
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These are designed for regular repeated use.Ī good quality concrete mixer is needed to mix your cement and water as well as incorporate your foam into your slurry. It’s recommended to use a heavy duty commercial grade drill for mixing of cement. If the foam stays firm with little or no collapsing, this is a good indicator that the foam is stable enough to stay firm for the duration required for the concrete to cure.Įlectric mixer or drill with concrete mixing paddleĪt least 8 amp drill.
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Fill a large bucket with the foam and allow it to sit for several hours. When applying a large dollop of foam to the palm of the hand and turning the palm downward the foam should cling and remain on the hand. The foam should be the consistency of thick shaving cream. If the foam is heavier then increase the air pressure or if the foam is lighter decrease air pressure.Īnother, less precise, methods for testing the stability of the foam is to visually inspect the resulting foam. The weight of the foam should weight between 90-100 grams or approximately 3 ounces per quart. Fill the 1 quart container to top with foam and level the top by scrap off any excess. Place a 1 quart container onto the scale and tare/zero it out. The proper weight of the foam is crucial to achieving stable foam. The process for making aircrete yourself requires only basic skills and basic tools.īelow will be the open source recipe for making lightweight bricks or blocks suitable for a dome structure.Ĭategories 1. There are many different mix design recipes depending on the application. As the concrete hardens, the bubbles disintegrate leaving air voids of similar sizes to create a lightweight concrete.Īircrete is very versatile and can be modified and adjusted for project size and need. This distributes a multitude of discrete air cells uniformly throughout the mixture.
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The cement and water slurry are combined with a pre-formed foam (surfactant). The basic recipe for aircrete consists of cement, water and foam.