3D printed durable concrete with glass instead of sand

Researchers from Singapore Technological University Nanyang have studied whether it is possible to make concrete and

After all, glass is made of silica, and this is the main componentSand.

During the work, the scientists crushed glass waste intoin the form of five different sizes - large, medium, small, ultra-fine and moon dust. This is to replace sand and gravel, typical concrete aggregates. The crushed glass was then mixed with cement and water.

Once the concrete hardened, it turned out that itstrength is similar to traditional concrete with sand. In addition, the researchers noted that the poured concrete did not deform or collapse before it completely solidified. Plus it was liquid enough to pass through the printer's nozzle easily.

The authors also noticed that such a mixture required less water, since the glass does not absorb as much liquid.

As a result, the team stated that the redesignedglass can be used to replace up to 100% of the sand in 3D printing concrete. Today sand is actively used, and it does not have time to recover naturally. Therefore, according to the authors, the prospect of using recycled glass in construction is becoming increasingly attractive.

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