About 50 billion tons of sand and gravel are extracted annually, most of which is used for construction activities. This is a problem for two reasons. First of all, it’s not sustainable. Secondly, if we continue to extract sand at this rate, it will end up causing irreversible damage to the environment.
And no, you can’t just use sand from the desert. Desert sands are typically rounded and smooth, which makes them less effective for construction purposes. For concrete, the rougher texture of river or beach sand is essential as it helps bind the materials together. Desert sand, with its finer and more uniform grains, lacks the necessary angularity to bond effectively with cement.
“The issue of sand comes as a surprise to many, but it shouldn’t. We cannot extract 50 billion tonnes per year of any material without leading to massive impacts on the planet and thus on people’s lives.” Pascal Peduzzi, a researcher at the United Nations Environment Programme (UNEP), told BBC.A 2024 study suggests China may have found a solution to the sand mining problem. The Chinese have been using artificial sand made by crushing rocks and leftover materials from mining for many of their construction projects. This simple technique has allowed them to drastically reduce their dependence on natural sand without slowing down their massive construction projects. [...]
The study authors developed a monitoring system that allowed them to examine the sand use pattern in China from 1995 to 2020. Their analysis revealed many surprising facts. For example, the Chinese have been producing artificial sand since the early 2000s, but it became popular in 2010.
2010 was also the year when the supply of natural sand in China reached its highest level. However, the next year’s supply of manufactured sand overtook that of natural sand, becoming the primary sand type used for construction activities.
In the following years, production of artificial sand continued to increase by 13 percent annually. In 2020, the use of natural sand reduced to the extent that it accounted for only 21 percent of the total sand supply, witnessing an 80 percent decline compared to 2010.
“China’s overall sand supply surged by approximately 400% over the study period, yet the proportion of natural sand dropped from ≈80% to ≈21% due to the increasing use of manufactured sand,” the study authors note.by Rupendra Brahambhatt, ZME Science | Read more:
“The percentage of manufactured sand in the Chinese market could now be close to 90 percent. The shift from natural sand to manufactured sand is a miracle for a country that has completed such massive infrastructure construction,” Song Shaomin, a professor at Beijing University of Civil Engineering and Architecture, told SCMP.
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