Workshop "Technology of producing artificial sand to replace natural sand"

Workshop content

In the context of increasingly depleted and scarce natural sand resources. In April 2024, Nguyen Vinh Company cooperated with Terex Group to organize a workshop on "Technology for producing artificial sand to replace natural sand". To introduce the world's leading modern and advanced technologies in the production (crushing and washing) of artificial sand to replace natural sand.

In recent years, natural sand resources are increasingly depleted not only in Vietnam but also globally. Many research groups and experts have continuously come up with initiatives. Using other materials to replace natural sand. This has been done by Western countries since the 80s of the last century. Projects in Europe (Construction of the French Alps Dam - 1980, in France, or Ataturk Turkey - 1986 in Türkiye) have made artificial sand in the early stages by combining cone - ball milling.

Current situation in Vietnam

In Vietnam, the current supply of natural sand only meets about 40% of demand. Therefore, in the orientation of developing construction materials since the early years of the 21st century. The Government has taken positive actions to prohibit the indiscriminate exploitation of natural sand. Encourage scientists and researchers to develop new materials. Replace natural sand, ensure construction quality, and bring sustainability.

Specifically, on August 29, 2008, the Prime Minister signed Decision No. 121/2008/QD-TTg approving the master plan for the development of construction materials in Vietnam until 2020. [...] In order to take advantage of raw materials, reduce environmental pollution, and increase the source of unburnt construction materials in the locality. Encourage investment in the construction of crushed sand production facilities to achieve a total designed capacity of about 10 million m3 by 2020.³/year.

Dr. Nguyen Quang Cung (former Director of the Department of Construction Materials, Ministry of Construction, currently Chairman of the Vietnam Cement Association) is the person in charge of the artificial sand project, having traveled to Europe (France, Ireland, Portugal) to survey and develop Vietnamese artificial sand standards.

What does Nguyen Vinh say about "Artificial Sand"?

Presenting at the workshop, the representative of Nguyen Vinh Company said. Developing the production of artificial sand with advanced technology for high-grade concrete (with classification of coarse and fine modulus sand). With the quality standards of additives required to meet international standards. Artificial sand will remove clay minerals and many other impurities. Avoid harming concrete, while collecting and processing (filtering, washing, separating ...). From quarries, river gravel, construction waste, industrial waste, and accompanying minerals.

Artificial sand from the above sources will be much more effective. Compared to river sand mining. Artificial sand has angular structure, round grains, blocks, continuous level, fine modulus increases the workability, adhesion and durability of concrete. The ratio of % with grain size in the range of 150 - 600 microns is high. Limiting the amount of fine particles (<75 microns) below 9% creates clean sand. Increases the compressive strength of concrete. The appropriate porosity of artificial sand (low) leads to less water and cement consumption.

Currently, most of the stone construction material production facilities in Vietnam are using old Chinese technology or using old machines. The investment cost is low but the production cost is high. This makes the product price high and especially does not meet the quality standards of roundness. The high flatness ratio of % makes the stone strength not ensure the quality of the project. Especially large projects with foreign elements.

Technology and solutions

According to the representative of Nguyen Vinh Company. The most modern artificial sand production technology (crushing and washing) today. Nguyen Vinh and Terex supply will ensure that the continuous grain band gradation can be adjusted to produce high-quality sand products with a high level of uniformity. Round, angular shape. Reduced voids, thereby reducing shrinkage and water content of concrete. Increase pumpability and workability. As well as adhesion, durability (compression resistance, bending), and bearing capacity of concrete, producing high-quality concrete. Meets international standards such as: ASTM C-33 (USA); JS A 5004 (Japan) BS 882 (UK). National standard TCVN 9205:2012 on crushed sand for concrete and mortar.

Nguyen Vinh and Terex companies also offer a comprehensive solution for green technology in the production of artificial sand. Helping businesses apply modern technology to achieve high economic efficiency. Reducing energy consumption, mineral resources and environmental protection measures. Water circulation (reuse on 90%). Along with that are technological solutions for Sulfur (SO2) - FGD. From fossil fuel burning plants to avoid Acid rain. Recovering CO2 to produce light powder to reduce the amount of CO2 in the air.

• Source : MOC.GOV.VN