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Related Concept Videos

Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

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Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
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High-Strength Erosion-Resistant Hydrogel Sand-Fixing Agent.

Zhiwei Xu1, Zhimin Gou1, Zhihao Chen1

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This study introduces a novel hydrogel sand-fixing agent that creates strong, durable sand columns. This eco-friendly material offers a sustainable solution for desert infrastructure and ecological engineering.

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Geotechnical Engineering

Background:

  • Traditional hydrogels face limitations in flexibility and structural stability.
  • These limitations hinder performance in harsh desert conditions like high temperatures and salt-alkali erosion.
  • Existing solutions fail to meet long-term durability requirements for desert infrastructure.

Purpose of the Study:

  • To develop a high-strength, erosion-resistant hydrogel sand-fixing agent.
  • To enable efficient and sustainable cement-free aeolian sand fixation.
  • To create a material stable in dry environments and under multiple stressors.

Main Methods:

  • Incorporation of methyl groups to enhance molecular chain rigidity.
  • Testing of sand columns' compressive strength and stability under various conditions.
  • Evaluation of strength recovery after exposure to acid/alkali environments and drying.

Main Results:

  • Sand columns achieved ultrahigh compressive strength (up to 54.3 MPa), exceeding commercial C30 concrete.
  • High stability was maintained under extreme conditions, including acid/alkali environments and drying.
  • Strength recovery to over 50 MPa was observed after environmental stressors.

Conclusions:

  • The developed hydrogel is a low-carbon engineering material suitable for desert environments.
  • It offers an innovative solution for desert resource utilization and ecological engineering.
  • The material demonstrates broad application prospects for sand fixation and infrastructure.