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The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
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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.
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Geographic Information System (GIS) technology is essential for risk identification, action prioritization, and resource optimization in critical situations like flooding and earthquakes. By integrating spatial and demographic data, GIS provides a comprehensive framework for emergency response.GIS integrates data layers, like rainfall intensity, topography, elevation profiles, and river levels, to model high-risk flood zones. These layers assess areas susceptible to flooding based on their...
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Design Example: Managing Concrete Workability01:14

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Sustainable Development01:43

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Updated: Nov 10, 2025

Mesocosm-Scale Constructed Wetland Design for Wastewater Treatment
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Can smart policies solve the sand mining problem?

Michael Hübler1,2, Frank Pothen1

  • 1Institute for Environmental Economics and World Trade, Leibniz University Hannover, Hannover, Germany.

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Global sand scarcity necessitates sustainable solutions. A coordinated sand export tax and a novel "Sand Extraction Allowances Trading Scheme" can effectively manage sand mining, balancing economic development for exporters and importers.

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Area of Science:

  • Environmental Economics
  • Resource Management
  • International Trade Policy

Background:

  • Sand is a critical resource for global construction and land reclamation.
  • Unsustainable sand extraction leads to significant ecological damage and social costs.
  • Addressing global sand scarcity requires effective policy interventions.

Purpose of the Study:

  • To analyze the sand trade between Southeast Asia and Singapore as a case study.
  • To identify policy solutions for sustainable sand resource management.
  • To balance economic growth with environmental protection in transboundary sand trade.

Main Methods:

  • Model-based analysis of international sand trade dynamics.
  • Economic impact assessment of proposed policy interventions.
  • Simulation of a coordinated transboundary sand output tax.

Main Results:

  • A coordinated transboundary sand output tax significantly reduces sand mining.
  • Economic costs for the sand importer are minimal.
  • Economic benefits for sand-exporting nations are slightly positive.

Conclusions:

  • Policy interventions are crucial for mitigating the negative impacts of sand extraction.
  • A coordinated sand export tax offers an effective solution for reducing sand mining.
  • A "Sand Extraction Allowances Trading Scheme" can sustainably balance economic and developmental needs.