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Related Concept Videos

Masonry Paving01:21

Masonry Paving

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The construction of masonry paving involves using materials such as bricks, stones, and concrete masonry units. These materials are chosen for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be installed dry on a thin layer of sand and a gravel base, or they can be embedded in mortar or asphalt on a concrete slab. For areas subjected to heavy vehicular loads, a rigid base layer of reinforced or unreinforced concrete is recommended. In contrast,...
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Porosity and Absorption of Aggregate01:20

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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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Permeability of Concrete01:25

Permeability of Concrete

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Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
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Key Elements for Plant Nutrition02:35

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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Design Example: Joints in Concrete Pavements01:28

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Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
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Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

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The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
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Design and Construction of an Urban Runoff Research Facility
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Nutrient infiltrate concentrations from three permeable pavement types.

Robert A Brown1, Michael Borst2

  • 1Oak Ridge Institute for Science and Education Postdoctoral Fellow at U.S. Environmental Protection Agency, 2890 Woodbridge Ave., MS-104, Edison, NJ, 08837, USA.

Journal of Environmental Management
|September 9, 2015
PubMed
Summary
This summary is machine-generated.

Porous asphalt released more nitrogen than other permeable pavements, while also reducing orthophosphate. Permeable interlocking concrete pavement and pervious concrete exported orthophosphate, unlike porous asphalt.

Keywords:
NitrogenOrthophosphatePermeable interlocking concrete pavementPermeable pavementPervious concretePorous asphalt

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Area of Science:

  • Environmental Engineering
  • Water Quality Management
  • Sustainable Pavement Systems

Background:

  • Permeable pavements are increasingly adopted for stormwater management.
  • Limited field data exists comparing nutrient impacts of different permeable pavement types.

Purpose of the Study:

  • To compare nutrient concentrations in stormwater runoff from three permeable pavement types: porous asphalt (PA), pervious concrete (PC), and permeable interlocking concrete pavement (PICP).
  • To assess the influence of pavement type on nitrogen species, orthophosphate, and organic carbon in stormwater infiltrate.

Main Methods:

  • A U.S. EPA research parking lot with PICP, PC, and PA sections was monitored over 12 months.
  • Stormwater samples from 13 rainfall events were collected and analyzed for key nutrients.
  • Infiltrate concentrations were compared to rainwater and impervious asphalt runoff controls.

Main Results:

  • Porous asphalt (PA) infiltrate showed significantly higher total nitrogen (TN) concentrations than other permeable pavements and controls.
  • PA infiltrate also had higher nitrite and ammonia, linked to high pH, and lower orthophosphate due to precipitation.
  • Permeable interlocking concrete pavement (PICP) and pervious concrete (PC) showed higher orthophosphate in infiltrate than influent sources.

Conclusions:

  • Porous asphalt may act as a nitrogen source in stormwater runoff, contrary to expectations.
  • High pH in PA systems influences nitrogen speciation and enhances orthophosphate removal.
  • PICP and PC systems can export orthophosphate, requiring further management considerations.