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Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

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Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
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Types of Cement I01:21

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Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
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Masonry Paving01:21

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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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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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Types of Cement II01:22

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Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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A Multifunctional Cementitious Composite for Pavement Subgrade.

Mohammad Jawed Roshan1, Mohammadmahdi Abedi1, António Gomes Correia1

  • 1Department of Civil Engineering, ISISE, ARISE, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.

Materials (Basel, Switzerland)
|April 9, 2024
PubMed
Summary
This summary is machine-generated.

This study developed a self-sensing cementitious composite for intelligent subgrade layers. The composite effectively monitors stress, strain, and damage, enhancing transportation infrastructure health.

Keywords:
MWCNT/GNPdamage detectionelectrochemical impedance spectroscopy (EIS)resilient modulusself-sensing cementitious compositestress/strain-sensing

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Smart Structures

Background:

  • Premature failure and degradation of transportation infrastructure layers pose significant challenges.
  • Structural Health Monitoring (SHM) is crucial for pavement construction layers to address these issues.

Purpose of the Study:

  • To investigate the stress/strain sensing and damage detection capabilities of a novel self-sensing cementitious composite.
  • To evaluate the composite's potential for use in intelligent subgrade layers.

Main Methods:

  • Fabrication of a self-sensing cementitious composite using cement, multiwalled carbon nanotubes (MWCNTs), and graphene nanoplatelets (GNPs).
  • Piezoresistive analysis to assess stress/strain-sensing performance.
  • Electrochemical Impedance Spectroscopy (EIS) for damage detection.
  • Scanning Electron Microscopy (SEM) for microstructural analysis.

Main Results:

  • Electrical resistivity is sensitive to MWCNT/GNP concentration, with >0.5% required for responsiveness.
  • Increased MWCNT/GNP concentration and stress levels enhance stress/strain-sensing performance.
  • Fractional Changes in Resistivity (FCR) correlate with resilient modulus, indicating stiffness changes.
  • EIS analysis shows distinct changes in Nyquist plots before and after material failure.
  • SEM images reveal MWCNT bridging and GNP filling effects within the composite.

Conclusions:

  • The developed self-sensing cementitious composite demonstrates promising capabilities for SHM in pavement construction.
  • The composite's piezoresistive and electrochemical properties can effectively monitor structural integrity and damage.
  • This intelligent subgrade material offers a pathway to improved durability and reduced maintenance costs for transportation infrastructure.