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Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
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Accelerators

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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
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Impact Strength of Concrete01:21

Impact Strength of Concrete

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Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Push-out bond strength of CPP-ACP-modified calcium silicate-based cements.

Alaa E Dawood1, David J Manton, Peter Parashos

  • 1Melbourne Dental School, Oral Health CRC, The University of Melbourne.

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|August 4, 2015
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Adding casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) to calcium silicate-based cements (CSCs) significantly improved their push-out bond strength. Biodentine showed superior bond strength compared to other tested cements.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Calcium Silicate Cements

Background:

  • Calcium silicate-based cements (CSCs) are widely used in endodontic and restorative dentistry.
  • Improving the bond strength of CSCs is crucial for long-term clinical success.
  • Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) is known for its potential to enhance remineralization and material properties.

Purpose of the Study:

  • To evaluate the effect of varying concentrations of CPP-ACP on the push-out bond strength of CSCs.
  • To compare the bond strength of CPP-ACP modified CSCs with a trial MTA and other commercial CSCs (Biodentine and Angelus MTA).

Main Methods:

  • Three hundred root sections were prepared and filled with either modified CSCs (0-3.0% CPP-ACP) or control cements (trial MTA, Biodentine, Angelus MTA).
  • Push-out bond strength was measured after 2 months of incubation in a phosphate buffer solution.
  • Data were analyzed using one-way ANOVA and Tukey's test.

Main Results:

  • The addition of CPP-ACP significantly increased the push-out bond strength of the tested CSCs (p<0.05).
  • Biodentine exhibited significantly higher push-out bond strength compared to all other tested cements (p<0.05).
  • No significant difference in bond strength was observed between Angelus MTA and the trial MTA across most CPP-ACP concentrations.

Conclusions:

  • CPP-ACP incorporation is an effective strategy to enhance the push-out bond strength of calcium silicate-based cements.
  • Biodentine demonstrates superior bond strength among the evaluated materials.
  • Further research may explore the clinical implications of CPP-ACP modified CSCs for improved adhesion in root canal treatments.