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Related Concept Videos

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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Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

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Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
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Types of Cement I01:21

Types of Cement I

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Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
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Porosity in Cement Paste01:18

Porosity in Cement Paste

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
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Curing of Concrete01:20

Curing of Concrete

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The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
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Related Experiment Video

Updated: Aug 28, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

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A novel resin cement to improve bonding interface durability.

Xi He1, Shiyang Yu1, Huimin Wang1

  • 1Department of Prosthetic Dentistry, Hospital of Stomatology, Jilin University Changchun 130021 P. R. China zhusong1965@163.com.

RSC Advances
|September 21, 2022
PubMed
Summary

This study introduces a new polyurethane (PU) dental cement that enhances bonding strength and resistance to degradation. The improved cement reduces microleakage, increasing the success rate of dental restorations.

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science

Background:

  • Bonding failure is a primary cause of dental restoration failure.
  • Factors like bond strength, aging, and polymerization shrinkage compromise interface stability and lead to microleakage.

Purpose of the Study:

  • To develop a novel polyurethane (PU) cement to improve dental restoration longevity.
  • Enhance mechanical properties, hydrophobicity, degree of conversion (DC), and aging resistance while reducing polymerization shrinkage.

Main Methods:

  • Synthesized a novel PU cement incorporating isophorone diisocyanate (IPDI) and hydroxyethyl methacrylate (HEMA).
  • Adjusted the polyester:polyether ratio to optimize cross-linking.
  • Evaluated mechanical properties, thermal stability, DC, polymerization shrinkage, bond strength, and aging resistance.

Main Results:

  • The novel PU cement demonstrated improved mechanical properties and thermal stability.
  • Reduced polymerization shrinkage and enhanced bond strength and DC.
  • Exhibited hydrophobic properties and superior aging resistance in a simulated salivary environment.

Conclusions:

  • The developed PU cement offers improved performance and durability for dental restorations.
  • This innovation provides a promising strategy to minimize microleakage and enhance restoration success rates.