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Related Concept Videos

Mortar Properties01:17

Mortar Properties

198
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...
198
Mortar01:29

Mortar

334
Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
334
Porosity in Cement Paste01:18

Porosity in Cement Paste

245
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.
The balance of water to cement in the mix is...
245
Mortar Joint Deterioration in Masonry01:13

Mortar Joint Deterioration in Masonry

172
Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
The...
172
Strength of Cement01:20

Strength of Cement

226
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...
226
Soundness of Cement01:17

Soundness of Cement

262
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
262

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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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Fundamental Properties and Self-Healing Performance of Repair Mortar with Solid Capsules Made Using Inorganic

Sung-Rok Oh1, Kwang-Myong Lee2, Sung Choi3

  • 1R&D Team, Newjust Co., Ltd., Gwangmyeong 14348, Korea.

Materials (Basel, Switzerland)
|March 10, 2022
PubMed
Summary

This study developed encapsulated inorganic powders for self-healing cement repair mortar. Encapsulation improved healing performance by 20% for cracks up to 0.25 mm, overcoming limitations of traditional reactive powders.

Keywords:
healing performanceinorganic reactive powderrepair mortarself-healingsolid capsules

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Concrete Technology

Background:

  • Traditional inorganic powder-based self-healing materials degrade over time due to rapid reactions.
  • Microcapsule and bacteria pellet methods exist, but inorganic powders offer a distinct approach.
  • Controlling the reaction rate of inorganic healing agents is crucial for sustained performance.

Purpose of the Study:

  • To enhance the durability and performance of self-healing cementitious materials.
  • To investigate the effectiveness of encapsulating inorganic reactive powders in solid capsules (SC).
  • To evaluate the impact of SC on the mechanical properties and self-healing capabilities of repair mortar.

Main Methods:

  • Inorganic reactive powders were encapsulated in solid capsules (SC) with a moisture-impermeable membrane.
  • SC were incorporated into repair mortar at varying percentages (0%, 5%, 10%) by binder mass.
  • Fundamental properties (rheology, flow, strength, length change) and self-healing performance were assessed.
  • Healing efficiency was measured for specific crack widths (0.25 mm) and crack-inducing ages (28 days).

Main Results:

  • A slight decrease in rheological and mechanical properties was observed with increasing SC content.
  • Repair mortar with SC demonstrated significantly improved self-healing performance compared to plain mortar.
  • A minimum 20% enhancement in healing was achieved for 0.25 mm cracks induced at 28 days, after 28 days of healing.

Conclusions:

  • Solid capsule encapsulation effectively delays the reaction of inorganic powders, enhancing self-healing longevity.
  • The developed self-healing repair mortar shows promise for extending the service life of concrete structures.
  • This encapsulation technique offers a viable strategy to improve the performance of inorganic self-healing agents in cement composites.