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Related Concept Videos

Mortar Properties01:17

Mortar Properties

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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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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.
The balance of water to cement in the mix is...
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Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

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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.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
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Mortar Joint Deterioration in Masonry01:13

Mortar Joint Deterioration in Masonry

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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...
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Mortar01:29

Mortar

185
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...
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Microcracking in Concrete01:20

Microcracking in Concrete

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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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Advanced Pore Structure Characterization of High-Volume Mineral Admixture Steam-Cured Mortar Using X-Ray Computed

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Concrete Technology

Background:

  • Steam curing is common for precast concrete but causes thermal damage, reducing durability and strength.
  • Supplementary cementitious materials (SCMs) can improve concrete's pore structure and mitigate steam curing's negative effects.

Purpose of the Study:

  • To investigate the impact of steam curing temperatures and subsequent curing methods on the pore characteristics of SCM-rich mortars.
  • To assess the influence of curing regimes on the mechanical properties and durability of steam-cured concrete.

Main Methods:

  • High-resolution X-ray computed tomography (X-CT) was used to analyze pore structure.
  • Mortar specimens with high SCM content were subjected to various steam curing temperatures and post-curing regimes.
  • Compressive and flexural strengths were measured to evaluate mechanical performance.

Main Results:

  • Higher steam curing temperatures increased porosity and decreased mechanical strength.
  • Water curing after steam curing (ST8012-WA) enhanced compressive strength by 9% and flexural strength by 19.8% compared to natural curing (ST8012-NA).
  • Standard-cured specimens (SD) showed the highest compressive strength, indicating detrimental effects of elevated steam curing.

Conclusions:

  • Elevated steam curing temperatures negatively affect concrete's mechanical properties and durability.
  • Post-curing techniques, particularly water curing, are crucial for mitigating thermal damage and improving concrete quality.
  • Optimized curing strategies can enhance the longevity and performance of steam-cured precast concrete components.