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Related Concept Videos

Mortar01:29

Mortar

464
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...
464
Concrete01:20

Concrete

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Concrete is a vital construction material extensively used worldwide, primarily valued for its strength, durability, and versatility, which it provides for various structural designs. Concrete generally comprises ingredients like Portland cement, coarse gravel, fine sand, and water. Concrete can be mixed by simple hand methods or industrially at computer-controlled plants. The mixture consists of aggregates and a paste made from water and Portland cement. This paste coats the aggregates and,...
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Laying Concrete Masonry01:16

Laying Concrete Masonry

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Constructing a concrete masonry wall involves a series of steps designed to ensure durability, stability, and alignment. The construction starts with preparing the base, which includes cleaning the area where the wall will be erected. The next step involves spreading mortar where the first row of concrete blocks will be laid, typically starting at a corner section to help define the wall's boundaries.
Mortar application focuses on the face shells of the blocks, the sides that face outward,...
292
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...
278
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

379
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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Mortar Properties01:17

Mortar Properties

340
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...
340

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Concrete-Based and Mixed Waste Aggregates in Rendering Mortars.

Samuel Roque1, Cinthia Maia Pederneiras1,2, Catarina Brazão Farinha1,2

  • 1Civil Engineering Research and Innovation for Sustainability (CERIS), Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1-1049-001 Lisbon, Portugal.

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Summary

This study explores using construction and demolition waste (CDW) in rendering mortars. Mortars with 20% mixed recycled aggregate (MRA) showed the best mechanical performance, creating lighter, crack-resistant materials.

Keywords:
CDWCO2 reductioneco-mortarsrecyclerendering mortarsreuse

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Sustainable Construction

Background:

  • Construction and demolition waste (CDW) presents a significant disposal challenge.
  • Recycling CDW into construction materials offers environmental and economic benefits.
  • Rendering mortars require specific performance characteristics for durability and application.

Purpose of the Study:

  • To investigate the incorporation of recycled concrete aggregate (RCA) and mixed recycled aggregate (MRA) into rendering mortars.
  • To evaluate the impact of varying percentages (0-100% by volume) of these recycled aggregates on mortar performance.
  • To determine the optimal aggregate type and percentage for enhanced mortar properties.

Main Methods:

  • Preparation of rendering mortars with different volume fractions of RCA and MRA.
  • Comprehensive experimental testing including workability, mechanical strength, water absorption, and shrinkage.
  • Assessment of open porosity and durability via water permeability after accelerated ageing.

Main Results:

  • Increased incorporation of MRA and RCA led to decreased mechanical strength, modulus of elasticity, and bulk density.
  • These reductions resulted in lighter mortars with reduced susceptibility to cracking.
  • Mortars modified with 20% MRA exhibited the most favorable mechanical behavior.

Conclusions:

  • Recycled aggregates (MRA and RCA) can be successfully incorporated into rendering mortars.
  • Optimized use of recycled aggregates can produce lighter, more durable mortars.
  • A 20% MRA content appears optimal for achieving desirable mechanical properties in rendering applications.