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Related Concept Videos

Mortar Properties01:17

Mortar Properties

549
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...
549
Mortar01:29

Mortar

688
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...
688
Strength of Cement01:20

Strength of Cement

712
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...
712
Mortar Joints in Brick Masonry01:25

Mortar Joints in Brick Masonry

498
Mortar joints play a critical role in brick masonry, filling the spaces between brick to bind them together and provide structural integrity and strength. The thickness of these joints is variable, typically ranging from less than one-fourth inch to over half an inch, based on structural needs and specific applications.
The process of joint tooling is implemented as the mortar begins to harden. This technique involves compacting and shaping the mortar to enhance both the appearance and the...
498
Mortar Joint Deterioration in Masonry01:13

Mortar Joint Deterioration in Masonry

392
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...
392
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

548
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...
548

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Optimization and Performance Evaluation of Multi-Component Binder-Based Mortars Using Particle Packing Techniques.

Vanga Renuka1, Sarella Venkateswara Rao1, Tezeswi Tadepalli1

  • 1Department of Civil Engineering, National Institute of Technology Warangal, Warangal 506004, Telangana, India.

Materials (Basel, Switzerland)
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Summary

This study optimizes multi-component binders (MCB) and aggregate gradation for stronger, more durable cementitious systems. Optimized mixes reduce energy and CO2 emissions, enhancing sustainability in construction materials.

Keywords:
D-optimal mixture designdrying shrinkageeco-efficient mortarmulti-component binderpacking densitysupplementary cementitious materials

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Sustainable Construction

Background:

  • Multi-component binders (MCB), combining Ordinary Portland Cement (OPC) with supplementary cementitious materials (SCMs), are crucial for sustainable and high-performance cementitious systems.
  • SCMs like fly ash, slag, metakaolin, and silica fume offer particle size benefits from micron to sub-micron scales.

Purpose of the Study:

  • To integrate advanced mixture design and particle packing techniques for optimizing both MCB composition and aggregate gradation.
  • To enhance packing density, mechanical strength, durability, and reduce environmental impact in cementitious materials.

Main Methods:

  • Utilized D-optimal mixture design (DOD) to correlate binder composition with wet packing density (WPM).
  • Employed the Modified Toufar Model (MTM) to optimize fine aggregate gradation for maximum packing density.
  • Evaluated optimized mortar mixes for mechanical strength, pozzolanic reactivity, capillary water sorptivity, and drying shrinkage.

Main Results:

  • Optimized MCB and aggregate gradation significantly improved packing density and pozzolanic activity.
  • Enhanced strength and durability performance were observed in the optimized mortar mixes.
  • CFGMS-based systems demonstrated substantial energy (35-40%) and CO2 emission (34-48%) reductions compared to C100.

Conclusions:

  • Integrated optimization of binder composition and aggregate gradation is effective for improving cementitious system performance.
  • The use of SCMs in MCB is a viable strategy for enhancing material properties and achieving significant environmental benefits.
  • Optimized systems offer a sustainable alternative to conventional cement, reducing energy consumption and carbon footprint.