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Plasticizers

Plasticizers

Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...

Superplasticizers

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...

Preplaced Aggregate Concrete

Preplaced Aggregate Concrete

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...

Plastic Deformations

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...

Shrinkage in Concrete

Shrinkage in Concrete

Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...

Plastic Deformations of Members with a Single Plane of Symmetry

Plastic Deformations of Members with a Single Plane of Symmetry

When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...

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Related Experiment Video

Updated: Jun 5, 2025

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Published on: November 20, 2014

Elasto-plastic solution for undrained cylindrical cavity expansion in refuse soil.

Weimin Zhang¹, Fengwei Guo², Yun Zhao³

¹Jinhua University of Vocational Technology, Jinhua, 321007, China.

Scientific Reports

|December 3, 2024

Summary

This study proposes an elasto-plastic model for undrained cylindrical cavity expansion in fiber-reinforced refuse soil. Results show unique soil behavior, differing significantly from ordinary soils, especially with fiber reinforcement.

Keywords:

Computational geotechnics Cylindrical cavity expansion Elasto-plastic solution Fiber content Landfills

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Last Updated: Jun 5, 2025

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

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Published on: November 20, 2014

A Bending Test for Determining the Atterberg Plastic Limit in Soils

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Area of Science:

Geotechnical Engineering
Soil Mechanics
Constitutive Modeling

Background:

Infrastructure projects increasingly face challenges on landfill sites.
Existing models may not fully capture the behavior of refuse soil.

Purpose of the Study:

To develop an elasto-plastic theoretical solution for undrained cylindrical cavity expansion in refuse soil.
To incorporate the reinforcement effect of fibers and large deformation theory.
To analyze the unique mechanical response of refuse soil.

Main Methods:

An elasto-plastic constitutive model for refuse soil considering fiber reinforcement.
Application of large deformation theory.
Validation against existing solutions (e.g., modified Cam-clay model).

Main Results:

Refuse soil exhibits distinct columnar pore expansion behavior compared to ordinary soil.
Only slurry-like components reach the critical state near the pore.
Fiber reinforcement significantly influences the elastic and plastic stages before reaching the critical state line.

Conclusions:

The proposed model accurately captures the complex behavior of refuse soil.
Fiber reinforcement plays a crucial role in the mechanical response of refuse soil.
Special attention is needed for the unique behavior of refuse soil in geotechnical engineering applications on landfills.