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Slump Test

Slump Test

The slump test is a widely used method to measure the workability of concrete. It employs a 12-inch high truncated cone mold that tapers from eight inches at the base to four inches at the top. Before testing, the mold is securely attached to a flat base and dampened.
Concrete is poured into the mold in three layers to conduct the test. Each layer is compacted 25 times with a steel tamping rod, which has a five-eighths-inch diameter and a rounded end, to ensure even distribution and eliminate...

Design Example: Managing Concrete Workability

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
To address...

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...

Porosity in Cement Paste

Porosity in Cement Paste

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 critical—it...

Placing Concrete

Placing Concrete

The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...

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 30, 2026

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Published on: July 21, 2014

Slumping during sculpturing of composite materials.

Yu-Chih Chiang¹, Alena Knezevic, Karl-Heinz Kunzelmann

¹School of Dentistry and Graduate Institute of Clinical Dentistry, College of Medicine, National Taiwan University and National Taiwan University Hospital, Taipei, Taiwan.

Dental Materials : Official Publication of the Academy of Dental Materials

|September 30, 2008

Summary

Composite material slumping varies significantly with time and mold shape. ELS and Clearfil Majesty showed the highest deformation, while Miris 2 Dentin and Synergy D6 Enamel exhibited minimal slumping, aiding material selection for dental procedures.

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Published on: May 17, 2018

Area of Science:

Dental Materials Science
Biomaterials Engineering
Polymer Science

Background:

Understanding the handling characteristics of dental composite materials is crucial for successful clinical application.
Slumping, or shape deformation, can affect the accuracy and fit of restorations.
Quantifying slumping is essential for material development and selection.

Purpose of the Study:

To investigate and quantify the slumping characteristics of four different composite materials.
To assess the influence of time and mold geometry on composite material deformation.
To establish a reproducible method for evaluating composite handling properties.

Main Methods:

Four composite materials were sculpted into tooth-shaped molds (molar occlusal surfaces).
Surface topography was captured using laser scanning (25 microm lateral resolution).
3D datasets were analyzed to calculate deformation relative to baseline measurements over time.

Main Results:

Surface deformation increased with observation time for all composites.
ELS and Clearfil Majesty exhibited significantly higher slumping compared to Miris 2 Dentin and Synergy D6 Enamel.
Deformation varied with mold geometry, with "mould 3" < "mould 2" < "mould 1" for all materials.
Time, mold type, and composite material significantly influenced deformation (p<0.05).

Conclusions:

The developed laser scanning method reliably quantifies composite slumping.
Significant differences in handling characteristics were identified among the tested composite materials.
This assessment aids in determining material suitability for specific clinical indications.