What Is Slump In Civil Engineering
The slump of fresh concrete-mix is influenced by the water-cement ratio, which is the ratio of mass of water to the mass of cement. The water-cement ratio is commonly written as "W/C" and has a typical value of 0.40 to 0.60. Workability and slump of concrete increase as the water-cement ratio increases.
The slump of fresh concrete mix is affected by the water-cement ratio. This ratio refers to the mass of water to the mass of cement and is denoted as W/C. The ideal range for W/C is between 0.40 and 0.60, with workability and slump increasing as W/C increases.
What is concrete slump test?
The concrete slump test is a crucial in situ test used to assess the consistency and workability of fresh concrete. It is a commonly used method in construction projects to ensure immediate concrete quality.
What is collapse slump in concrete?
Collapse slump is a type of slump in concrete that indicates the mix is too wet, with a high water-cement ratio and high workability. It is often seen in self-compacting concrete, which can have a slump value of over 650mm. Slump is a measure of the workability of concrete and is affected by several factors.
What are the three types of slumps?
The three types of slumps that may occur in a slump test are true slump, shear slump, and collapse slump. True slump involves a general drop of the concrete mass evenly, without disintegration. Shear slump indicates a lack of cohesion in the concrete, while collapse slump implies a complete collapse and loss of shape.
What is a zero slump in concrete?
Zero slump in concrete is a condition where the concrete maintains the shape of the mould, representing a stiff and consistent mix with very little workability. It is essential to repeat the test if any other types of slumps appear, as the true slump is the only reliable condition to assess the workability of the concrete.
The collapse slump of concrete indicates that its mix is too wet and considered harsh and lean. This information is from the book "A Self Learning Manual - Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method)" by Vincen.
What are the different types of slumped concrete?
Slumped concrete takes on various shapes, including true slump, shear slump, and collapse slump.
What is the difference between collapse slump and slump test?
A collapse slump in the concrete indicates that the mix is too wet or not suitable for a slump test. On the other hand, a slump test measures the workability of the mix and is only useful if it shows a true slump.
What does it mean when a shear or collapse slump is achieved?
If a shear or collapse slump occurs during a concrete slump test, it means that the mix is either too wet or too workable, and a fresh sample must be taken and tested again. Only a true slump test result is useful for assessing the workability of the mix.
The slump of fresh concrete mix is influenced by the water-cement ratio, represented as W/C, which is the ratio of water mass to cement mass. A typical range of W/C is between 0.40 to 0.60. Workability and slump of concrete are directly related to the W/C ratio.
What is slumped concrete?
Slumped concrete refers to the deformation of freshly mixed concrete under the influence of its own weight. The shape of slumped concrete may indicate the quality and consistency of the mixture. The slump test is a widely used method to determine the workability of concrete.
What are the factors that impact the slump of the concrete?
The factors that affect the slump of concrete include the water-cement ratio, which increases the slump as the amount of water increases. This is due to a decrease in friction between aggregates.
What is the property of fresh concrete-mix?
The property of fresh concrete-mix is called slump, which is dependent on the water-cement ratio. The ratio of water to cement is known as the water-cement ratio, abbreviated as W/C. Workability and slump of concrete is directly related to the water-cement ratio, which typically ranges from 0.40 to 0.60.
What is the difference between workability and slump of concrete?
Workability and slump of concrete are directly related to the water-cement ratio. Lower water-cement ratio means less water and more cement resulting in zero or true slump while a higher value of water-cement ratio results in more workability. Slump is the measure of consistency of concrete and workability refers to how easy the concrete can be placed, compacted, and finished.
According to the ACI 116R-00, no-slump concrete refers to freshly mixed concrete with a slump value of less than 25 mm. The constituents of this type of concrete are similar to conventional concrete, but with a higher proportion of aggregate.
What is zero slump concrete?
Zero-slump concrete is stiff and dry concrete that does not show any measurable slump after the removal of the slump cone, while negative-slump concrete maintains its stiffness even after additional water is added.
How is the slump of concrete determined?
The slump of concrete is determined by filling a cone-shaped mold with fresh concrete and measuring the subsidence after the mold is removed, in accordance with standard test methods.
What is the difference between true slump and collapse slump?
The concrete slump test can determine if the concrete is a true slump, shear slump, or collapse slump. A collapse slump indicates that the mix is too wet and if achieved, a fresh sample should be taken for a repeated test. True slump and collapse slump are different in terms of the shape of the slumped concrete.
What are the different types of slump test?
Several types of slump tests have been developed for characterizing the structural build-up of cement-based materials. These include the traditional slump test, the undisturbed slump spread test, the K-slump test, and the static Vicat test, among others.
What is an example of a slump?
An example of a slump is when a tired athlete collapses onto the ground after running a marathon.
