Workability Test Of Concrete Pdf

Place the mixed concrete in the mould to about half of its height and compact it again. Not reliable because slump may be of any shape. Factors Affecting Workability The single most important nature of workable concrete is its lubricating nature. Materials for architects and builders.

The mould is then filled in four layers with freshly mixed concrete, each approximately to one-fourth of the height of the mould. The mould is placed on a smooth, horizontal, rigid and nonabsorbent surface. Not suitable for very wet concrete. Which brings us to what is by far the most popular some say overused measure of workability.

Generally aggregate are found in variety of shapes, such as. The slump test originated as a way for workmen to judge how easy their day was going to be using freshly mixed concrete. Wipe and clean the outside surface of the cylinder.

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Workability of Fresh Concrete by Compacting Factor Test

Wonderful, easy-to-use and precise explanations. To know more about me just visit AboutMe. Software Database Civil Engineering Links.

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Notify me of new posts by email. The concrete then settles or slumps, and the final height is subtracted from the original height of the cone and recorded.

Grading of aggregate have the maximum influence on workability. It gives fairly good results for concrete of low workability. Calculate the value of compaction factor using the following formula. When is a slump test carried out on site?

Due to vibrating action, the concrete starts remoulding and occupying the cylindrical container. If concrete maintains the actual shape of the mould, it is called zero slump which represents stiff, consistent and almost no workability.

When total void are less, excess paste is available to give better lubricating effect. The structural engineer wants higher strength and a good bond with reinforcing steel. If a concrete shows more lubricating nature, then it will have the following advantages, such as.

Air entraining agents are also used to increase the workability. For same degree of workability latter will require less water. Suitable for testing workability in laboratories Suitable for concrete of low workability Suitable to detect the variation in workability over a wide range Its results are more precise and sensitive. The apparatus used for doing slump test are Slump cone and Tamping rod. Compaction Factor Test According to this test, devenir un leader pdf the workability may be defined as the amount of applied work required to compact the concrete to its maximum density.

3 METHODS OF DETERMINING WORKABILITY OF CONCRETE

Use of Admixture This is one of the commonly used methods to enhance workability of concrete. Concrete workability is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated and finished with minimal loss of homogeneity.

From the practical point of view, the maximum size of aggregate to be used will depend upon the handling, mixing and placing equipment, thickness of section and quantity of reinforcement. But in case of a wet concrete, the slump may vary from mm or say inches.

Workability of Fresh Concrete by Compacting Factor Test

From Wikipedia, the free encyclopedia. Place the slump mould on a smooth flat and non-absorbent surface. On the whole this factor is only of secondary importance. Concreting of lightly reinforced sections without vibrations or heavily reinforced sections with vibrations.

According to this test, the workability may be defined as the amount of applied work required to compact the concrete to its maximum density. The factors which help concrete to have more lubricating effect to reduce internal friction for easy compaction are given below. Building Construction Vol. Thank you for sharing your thoughts.

Porous and non-saturated aggregate will require more water than a non-absorbant aggregate. Previous Sieve analysis test of Aggregates.

Slump test of Concrete

It has really helped me during researches and note taking after the lectures. Different Test Methods for Workability Measurement Depending upon the water cement ratio in the concrete mix, the workability may be determined by the following three methods. Geotechnical-Material Engineer. Only a true slump is of any use in the test.

When the settlement of concrete stops, measure the subsidence of the concrete in millimeters which is the required slump of the concrete. Some automated slump meters, such as the one by Verifi also can add water to the concrete mix in the delivery truck while in transit. Size of Aggregate Bigger size aggregates have following advantages as compared to smaller size aggregate. What is the ideal value of slump?

This type of slump is most desirable. What are the dimensions of the cone used in Slump Test? All the points are well presented in a manner so that it has become easy to understand, Nice post. Pour the concrete into the slump cone with the help of the funnel fitted to the stand.