Workability Concrete Test Sheet Lab
Measuring scale. Procedure Of Test:1. First, clean the inner surface of the empty mould and then apply oil to it.2. Set the mould on a horizontal non-porous and non-absorbent base plate.3. Fill the mould fully by pouring freshly mixed concrete in three equal layers.4. Stroke each layer 25 times with the standard tamping rod over the cross-section.5. After stroking 25 times the top layer is struck off level, now lift the mould slowly in the vertical direction without disturbing the concrete cone.
Use the measuring scale to measure the difference level between the height of the mould and the concrete sample.7. The subsidence of concrete is known as the slump and the value of slump is measured in mm.
Types of Slump:True Slump: The concrete mass after the test when slumps evenly all around without disintegration is called the true slump.Shear Slump: When one-half of the concrete mass slide down the other is called the shear slump. This type of slump is obtained in a lean concrete mix.Collapse Slump: When the sample is collapsed due to adding excessive water, it is known as collapse slump.
Zero Slump: For very stiff or dry mixes it does not show any changes of the slump after removing the slump cone. Advantages Of Concrete Slump Test:1. The procedure of slump test is simple and easy than any other workability test.2. Inexpensive and portable apparatus is required for this test.3.
Gilson Insights blog post defining concrete workability, factors that impact. Guide Sieve Analysis of Coarse Aggregate: From the Field to the Lab (Part 3). But opinions don't matter much when testing and documenting concrete. The form or profile of the slump is also noted and used to judge the reliability of each test. Concrete at a point over the original center of the base. The slump operation shall be completed in a maximum elapsed time of 2 1/2 minutes. Discard concrete. DO NOT use in any other tests. SLUMP TEST PROCEDURE (FIELD TESTING) 1 To obtain a representative sample, take samples from two or more regular intervals throughout the discharge of the.
Slump test can be performed at the construction site as well as in the laboratory. Limitations Of Concrete Slump Test:1. The slump test is limited to concretes with the maximum size of aggregate less than 38 mm.2. The test is suitable only for concretes of medium or high workabilities (i.e having slump values of 25 mm to 125 mm).3. For very stiff mixes having zero slumps, the slump test does not show any difference in concretes of different workabilities.Recommended Values Of Slumps For Different Concrete Mixes: Types Of ConcreteSlump Range In mm1.
Heavy mass construction25-502. Bridge deck25-754. Beams and slabs50-1005. Columns, retaining walls and thin vertical members etc.75-1506. Vibrated concrete12-25ALSO READ – IF YOU LIKED THIS ARTICLE THEN PLEASE SUBSCRIBE TO OUR NEWSLETTER.SaveSaveSave More Posts:.
The Concrete slump test is an on-the-spot test to determine the consistency as well as workability of fresh concrete. This test plays a vital role in ensuring immediate concrete quality in a construction project. It is used almost in every construction sites.The slump test is very simple and easy to handle. It also demands comparatively less equipment and can be done in a short period of time. These have made it very popular all over the world.
In the slump test, is not measured directly. Instead, consistency of concrete is measured which gives a general idea about the workability condition of concrete mix. Concrete Slump Test International StandardVarious international codes have specific testing standards for slump test. These standards specify methods, equipment for determining the consistency of fresh concrete by the slump test. For acceptance and reliability, It is essential to maintain strict compliance with these standards during the slump test for concrete. The standards for the concrete slump test are followings. American Society for Testing and Materials (ASTM): ASTM slump test standards are ASTM C 143, ASTM C143M.
The American Association of State Highway and Transportation Officials (AASHTO): AASHTO slump test standards are AASHTO T119, AASHTO BS1881. British & European standard: British & European slump test standard is BS EN 12350-2. Indian standard: IS 1199 – 1959Concrete Slump Test EquipmentSlump test requires some equipment to perform the test.
One can easily find these test kit set in the market. The test equipment must comply with the standards mentioned above. The equipment mainly used for slump test are followings. Concrete Slump Test Kit Set. Source: panairsan.com. Mould: Shape of the mould is a frustum of a cone. The cone is known as slump cone or Abrams cone.
Slump cone is made of steel, plastic, etc. Its height is 12 inches (30 cm). The diameter of the base opening is 8 inches (20 cm) and the top opening is 4 inches (10 cm). Base plate: Base plate may be made of Aluminum, polymer, steel, etc. It may be equipped with a holding attachment.
Tamping rod: Temping rod used in the slump test is made of steel. Tamping Rod is usually 24' long and has a diameter of 5/8' diameter. Temping rod used in the slump test is made of steel. Tamping Rod is usually 24' long and has a diameter of 5/8' diameter. Tape measure: Standard tap should be used for measurement.
Concrete Slump Test Procedure. Firstly, the internal surface of the mould is cleaned carefully. Oil can be applied on the surface. The mould is then placed on a base plate.
The base plate should be clean, smooth, horizontal and non-porous. The mould is filled with fresh concrete in three layers. Each layer is tamped 25 times with a steel rod. The diameter of this steel rod is 5⁄ 8 inch.
The rod is rounded at the ends. The tamping should be done uniformly. After filling the mould, excess concrete should be removed and the surface should be leveled. When the mould is filled with fresh concrete, the base of the mould is held firmly by handles.
Then the mould is lifted gently in the vertical direction and then unsupported concrete will slump. The decrease in height at the center point is measured to nearest 5mm or 0.25 inch and it is known as ‘slump’.Cautions Required During Concrete Slump Test. Inside of the mould and base should be moistened before every test. It is necessary to reduce surface friction. Prior to lifting mould, the area around the base of the cone should be cleaned from concrete which may be dropped accidentally.
Workability Factor Concrete
The mould and base-plate should be non-porous. This test should be performed in a place free of vibration or shocks. The concrete sample should be very fresh, the delay must be avoided and the test should be done just after mixing.Measurement of workability from the Slump TestIf shear slump or collapse slump occurs, the test should be repeated.
Workability Concrete Test Sheet Labels
We can get the result from the only true slump.