ACI Study Guides and Practice Test Videos. Welcome to SI Certs’ ACI reference page! We’ve gone through all of the ASTMs and gathered helpful information you can review to pass the ACI Level 1 Concrete Field Testing Technician test. Amazon.com: concrete moisture test kit. Skip to main content. Marge Plus Soil Moisture Meter, 3 in 1 Soil Test Kit Gardening Tools for PH, Light & Moisture, Plant Tester for Home, Farm, Lawn, Indoor & Outdoor (No Battery Needed) (Dark Green) 3.7 out of 5 stars 362. 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.
Definition. Slump is a, or fluidity. It's an indirect measurement of concrete consistency or stiffness.A slump test is a method used to determine the consistency of concrete. The consistency, or stiffness, indicates how much water has been used in the mix.
The stiffness of the concrete mix should be matched to the requirements for the finished product quality Concrete Slump TestThe concrete slump test is used for the measurement of a. The test is an empirical test that measures the workability of fresh concrete. More specifically, it measures consistency between batches. The test is popular due to the simplicity of apparatus used and simple procedure. Principle of Slump TestThe slump test result is a measure of the behavior of a compacted inverted cone of concrete under the action of gravity. It measures the consistency or the wetness of concrete.
Apparatus. Slump cone,. Scale for measurement,. Temping rod (steel)Procedure of Concrete Slump test:. The mold for the slump test is a frustum of a cone, 300 mm (12 in) of height.
Precautions in Slump TestIn order to reduce the influence on slump of the variation in the surface friction, the inside of the mould and its base should be moistened at the beginning of every test, and prior to lifting of the mould the area immediately around the base of the cone should be cleaned from concrete which may have dropped accidentally. Types Of Concrete SlumpThe slumped concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as;. Collapse Slump. Shear Slump. True SlumpCollapse SlumpIn a collapse slump the concrete collapses completely.
A collapse slump will generally mean that the mix is too wet or that it is a high workability mix, for which slump test is not appropriate. Shear SlumpIn a shear slump the top portion of the concrete shears off and slips sideways. ORIf one-half of the cone slides down an inclined plane, the slump is said to be a shear slump.
If a shear or collapse slump is achieved, a fresh sample should be taken and the test is repeated. If the shear slump persists, as may the case with harsh mixes, this is an indication of lack of cohesion of the mix.
True SlumpIn a true slump the concrete simply subsides, keeping more or less to shape. This is the only slump which is used in various tests. Mixes of stiff consistence have a Zero slump, so that in the rather dry range no variation can be detected between mixes of different.However, in a lean mix with a tendency to harshness, a true slump can easily change to the shear slump type or even to collapse, and widely different values of slump can be obtained in different samples from the same mix; thus, the slump test is unreliable for lean mixes. Applications of Slump Test.
The slump test is used to ensure uniformity for different batches of similar concrete under field conditions and to ascertain the effects of on their introduction. This test is very useful on site as a check on the day-to-day or hour- to-hour variation in the materials being fed into the mixer. An increase in slump may mean, for instance, that the moisture content of has unexpectedly increases. Other cause would be a change in the grading of the aggregate, such as a deficiency of sand. Too high or too low a slump gives immediate warning and enables the mixer operator to remedy the situation. This application of slump test as well as its simplicity, is responsible for its widespread use.Degree of workabilitySlumpCompactingFactorUse for which concrete is suitablemminVery low0-250-10.78Very dry mixes; used in road making. Vibrated by power operated.Low25-501-20.85Low workability mixes; used for foundations with light reinforcement.
Roads vibrated by hand operated Machines.Medium50-1002-40.92Medium workability mixes; manually compacted flat slabs using crushed. Normal reinforced concrete manually compacted and heavily reinforced sections with vibrations.High100-1754-70.95High workability concrete; for sections with congested reinforcement.
Not normally suitable for vibrationTable: Workability, Slump and Compacting Factor of concrete with 19 or 38 mm (3/4 or 1 1/ 2 in) maximum size of aggregate. Difference in StandardsThe slump test is referred to in several testing and building code, with minor differences in the details of performing the test. United StatesIn the United States, engineers use the ASTM standards and AASHTO specifications when referring to the concrete slump test. The American standards explicitly state that the slump cone should have a height of 12-in, a bottom diameter of 8-in and an upper diameter of 4-in. The ASTM standards also state in the procedure that when the cone is removed, it should be lifted up vertically, without any rotational movement at allThe concrete slump test is known as 'Standard Test Method for Slump of Hydraulic-Cement Concrete' and carries the code (ASTM C 143) or (AASHTO T 119).
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United Kingdom & EuropeIn the United Kingdom, the Standards specify a slump cone height of 300-mm, a bottom diameter of 200-mm and a top diameter of 100-mm. The British Standards do not explicitly specify that the cone should only be lifted vertically. The slump test in the British standards was first (BS 1881-102) and is now replaced by the European Standard (BS EN 12350-2). Slump Test VideoQues: 1What is the ideal value of slump?Answer: 1In case of a dry sample, slump will be in the range of 25-50 mm that is 1-2 inches. But in case of a wet concrete, the slump may vary from 150-175 mm or say 6-7 inches. So the value of slump is specifically mentioned along the mix design and thus it should be checked as per your location.Slump depends on many factors like properties of concrete ingredients - aggregates etc. Also temperature has its effect on slump value.
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.
Concrete Strength Test
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.
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. We can get the result from the only true slump.