Place the mould on a smooth horizontal non porous base plate. Concrete slump test experiment procedure civilology. Pearce can provide concrete in various slumpranges, depending on strength and workabilityneeds. And more importantly, the stepbystep procedure of slump test followed by the list of cautions during the test and way to measure the workability from the test result. Compressive strength test of concrete cubes for cube test two types of specimens either cubes of 15cm x 15cm x 15cm or 10cm x 10cm x 10cm depending upon the size of aggregate are used. To determine the workability of concrete by slump test as per is. Because of it, it has been extensively applied for workability tests since 1922.
The scope of this field test is to ensure the concretes workability and consistency before casting it. Slumping cone is levelled off and surplus concrete is cleared from steel plate and slumping cone. Mould in the form of the frustum of a cone having the following internal dimensions. Astm c 143, standard test method for slump of hydraulic cement concrete, also requires making two slump tests, but does not allow either test to be used to judge the slump.
The mold for the concrete slump test is a frustum of a cone, 300 mm 12 in of height. Slump cone, scale for measurement, temping rod steel procedure of concrete slump test. Concrete workability, quantified by concrete slump, is an important property of a concrete mixture. Slump test provides immediate result about the consistency and workability of concrete, that is the reason it is used widely in all over the world since 1922. Compressive strength of concrete cube test pdf, procedure. Slump test of concretecone test procedure readcivil. Slump plate 500 mm x 500 mm procedure of slump test for concrete.
This research proposes a machine learning model for predicting. Mar 09, 2017 the test is an empirical test that measures the workability of fresh concrete. To conduct this test, a mould is arranged on a even, horizontal and dry surface. The apparatus for slump test consists of a metallic mould in the form of a frustum of a cone with internal dimension as follow.
Doe method, and material proportional justified by the result of slump test. Then take the slumptest apparatus and clean it from inside also apply oil to it and to the bottom surface. This test is not suitable for very dry and high stiff concrete. We usually perform slump test on site and lab due its ease and results. If a shear or collapse slump is achieved, a fresh sample should be taken and the test is. Theslump test must be performed within 2 12minutes after obtaining the composite sample. The slump test is a means of assessing the consistency of fresh concrete. Once the slump loss during pumping can be determined, acceptance or rejection of concrete based on slump can then be determined at the delivery point. The concrete slump test is an empirical test that measures the workability of fresh concrete.
The slump flow test, using the traditional slump cone, is the most common field test and is in the process of being standardized by astm. The flow table test procedure does not conform with astm standard and is as follows. Concrete field testing technician course overview cttp. The concrete slump test is an onthespot test to determine the consistency as well as workability of fresh concrete. Stand firmly on the footpieces and fill the volume of the cone with the sample. The water content was adjusted to compensate for the dry gravel and sand used in the lab. Slumping cone is filled and compacted according to standard slump testing procedures 2. Each job has different placement conditions, so the need to custom adjust concrete for each job can create a.
What is the procedure of carrying out a slump test for. Then put one third of the concrete in the cone and press it with the help of a 58 inch, roundended, tampering rod. If the sample is transported to a different location for specimen fabrication, remix the sample to ensure uniformity. It measures the consistency or the wetness of concrete which then gives an idea about the workability condition of concrete mix.
The steel slump cone is placed on a solid, impermeable, level base and. Cement and water combine chemically to bond the sand and coarse aggregate together. The concrete slump test is a very simple procedure to measure the workability of fresh concrete. Cpccco3033a slump test concrete modification history not applicable unit descriptor unit descriptor this unit of competency specifies the outcomes required to conduct a slump test to concrete to ensure the mix is workable and complies with the delivery docket and specified order.
The base is placed on a smooth surface and the container is filled with concrete in three layers, whose workability is to be tested. Concrete slump test procedure applications, types, uses. So it is our responsibility to ensure that the concrete is in good quality. Slump test procedure is to determine the workability of concrete. Roll the drum for a certain time to completely mix the concrete inside. Determination of workability of fresh concrete by compaction factor test aim. Fill the mould with the prepared concrete mix in 4 approximately equal layers. This test method was originally developed to provide a technique to monitor the consistency of unhardened concrete. The unit includes sampling and slump testing to a set range. May 09, 2009 kelly maunder of ground engineering conducting a standard concrete slump test. Site testing slump test always do your slump test before making your cubes to ensure the concrete is usable.
Concrete slump is generally known to affect the consistency, flowability, pumpability, compactibility, and harshness of a concrete mix. Is the slump test of value as a measure of consistency or. Jun 08, 2012 then take the slump test apparatus and clean it from inside also apply oil to it and to the bottom surface. After the concrete leaves the truck, it is usually out of the producers control. Standard test method for slump of hydrauliccement concrete. Then place it on the smooth metallic surface, and fix it firmly. Concrete slump testing is used to evaluate the flow characteristics of freshly mixed concrete. The test is carried out in accordance with bs en 123502, testing fresh concrete. The test is performed to check the consistency of freshly mixed concrete in a specific batch. Procedure for concrete compression test concrete sample.
Astm c143143m standard test method for slump of hydraulic cement concrete. Concrete slump test for workability procedure and results. For most of the works cubical molds of size 15cm x 15cm x 15cm are commonly used. Determination of workability of fresh concrete by slump test aim. May 16, 2014 slump can be tested for acceptance at the point of discharge or at the point of placement, writes verifis eric koehler. Compressive strength of concrete cube test, procedure. Rheometers are being used to measure the basic flow properties of freshly mixed concretes 238. Slump cone 100 mm 4 in upper dia, 200 mm 8 in lower dia and 300 mm 12 in height tamping rod 600 mm 24 in high, 15 mm 58 in dia and hemispherical tip at both ends. By measuring the consistency of fresh concrete before it sets, this test can indicate improperly mixed solutions. Begin and complete slump test within 212 minutes, maximum.
In a true slump the concrete simply subsides, keeping more or less to shape. After mix design, you may have doubt, is this design will be ok. The concrete slump test is known as standard test method for slump of hydrauliccement concrete and carries the code astm c 143 or aashto t 119. Clean the internal surface of the mould and apply oil. A little extra effort to observe good practice is the key to ensure that the concrete properties are properly evaluated.
Chapter 17 tex415a, slump of portland cement concrete section 1 overview 400a, concrete test procedures 172 081998 112004 section 1 overview effective august 1998 november 2004. It is limited to concrete formed of aggregates of less than 38 mm 1. Test concrete slump at point of discharge or point of. A small variation in slump caused by improper procedure or equipment,may cause the rejection of an entire load of concrete. The slump is done following the methods described in astm c143 in the united states, is. Air content of freshly mixed concrete by the pressure method 41. The mold for the test is in the form of the frustum of a cone having height 30 cm, bottom diameter 20 cm and top diameter 10 cm. United kingdom and mainland europe edit in 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. Nd t 119 and aashto t 119, slump of hydraulic cement concrete. Let us check how can we do slump test of fresh concrete. The slump test result is a measure of the behavior of a compacted inverted cone of concrete under the action of gravity. Tests on concrete concrete slump test, compression test. The slump plate should be clean, firm, level and nonabsorbent.
Some forms are submitted to the mndot concrete engineering unit and all other forms are filed in the project file for internal use only. Field concrete samples are prepared, cured and tested according to astm standard procedures. It is used, indirectly, as a means of checking that the correct amount of water has been added to the mix. It also ensures that the slump loss is gradual, as evidenced by the slump loss test described below. To conduct a slump test, concrete is placed into an inverted cone in three stages, using a metal rod to tamp down the concrete after every stage. It is used conveniently as a control test and gives an indication of the uniformity of concrete from batch to batch. Slump test each layer is rodded 25 times totechnician begins to fill mold in settle. The slump test as 1012, part 3 determining the consistency of concrete. Each layer is temped 25 times with a standard 16 mm 58 in diameter steel rod, rounded at the end.
Because it involves lowcost tools and can be quickly done in situ, it is used extensively on most construction sites. The tamping rod is of steel 16 mm diameter and 60cm long and rounded at one end. The purpose of this test its to place tension on the dural sheath of the sciatic nerve. The requirement pertains to observing the concrete displacement after the slump cone has been removed. It does not, however, measure either characteristic separately or directly. Pdf concrete slump classification using glcm feature extraction. The slump test is used for checking the workability of concrete. This test indicates the watercement ratio and the properties of materials and also admixture etc.
Yes, the slump test can be useful as an indication of consistency and, for certain mixtures, can also indicate workability. Consistency refers to the ease and homogeneity with which t. Slumping cone is filled and compacted according to standard slump testing procedures. No matter, slump test is a leader among the above tests. It gives quick result about the workability of concrete. More specifically, it measures consistency between batches. In a shear slump the top portion of the concrete shears off and slips sideways. Now place the mould cone on the metallic steel plate or on any smooth surface. Concrete inspection procedure online templatestore. First the patient slumps forward, rounding the shoulders. The compression test shows the best possible strength concrete can achieve in perfect conditions. The glass disc attached to the swivel arm is moved and placed just on the top of the slump cone in. It is used to check the workability of freshly made concrete for the easy placement of concrete. Concrete slump test procedure slump test of concrete.
When a truck mixer reaches the checkpoint, the quality engineer should check the delivery note to ensure that the concrete delivered is in compliance with the concrete grade required for the concrete element to be cast. Concrete is an artificial stone which is obtained after hardening the homogenous mixtures of cement, water, aggregates and sometime admixture andor additive to modify the fresh and hardened concrete. It can be employed either in laboratory or at site of work. Astm c143 aci slump test of hydraulic cement concrete. What is the procedure to perform concrete slump test in. Under laboratory conditions, with strict control of all concrete materials, the slump is generally found to increase proportionally with the water content of a given concrete mixture, and thus to be inversely related to concrete strength. Sep 16, 2014 here are the steps to do the slump test of concrete. It is therefore important that the consistency of the mix is such that the concrete can be transported, placed and finished sufficiently easily and without segregation. Its reproduction is prohibited unless authorized by company name page 1 of 18.
Concrete slump test is a simple and lowcost test which is prepared in the laboratory or at the construction site for the determination of workability and consistency. Slump test measures the consistency or workability of concrete. Thoroughly clean the inner surface of frustum cone and it should be free from moisture content and adherence of any old set concrete. The slump is carried out as per procedures mentioned in astm c143 in the united states, is. Obtain samples for strength tests by the same procedure as for slump or air test, except obtain the sample from the middle half of the load whenever possible. The compression test measures concrete strength in the hardened state. Hence, an accurate prediction of this property is a practical need of construction engineers. Patient should be sitting on the edge of the table. Estimating concrete workability based on slump test with.
The purpose of this test is to avoid using the lowquality concrete mix for casting. It requires less apparatus when compared with the other tests. Slump test shouldnt be carried if the aggregate used in concrete is above 40mm. Sample of concrete is taken, using the correct sampling procedure, directly from the delivery truck s initial discharge 2. This test method describes the procedure for determining the slump of freshlymixed plastic. The slump test consists of several different steps. One of the major problems that you had faced in your field work is concrete compaction during mixing. Concrete is placed into a cylindrical steel mold with an inner diameter of 36 mm. Making and curing concrete test specimens in the field 70. Collect a sample of concrete to perform the slum test. Here are the steps to do the slump test of concrete.
If the slump test fails to meet the range limit as dictated by the british standard shown in the table below then the load should be rejected. The base is 200 mm 8in in diameter and it has a smaller opening at the top of 100 mm 4 in. The slump flow of concrete is not only determined by the water content, but that is also influenced by other concrete ingredients. The test is popular due to the simplicity of apparatus used and simple procedure. California test 555, method of test for slump of fresh portland cement concrete pdf. Measure slump from the top of the mold to the displaced original center of the concrete. Slump test of concretecone test procedure workability. The slump test is perhaps the most widely used because of the simplicity of the apparatus required and the test procedure. Slump test of concrete learning technology youtube. Slump test is performed in the sheet metal cylindrical pot of the consistometer. The slump test is suitable for slumps of medium to low workability, slump in the range of 5 260 mm, the test fails to determine the difference in workability in stiff mixes which have zero slump, or for wet mixes that give a collapse slump. This test plays a vital role in ensuring immediate concrete quality in a construction project.
The internal surface of the mould is thoroughly cleaned and freed from superfluous moisture and adherence of any old set concrete before commencing. The test is an empirical test that measures the workability of fresh concrete. Kelly maunder of ground engineering conducting a standard concrete slump test. Chapter 17 tex415a, slump of portland cement concrete. The aim of this study is to classify concrete slump using image processing technique.
The slump cone is completely filled without consolidation, the cone lifted, and the spread of the concrete measured. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. The slump test is treated as the most easy workability test toward concrete that offers low cost and instant results. In a collapse slump the concrete collapses completely. The concrete producer would generally prefer to test at the point of discharge.
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