Fresh behavior of concrete was assessed by conducting slump test. Measure the amount of slump in inches from the bottom of the straight edge to the top of the slumped concrete at a point over the original center of the base. Furthermore, to construct the hybrid model, this research collected a dataset including actual concrete slump tests from a hydroelectric dam construction project in. Most people in the business agree that a typical slump for ordinary decorative concrete applications would be in the 4 to 5inch range, but theres. Slump test is used to measure consistency of fresh concrete mix.
In a collapse slump the concrete collapses completely. Slump test is the most commonly used test of measuring workability of concrete. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. How does the strength of concrete vary with a slump value. Mar, 2019 since 1922 slump test has been widely used to check out the concrete workability at the site. This delay in placing concrete is extremely important when the test is on the first load of concrete of the day.
Dec 05, 2017 astm c143 standard test method for slump of concrete aci concrete field testing technician level 1. Concrete slump test or slump cone test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the progress of the work. Uji slump adalah suatu uji empirismetode yang digunakan untuk menentukan konsistensikekakuan dapat dikerjakan atau tidakdari campuran beton segar fresh concrete untuk menentukan tingkat workability nya. Consistency and workability are often confused with one another. But it is not suitable for very wet or very dry concrete. The slump operation shall be completed in a maximum elapsed time of 2 12 minutes. It is used to check the workability of freshly made. 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. Slump test slump test is the most commonly used method of measuring consistency of concrete which can be employed either in laboratory or at site of work. Tools standard slump cone 100 mm top diameter x 200 mm bottom diameter x 300 mm high small scoop bulletnosed rod 600 mm long x 16 mm diameter. In a true slump the concrete simply subsides, keeping more or less to shape. It is used to check the workability of freshly made concrete for the easy placement of concrete. Any slump specimen which collapses or shears off laterally gives incorrect result and if this occurs the test shall be repeated with another sample. It is performed to check the workability of freshly made.
For the third slump test, our group successfully got true slump with 710 mm slump. The common factor among sources is the reproduction of pain as tension is applied to the dura during testing. 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. Since 1922 slump test has been widely used to check out the concrete workability at the site. 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. Each batch and mix was evaluated to obtain the workability by slump test as shown in fig.
Compressive strength of concrete cube test, procedure. 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. The stiffness of the concrete mix should be matched to the requirements for the finished product quality. Tests on concrete concrete slump test, compression test. The true slump is the only reliable condition to get an idea about the workability of concrete. The purpose of this test is to avoid using the lowquality concrete mix for casting. Astm c231 standard test method for air content of freshly mixed concrete by the pressure method duration. Then you fill the cone to the halfway point and tamp it with another 25 strokes. This test method was originally developed to provide a technique to monitor the consistency of unhardened concrete. So it is our responsibility to ensure that the concrete is in good quality.
Tools standard slump cone 100 mm top diameter x 200 mm bottom diameter x 300 mm high small scoop bulletnosed rod 600 mm long x. The unit includes sampling and slump testing to a set range or tolerance. There are two methods for selecting the concrete mix proportions, by weight. Jul 17, 2017 slump is a test to measure the plasticity wetness of concrete when it is placed. The slump test the slump test is done to make sure a concrete mix is workable. Concrete slump test experiment procedure civilology.
Also indirectly to determine of concrete consistency or stiffness. Standard test method for slump of hydrauliccement concrete. Materials natural coarse aggregate and siliceous fine aggregate with maximum size of 38 in. Concrete slump test procedure applications, types, uses and. Concrete slump test procedure applications, types, uses. In fact the cone is smaller than the abrams cone h 57 mm. Mar 14, 2017 concrete slump should not be specified. Concrete workability, quantified by concrete slump, is an important property of a concrete mixture. Slump is a test for the rigidity of uncured concrete. Oct 03, 2017 astm c231 standard test method for air content of freshly mixed concrete by the pressure method duration. Concrete slump test the concrete slump test measures the consistency of fresh concrete before it sets.
To test slump, you fill the slump cone to 14 of its height and tamp down with 25 strokes of a 34inch steel rod. The concrete slump test is an onthespot test to determine the consistency as well as workability of fresh concrete. The test is an empirical test that measures the workability of fresh concrete. 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. Standard slump and flow table tests columbia university. After the material is introduced into the water, the mixing speed in increased from 1,200 rpm to 15,000 rpm for 1 minute. The slump measured should be recorded in mm of subsidence of the specimen during the test. Commence the slump test as soon as possible after sampling of concrete as per standard procedure described in chapter 2. Tools standard slump cone 100 mm top diameter x 200 mm bottom diameter x 300 mm high small scoop bulletnosed rod 600 mm long x 16 mm diameter rule slump plate 500 mm x 500 mm. The slump is carried out as per procedures mentioned in astm c143 in the united states, is. Slump is a measurement of concrete s workability, or fluidity. Vee bee consistometer test determines the mobility and some extent of compactibility of concrete. Lower slump concrete is very stiff, and higher slump concrete is more fluid.
Introduction the concrete slump test is used for the measurement of a property of fresh concrete. However you define it, though, the bottom line remains the same. If concrete maintains the actual shape of the mould, it is called zero slump which represents stiff, consistent and almost no workability. The reason for the popularity of the slump is that the equipment is light and portable and the test is simple and easy to carry out. A small variation in slump caused by improper procedure or equipment, may cause the rejection of an entire. The slump cone mold is lifted vertically upward and the change in height of the concrete is measured. Slump test is an empirical test that measures workability of fresh concrete, it is performed to check consistency of freshly made concrete. The scope of this field test is to ensure the concretes workability and consistency before casting it. Acceptance testing includes tests on plastic concrete for slump, air content, density unit weight, temperature, and tests on hardened concrete for strength and other durability properties as required in contract documents or project specifications. Slump test measures the consistency or workability of concrete. Concrete slump is generally known to affect the consistency, flowability, pumpability, compactibility, and harshness of a concrete mix. Concrete slump test uji slump beton sharing materi. Additional information on workability and quality of concrete. Testing slump in your concrete mix and why it is important.
This test can be used as a control test and gives an indication of the concrete uniformity from batch to batch. Concrete compressive strength for general construction varies from 15 mpa 2200 psi to 30 mpa 4400 psi and higher in commercial and industrial structures. Slump is a measurement of concretes workability, or fluidity. Slump test is the most commonly used method of measuring consistency of concrete which can be employed either in laboratory or at site of work. A sample is poured into a mini slump cone, rodded, struck off, and lifted at 2 minutes.
Pdf estimating concrete workability based on slump test with. If the slump and air content meet requirements, complete the discharge. Even with the increase in knowledge of concrete rheology, the slump test remains the predominately used test method for measuring concrete workability. Roll the drum for a certain time to completely mix the concrete inside. Summary of concrete workability test methods the university of. In a shear slump the top portion of the concrete shears off and slips sideways. 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. Each test has their importance, and there is no unique test to measure the workability of concrete in total. Slump test kelly ball test k slump test vee bee consistometer test flow table test. Concrete slump test is a standard and quick test to determine the proportions of various ingredients for preparing concrete of desired consistency and workability. The kistner concrete mix achieved a high slump of nearly 9 inches, using a water cement ratio wc of 0. The slump test is done to make sure a concrete mix is workable. The test was repeated again, return used concrete to the mixer and remix for 30 seconds.
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. Tests on concrete concrete slump test, compression test for. Concrete slump test uji slump beton mengukur nilai slump. If the slump test is to determine whether or not the concrete is to be accepted, the sample must be taken from the early part of the load. Empty the sample from the container onto the sampling try. Code and standards requirements for acceptance testing. Mar 09, 2017 2 the concrete slump test is used to determine of concrete s workability, or fluidity. Here are the steps to do the slump test of concrete. Standard slump and flow table tests objective to determine the reference slump value for kistner concrete mix design and to calibrate it against an equivalent measure using a flow table. The cone is placed at the centre of a square of glass or other similar material on which are depicted diagonals and medians. Standard test method for the slump of hydraulic cement concrete. The ease with which one can work with concrete is called workability this can be measured using a simple test called the slump test. The mini slump test is a variation of the slump test with reduced size.
Workability of concrete is mainly affected by consistency i. Any slump specimen, which collapses or shears off laterally gives incorrect result and if this occurs, the test should be repeated with another sample. With the exception of the widely used slump test, the few methods that have been studied extensively have generally failed to gain widespread acceptance. Vee bee consistometer test workability of concrete test. Slump test is an empirical test that measures workability of fresh ppt. This difference in height in mm is the slump of the concrete. After this, you fill it to the 34 point and tamp it again. The measured slump must be within a set range, or tolerance, from the target slump.
The technique depicted below is adapted from mark dutton. It can be employed either in laboratory or at site of work. It is therefore important that the consistency of the mix is such that the concrete can be transported, placed and. Slump test procedure field testing gates concrete forming. 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. Hence, an accurate prediction of this property is a practical need of construction engineers. Compressive strength of concrete cube test, procedure, results. If, in the repeat test also, the specimen should shear, the slump shall be measured and the fact that the specimen sheared, shall be recorded. Astm c143 standard test method for slump of concrete aci concrete field testing technician level 1. Concrete slump test for workability procedure and results. Kekakuan dalam suatu campuran beton menunjukkan berapa banyak air yang digunakan. It is not a suitable method for very wet or very dry concrete.
In almost every country in the world people refer to the workability of concrete in terms of its slump. Filled to the top with one last layer, the mixture gets a. The slump test is a neural tension test used to detect altered neurodynamics or neural tissue sensitivity. Fill cone full by volume and rod 25 times with 58inchdi ameter x 24inchlong hemispherical tip steel tamping rod. Not equivalent to cpccco3033a slump test concrete unit descriptor this unit of competency specifies the outcomes required to slump test concrete to ensure the mix is workable and complies with the delivery docket and specified order. Never take the sample from the first concrete out of the mixer.
A slump test is a method used to determine the consistency of concrete. Compressive strength of concrete cube test provides an idea about all the characteristics of concrete. The consistency, or stiffness, indicates how much water has been used in the mix. Jan 24, 2018 this difference in height in mm is the slump of the concrete. Thoroughly mix the sample by shovelling to form a cone on the. The concrete slump test measures the consistency of fresh concrete before it sets. The slump test is described differently among sources. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction. Jul 16, 2018 slump test kelly ball test k slump test vee bee consistometer test flow table test. But then a slump test on that last truckload yields a 6. This guide is to be used in conjunction with the concrete mix design calculation for selecting proportions for initial concrete mix design. Slump is a test to measure the plasticity wetness of concrete when it is placed. It is used conveniently as a control test and gives an indication of the uniformity of concrete from batch to batch. Astm c143 standard test method for slump of concrete.
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