Concrete workability, high performance concrete, slump, compacting factor, vebe time, viscosity, mobility, fluidity. Collapsed slump this is an indication that the watercement ratio is too high, i. Workability is most often assessed through the slump test aashto t 119, with a desired range in slump for eot concrete often specified between 50 and 150 mm 2. Summary of concrete workability test methods the university of. Before adding plasticizers or superplasticizers to your fresh concrete, you need to check the workability of your concrete. British standards can be obtained in pdf or hard copy formats from the bsi online shop. Test procedure aashtq t 161 this test is used as an indicator of the amount of clay size material in the in the fine aggregate.
States which use this test for portland cement concrete specify a minimum sand equivalent between 70 and 80. Even with the increase in knowledge of concrete rheology, the slump test remains the predominately used test method for measuring concrete workability. These provisions are covered in chapter 19 of aci 31814. A slump test ensures concrete will pour and work as expected. This delay in placing concrete is extremely important when the test is on the first load of concrete of the day. Remember that slumps less than 12 may not be adequately plastic, and slumps greater than 9 may not be adequately cohesive for the slump test to have significance. Slump is a measurement of concretes workability, or fluidity. C2, w0 f0, s0, c0, w0 f3, s0, nrmca expanding the concrete. With the direct method, in the laboratory, this test shows a coefficient of variation of about 22. Inspect all materials used in the construction of concrete. The last 5 conditions affect the quality of the concrete in both the structure and in the specimens. Choose from individual products or required components contained in our convenient slump test sets. Hence, an accurate prediction of this property is a practical need of construction engineers.
The stiffness of the concrete mix should be matched to the requirements for the finished product quality. A little extra effort to observe good practice is the key to ensure that the concrete properties are properly evaluated. Sampling concrete mix m15 is blended according to the specified mix design in the laboratory. Lai research fellow, department of civil and structural engineering, hk polyu visiting scientist, federal institute of materials res. Oct 02, 2016 slump flow concrete test bs en 12350 duration. These type of concrete is generally used for road construction. Sep 16, 2014 in the first pouring of concrete on a project a quality engineer and a consultant representative should be present to supervise or to check the concrete delivered on site.
Under con tinuous favorable conditions, concrete continues to gain strength indefinitely. The specimen is conditioned in an environment at a standard. Concrete workability, quantified by concrete slump, is an important property of a concrete mixture. Zero slump zero slump is the indication of very low watercement ratio, which results in dry mixes. Materials natural coarse aggregate and siliceous fine aggregate with maximum size of 38 in. Workability is most often assessed through the slump test aashto t 119, with a desired range in slump for eot concrete often specified between 50 and 150 mm 2 to 6 in. Workability of concrete is mainly affected by consistency i. But first here is here is the meaning of slump test a measure of consistency of freshly mixed concrete equal to the subsidence measured to the nearest 14 inches molded specimen immediately after removal of the slump cone. The test results are compared within the framework provided by the desirability functions. To calculate slump, samples must be taken from the middle of the mixer discharge as opposed to the beginning or end. When cement is touched or rubbed in between fingers, it should give a smooth feeling. A thin paste of cement with water should feel sticky between the fingers. Articles on tests on concrete as a construction material for suitability to various civil engineering works for strength and durability. Slump test of concretecone test procedure workability of.
Concrete has a great variety of applications because it not only meets structural demands but also lends itself readily to architectural treatment. Modern concrete production systems have not eliminated the need to monitor concrete. In buildings, concrete is used for footings, foundations, columns, beams, girders, wall slabs, and roof unitsin short, all important. About four tons of concrete are produced per person per year worldwide and about 1. Tests on concrete concrete slump test, compression test. Astm c143143m standard test method for slump of hydraulic cement concrete. Tex424a, obtaining and testing drilled cores of concrete. Concrete slump test equipment, slump cone, base, rod. The sampling and the test is performed under the following rules and laws. Concrete slump test experiment procedure civilology. The base is 200 mm 8in in diameter and it has a smaller opening at the top of 100 mm 4 in.
It was named portland cement because it looked like the. The mold for the concrete slump test is a frustum of a cone, 300 mm 12 in of height. The standard rebound hammer provides a simple, easy and inexpensive method to estimate concrete strength properties. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Concrete slump test for workability procedure and results. Tip 11 testing concrete cores the strength of cores is used to verify the quality and strength of concrete in structures.
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. Obtain samples for strength tests by the same procedure as for slump or air test. The slump test is done to make sure a concrete mix is workable. Specification for moulds for use in tests of cement and concrete. The test is carried out in accordance with bs en 123502, testing fresh concrete. Pdf concrete with mechanical crumbed rubber waste additive from used. Specifications for readymixed concrete limit drum revolution and mixing time to 250 drum revolutions. Standard test method for measurement of rate of absorption. Here are the steps to do the slump test of concrete. Cold weather concreting is the process of placement, finishing, curing, and protection of concrete during cold weather, as per aci 306. In this step, concrete mixtures are batched according to the experimental matrix and tests are conducted as defined in step 1. Chapter 12testing of cement part 1 page 61 a bed of cement is prepared in special permeability cell and have exact porosity e 0,500 weight a quantity of cement. Choose from individual products or required components.
Statistically analyze the results with the desirability functions and generate the optimal mixtures. This test plays a vital role in ensuring immediate concrete quality in a construction project. The term concrete refers to a mixture of aggregates, usually sand. Apparatus used for cone test procedure 1measuring scale 2tamping rod. Introduction to concrete portland cement association. Let us check how can we do slump test of fresh concrete. Nondestructive evaluation and accreditation of diagnostic.
The slump test is used for checking the workability of concrete. Concrete slump test equipment, slump cone, base, rod gilson co. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction. This research proposes a machine learning model for predicting. Introduction to durability and inplace infiltration of. If a small quantity of cement is thrown into the water, it should float some time before finally sinking. May 15, 2018 this video animation, animated video explains the procedure for determination of concrete slump test. Changes in the value of slump obtained during a job may indicate changes in materials, in the water content or in the proportions of the mix, so it is useful in. It is used, indirectly, as a means of checking that the correct amount of water has been added to the mix. The base is placed on a smooth surface and the container is filled with concrete in three layers, whose workability is to be tested. Mar 09, 2017 the slump test indicates the behavior of a compacted concrete cone under the action of gravitational forces.
Guidebook on nondestructive testing of concrete structures. Roll the drum for a certain time to completely mix the concrete inside. The steel slump cone is placed on a solid, impermeable, level base and. Gilson offers a solid selection of slump testing equipment meeting astm c143, aashto t 119, and bs 1881 standards for testing in the lab or field. Here is the other test that would determine the durability of concrete. Slump test of concrete learning technology youtube. The slump test indicates the behavior of a compacted concrete cone under the action of gravitational forces. The consistency, or stiffness, indicates how much water has been used in the mix. Mix the concrete at agitating speed for all revolutions over 150. Video about the field test of general characteristics of cement.
Tests on concrete concrete slump test, compression test for. The slump plate should be clean, firm, level and nonabsorbent. Inspect all materials used in the construction of concrete work at their source, on the job, or both. So it is our responsibility to ensure that the concrete is in good quality. Correlating slump, slump flow, vebe and flow tests to. To address durability of concrete, aci 318, building code requirements for structural concrete, has specific requirements for concrete for defined environmental exposure conditions. Pervious concrete from aci 522r10 report on pervious concrete.
Pdf porosity and durability of rubberized concrete researchgate. Begin and complete slump test within 212 minutes, maximum. Concrete slump test measures consistency and workability of fresh concrete, and indirectly, the watercement ratio of the concrete mix. The measured slump must be within a set range, or tolerance, from the target slump. As the sand equivalent number increases it indicates less clay sized material in the sample. American society for testing and materials astm standards are astm c 143 or astm c143m. However, the results of the test on concrete are affected by various factors such. The slump test is a means of assessing the consistency of fresh concrete. After removing, it is supported 150mm apart and a weight of 15kg uniformly placed over it. Permission to reproduce extracts from british standards is granted by bsi. A slump test is a method used to determine the consistency of concrete. 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.
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. 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. Slump test of concretecone test procedure workability. Archived portland cement concrete testing manual fhwa. The first 3 f actors do not affect the strength of the concrete in the structure, but cylinder test results do indicate lower strengths than the actual structure. If it felt rough, it indicates adulteration with sand. The three cube sample shall be taken from the delivered fresh concrete and kept it in the curing tank for 28 days or after 24 hours the concrete sample would be demoulded and it will be sent directly to the approved thirdparty laboratory to ensure its curing. The concrete slump test is an onthespot test to determine the consistency as well as workability of fresh concrete. Concrete having a different mix m15 or m20 etc with the suitable watercement ratio and can be prepared at the site or casting the 6 cubes after conducting the slump test.
The cold weather occurs when the average outdoor temperature is below 4. This video animation, animated video explains the procedure for determination of concrete slump test. Improper molding of the specimens may result in honeycombed sections in specimens. Water, particle size and distribution, even the texture of the material all can affect the slump value. Mixing time versus nslump for the adrd mixtures 8 rpm.
Chapter 4 concrete tex424a, obtaining and testing drilled cores of concrete manual of testing procedures 5 0899 0500 test specimens continued moisture conditioning submerge the test specimens in lime saturated water at 23. Determination of workability test for concrete civil engineering animated videos, civil. Pdf this paper investigates the effects of cement content and watercement ratio on workable fresh concrete properties with slump. Slump is a measurement of concrete s workability, or fluidity. Pdf effect of cement content and watercement ratio on fresh. The average void size, open and closed porosity are derived from the test results. Astm c143 aci slump test of hydraulic cement concrete.
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. It can also be defined as the relative plasticity of freshly mixed concrete as indicative of its workability. Properties of concrete while cement in one form or another has been around for centuries, the type we use was invented in 1824 in britain. Nondestructive evaluation and accreditation of diagnostic tests on concrete scct annual concrete seminar 2012 18 april 2012 ir dr wallace w. A small variation in slump caused by improper procedure or equipment,may cause the rejection of an entire load of concrete. Chapter 9 standard test procedures tests on concrete may 2001 page 9. Manual of aggregate and concrete testing1 introduction this manual is intended to supplement, not in any way to supersede, the variousastm test methods for sampling and testing aggregate and freshly mixed and hardened portlandcement concrete. The slump test the slump test is done to make sure a concrete mix is workable.
Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material. Introduction to methodology guidelines for concrete. 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. Properties of concrete concrete is an artificial conglomerate stone made essentially of portland cement, water, and aggregates. The purpose of this test is to avoid using the lowquality concrete mix for casting. The block is then immersed in water for three days. Method of tests for strength of concrete iit kanpur. Stand firmly on the footpieces and fill the volume of the cone with the sample. Standard test method for the slump of hydraulic cement concrete. Testing concrete in structures nondestructive testing determination of rebound number. The scope of this field test is to ensure the concretes workability and consistency before casting it.
The manual was prepared by committee c09 on concrete and concreteaggregates and has been accepted. 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. Vebe test vebe is a good laboratory test that has the advantage that the treatment of concrete during the test is comparatively closely related to. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. Feb 01, 2009 we use your linkedin profile and activity data to personalize ads and to show you more relevant ads. To assess the workability of concrete using compaction factor test apparatus compaction factor apparatus trowels hand scoop 15. Major changes in the test procedures and testing machine. Estimating concrete workability based on slump test with. Concrete slump is generally known to affect the consistency, flowability, pumpability, compactibility, and harshness of a concrete mix. The slump test is a practical means of measuring the workability. Collect a sample of concrete to perform the slum test.