Compressive strength of concrete and rebound number. You should be able to view any of the pdf documents and forms available on our site. Tools and apparatus used for slump test equipment 1. 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. The tensile strength of concrete an important property when it is to be used in making road and runways, this test shall follow as per the is code 5816.
Pdf on jan 1, 2014, jozef junak and others published testing concrete samples prepared with different types of industrial wastes find, read and cite all the. Astm c31 aci making and curing concrete test specimens. Guidebook on nondestructive testing of concrete structures. The compaction factor test is carried out to measure the degree of workability of fresh concrete with regard to the internal energy required for compacting the concrete thoroughly. Pdf test file congratulations, your computer is equipped with a pdf portable document format reader. The specifications contain requirements for all concrete materials. For most of the works cubical moulds of size 15cm x 15cm x 15cm are commonly used. Mndot has incorporated the use of aashto tp2393 to verify the contractors water in concrete pavements. Concrete compacting factor test free download as powerpoint presentation.
Highway concrete pavement technology development and. Sampling the first step is to take a test sample from the large batch of concrete. 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. Strength test results from cast cylinders may be used for quality control, acceptance of concrete, or for estimating the concrete strength in a structure for the purpose of scheduling construction operations such as form removal or for evaluating the adequacy of curing and protection afforded to the structure. It tests the ability of unreinforced concrete beam or slab to withstand failure in bending. The type of break of a cylinder needs to be assessed and should be classified according to figure 2 ofastm c39. The cement powder is ordered in bags by weight eg 20 kg and type eg type gp. Standard method of test for resistance of concrete to chloride ion penetration salt ponding test the aashto t259 test commonly referred to as the salt ponding test is a long term test for measuring the penetration of chloride into concrete. The first freezethawrelated deterioration expected for pavement concrete exposed to deicing salt would be salt scaling. Pdf testing concrete samples prepared with different types of. For investigating low standardcured test results, aci 318 design.
This delay in placing concrete is extremely important when the test is on the first load of concrete of the day. Consistency and workability are often confused with one another. This is a direct tension test in which a concrete specimen is held at the ends and pulled apart, inducing uniaxial tensile stress in it. Collect a sample of concrete to perform the slum test. Slump test doesnt give accurate results for the low workability of concrete when the slump is concrete proportioning, mixing, and testing supplemental lab manual prepared by mutlu ozer objectives concepts background experimental procedure report requirements discussion objectives students make concrete according to the mix design. Pdf nondestructive and semidestructive diagnostics of. 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.
Archived portland cement concrete testing manual fhwa. Measurement of concrete thickness and detection of defects. Cylinder molds can be metal or plastic, so long as they are nonabsorbent, nonreactive to concrete, and maintain their shape and dimensions under all conditions. Compressive strength of concrete cube test pdf, procedure, results the compressive strength of the concrete cube test provides an idea about all the characteristics of concrete. Cylindrical specimens are tested in accordance with astm c 39, standard test method for compressive strength of cylindrical concrete specimens. The consistency, or stiffness, indicates how much water has been used in the mix.
Samples are taken during production and required tests are then carried out on the samples. Slump and kelly ball testing would be performed to investigate workability of mixture. Vertical shaft kilns were replaced with rotary kilns and ball mills were used for grinding cement. Jobtask analysis jta for aci certification of concrete. Compaction factor test workability test of fresh concrete. Field test sections were constructed during 1992 as part of the strategic highway research program shrp investigation of the frost resistance of concrete. In this method, the steel rod or steel probe is fire on the concrete surface by a sudden explosion. 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. For estimating the inplace concrete strength, astm c 31 provides procedures forfieldcuredspecimens. Illinois test procedure 161 resistance of concrete to rapid freezing and thawing 53.
Under con tinuous favorable conditions, concrete continues to. Slump test is used to measure consistency of fresh concrete mix. Jobtask analysis jta for aci certification of concrete field testing techniciangrade i continued page 3 of 4 approved 1072019 astm c231c231m, standard test method for air content of freshly mixed concrete by the pressure method understand the scope and the significance and use of the test method, including the applicable. Mix the concrete at agitating speed for all revolutions over 150. The concrete cube specimens are held in a compression testing machine under a fixed load. Water is used by the litre or kilogram 1 litre of water 1 kilogram. Tensile strength of concrete test procedure civil planets. Inspect all materials used in the construction of concrete work at their source, on the job, or both.
Slump is a measurement of concretes workability, or fluidity. By this single test one judge that whether concreting has been done properly or not. Inspect all materials used in the construction of concrete. It estimates the strength of concrete from the depth of penetration of a steel rod. Testing chloride penetration resistance of concrete. The break type that yields the most accurate reading is the hourglass. Nowadays concrete testing experts are using the ndt test like penetration resistance test to determine the relative strength of the concrete in the structure. Specification for moulds for use in tests of cement and concrete. Nondestructive testing of concrete methods of test. Compression test is the example of destructive test. Method of tests for strength of concrete iit kanpur. Because concrete is an excellent material for resisting compressive loading, it is used in dams, foundations, columns, arches and tunnel linings where the principal loading is in compression. Concrete ingredients when mixed have considerable amount of entrapped air depending on the workability.
Flexural test evaluates the tensile strength of concrete indirectly. Stand firmly on the footpieces and fill the volume of the cone with the sample. A test result is the average of at least two standardcured. The flexural test on concrete can be conducted using either three point. Astm c42c42m is the standard test method for obtaining and testing the strength of. The concrete cube test result will be satisfactory but the concrete in the structure would have a much lower strength. The slump plate should be clean, firm, level and nonabsorbent. Materials natural coarse aggregate and siliceous fine aggregate with maximum size of 38 in. The stiffness of the concrete mix should be matched to the requirements for the finished product quality. Pdf determination of concrete strength by core test. Effects of sodium sulphate and frost action find, read and cite all the research you need on.
Strength is usually determined by means of test cylinders made of fresh concrete on the job and tested in compression at various ages. The tensile strength of concrete is generally in the range of 10 % to 12% of its compressive strength. Out of many tests applied to the concrete, compressive strength is more important and it gives an idea about all the characteristics of concrete. Arioz and others published determination of concrete strength by core test. Concrete 1 concrete a composite material that consists essentially of a binding medium, such as a mixture of portland cement and water, within which are embedded particlesorfragmentsofaggregate,usuallyacombination of. This tip facilitates the understanding of core testing for acceptance of concrete, the corresponding astm standard and how it is used. Obtain samples for strength tests by the same procedure as for slump or air test. The most satisfactory way of establishing a correlation between compressive strength of concrete and its rebound number is to measure both the properties simultaneously on concrete cubes.
A slump test is a method used to determine the consistency of concrete. Concrete is by far the most versatile and most widely used construction material worldwide. Astm c31 making and curing concrete test specimens in the field when strength is used as a basis for acceptance of concrete, specimens must be molded and cured according to astm c31. Consistency is a general term to indicate the degree of fluidity or the degree of mobility. The compression test measures concrete strength in the hardened state. The compacting factor test is performed to find out the workability of concrete. Nondestructive and semidestructive diagnostics of concrete structures in assessment of their durability article pdf available march 2015 with 7,540 reads how we measure reads. The coarse and fine aggregates are ordered in cubic metres by maximum size eg 20 m3 of size 20 mm. Compaction factor test of concrete for low workability. This video animation, animated video explains the procedure for determination of workability by compaction factor test.
Guide to evaluation of strength test results of concrete aci 214r11 3 s sample standard deviation, an estimate of the population standard devi ation, also termed s overall s statistical average standard deviation, or pooled standard deviation. This test uses a microwave oven to drive the water out of fresh concrete. High workable mixes have lesser entrapped air than low workable mixes. Guide to evaluation of strength test results of concrete. Tests on concrete concrete slump test, compression test. The compression test shows the best possible strength concrete can reach in perfect conditions. Measurement of concrete thickness and detection of defects using ultrasound methods ed pristov1, wayne dalton2, and garland likins3 abstract the use of nondestructive evaluation nde techniques has proven to be effective in determining the. It can also be defined as the relative plasticity of freshly mixed concrete as indicative of its workability. Flexural test on concrete significance, procedure and.
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