The sample should be representative of the concrete supplied. Standard test method for pullout strength of hardened concrete. Pullout test a circular steel insert is located below concrete surface and pulled by means of a calibrated hydraulic jack against a reaction ring bearing on the surface. This studies the variation of construction materials in the mix. Trubolt wedge anchor technical data red head concrete. Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material.
Existing concrete overlay fracture surface, a f adhesive steeldisk tensile pull off force, f t figure 1. Out of these factors, surface texture of gfrp rebars is one of the most important parameters. Designed to provide recommendations for the safe and effective selection and installation of anchors for use in masonry and concrete, this code of practice improves the level of safety and eliminates the potential for fixing failure. Capotest in which a steel ring is expanded into a groove. The slump plate should be clean, firm, level and nonabsorbent. Were based in london and the south east but operate right across the country, offering pull testing. Service provider of pull out load testing services chemical anchor concrete core failure, chemical anchor pull out test offered by rrp raj, surat, gujarat. The test procedures use beams or cylinders that are made, cured and tested according to standardized procedures. Astm d723419 standard test method for pulloff adhesion. Obtain samples for strength tests by the same procedure as for slump or air test.
Cement and concrete ced 2 designator of legally binding document. Bond strength of bamboo reinforcement in light weight concrete 420 table 4 pull out test. Apr 15, 2012 this video shows a laboratory experiment for a pullout test on a reinforced concrete. Pull off test to evaluate the compressive strength of concrete.
Methods of testing bond in reinforced concrete, part 1. Collect a sample of concrete to perform the slum test. The quality of concrete repairs is determined by the adhesive strength between the repair material and the substrate. Astm c1583 c1583m standard test method for tensile.
Pdf estimation of compressive strength based on pullout bond. Martin and have found that it is complete and satisfactory in all respects. Pullout tests on hardened concrete the constructor. This video shows a laboratory experiment for a pullout test on a reinforced concrete. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Pulloff pullout pulloff or pullout testing generally involves the separation of two secured parts under tension. This correlation is achieved by measuring the force required to pull a steel disc or ring, embedded in fresh concrete, against a. Capo test measures the force required to pullout an embedded metal insert from a concrete specimen structure. The purpose of this test was to determine the adhesive bond pull out strength using mr.
This correlation is achieved by measuring the force required to pull a steel disc or ring. Over our 25 years in the industry were proud to have become known for our customer service, quality of work, delivering projects on time, on budget and for always doing things the proper way. A new pullout technique for inplace estimation of concrete. Bond stress behavior between concrete a nd steel rebar. The compression test shows the best possible strength concrete can reach in perfect conditions. One of the most popular and traditional bond tests is the direct pull out test, called the pull out test, normalized by rilem ceb fip rc6 3 and astm 4. A degree of correlation exists between compressive strength of 6. The use of a bond test to monitor concrete strength is being proposed by an international group. The results of average bar stress against average bond stress as measured by the bond transfer test are shown in fig. Pull off testing is the most widely used test method to assess bond strength. The test variables were concrete strength, embedment depth and edge distance. He concluded, that the property of the concrete measured by the pullout force for a 55 mm counterpressure was close to the one measured by standard cylinders. The separation can occur between the epoxy grout and the concrete foundation or it can occur between the anchor bolt and the epoxy grout itself. The proceq dy2 family of automated pull off testers covers the complete range of pull off applications with unmatched ease of operation and the.
What are different tests for concrete quality check. In brazil, the standard tests for this purpose are. It was noted that the pull out test conducted by choi et al. Critical investigation of pull o ut test via finite element modeling and analysis md. Bond 360 ml and anchor bolt when placed into existing concrete. The grove was made by cutting two lines using the concrete saw and removing the concrete in between by a power hammer as shown in figure 3. A new type of postinstalled wedge anchor b15g is presented. Pullout test of concrete blocks strengthened with near. A refined geometry of the anchor bolt and a careful choice of all the technical details allow the insert to work also in tensile stress states and to avoid much of the practical uncertainties that affect the commonly used procedures. Pull off testing is one of the most widely used test methods in the construction industry. It is then primed with epoxy glue and the hole is filled with a polymermodified mortar immediately thereafter and the surface is smoothened. Compressive test in drilled cores, rebound hammer test and ultrasonic test. Sampling the first step is to take a test sample from the large batch of concrete. The department standard specifications, section 106.
For a given bar stress the bond stress for the gravel concrete is approximately 40% lower than for the two lightweight concretes, this is difference is probably due to the. Part i plaster and concrete, and part ii gypsum products. At the site it is often seen that doing the tensile test on the anchors becomes very important. It was noted that the pullout test conducted by choi et al. Pull out load testing services chemical anchor concrete. Effect of surface texture on bond strength of gfrp rebar in.
The fundamental principle behind pull out testing is that the test equipment designed to a specific geometry will produce results pull out forces that closely correlate to the compressive strength of concrete. The counterpre s s u r e ring of the testing machine is placed against the surface of the concrete and load is hyd r aulically applied by turning the handle of the testing m a c h i n e. This standard, which is one in the series, covers the methods of test for evaluating the different physical properties of gypsum building materials. Astm c900 19 standard test method for pullout strength of.
Legally binding document step out from the old to the newjawaharlal nehru. Pull off testing made n wterland the proceq dy2 family of automated pull off testers covers the complete range of pull off applications with unmatched ease of operation and a unique capability to store a complete record of the test. About four tons of concrete are produced per person per year worldwide and about 1. An experimental investigation of bond in reinforced concrete joshua s. Stand firmly on the footpieces and fill the volume of the cone with the sample. It is a test of reinforced concrete composite materials to seeks to assess the strength of the bond between the concrete and the reinforcement. Fully automated pulloff adhesion testers for concrete. The fundamental principle behind pull out testing is that the test equipment designed to a specific geometry will produce results pullout forces that closely correlate to the compressive strength of concrete. Pdf bond stress behavior between concrete and steel.
Tests on concrete concrete slump test, compression test. C90019 standard test method for pullout strength of hardened concrete pull out strength. Pdf bond stress behavior between concrete and steel rebar. Hard copies prior to january 1, 2015 are controlled. This should be done as soon as discharge of the concrete commences. Schematic of pull off test principle the pull off strength s po is defined as the tensile pull off force f t divided by the area of the fracture surface a f. Bond strength of bamboo reinforcement in light weight concrete. Threaded rod is often used along with a nut andor square plate washer when embedded in concrete to achieve required pullout values. The variability of concrete is best studied by means of compressive strength tests. See chapter 2 concrete properties the compression test. He called the test lok test, the danish name of punch out test.
Conducting static compressive load test, vertical pull out load test and lateral load test as per is. A pull out test on a long plain reinforcement bar embedded. Historically hardened concrete has been tested primarily to determine whether the potential strength of the concrete delivered to a site will meet or exceed a value used in the design of the pavement or structure. We adhere to one of the most important codes of practice to affect the pull out testing industry, bs8539 standard. Tensile bond strength of a high performance concrete bridge. The calibration of the procedure has been performed on 3 classes of concrete and for 5 stress. Specimen id mark drill dia 12mm observed remark anchor fastener pulled out from 3. Workability measures how easy the concrete is to place, handle and compact. Introduction to concrete portland cement association. This edition of the frequency manual was prepared to make the frequency of sampling and testing conform to the. Bond test 22 testing examples bond test being performed for quality control of the bond between a wear resistant overlay and a concrete slab. Cutting the grove a special concrete saw with a diamond blade was used to cut the grove in the middle of the c.
The quality of the mix is judged by the slump test. The test results showed that if the failure mode is a concrete shear cone failure, the values calculated using the aci 34985 standard calculation method, without a strength reduction factor, will provide a good prediction. Evaluation of the pullout test to determine strength of insitu concrete. Anchor rods are embedded in concrete to support structural steel and can be used with epoxy in existing concrete applications. Normally, take samples during the discharging operation. This report discusses the process and the results from anchor pull out test conducted on site at e, harihar compound, mankoli. Loktest which uses 25mm diameter insert cast into concrete at depth of 25mm 2. Rebar anchor pull out test result rebar anchor fixing grout material. For the convenience of the users, this standard covering test methods on gypsum building materials has been prepared in twoparts as follows. University of washington graduate school this is to certify that i have examined this copy of a masters thesis by joshua s. History deserves to be remembered recommended for you. The reinforcement is smooth and embedded to almost the full length of the concrete specimen. Na grade of concrete m 30 anchor fastener penetration depth mm 75 ultimate pull out load kn 31.