Pressure wash building and repair surfaces as indicated. Questions about packaging, pavement preparation, preferred applications, placement limitations, curing times, and much more. Nov 24, 2008 for concrete sidewalks, ideally the ratio of cement to water should be about 2. One of the key requirements for any kind of repair system is to have adequate bond strength between the existing concrete substrate and overlay throughout the service life. How to patch concrete the workshop by fred and gerry. Viewpoint field applications of insitu tensile pulloff tests. Acoustic emission signals of pulloff test for concrete. White lightning mortar patch latex caulk sherwinwilliams. Concrete repair of wastewater plant chlorine contact basin a 109 x 20 reinforced concrete chlorine contact basin with 9 high concrete baffle wall was deteriorating due to freeze and thaw cycling. Concrete fixitall 25 lb fastsetting, nonshrinking gray. This statement is based on the correlation values with the compression strength test, both in cylindrical and prismatic specimens, compared to the values of pull off test. Jan 26, 2016 match patch pro is sound enough to make a knife.
Bond test 20 purpose the bond test is used to conduct a pull off test in accordance with astm c1583, test method for tensile strength of concrete surfaces and the bond strength or tensile strength of concrete repair and overlay materials by direct tension pull off method. Astm d7234 19 standard test method for pulloff adhesion. Such testing follows astm c 1583, standard test method for tensile strength of concrete surfaces and the bond strength or tensile strength of concrete repair. Good, strong epoxy concrete patch material by kris this product provides a very hard, and durableappearing patch for 12 holes and cracks. Magazine of concrete research, volume 59, issue 10, 1 dec 2007 771776. Commonly applied at driveways, sidewalks, patios, above ground foundations and in various types of masonry. Automated pulloff adhesion testers specialized concrete. D2651 guide for preparation of metal surfaces for adhesive bonding. Quikrete ea concrete repair mix is an air entrained, microsilica enhanced, fiberreinforced cementitious concrete mix designed for partial and fulldepth vertical and horizontal repairs. The pulloff strength of a coating is an important factor to consider when selecting an appropriate coating to protect surfaces made of metal, plastic, wood, concrete and glass.
This is reflected in the huge number of standards dedicated to the method. Remove existing unsound materials from areas indicated to be restored. The lok test system is used to obtain a reliable estimate of the inplace strength of concrete in newly cast structures in accordance with the pullout test method described in astm c900, bs 1881. Concrete patch faqs answers to frequently asked questions about unique fast set concrete patching materials. The test has been used successfully since then to evaluate the resistance of concrete. This guide provides a recommended method of evaluating the adequacy of concrete. Nov 14, 2010 small cracks are easy to patch with quikrete gray selfleveling concrete crack seal. The proceq dy2 family of automated pulloff testers covers the complete range of pulloff applications with unmatched ease of operation and the. Tuffpatch mp is 100% solids, nonshrink epoxy polymer patch kit designed for multipurposes. The pull off test was developed in england in the 70s, with the aim of determining the strength of concrete in situ, due to problems with concrete produced with highalumina cement 5. However, it is also possible to use an actual portion of a concrete member. Tensile bond strength of a high performance concrete bridge. Repair and overlay materials by direct tension pulloff.
Once you have a good, sticky surface for the concrete, simply add water to premixed concrete and patch the crack. Pull off test to evaluate the compressive strength of. Astm c1583 c1583m standard test method for tensile. The results obtained with the pull off test showed that it is fully feasible to be employed to estimate the strength of concrete in situ. For large or deep cracks, you can use quikrete sand mix or the companys concrete bonding adhesive. This statement is based on the correlation values with the compression strength test, both in cylindrical and prismatic specimens, compared to the values of pull off test both with r 2 above 0. Most repair projects are fairly simple using some of the.
Pulloff adhesion testing for concrete repairs request pdf. This test method is not appropriate for determining the pulloff strength of the frp from the patch material. Interstate products concrete patch epoxy repair kits are as easy as 1,2,3. These methods are used in completing the field condition survey of buildings. Concrete repairing mainly includes removing unsound concrete and replacing it with repair or overlay materials. The standard test method covered in astm d454117 standard test method for pulloff strength of coatings using portable adhesion testers is used for evaluating the pulloff strength otherwise known as adhesion of a coating system from metal substrates. Abraid the surface of the concrete in the test area with a carbide stone or wire brush to remove any laitance and deposits.
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. Pulloff testing is the most widely used test method to assess bond strength. This twopart, industrialstrength epoxy permanently bonds concrete, wont shrink or crack and creates an extremely hard surface that is stronger than concrete. The force required to pull the stud from the surface, together with the carrier, is measured.
An additional test method is required to determine the pulloff strength of the patch from the substrate concrete. Pulloff testing or bond testing is one of the most widely used test methods in the construction industry. Magazine of concrete research, volume 57, issue 5, 1 jun 2005 273282 the pulloff test for concrete patch repairs. The product comes in a squeeze tube, and fills and seals cracks in concrete up to 12inch wide. Fully automated pulloff adhesion testers for concrete. Remove paint, stains and plant material from all surfaces.
Reliability of the pulloff test for in situ evaluation of. Concrete repair of wastewater plant chlorine contact basin a 109 x 20 reinforced concrete chlorine contact basin with 9 high concrete. Concrete bond strength, pulloff and anchor pullout testers. Concrete epoxy patch kits floor ramp concrete patch. Concrete patch repair material for small and minor concrete. Pulloff adhesion testing for concrete repairs authors. The test sample is subjected to increasing tensile stress until failure occurs. Bond characterization between concrete base and repairing. The elcometer 510 automatic pulloff adhesion tester accurately measures the strength of the bond between the coating and the substrate.
For cementbased materials mortar or concrete the pulloff test is preferred partly because it is relatively easy to carry out. Automatic hydraulic pump ensures smooth and continuous. Match patch pro concrete crack and hole repair system youtube. After the concrete has fractured by this test, the holes left in the surface are first cleaned of the dust by a blower. Tensile bond testing of concrete repairs springerlink. Product description concrete patch repair material for cracks, and holes in concrete.
Patching and repairing concrete can be easy or difficult, depending on the project and the amount of deterioration. This study investigates the acoustic emission signals of concrete slab strengthened with carbon fibre reinforced polymer cfrp under pulloff test. The purpose of the test is to measure the maximum tensile strength of the render and other overlying materials on concrete. An evaluation of equipment and procedures for tensile. Applications for the elcometer 106 adhesion test include paint or plasma spray on bridge decking, coatings on steel, aluminium, concrete. This article will report some of the data we have collected. If you mix your own concrete patch, use one part portland cement to twoandahalf parts of fine, clean sand. How to test a capacitor, air conditioner capacitor, run by dependable. The weakest path could be along an interface between two layers or a cohesive facture within one layer or a combination of these. The development and maintenance of a sound band is an essential requirement of a concrete patch repair. Repair, evaluation, maintenance, and rehabilitation research program. Tensile bond strength of a high performance concrete.
Heavier concrete patch jobs call for one part of portland cement to two parts of sand to three parts of gravel. Tensile bond tests are increasing in popularity as a means of measuring this adhesive property, both on site for quality control and in the laboratory for materials evaluation. A weak or degraded concrete surface or concrete exhibiting signs of laitance either visible or. Existing concrete overlay fracture surface, a f adhesive steeldisk tensile pull off force, f t figure 1. Adhesion of the new patch to the original concrete is generally considered to be an important criterion in judging the success of the repair. As the concrete settles, scrape the surface with a trowel.
Special concrete resurfacers will make a concrete floor look like new. Bond strength and pulloff testing refer to a test method outlined in astm c1583 and d4541. This water cleanup formula provides a durable seal for repairing holes in concrete, mortar, cinder block, stucco, stone, limestone and brick. Repair to concrete structures often involves breaking out cracked concrete and replacing this and areas of spalling with a mortar or concrete. Three types of surface preparations were prepared namely without surface preparation, normal surface preparation and boring surface preparation. Schematic of pulloff test principle the pulloff strength s po is defined as the.
The obtained pull off strength can be used for the following purposes. Permanent solutions to all types of concrete patching including industrial concrete patch applications, repairing and resurfacing needs as well as a versatile product line featuring concrete floor patch, wall, overhead, indoor, outdoor and more patching applications. Jan 30, 2017 this feature is not available right now. Field applications of insitu tensile pulloff tests to. How to replace repair rotted sub floor, rotten floor. Tensile bond tester technologies mctc concrete materials. How to pour a concrete slab for beginners diy by odell. Pulloff strength testing is not necessary for total installation surfaces not exceeding 50 m 2, for coatings of no more than 250 m 2 and for impregnation works. Dy2 pulloff testers construction materials testing. Stir concrete patching compound using a margin trowel or putty knife. One tensile strength pull test of the prepared concrete substrate was taken in each hydrodemolition test area. If you use a readymix concrete patch, all you need to add is water.
The bondtest is used to conduct a pulloff test in accordance with. This aids in achieving sufficient bond between the steel disk and the overlay surface. The use of pull off tests in the evaluation of adhesion strength have been critically outlined recently ramos et al. The testers provide a complete record of the pulloff test, confirming that the test was carried out in accordance with the applicable standard. Sealgreen concrete patch repair is a cementitious stainable material design for grouting small hairline cracks, divots created from the removal of wood carpet strips, and small holes in interior concrete floors. The technique generally consists of establishing entry and venting ports at close intervals along the cracks, sealing the crack on exposed surfaces, and injecting the epoxy under pressure. At thermalchem, we believe that our concrete patch repairs are great at solving even the toughest cracks. The pulloff strengths of the concrete substrate must comply with the values in the table. Were based in london and the south east but operate right across the country, offering pull testing. Perform concrete restoration work in the following sequence. The quality of concrete repairs is determined by the adhesive strength between the repair material and the substrate. Reliability of the pulloff test for in situ evaluation of adhesion strength article in construction and building materials 31. A parametric study through pulloff testing authors.
Pull off adhesion tester elcometer 106 the elcometer 106 adhesion tester is easy to operate and fully portable, and provides a numerical value for adhesion. The dy2 provides a complete record of the pulloff test. Pullout tests on hardened concrete the constructor. The test determines the greatest perpendicular force in tension that a surface area can. Step 5b spread and texture the concrete patch to match the surrounding concrete. The specially formulated mix contains super plasticizer for improved durability and placement characteristics. For small patching jobs, use a premixed concrete patch. Pull off test on render and other overlying materials on concrete. The most common method of nondestructive field testing is through a process called sounding. If you use readymix concrete patch, all you need to add is water. Automated pulloff adhesion testers for concrete strength the quality of concrete repairs is determined by the adhesive strength between the repair.
Numerical and experimental assessments the successful application of a concrete repair system is often evaluated through pulloff testing. It has long been known that one of the major influences on the result of a pulloff test. This paper discusses the main issues relevant to tensile bond testing, namely material properties, surface. The general procedure for performing a pull off test can be summarized as follows. Learn how to repair concrete from demolition to caulking cracks.
Concrete pulloff testing is used to confirm the substrate strength prior to the installation of repair materials or as quality assurance for the installation of overlays or fiber wrap. Concrete adhesion pulloff test the pulloff adhesion test determines the maximum perpendicular force that a surface area can bear before a temporarily stuck plug of material is detached. The tensile bond strength pulloff test is a quick, and simple method for determining how well repair material or an overlay is bonded to underlying concrete. Concrete is also often a major building material in and around homes. Destructive and nondestructive field testing of concrete. The pull off test, also called stud pull test in which an adhesive connection is made between a stud and the carrier or object to be tested by using a glue, possibly an epoxy or polyester resin, that is stronger than the bond that needs to be tested. Sounding involves striking the concrete surface and interpreting the sound produced. Pulloff adhesion testing for concrete repairs magazine of concrete. Evaluation of bond strength between overlay and substrate. Patch and repair existing concrete structures as indicated. This test method serves as a means for uniformly preparing and testing coated surfaces, and evaluating and reporting the results.
Bond test 20 purpose the bond test is used to conduct a pulloff test in accordance with astm c1583, test method for tensile strength of concrete surfaces and the bond strength or tensile strength of concrete repair. Somebody drove something over the concrete that was heavier than the concrete was designed to. Field testing of concrete structures include nondestructive testing and destructive testing. Recorded parameters include the timedate of the test, test disc size, maximum load applied, calculation of bond strength, applied load rate, test. The method describes a test for determination of the bond strength of a construction consisting of a standard concrete substructure on which a repair mortar or a repair system has been cast. The bond test is used to conduct a pulloff test in accordance with astm c1583, test method for tensile strength of concrete surfaces and the bond strength or tensile strength of concrete repair. Proceedings of the institution of civil engineers structures and buildings.
Very durable, it can also be aesthetically pleasing. C1583 test method for tensile strength of concrete surfaces and the bond strength or tensile strength of concrete repair and overlay materials by direct tension pulloff method d16 terminology for paint, related coatings, materials, and applications. In recent years, the pulloff test method has gained. Although the sand patch test 14,25 and the profilometric method 44,65 are still popular for evaluating the surface morphology of concrete, tayeh et al.
It can be also used for testing repaired concrete sections. Epoxy injection method is used for cracks as narrow as 0. Astm d454117 pulloff strength of coatings test ansi blog. Unique fast setting high strength mortar faqs, concrete patch. Astmd7522 standard test method for pulloff strength. Evaluate bond strength of coatings and cementitious material with pullof testing. Development of a con crete repair code was a key goal of the vision 2020 2 program which identified strategies to improve the concrete repair. Youre wondering about unique highperformance, fastsetting mortar. Note this test method is a destructive test and spot repairs are required. Concrete pulloff testing is used to measure the direct tensile strength of. 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. This type of testing is used to evaluate and provide a qualitative value of coatings applied to a concrete or other substrate surface.