While ACI gives no limitations on maximum anchor diameter, for anchors beyond this dimension, the testing authority should decide if the tests described. Click here to preview This standard prescribes testing programs and evaluation requirements forpost-installed adhesive anchors intended for use in concrete. Concrete in Accordance With ACI and the IBC . Qualification of Post-Installed Adhesive Anchors in Concrete (ACI. ).
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Where this condition is not satisfied, the product shall be reported as unqualified. These tests are optional; however, failure to assess this condition will result in restrictions on the use of the adhesive anchor system. Qualification for seismic loading is optional in conjunction with qualification for cracked concrete 8. For a sample size of 10 to 20 replicates, one of the tested anchors shall be permitted to exhibit a maximum displacement of 3 mm after the initial 20 cycles and 4 mm after cycles.
The residual crack width associated with a hairline crack may be influenced by the presence of anchors installed in the crack path and the crack width cycling history of the test member. There can be more than one combination of 355.44 three minimum values. Anchor performance data in accordance with Other axi are permissible.
The type of brush, such as steel and nylon, and its diameter should be specified in the MPII together with any other details, such as air pressure, that might affect the effectiveness of the holecleaning process. Confined tests do not generate large spall cones, and as such serve to reduce the volume of concrete required for the test program.
The drilling action during setting of spin-set capsule anchors is critical to the correct mixing and curing of adhesive. Click here to buy this book in print or download it as a free PDF, 3555.4 available. Adhesive anchors may exhibit concrete breakout failure before attainment of the maximum bond stress achievable for the adhesive in question. While it is assumed that the on-site installation personnel will generally conform to the MPII, the potential for inadvertent deviations from the MPII, particularly with respect to hole cleaning procedures, forms the basis for many of the reliability tests.
This standard prescribes testing programs and evaluation requirements for post-installed adhesive anchors intended for use in concrete under the design provisions of ACI M. Perform a confined tension test to failure Fig. Limitations on installation conditions in accordance with Table Proof loads by anchor type, diameter, embedment, and location. If steel failure occurs, the embedment depth shall be reduced for all round-robin tests. Tests are optional if test results of Test 1b can be shown to be statistically equivalent to or greater than the results of Test 1a.
Alternatively, conduct confined tests with an embedment of approximately 7da in accordance with 4. These items are not eligible for return. Installation direction—Installation direction is the orientation of acj axis of the anchor relative to gravity. Following unloading of the test member, a residual crack width approximately 0.
Errata are not included for collections or sets of documents such as sci ACI Collection. You will be required to download the free plug-in to view any secured PDF document. Install anchors in concrete test members and allow them to cure at the stabilized temperature according to the MPII.
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Examples include bonded steel plates or external carbon fiber reinforcement. In these cases, it is necessary to increase the embedment to a point where bond failure occurs.
The use of a ramped loading function through the zero point of the cyclic load may be advantageous for operation of the testing apparatus.
Two mixture designs—one without and one with fly ash as a cement replacement—are intended to provide a representative sample of concrete compositions in North America. Acceptable methods and minimum number and duration of operations required for removal of dust or drilling flour from the hole wall 4. Other methods of preventing rotation of the washer shall be permitted, provided it can be shown they do not affect the anchor performance.
Hole diameter and depth. The National Academies Press.
The MPII as used in the testing and evaluation of the adhesive anchor system, reproduced in full. Acceptable displacements at proof load. Care should be taken in the characterization of failure modes based on test observations. The formation of limited-depth conical breakout surfaces shall also be considered as pullout failures. The load shall be applied using an unconfined test setup as shown in 4.
Users who have suggestions for the improvement of ACI documents are requested to contact ACI via the errata website at www.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
Theories regarding this effect include variations in concrete porosity, as reflected in the concrete density, and aggregate hardness. The Acii shall include information on storage conditions, shelf life, and all restrictions on installation conditions Subject the anchors to the sinusoidal shear loads specified in Table 8.
Use of lightweight aggregates can result in a reduction of bond strength.
Use drilling equipment and setting procedures that are representative of normal anchor installation as specified by the anchor manufacturer. Parallel crack openings are used because they represent the most critical condition for the anchor response to loading. Perform ack least 80 cycles. If thermocouples are not used in accordance with 7. Perform tension tests to failure with continuous measurement of load and displacement.
Significant latitude is given to the engineer of record in determining the parameters of the proof load program, which will depend in large part on the type, size, and quantity of anchors being installed.
Alternatively, it shall be permitted to correlate the chamber temperature with the test member 33 Table 8. Conduct tests on all-thread anchors that have been installed in accordance with the MPII. A companion specification in inch-pound units is also available. Factors of 355. importance in the assessment include completely filling the hole with adhesive, avoiding excessive adhesive run-out during the installation process, and preventing anchor element sag during adhesive cure.
Different anchor designs and adhesive types may exhibit a range of performance characteristics. Heat-treatment may also be used to increase the rod strength.