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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The residual crack width associated with a hairline crack may be influenced by the presence of anchors installed in acl crack path and the crack width cycling history of the test member. A limitation on the minimum embedment length of adhesive anchors is necessary to ensure conformance with the design method deemed to satisfy the anchor design requirements of ACI M, Appendix D.
ACI M addresses this situation by matching capacity reduction factors to anchor performance categories that are, in turn, established through a series of reliability tests.
This reliability acci checks for the sensitivity of anchor bond strength to suboptimal hole cleaning effort 50 percent in dry concrete conditions.
Use a maximum coarse xci size of either For anchors to be tested in shear, it is more important that the crack transect the anchor 355.4 at the concrete surface. Bulk adhesives mixed in open containers without automatically controlled metering and mixing of adhesive components.
Please fill this form, we will try to respond as soon as possible. It is assumed that all aspects of anchor installation are described in the MPII for all installation conditions, including installation direction and concrete temperature.
Greater values for spacing of reinforcement are allowed as in the case of narrow concrete components, for example: Limitations on use based on environmental conditions in accordance with Table For Temperature Category A, perform tests at the short- and long-term test temperatures. Fill the pilot hole with potable water and ensure that the hole remains flooded for a minimum of 8 days sci hours.
Where anchors are to be installed in other orientations, such as horizontal and overhead, tests are required to validate the performance of the adhesive anchor system for these orientations. ACI and its members disclaim liability for damages of any kind, including any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of this publication.
355.4M-11 Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Where concrete temperatures may remain elevated over weeks or months, they should be considered longterm elevated temperatures. 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.
As such, it is important that the concrete used for these tests is as closely related as possible to the concrete used for the suitability tests. Other methods may be used subject to assessment by the primary testing laboratory. If a concrete mixture is used for test members that do not conform to the mixture requirements listed herein, a description of the concrete mixture components and proportions shall be included in the test report.
Proper use of this document includes periodically checking for errata for the most up-to-date revisions. Perform tension tests at standard temperature. Testing and assessment criteria are providedfor various conditions of use, including seismic loading; sustained loading;aggressive environments; reduced and elevated temperatures; and fordetermining whether anchors are acceptable for use in uncracked concreteonly, or acceptable for service both in cracked and uncracked concrete.
ACI does not make any representations with regard to health and safety issues and the use of this document. As such, changes in the lower crack width with increasing crack cycling are likely to be due to other causes, for example, changes in the bond relationship of the embedded reinforcement in the test specimen.
The ITEA shall determine which tests, if any, shall be performed to determine whether the change in the adhesive anchor system is equivalent to the previously assessed adhesive anchor system. Nevertheless, the evaluation of the adhesive anchor system should include a critical evaluation of the effectiveness of the MPII as an instrument for ensuring correct anchor installation and the MPII should be viewed as a component of the adhesive anchor system, subject to quality control requirements and specifically linked to the test data generated as part of the qualification under this standard.
For overhead and horizontal orientations, test largest diameter for which recognition is sought. Cast the concrete test members in lengths of steel or plastic pipe having a wall thickness as required to prevent slice splitting during punch testing. Report the temperature at which the requirements are fulfilled as the minimum concrete temperature at the time of installation.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
This security feature prevents the reproduction and redistribution of downloaded documents. The determination of the coefficients a and b is sensitive to the number of data points evaluated and should be approached with care.
Where preheating of adhesive cartridges to reduce viscosity and facilitate adhesive flow is specified in the MPII, observations should be made to determine whether this results in retarded cure, lowering of the glass-transition temperature, and impaired resistance to creep.
The results of tests on cylinders and cores shall not be combined for the establishment of the mean compressive strength at a given concrete age. For more information, contact ACI.
While it is assumed that the on-site installation personnel will generally conform to the MPII, 3554 potential for inadvertent deviations from the MPII, particularly with respect to hole cleaning procedures, forms the basis for many of the reliability tests. All rights reserved including rights of reproduction and use in any form or by any means, 3355.4 the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.
The exception to this is that thermocouples are not required if it can be experimentally demonstrated that the test procedure will consistently produce test member temperatures in accordance with the target temperatures. Long-term elevated temperatures are those that occur over extended periods of time. Heat-treatment may also be used to increase the rod strength.
Drilling with diamond core bits, dry or wet, produces a smoother hole wall with a layer of drilling slurry or dust that zci impair bond development. Initiate cracking in the test acu.
Temperature Category A provides a standard approach that assumes a potential long-term elevated temperature consistent with hot climate exposures and a short-term temperature reflective of diurnal cycling in such climates for a given sun exposure duration and concrete mass. There can be more than one combination of these values. This document is intended for the use of individuals who are competent to aco the significance and limitations of its content and recommendations and who will accept responsibility for wci application of the material it contains.
Tests shall be performed to establish the appropriate shear capacity in these cases. Anchor edge distance and spacing.
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If the MPII does not contain sufficient information to permit the establishment of a cleaning effort that represents 50 percent of the specified effort, hole cleaning should be omitted. Capsule diameter corresponds approximately to nominal anchor diameter.
Report this value in Table Aggregates shall be in accordance with 4. Jewellery Road vehicles engineering Railway engineering Shipbuilding and marine structures Aircraft and space vehicle engineering Materials handling equipment Packaging and distribution of goods Textile and leather technology Clothing industry Agriculture Food technology Chemical technology Mining and minerals Petroleum and related technologies Metallurgy Wood technology Glass and ceramics industries Rubber and plastic industries Paper technology Paint and colour industries Construction materials and building Civil engineering Military affairs.
The establishment of bond failure solely on the basis of physical observation of the failed specimen, however, is problematic. Open and close the crack times at a maximum frequency of approximately 0. Perform tests in accordance with 4. In addition, the displacement of the anchor under sustained load just prior to tension testing to failure shall stabilize to the degree that an assessment can be made that failure is unlikely to occur.
For anchors assessed for use in cracked concrete and resisting seismic loads, it may be advantageous to establish the reference shear capacity of the anchor system in cracked concrete.