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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What are the securities? It is the responsibility of the user of this document to establish health and safety acl appropriate to the specific circumstances involved with its use. Bulk mixing and delivery of adhesives for example, those with paddle mixers in bucketswhile appropriate for some applications, may not provide anchor performance consistent with the assumptions of this standard.
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The use of alternate tests to address other 3355.4 is at the discretion of the ITEA. 35.4 displacements are greatest in the early stages, monitoring frequency should be high initially, but reduced over time. Holding smin constant and increase cmin until the requirements are fulfilled. Upon loss of adhesion, both the anchor element and adhesive material are extracted together from the concrete. The design method deemed to satisfy the anchor design requirements of ACI M, Appendix D, is based on an analysis of an anchor database with a maximum diameter of The friction factor shall be taken as a lower-bound value.
Reproduction and Redistribution Restricted: For the purpose of these tests, support the test member, that is, slab and beam, with a shear span length, which is the distance from anchor to support, not less than 1. Fill the pilot hole with potable water and ensure that the hole remains flooded for a minimum of 8 days or hours.
With the test member unloaded, install the anchor in a closed hairline crack that is sufficiently planar to ensure that the crack will approximately bisect the anchor location over the extent of the anchor loadtransfer zone. Refer to characteristic value. It shall be permitted, however, to transport specimens prepared by the regional laboratories in the different geographic regions to the primary testing laboratory for testing. Installation direction—Installation direction is the orientation of the axis of the anchor relative to gravity.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Raise the temperature of the test chamber to the maximum long-term test temperature 3355.4 Category A or B according to Table 8. Acceptable displacements at proof load.
For ongoing installations over an extended period, the special inspector shall make regular inspections to confirm correct handling and installation of the product. Project a straight line from the origin of the loaddisplacement curve with a slope corresponding to the stiffness as calculated in No. Any applicable errata are included aaci individual documents at the time of purchase.
For the frequency of displacement monitoring, refer to 7. Note the use of unconfined tests for reference tests can lead to an unconservative assessment if the unconfined reference tests result in concrete cone failures. Failure of an anchor to develop the required tension resistance in any cycle prior to completing the loading history specified in Table 8.
In addition, the value of 1. The optional exposure condition 355.4 sulfur dioxide 8. 35.4 and assessment criteria are providedfor various conditions of use, including seismic loading; sustained loading;aggressive environments; acj and elevated temperatures; and fordetermining whether anchors are acceptable for use in uncracked concreteonly, or acceptable for service both in cracked and uncracked concrete.
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.
Ready to take your reading offline? Long-term concrete temperatures are roughly constant over significant periods of time. Maintain load at Nsust,ft throughout the freezing-andthawing test. The mean residual capacity of the anchors in the test series shall be at least percent of Veqas acj by Eq. The intermediate 3554 shall be taken as least 3 mm larger than the smallest diameter and the diameter most closely representing the arithmetic mean of the smallest and largest diameters.
Depending on the manner in which the reference tests are conducted, they may also serve as service-condition tests for the system Chapter 8. The committee would like the recognize Christopher LaVine for his significant contributions to this document.
Produce the alkaline fluid by mixing water with potassium hydroxide KOH powder or tablets until the 35.4 value of They are delivered with a bulk dispensing machine whereby metering and mixing of the components are automatically controlled avi dispensing through a metering manifold and disposable mixing nozzle.
The frequency of monitoring displacements shall be chosen to demonstrate the anchor characteristics. If tests at the long-term test temperature are performed with Nsust in accordance with Eq. It is important that the crack width measurement devices reflect the crack width at the anchor location.
The use of confined tests is permitted under certain conditions and can enable the 355. of reference tests for establishing characteristic limiting bond stress values. Follow special procedures where the MPII includes them for low-temperature installation conditions. You will be required to download the free plug-in to view any secured PDF document.
Qualification for seismic loading is optional in conjunction with qualification for cracked concrete 8.