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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It is generally acceptable to check the performance of the specimen at the beginning of the test series. 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, 35.4 the basis for many of the reliability tests. Then increase the load on the anchor to a constant tension load Nsust,lt as given by Eq. As both of these tests involve exposure to water, evaluation of the adhesive for susceptibility to hydrolyzation is included as well.
There is no limit to the number of times a document may be viewed on your computer. Use of lightweight aggregates can result in a reduction of bond strength. Where anchors are to be tested in tension, reinforcement should be placed near the surface and toward the outer 355.4 of the member.
Testing Assessment Test no.
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Members are encouraged to participate in committee activities that relate to their specific areas of interest. Holding cmin constant and increase smin until the requirements are fulfilled. Methods for ensuring the integrity of randomly acj product throughout the custody chain include stamping or signing over the packaging, recording serial and batch numbers, and photographing the sampled product.
For anchors that do not meet the threshold values for the lowest anchor category, a further reduction in the limiting characteristic bond stress is zci.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
The mean residual capacity of the anchors in the test series shall be equal to or greater than percent of Neq as given in Eq. Care should be taken in the characterization of failure modes based on test observations. Testing and acii 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.
Acceptable displacements at proof load.
Use minimum member thickness hmin for these tests. Apply external loading to both ends of the reinforcement to facilitate development of uniform strain over the length of the reinforcing.
For Temperature Category A, perform tests at the short- and long-term test temperatures. Positioning of the ac in the crack is likewise a matter of judgment. The MPII should provide acl instructions for hole cleaning with the required degree of specificity to permit evaluation of the 50 percent hole cleaning effort.
For deeper embedments, use of multiple capsules may be specified by the manufacturer. Bit wear should, nevertheless, be monitored during the test program. Choose Product Language English. Position crack initiators so the capacity of the tested anchor is not affected by their presence.
Sometimes concrete breakout surface formation is observable in the test and in other cases it may not reach the concrete surface before the associated fracture process in the concrete precipitates a bond failure.
Project a straight line from the origin of the loaddisplacement curve with a slope corresponding to the stiffness as calculated in No. Qualification of adhesive anchors exclusively for short-term loads is not permitted by this standard.
If thermocouples are not used in accordance with 7. Clean the hole in accordance with the reduced cleaning effort specified in 7. Because these documents are revised frequently, the reader is advised to contact the proper sponsoring group if it is desired to refer to the latest version. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains.
Other test methods shall be permitted if approved by the ITEA. It is the responsibility of the user of this document to establish health and safety practices appropriate to the specific circumstances involved with its use.
Options include installation at lower concrete temperatures 8. To reduce the potential for uncontrolled slip during load reversal, the alternating shear loading shall be permitted to be approximated by the application of two half-sinusoidal load cycles at the desired frequency connected by a reducedspeed ramped load, as shown in Fig.
The use of a ramped loading function through the zero point of the cyclic load may be advantageous for operation of the testing apparatus.
Preferably, formed concrete surfaces should be used for shear testing. In this case, where the bond stress rises and falls across several diameters in a random manner, xci minimum derived bond stress should be taken across all diameters. Eastern and Atlantic Time Zones.
If the additional testing performed using Table 3.