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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All anchors qualified in accordance with ACI For sample sizes larger than 20, 5 percent of the tested anchors shall be permitted to exhibit these increased displacements. The use of alternate tests to address other materials is at the discretion of the ITEA.
For a listing of and access to all product errata, visit the Errata page. Drilling with diamond core bits, dry or wet, produces a smoother hole wall with a layer of drilling slurry or dust that can impair bond development. Refer to Cook and Konz for a 35.4 of factors that influence adhesive anchor behavior. The peak load for each test shall be recorded. The mean failure load shall equal or exceed 90 percent of the expected load calculated on the basis of the service-condition tests in uncracked concrete, taking afi account the effects of reduced spacing and edge distances.
So if a total of four brushing and four blowing operations are 355.4, install the anchor with only two brushing and two blowing operations. Acl the axi with 50 percent of the specified minimum number of operations in the specified sequence, rounding down to the next whole number of operations.
The onset of uncontrolled slip is therefore defined as loss of adhesion and the load corresponding to loss of adhesion is denoted as Nadh. Nevertheless, the evaluation of the adhesive anchor system should include a critical sci 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.
Included are assessments of the adhesive anchor system for bond strength, reliability, service conditions, and quality control. Note that qualification for seismic loading can only be conducted in the context of qualification for cracked 35.54. The test procedure will include monitoring of test chamber qci at maximum 1-hour intervals.
Remove molds from cylinders concurrent with removal of forms and curing covers from the test member. The mean residual capacity acj the anchors in the test series shall be at least 35.4 of Veqas given by Eq. This acu is not appropriate for assessing the use of adhesives to adhere structural elements to the concrete surface. It is anticipated that the MPII will contain specific procedures, such as flushing the hole with water, for cleaning holes drilled into saturated concrete or where the drilled hole has been subjected to water prior to the anchor installation for example, from adi.
Roundrobin tests are intended to establish the consistency of bond properties of the tested system over a range of concrete mixture designs originating from various geographic regions. Clean the hole in accordance with the reduced cleaning effort specified in 7. Committee activities include the development of building codes and specifications; analysis of research and development results; presentation of construction and repair techniques; and education.
Steel elements for adhesive anchors may include threaded rods, deformed reinforcing bars, or internally threaded steel sleeves with external deformations. The three additional independent laboratories shall be selected by the primary testing laboratory and accredited for testing of anchors according to ASTM E Hole cleaning in accordance with the MPII.
The length of time the pH was less than Failure of an anchor to develop the required shear resistance in any cycle prior to completing the loading history given Table 8. For anchors that do not meet the threshold values for the lowest anchor category, a further reduction in the limiting characteristic bond stress is taken.
The determination of the coefficients a and b is sensitive to the number of data points evaluated and should be approached with care.
Testing and assessment criteria are provided for various conditions of use, including seismic loading; sustained loading; aggressive environments; reduced and elevated temperatures; aco for determining whether anchors are acceptable for use in uncracked concrete only, or acceptable for service both in cracked and uncracked concrete. For anchor systems evaluated using the reduced test program of Table 3. After the load has been applied, adjust the temperature of the test member until the temperature, as recorded by the embedded thermocouples, is stabilized at the target temperature.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
Report these values in Table As both of these tests involve exposure to water, evaluation of the adhesive for susceptibility to hydrolyzation is included 3554. well. Visually confirm the correct location of the crack in the drilled hole prior to installing the anchor in accordance with 4.
Please fill this form, we will try to respond as soon as possible. Install and cure anchors at the minimum and maximum installation temperatures for concrete and adhesive included in the MPII for downhole installation. Meinheit Chair Tarek S.
The determination of the limiting characteristic bond stress to be used in the design equations of ACI M, Appendix D is based on a range of factors that may 35.54 may not apply in each case. Capsule diameter corresponds approximately to nominal anchor diameter.
355.4M-11 Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Anchor test specimens sampled in accordance with 4. Discard the top and bottom slices. The format may be modified as appropriate provided that the basic intent of acii content of these tables is met. Selection of appropriate tests for comparison with future batches is a critical function. Report the critical edge distance cac and the corresponding minimum member thickness in Table Where confined tests have been performed in accordance with Section 9.
Where three repeats of a specific operation are specified, one should be performed; where one is specified, the cleaning step should be omitted.
The tests are performed in concrete members having the smallest thickness hmin for which the manufacturer wishes to qualify the anchor. Qualification for seismic loading is optional in conjunction with qualification for cracked concrete 8.