ACI 355.4 PDF
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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Capsule anchors that are set with hammering action only, hammer-set may have other parameters that are critical in this regard. ACI committee documents are 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.
Raise the temperature of the test chamber to the maximum long-term test temperature either Category A or B according to Table 8.
The MPII should clearly state the storage requirements associated with predicted shelf life for the adhesive. Tests are conducted on anchors installed in accordance with the MPII at standard temperature.
Cure cylinders to the same environmental conditions as the test member. There can be more than one combination of these values. ACI does not make any representations with regard to health and safety issues and acl use of this document.
Visually confirm the correct location of the crack in 355.4 drilled hole prior to installing the anchor in accordance with 4. Mountain Time Zone; Region 3: Bulk adhesives mixed in open containers without automatically controlled metering and mixing of adhesive components. Eastern and Atlantic Time Zones. Why is it a Secure PDF? Customary version of this document ACI Adhesives are formulated from organic polymers, or a combination of organic polymers and inorganic materials.
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. Install and test a minimum of five anchors at each temperature data point. Adhesive anchors to resist fatigue or shock loading. The length of time the pH was less than This bond mechanism may not be reliable if the concrete temperature should rise.
This standard compares the predicted concrete breakout strength with the maximum bond strength, as based on the characteristic limiting bond stress, to determine pullout failure. Refer to hairline crack. In addition, ACI chapters provide opportunities for interaction of professionals and practitioners at a local level.
355.4M-11 Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
In spite of these efforts, the users of ACI documents occasionally find information or requirements that may be subject to more than one interpretation or may be incomplete or incorrect. The short-term temperature remains openended, however, and the response of the adhesive anchor to intermediate levels of elevated concrete temperature is established. Click here to buy this book in print or download it as a free PDF, if available.
Test anchor elements having a cross-sectional area that is less than a threaded bolt of the same nominal diameter as the anchor within five anchor diameters of the shear failure plane.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Report this value in Table All anchors in a test series shall complete the simulated seismic-tension load history.
When this step is taken, it is necessary to simulate the hole cleaning and adhesive injection processes for the full-depth hole condition by some other means. Use drilling equipment and setting procedures that are representative of normal anchor installation as 3554. by the anchor manufacturer.
The procedure used shall enable the evaluation of the installation procedure as described in Preferably, formed concrete surfaces should be used for shear testing. If the additional testing performed using Table 3. Tests are optional if test results of Test 1c can be shown to be statistically equivalent to or greater than results of Test 1a.
Where anchors are to be tested in tension, reinforcement should be placed near the surface and toward the outer edges of the member. 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.
Stop the test when splitting or steel failure prevents the torque from being increased further. In prior codes, the minimum concrete compressive strength was 14 MPa.
Greater values for spacing of reinforcement are allowed as in the case of narrow concrete components, for example: 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. These conditions may be evaluated separately for specific systems using generally accepted principles. The committees, as well as ACI as a whole, operate under a consensus format, which assures all participants the right to have their views considered.
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 rain.
Any applicable errata are included with individual documents at the time of purchase. The anchor category is established by performance of the anchor in reliability tests. Quantification of the number, order, and duration of cleaning operations and description of equipment used is required. We need your help to maintenance this website. Limitations on use based on environmental conditions in accordance with Table For concrete breakout failure, this requirement is satisfied for anchors tested in tension if the reinforcement is located outside of a virtual cone projecting from the embedded end of the anchor to the concrete surface with an internal vertex angle of degrees.
Refer to Cook and Konz for a review of factors that influence adhesive anchor behavior. They are not pass-fail tests, but rather provide the necessary input for determining the characteristic maximum bond stress for the adhesive anchor system. Following application of load to the anchor sufficient to remove any slack in the loading mechanism, begin recording the anchor displacement, and increase the tension load on the anchor to Nw as given by Eq.
The MPII should provide necessary instructions for hole cleaning with the required degree of specificity to permit evaluation of the 50 percent hole cleaning effort.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
Clean the hole with 50 percent of the specified minimum number of operations in the specified sequence, rounding down to the next whole number of operations. Where such restraint is used for example, steel cylinderdimensions of the specimen may be reduced. For each test, simultaneously record the torque at first formation of a hairline crack at one or both anchors and the maximum torque that can be applied to the anchors.