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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Anchor element type, material, diameter, and length. The use of a clear polycarbonate tube to simulate blind injection conditions, as shown in Fig. ACI does not make any representations with regard to health and safety issues and the use of this document.
The trend line shall be determined by calculating a least-squares fit through the data points using Eq. Development of fracture surfaces that do not project to the concrete surface may preclude the attainment of maximum potential bond strength.
The load Nadh shall be taken from the point of intersection between the projected line and the measured loaddisplacement curve Fig. Products may be tested and assessed for either or both categories under this standard. 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.
355.4M-11 Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
The default installation condition for verification of the hole cleaning procedure is dry concrete. Use drilling equipment and setting procedures that are representative of normal anchor installation as specified by the anchor manufacturer. For a listing of and access to all product errata, visit the Errata page. Record the concrete test member temperature at maximum 1-hour intervals. Qualification for seismic loading shall only be considered in the context of a cracked concrete test program 535.4 given in Table 3.
Loading—Default loading avi are static loading including sustained loads. As an example, the following monitoring schedule would be acceptable: Apply a tension preload not exceeding 5 percent of 31 Nsust,lt or N to the anchor prior to zeroing displacement readings.
Anchors are permitted to be installed in concrete that is cracked and may be expected to crack during the service life of the anchor.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Use a sampling frequency appropriate for the load or strain rate employed for the test. Such equipment is considered part of the adhesive anchor system. In these cases, it is necessary to increase the embedment to a point where bond failure occurs. For tests in sulfur dioxide, fabricate the anchor element from austenitic stainless steel.
If tests at the long-term test temperature are performed with Nsust 355.4 accordance with Eq. If no torque is specified by the MPII, finger-tighten the anchor prior to testing.
Quantification of the number, order, and duration of cleaning operations and description of equipment used is required. The drilling action during setting of spin-set capsule anchors is critical to the correct mixing and curing of adhesive. Reference tests for the assessment of tests conducted in cracked concrete shall be performed zci cracked concrete. Criteria are ac prescribed to determine the suitability of adhesive anchors used in uncracked concrete only, or in both cracked and uncracked concrete.
Visually verify the positioning of the anchor in the crack in accordance with 4. Test reference 1a Chapter 6 1b Chapter 6 2a 7.
Please help us to share our service with your friends. Central Time Zone; and Region 4: Appendix A – ACI Unless otherwise noted, the installation direction is vertically down. 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 special inspector shall verify the initial installations of each type and size of adhesive anchor by construction personnel on site in accordance with For anchor systems evaluated using the reduced test program of Table 3. Aggregates shall be in accordance with 4. There can be more than one combination of these values. Heat-treatment may also be used to increase the rod strength.
For a discussion of issues associated with the qualification and design of systems for post-installed reinforcing bars, refer to Spieth et al. Install and cure anchors at the minimum and maximum installation temperatures for concrete and adhesive included in the MPII for downhole installation. Determine mean strength test values from: Where anchors are to be tested in tension, reinforcement should be placed near the surface and toward the outer edges of the member.
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Clean the hole in accordance with the reduced cleaning effort specified in 7. Subsequent installations of the same anchor type and size by the same construction personnel shall be permitted to be performed in the absence of the special inspector.
Login or Register to save! Stop the test when splitting or steel failure prevents the torque from being increased further.