ACI 355.4-11 PDF
ACI M A U.S. Customary version of this document (ACI ) is available at Qualification of Post-Installed Adhesive Anchors. Click here to preview This standard prescribes testing programs and evaluation requirements forpost-installed adhesive anchors intended for use in concrete. ACI Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary. standard by American Concrete Institute, 08/01/.
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Install and cure anchors at the minimum and maximum installation temperatures for concrete and adhesive included in the MPII for downhole installation. For conditions in which torque is not applied to the anchor, the minimum edge distance is governed by the drilling process used to install the adhesive anchor.
Standard Search Industry Search. As an example, the following monitoring schedule would be acceptable: Parallel crack openings are used because they represent the most critical condition for the anchor response to loading. While the application of torque is not required to set normal adhesive anchor systems, most MPIIs specify a maximum torque value for the clamp attachment to the concrete.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
The type of brush, such as steel and nylon, and its diameter should be specified in acu MPII together with any other details, such as air pressure, that might affect the effectiveness of the holecleaning process.
Adhesive identification and expiration date. For anchors to be tested in shear, it is more important that the crack transect the anchor position at the concrete surface.
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. A limitation on the minimum embedment length of adhesive anchors is necessary to ensure conformance with the design method deemed to satisfy the anchor design requirements of ACI M, Appendix D.
Click here to preview This standard prescribes testing programs and evaluation requirements forpost-installed adhesive anchors intended for use in concrete under thedesign provisions of ACI Development of fracture surfaces that do not project to the concrete surface may preclude the attainment of maximum potential bond strength.
Record the maximum shear load or residual shear capacity and the corresponding displacement, and plot the loaddisplacement response.
Mountain Time Acii Region 3: For tests conducted in accordance with 9. Ideally, the crack runs vertically down the centerline axis of the anchor over its entire length. 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. Follow special procedures where the MPII includes them for low-temperature installation conditions.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Errata are not included for collections or sets of documents such as the ACI Collection. In general, loss of adhesion is characterized by a significant change in stiffness as reflected in an abrupt change in the slope of load-displacement curve Fig.
Temperature Category A provides a standard approach that assumes a potential long-term elevated temperature consistent with hot climate exposures and a short-term temperature reflective of diurnal cycling in such climates for a given sun exposure duration and concrete mass. The default installation condition for verification of the hole cleaning procedure is dry concrete. In this case, qualification will be specific to the tested concrete mixture.
The friction factor shall be taken as a lower-bound value. The loading punch shall act centrally on the metal element. This reliability test checks for the sensitivity of anchor bond strength to suboptimal hole cleaning effort 50 percent in dry concrete conditions. For overhead and horizontal orientations, test the largest diameter for which recognition is sought.
Load the anchor with a constant tension load Nsust,ft given by Eq. An adjustment is made for values determined through confined testing, which generally increases the measured peak load 43 over that measured in unconfined testing because confined testing restrains splitting cracks and provides for a triaxial stress state under the bearing plate.
Report any use restrictions. Other methods of preventing rotation of the washer shall be permitted, provided it can be shown they do not affect the anchor performance. 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. Criteria are provided for establishing the characteristic bond strength,reductions for adverse conditions, and the anchor category and associatedjob-site quality control requirements.
The MPII as used in the testing and evaluation of the adhesive anchor system, reproduced in full. 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. Perform tension tests at standard temperature.
355.4M-11 Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
The testing agency and evaluation agency may be separate organizations. Running opening and closing cycles serves to stabilize the bond stresses at a constant level and permits control of the crack width via application of a defined external load. Increasing cmin and smin until the requirements are fulfilled. Official interpretation of this ACI document shall be based only on the U. In the context of anchor installation, continuous special inspection is generally understood to mean that the inspector is present for each anchor installation.
Perform a minimum of five confined and five unconfined tension tests to failure on anchors in concrete produced in accordance with Mixture Design A and a minimum of five confined and five unconfined tension tests to failure in concrete produced in accordance with Mixture Design B.
Test reference 1a Chapter 6 1b Chapter 6 2a 7. 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 into account the effects of reduced spacing and edge distances. 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 acci will accept responsibility for the application of the material it contains.
Install anchors along the central axis of the concrete test members according to the MPII. These conditions may be evaluated separately for specific systems using generally accepted principles.
It is therefore necessary to perform supplemental checks for the sensitivity of the adhesive anchor system to installation in submerged concrete where the full cleaning effort in accordance with the MPII is used.
Discard the top and bottom slices.