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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Where preheating of avi cartridges to reduce viscosity and facilitate adhesive flow is specified in the MPII, observations should be made to determine zci this results in retarded cure, lowering of the glass-transition temperature, and impaired resistance to creep.
They are delivered with a bulk dispensing machine whereby metering and mixing of the components are automatically controlled during dispensing through a metering manifold and disposable mixing nozzle. The anchors are allowed to cure for the minimum curing time. The anchor shall not turn in the anchor hole prior to reaching a torque resistance of 1. Other table configurations are permissible.
Outdoor implies exposure to weather such as water, temperature, and aggressive environments, while indoor is associated with a less demanding set of parameters. For overhead and horizontal orientations, test largest diameter for which recognition is sought.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
These tests are not intended to simulate all possible loading conditions that may occur in an earthquake or intended to represent the degree of cracking that might occur in plastic hinge regions of reinforced concrete structures. Capsule diameter corresponds approximately to nominal anchor diameter.
The hole in the confining plate shall be 1. Use drilling equipment and setting procedures that are representative of normal anchor installation as specified by the anchor manufacturer.
Testing and assessment 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. 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.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Position such reinforcement so that the capacity of the tested anchor is not affected. 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. Install anchors in accordance with the MPII. Reference tests to obtain baseline values for the evaluation of reliability and service-condition test results Chapter 6 3.
There is no limit to the number of times a document may be viewed on your computer. The onset of uncontrolled slip is therefore defined as loss of adhesion and the xci corresponding to loss of adhesion is denoted as Nadh. Where this condition is not satisfied, the product shall be reported as unqualified.
Crack closing is accomplished with the embedded reinforcement and may be influenced by slippage of the anchor in the crack. The three additional independent laboratories shall be selected by the primary testing laboratory and accredited for testing of anchors according to ASTM E A companion specification in inch-pound units is also available. The frequency of monitoring displacements shall be chosen to demonstrate the anchor characteristics. Adhesives to adhere structural elements to concrete surfaces outside of a drilled hole.
All test members shall originate from the same concrete batch. Limit injection depth to the bottom block B Fig. The residual crack width 9 associated with a closed crack may be influenced by the presence of anchors installed in the crack path and by the crack width cycling history of the test member. 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.
Round-robin tests followed extensive, but inconclusive, investigations to determine the precise nature of concrete composition influence on adhesive anchor performance. Alternatively, it shall be permitted to correlate the chamber temperature with the test member 33 Table 8.
Use a sampling frequency appropriate for the load or strain rate employed for the test. Apply a tension preload not exceeding 5 percent of 31 Nsust,lt or N to the anchor prior to zeroing displacement readings. Typical sources of elevated concrete temperature are anticipated, with the exception of heat of hydration in earlyage concrete, extreme elevated temperature for example, boiler roomsand exposure to nuclear radiation in containment structure.
If the adhesive material is changed by the manufacturer, that change may or may not significantly affect the published performance of the anchor system.
The use of a ramped loading function aic the zero point of the cyclic load may be advantageous for operation of the testing apparatus.
Support the test member to permit uniform tension strain distribution over the length of the test member. Tests on adhesive anchors shall be confined tension tests.
Freezing-and-thawing-resistant concrete shall be permitted. The minimum member thickness hmin shall not be less than the value given by Eq. Where such restraint is used for example, steel cylinderdimensions of the specimen may be reduced.
Round-robin tests are required to minimize the potential impact of locally favorable or unfavorable aggregate types on the results of qualification testing. This bond mechanism may not be reliable if the concrete temperature should rise.
ACI does not make any representations with regard to health and safety issues and the use of this document. Testing in conformance with round-robin testing requirements may result in significant scatter and adjustment of the characteristic bond stress from round-robin testing should be limited to cases where there is a clear trend.
Limited experimental evidence indicates these effects may lessen as the concrete age increases. Parallel crack openings are used because they represent the most critical condition for the anchor response to loading.
Many adhesive anchor systems exhibit concrete breakout failure when tested in tension at minimum embedment. This standard also applies to anchors with an anchor embedment depth hef not less than four diameters 4daor 41 mm, and an embedment depth not exceeding 20da.
It is therefore necessary to perform supplemental checks for the sensitivity of the adhesive anchor system to installation in water-filled holes where the full cleaning effort in accordance with the MPII is used. Test results shall be shown statistically equivalent to those of the originally tested product.
Confined tests do not generate large spall cones, and as such serve to reduce the volume of concrete required for the test program.
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Adhesive anchors may exhibit concrete breakout failure before attainment of the maximum bond stress achievable for the adhesive in question. The centerline-tocenterline distance between any crack control reinforcement and the anchor shall not be less than 0.
Jump up to the previous page or down 35.4 the next one. Holding smin constant and increase cmin until the requirements are fulfilled. It is not intended that anchors should be installed 355.44 a six-degree tilt as a means of enhancing resistance to tension loads.