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Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary

Unless otherwise noted, the installation direction is vertically down. Optional installation directions for assessment extenuation are horizontal and vertical 7. Installation temperatureThe default concrete temperature range during anchor installation is 10 to 27C. Options include installation at lower concrete temperatures 8. Embedment depth and anchor diameterThe anchor diameters and associated embedment depth range are specified by the manufacturer within the ranges permitted by this standard refer to Chapter 1.

Anchor element typeAnchor element types used in the anchorage system include different steel material types such as carbon and stainless steels, different tensile strengths of the steel, and different anchor elements such as threaded rods, reinforcing bars, and internally threaded inserts 3. Environmental use conditionsDefault conditions are dry and wet environments with service temperatures ranging from 40C to the maximum long- and shortterm service temperatures corresponding to the temperature categories given in Table 8.


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Chemical exposureThe default exposure condition is high alkalinity in a wet environment. The optional exposure condition is sulfur dioxide 8.

Concrete conditionOptions include uncracked concrete or uncracked and cracked concrete. LoadingDefault loading conditions are static loading including sustained loads. Qualification for seismic loading is optional in conjunction with qualification for cracked concrete 8. Refer to 1.


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Table 3. Note that qualification for seismic loading can only be conducted in the context of qualification for cracked concrete. The reduced test program in Table 3. For optimization of the predicted strength of anchors in cracked. Tables 3. If the additional testing performed using Table 3. 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.

Install anchors in accordance with the MPII. If the comparison does not indicate statistical equivalence in test results between carbide rotary-hammer drilling and the alternative drilling method, then the alternative drilling method must be qualified using the test requirements of 3. There are, however, two exceptions: 1 testing for shear capacity of the anchor element need not be repeated. Additional testing for shear capacity of the anchor element is not required and may be omitted Table 3. Testing using percussive drilling,. Application of torque, confined, single anchor away from edges Service-condition tests.

Test small, medium, and large diameters. Optional test. Test all diameters. Test the nominal M12 diameter or the smallest nominal diameter if it is larger than M For overhead and horizontal orientations, test the largest diameter for which recognition is sought. For tests conducted in accordance with 9. Refer to 4. Refer to 3. Alternatively, tests may be performed as confined tests. Tests are optional if test results of Test 1b can be shown to be statistically equivalent to or greater than the results of Test 1a.

If Test 7b is not performed, limit the calculated anchor. Use minimum member thickness h min for these tests. Test in concrete having a measured compressive strength of 21 3. Sensitivity to hole cleaning, dry substrate Tension, confined, single anchor away from edges. Sensitivity to hole cleaning, installation Tension, confined, single anchor away in water-saturated concrete from edges.


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Sensitivity to hole cleaning, installation Tension, confined, single anchor away from edges in a water-filled hole. Sensitivity to hole cleaning, installation Tension, confined, single anchor away from edges in submerged concrete. Sensitivity to installation in submerged Tension, confined, single anchor away from edges concrete.

Sustained tension, single anchor away from edges, residual capacity, 0. High installation tension torque or Minimum spacing and edge distance to unconfined tension two anchors near preclude splitting an edge. Tests are optional if test results of Test 1c can be shown to be statistically equivalent to or greater than results of Test 1a.

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On-Demand Course: Qualification of Post-Installed Adhesive Anchors (Part 2)

For tests conducted in accordance with Section 9. Refer to Section 3. Use minimum member thickness hmin for these tests. Test in concrete having a measured compressive strength of 21 MPa 3. Testing Test no. Sensitivity to hole cleaning, Tension, confined, single anchor away from edges installation in a water-filled hole.

Sustained tension, single anchor away from edges, residual capacity, confined test. Tension at decreased installation Tension, confined single anchor away from edges temperature. Tension, unconfined single Edge distance in corner condition anchor in corner with proximate to develop full capacity edges. High installation tension torque or unconfined tension , two anchors near an edge.

Round-robin tests for regional Tension, confined and unconfined concrete variation single anchor away from edges. Test nominal M12 diameter or smallest nominal diameter if it is larger than M For overhead and horizontal orientations, test largest diameter for which recognition is sought.

Tests are optional if test results of Test 1b can be shown to be statistically equivalent to or greater than results of Test 1a. Test is required only for anchors having cross-sectional area within five anchor diameters of the shear failure plane that is less than that of threaded bolt having same nominal diameter as anchor. Test in concrete having measured compressive strength of 21 3.

Required for anchor elements with reduced cross section; refer to Section 8.

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In cases where anchor element varies in more than one characteristic for example, material, geometry, or surface coating , test requirements indicated for each variation shall apply. For stainless steels, conduct tests as required for change in geometry. In cases where results of torque testing can show statistical equivalence to tested anchor element type, repetition of corner and minimum spacing and edge distance tests shall be permitted to be omitted. Where reference test results indicate that anchor element has statistically meaningful influence on bond stress, repeat entire test program for anchor element.

Optional tests required only if conditions of use associated with these tests are to be included for recognition. Results of additional tests performed by the manufacturer can be considered in the evaluation, only if the results are statistically equivalent to those of the ITEA. The primary testing laboratory may have specific tests performed by other qualified laboratories, but retains the overall responsibility for testing and evaluating the anchor system. Tests performed in the manufacturers laboratory shall only be considered for improvement of the statistical accuracy of a test series and must be shown to belong to the same data population by establishing statistical equivalency with test data developed by the primary laboratory or other ITEAs.

Due diligence should be exercised by the ITEA to ensure the samples are representative of production in all cases. Methods for ensuring the integrity of randomly sampled product throughout the custody chain include stamping or signing over the packaging, recording serial and batch numbers, and photographing the sampled product. After production has begun, perform identification and reference tests to verify the constituent materials have not changed and performance of the production anchors is statistically equivalent to the anchors originally evaluated.

The prototypes, however, must be produced using the production methods foreseen for the full-scale production and must be accompanied by a complete MPII. Supplemental testing of the production product to confirm validity of the prototype tests is required. The sample size may be increased at the discretion of the ITEA or manufacturer. To assess the performance of an anchor for use in concrete outside of the scope of ACI The results of these tests are assumed to be generally applicable to a wide range of concrete mixture designs with modification factors applied to the bond strength or concrete breakout strength where applicable.

On-Demand Course: Qualification of Post-Installed Adhesive Anchors (Part 2)

Where specific qualification is desired for anchors used in lightweight concrete or concrete containing cement replacements, admixtures, or other enhancements such as to support increased design values over those provided for in ACI M, the test program must be repeated using mixture designs that employ the lightweight aggregate, cement replacement, admixture, or enhancement in question. The aggregate description shall include rock and mineral components, shape, hardness, and maximum size and grading specification. Use a maximum coarse aggregate size of either Round-robin tests are required to minimize the potential impact of locally favorable or unfavorable aggregate types on the results of qualification testing.

The concrete mixture shall not include cement replacements such as slag cement, fly ash, and silica fume or limestone powder. If a concrete mixture is used for test members that do not conform to the mixture requirements listed herein, a description of the concrete mixture components and proportions shall be included in the test report. In this case, qualification will be specific to the tested concrete mixture. Use of lightweight aggregates can result in a reduction of bond strength. Where bond values in excess of those specified in ACI M, Appendix D, for adhesive anchors in lightweight concrete are required, these must be based on testing in lightweight concrete.

Tests are conducted in low- and high-strength concrete to assess whether there is a direct or inverse correlation between concrete compressive strength and bond strength for the adhesive anchor system in question. In prior codes, the minimum concrete compressive strength was 14 MPa. Testing in concrete with a compressive strength of 14 MPa may be necessary to validate the use of anchors in existing structures. The results of tests obtained in 14 MPa concrete may not be increased for use of anchors in higher concrete strengths.

Where the requirements of ASTM E conflict with this standard, the provisions of this standard shall take precedence. If the test member is cast vertically, limit the maximum height of a concrete lift to 1. Care should be exercised in vertical casting that the casting process does not result in concrete with significant strength variation due to segregation and bleeding effects, especially in the case of lower-strength concrete.

Cure cylinders to the same environmental conditions as the test member. Remove molds from cylinders concurrent with removal of forms and curing covers from the test member. The results of tests on cylinders and cores shall not be combined for the establishment of the mean compressive strength at a given concrete age. Determine mean strength test values from: a linear interpolation of a test series using the beginning and ending tests as endpoints; or b strength-age relationships developed using compression tests of concrete test members at various test ages.

The potential differences in measured compressive strength resulting from tests on cores or on cylinders should be accounted for.