Adhesive Anchors in Concrete Under Sustained Loading Conditions (2009) / Chapter Skim
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A-1 A P P E N D I X A Draft AASHTO Test Method -- Standard Method of Test for Evaluation of Adhesive Anchors in Concrete Under Sustained Loading Conditions
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A-3 OTHSAA1-XXXXT Standard Method of Test for Evaluation of Adhesive Anchors in Concrete Under Sustained Loading Conditions AASHTO Designation: T XXXX-XX ASTM Designation: XXXX-XX INTRODUCTION Adhesive anchor systems have widespread use in transportation structures such as bridge widening, concrete repair and rehabilitation, barrier retrofitting, utility installation on existing structures, and tunneling. These systems are used to anchor threaded rod and reinforcing bars in concrete.
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A-4 OTHSAA2-XXXXT D 2990, Standard Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics E 488, Standard Test Methods for Strength of Anchors in Concrete and Masonry Elements E 1512, Standard Test Methods for Testing Bond Performance of Bonded Anchors 2.2 Other Standards: ICC-ES AC308, Acceptance Criteria for Post-Installed Adhesive Anchors in Concrete 3 TERMINOLOGY 3.1 Refer to ASTM D 907 for a complete listing of terminology related to adhesives. 3.2 Adhesive anchor – a post-installed anchor that transfers load to concrete through an adhesive compound embedded in a hole in hardened concrete.
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A-5 OTHSAA3-XXXXT 4.6 Means for comparing adhesive anchor products for sustained loading applications. 4.7 The test methods in this standard should be followed in order to ensure reproducibility of test results.
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A-6 OTHSAA4-XXXXT Figure 1: Static Load Test Apparatus (Source: modified from Cook et al.
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A-7 OTHSAA5-XXXXT 5.2.2 The test apparatus must be of sufficient capacity so as to not yield during testing. 5.2.3 Coupler: A coupler shall be used between the anchor and the test loading rod providing a non-rigid connection which does not transfer bending forces.
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A-8 OTHSAA6-XXXXT 6.3.9 Test concrete compressive strength in accordance with ASTM C 39 for concrete cylinders or ASTM C 42 for concrete cores. Concrete strength at any point can be determined from a concrete strength-age relationship curve constructed from a sufficient number of compression tests conducted at regular intervals.
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A-9 OTHSAA7-XXXXT 8 SPECIMEN CONDITIONING 8.1 Begin conditioning of the test slabs to their final environmental condition upon completion of the manufacturer's specified curing time, and within 7 ±5 days. 8.2 Do not begin tests until the temperature and humidity of the test specimens have stabilized for at least 24 hours.
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A-10 OTHSAA8-XXXXT 9.3.3.6 The amount of pre-tensioning to the apparatus during test setup shall be uniform for all samples. 9.3.4 Loading: 9.3.4.1 Initial Load – Apply an initial load not exceeding 5% of the estimated ultimate load capacity of the anchor system in order to bring all members of the test apparatus into bearing.
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A-11 OTHSAA9-XXXXT 9.4.4.1 Ensure that the test apparatus and instrumentation complies with the requirements of section 5 of this test method. 9.4.4.2 Ensure that the test apparatus is centered over the anchor and that the force applied is acting through the center of the anchor and perpendicular to the structural member.
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A-12 OTHSAA01-XXXXT 10.5 Normalize the load levels for the sustained load (creep) test to a percent of the mean static load from the static load tests.
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A-13 OTHSAA11-XXXXT 11.1.13.2 Individual load values and percent mean static load values at failure per anchor. 11.1.13.3 Individual displacement values at failure per anchor.
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A-14 OTHSAA21-XXXXT 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 0.000 0.010 0.020 0.030 0.040 0.050 0.060 0.070 0.080 0.090 0.100 DISPLACEMENT (in)
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A-15 OTHSAA31-XXXXT Figure 4: Typical Strength-controlled Failure (Source: Cook and Konz [14.1]
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A-16 OTHSAA41-XXXXT Figure 6: Typical Displacement-controlled Failure (Source: Cook and Konz [14.1]
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A-17 OTHSAA51-XXXXT X3.2.2 The change in slopes between the given point and the following data point is plotted and examined over the region just prior to rupture. It is suggested that this examination be conducted on a normal graph (not log time)
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A-18 OTHSAA61-XXXXT 0% 20% 40% 60% 80% 100% 120% 0.01 0.1 1 10 100 1000 10000 100000 1000000 10000000 TIME (hr)
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A-19 OTHSAA71-XXXXT Figure 10: Suggested Load Transfer for Sustained Load (Creep) Tests (Source: modified from Cook et al.
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