Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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45 This chapter summarizes the laboratory testing program used to investigate the effect of various parameters on the sustained load performance of adhesive anchors in concrete, the potential for using adhesive-alone testing to evaluate the sustained load performance of adhesive anchors, and the effect of early-age concrete on the short-term bond strength of adhesive anchors. The parameters considered, as well as the triage approach used to prioritize the parameters, are presented.
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46 = α α Influence Ratio ST LT If the influence ratio is greater than one, then the parameter has an influence on sustained load. Conversely, influence ratios less than one indicate that the given parameter does not have an influence on the sustained load performance.
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47 determine which parameters were believed to have the potential for the most significant impact on sustained load performance and to develop a test program to investigate those parameters. This triage approach established three categories: • High priority parameters.
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48 adhesive, (2) reduction in the adhesive bond strength due to moisture, and (3)
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49 lation causes additional curing of the adhesive, test series 10 was conducted at the manufacturer's minimum temperature and test series 11 was conducted at 110°F (43°C)
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50 Sustained load adhesive anchor chemical resistance tests were not conducted since the durability tests of ACI 355.4 are long-term tests and the reduction factor obtained from these tests, adur, was considered sufficient to account for chemical effects for both short-term and long-term loading conditions. Depth of Hole (Embedment Depth)
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Anchor Size x hef (0)
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52 Adhesive-Alone Testing Program Based on the triage approach discussed above, Table 15 presents the test matrix for the tensile creep testing program of dogbone specimens of the adhesives for series 21 and 22. Test series 21 and 22 began with short-term load tests per the tensile testing procedure presented in ASTM D638.
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53 • A 31⁄8" embedment depth for the 5⁄8" diameter bars was chosen based on minimum recommendations from AASHTO TP 84-10 to ensure adhesive failure. Test Procedure • All tests were confined tests except for test series 16, which evaluated the effect of the test setup and were unconfined tests.
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54 for the baseline tests. After testing began, it was decided to adjust the stress levels due to early failure times at 85% and 75% mean static load.
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55 disp disp Nadj cor= − δi where dispadj = displacement adjusted for strain in anchor, disp = unadjusted displacement, and N = load. δcor eA E = l where l = distance between top of concrete and coupler, Ae = effective area of anchor, and E = modulus of elasticity of anchor steel.
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56 Source: Cook and Konz (2001) Figure 37.
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57 graph for a short-term load test conducted showing the static load strength calculated by three different methods. • The ACI 355.4 procedure estimated Nadh as 11,100 lbf.
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58 8.15 -0.050 0.000 0.050 0.100 0.150 0.200 0.250 6.0 6.5 7.0 7.5 8.0 8.5 9.0 TIME (hr)
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