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. ).
|Published (Last):||13 September 2012|
|PDF File Size:||11.68 Mb|
|ePub File Size:||9.35 Mb|
|Price:||Free* [*Free Regsitration Required]|
A thermocouple inserted into the test member may be used to confirm the temperature at the time of testing. Support the test member to permit uniform tension strain distribution over the length of the test member. 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.
If the additional testing performed using Table 3. Members are encouraged to participate in committee activities that relate to their specific areas of interest.
Appendix D requires that anchors be tested either for use exclusively in uncracked concrete or for use in cracked and uncracked concrete conditions, whereby it is understood that the presence of cracking may occur at any time over the service life of the anchors. Holding cmin constant and increase smin until the requirements are fulfilled.
Adhesive anchors in aggressive environments not specifically considered in this standard.
Significant latitude is given to the engineer of record in determining the parameters of the proof load program, which will depend in large part on the type, size, and quantity of anchors being installed. Follow special procedures where the MPII includes them for low-temperature installation conditions.
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. Drill the hole downward in the submerged concrete, clean the hole in accordance with the reduced cleaning effort specified in 7. With slice tests, the sensitivity of installed anchors to different environmental exposures can be assessed.
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.
Cycling of the crack width and monitoring of the anchor displacement. The washer shall not turn during the application of torque.
Presence of water during anchor installation— Installation procedures, including hole cleaning procedures, are as specified in the MPII. These tests are optional; however, failure to assess this condition will result in restrictions on the use of the adhesive anchor system.
Looking for other ways to read this?
Fatigue is generally less of a problem for the adhesive than for the anchor element; provisions of preload in the anchor to reduce the level of stress fluctuation in the anchor element is only effective if sufficient unbonded length is provided to ensure a reasonable degree of elastic stretch. Options include installation at lower concrete temperatures 8. Please fill this form, we will try to respond as soon as possible.
System Requirements and FileOpen Plug-in download. The length of time the pH was less than Price Branko Galunic Anthony J. Sign up for email notifications and we’ll let you know about new publications in your areas of interest when they’re released.
Use of lightweight aggregates can result in a reduction of bond strength. It is important that the crack width measurement devices reflect the crack width at the anchor location.
Perform tests in accordance with 4. Any applicable errata are included with individual documents at the time of purchase. Other formats are permissible.
M Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
The plug-in limits the number of times the document may be printed to two copies. All anchors in a test series shall complete the simulated seismic-tension load history. The trend line shall be determined by calculating a least-squares fit through the data points using Eq. The applied sustained load shall not be less than 40 percent of Nsust,lt as determined in accordance with Eq.
3554 addition, ACI chapters provide opportunities for interaction of professionals and practitioners at a local level. Abbreviations Page Share. The use of a ramped loading function through the zero point of the cyclic load may be advantageous for operation of the testing apparatus. 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.
Committee activities include the development of building codes and specifications; analysis of research and development results; presentation of construction and repair techniques; and education.
355.4M-11 Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (Metric)
Additional testing for shear capacity of the anchor element is not required and may be omitted Table 3. Following completion of the simulated seismic-tension cycles, open the crack to a width not less than the crack opening width as measured at the end of the cyclic test and load the anchor in tension to failure.
For ongoing installations over an extended period, the special inspector shall make regular inspections to confirm correct handling and installation of the product. Increase the crack width by the specified crack value prior to applying external loads to the anchor. As both of these tests involve exposure to water, evaluation of the adhesive for susceptibility to hydrolyzation is included as well.
Freezing-and-thawing-resistant concrete shall be permitted. The MPII should 355.4 state the storage requirements associated with predicted shelf life for the adhesive. The use of alternate tests wci address other materials is at the discretion of the ITEA. Where such restraint is used for example, steel cylinderdimensions of the specimen may be reduced.
ACI : Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary
For more information, contact ACI. Clean the hole in accordance with the reduced cleaning effort specified in 7. Factors of particular importance in the assessment include completely filling the hole with adhesive, avoiding excessive adhesive run-out during the installation process, and preventing anchor element sag during adhesive cure.