ACI Adhesive Anchor Installer Certification Practice Exam

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What is the required minimum concrete age for the installation of adhesive anchors according to ACI 318-11?

14 days
21 days
28 days
30 days

The correct answer is: 21 days

The required minimum concrete age for the installation of adhesive anchors according to ACI 318-11 is specified to ensure that the concrete has reached adequate strength and hydration levels before any additional loads are applied through anchors. Waiting for a minimum of 21 days allows the concrete to properly cure and develop the necessary compressive strength, which is essential for the performance and reliability of adhesive anchor systems. During this curing period, moisture levels within the concrete can stabilize, reducing the risk of issues such as bond failure caused by insufficient hydration or stress concentrations. This time frame aligns with common industry practices and recommendations for ensuring structural integrity. The emphasis on curing time reflects the understanding that adhesive anchors rely heavily on the bond between the adhesive and the concrete substrate.