Cracking can adversely affect the performance and service life of the repair, as cracks provide a more direct path for the ingress of deleterious elements into the repair, creating a durability concern. For structural repairs,
cracks may adversely affect the repair performance and the load-carrying capacity of the repaired structure. Additionally, cracking may be an aesthetic concern. In consideration of the aforementioned, the licensed design
professional should evaluate the cause(s) and consequences of cracks in the repair and, as needed, develop a remediation approach. If the cracks compromise the load-carrying capacity of the repaired structure, appropriate
measures should be taken. ACI 562 requires cracking mitigation to be considered in repair design.
Keywords:
cracking; cracks; durability; nonstructural repair; service life; shrinkage; structural repair.
Code:
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What is concrete “bruising,” how is it evaluated, and how can it be minimized?
Bruising refers to damage in a surface layer of remaining substrate concrete that is weakened by fine interconnected
cracks caused by the use of high-impact, mechanical methods for concrete removal and surface preparation. The bruised (or fractured) layer left by such surface preparation methods typically extends to a depth of 1/8 to 3/8 in. (3 to 10 mm) or more below the remaining substrate surface and, if not removed, generally results in lower repair bond strengths. Bruising, which can be detected through pulloff testing and petrographic examination, can be effectively minimized by selecting the most appropriate method and equipment for the given application.
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How important is the modulus of elasticity as a property of surface repair materials?
Modulus of elasticity is an important physical property of surface repair materials. For structural repairs, the modulus of elasticity of the repair materials should be similar to that of the substrate concrete, whereas in the case of nonstructural repairs, a lower modulus of elasticity may be beneficial.
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When a structural evaluation to determine capacity is to be performed, knowledge of member sizes, reinforcing details, and material properties is required. In cases where this information is not readily available through drawing document records, it needs to be obtained through in-place measurements and sampling.
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Rehabilitation projects often involve the need to increase the load-carrying capacity of members within existing concrete structures that are deficient due to increased load demand associated with change of use, deficiencies in the original design or construction, or deterioration. Such strengthening often includes increasing shear capacity.
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Article/eBook Full Name:
ASTM D6927 -22 : Standard Test Method for Marshall Stability and Flow of Asphalt Mixtures
Publish Date:
2022
Published By:
ASTM International
Related Links:
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ASTM ASTM D4829-21 : Standard Test Method for Expansion Index of Soils
Publish Date:
2021
Published By:
ASTM International
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What is the proper procedure for determining the in-place density of fresh roller-compacted concrete (RCC) according to ASTM C1040/C1040M, “Standard Test Methods for In-Place Density of Unhardened and Hardened Concrete, Including Roller Compacted Concrete, By Nuclear Methods?”
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