Cement core sample Sulfur Concrete Capping apparatus Compressive Strength Testing
Application:
Capping is the preparation of the ends of cylindrical concrete specimens to ensure that a test cylinder or core has smooth,
parallel, uniform bearing surfaces that are perpendicular to the applied axial load during compressive strength testing.
Importance of Capping
Prior to performing compressive strength tests on cylindrical concrete specimens, it’s important to understand both of the most popular options for preparing the cylinder ends. Proper end preparation ensures that the ends of concrete test cylinders or cores have smooth, parallel bearing surfaces perpendicular to the applied axial load to assure uniform distribution of forces during testing. ASTM C617 is a method using molten sulfur mortar to form bonded caps. ASTM C1231 specifies the procedure to use unbonded neoprene pads in metal retaining rings. No matter which method you choose, specific criteria should comply with ASTM C39 specifications for planeness and perpendicularity of specimens. Be sure to scroll down below the infographic for a brief overview of each method as well as necessary equipment.
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Sulfur Mortar Capping
Overview:
Capping of concrete cylinders and drilled concrete cores with sulfur mortar or other capping compounds prepares specimens for compressive strength testing. Specifically, this procedure provides plane surfaces perpendicular to the specimen axis to evenly distribute loading forces. As noted in ASTM C617, sulfur mortar may be used to test specimens with greater compressive strengths than its own with user verification. When using this method, it’s important to periodically check for voids by tapping hardened caps with the edge of a coin and listening. Capped cylinders must cure for at least two hours prior to testing or for 16 hours if design strength is 5,000psi (35MPa) or greate
Technical reference:
Core Size | 100mm /150mm |
Product Material | steel |
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