Testing of Concrete Cores for Strength Sampling and ...We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds of metal and non-metallic ore, also can be dry grinding and wet grinding.If you are interested in our products or want to visit the nearby production site, you can click the button below to consult us.Welcome to our factory to test machine for free!
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Oct 11 2014 · Core sampling and procedure for strength determination using concrete core is discussed Testing of Concrete Cores for Strength The diameter of core specimens for the determination of concrete compressive strength should preferably be at least three times the nominal maximum size of the coarse aggregate used in the concrete and must be at least twice the maximum size of the coarse aggregate in the core sample
This test is used to determine the compressive strength of a concrete core which has usually been extracted from an existing structure The value of compressive strength can then be used in conjunction with other measured properties to assess the condition of the concrete Using a masonry saw the core is first trimmed to the correct test length which varies upon the standard being adopted
To operate simply insert the curved blades into the cut area around the core Adjust the top screw enabling the blades to grasp the core and lock the device into place by squeezing the handles Push sharply to break off the core bottom and lift the specimen out Release the lever to free the core
Core extractors are efficient and easy to use for removing drilled cores from asphalt and concrete The curved blades insert into the cut area around the core Adjust the top screw to enable the blades to grasp the core and squeeze the handles the device locks into place The lock feature protects cores from damage during extraction and assures lab acceptance for testing without repeat drilling
Jul 08 2014 · Core extraction and testing of concrete covers obtaining preparing and testing cores drilled from concrete for compressive strength test of casted concrete structures Reference Standard codes ASTM code C 42
Laboratory acceptance for testing is assured without repeat drilling Tongs are made of welded painted steel with plastic handle grips CDA15 retrieves 4in asphalt or concrete cores CDA16 retrieves 6in asphalt or concrete cores Features Eliminates repeat drilling required due to damaged samples Makes core retrieval simple in just three easy steps
Concrete in an area represented by core tests shall be considered structurally adequate if the average of three cores is equal to at least 85 percent of fc’ and if no single core is less than 75
TESTING OF CORE The core shall be placed in water at a temperature 24 o to 30 o C for 48 hours before testing Centre the core carefully on the lower platen of the machine without shock apply and increase the load continuously at constant rate with in range of 02 Nmm 2 s to 04Nmm 2 s until no greater load can be sustained Note any unusual failures and the appearance of the concrete
Core strength is also affected by core orientation relative to the horizontal plane of the concrete as placed with strength tending to be lower when measured parallel to the horizontal plane 3 These factors shall be considered in planning the locations for obtaining concrete samples and in comparing strength test
Mar 01 2014 · The inplace strength of concrete cylinder at the location from which a core test specimen was extracted can be computed using the equation 4 f cy F l d · f core where f cy is the equivalent inplace concrete cylinder strength f core is concrete core strength and F ld is the strength correction factor for aspect ratio
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