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An approximation of loading rate can be determined on these machines by using a stop watch and measuring the change in load over 15-, 30-, and 60-second periods. This method of measuring load rate often requiring two people is archaic and is not verifiable.

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At higher rate of loading, the compressive strength increases. The increment is from 30% to almost 50% of the original strength. However, at lower rate of loading, the reduction in strength of concrete cube compared to its true strength is insignificant.

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The rate of loading should be 350 kg/cm 2 /minute and uniform. Test should be conducted for 3 cubes and report the average value as the test result for both 7day and 28 day compressive strength. Test should be conducted for 3 cubes and report the average value as the test result for both 7day and 28 day compressive strength.

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The closed top foldcores, D10-CT and D20-CT show a good performance under low crushing speed, the increase of crushing resistance under high loading rate leads to large increase in energy absorption. Increase in energy absorption of cube strip foldcore can be caused by the inertial effect of the structure and inertial stabilization of cell wall ...

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