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When dealing with conrete the "slump" refers to how much will a sample sag, reduce in height in a given time frame. re: a 5" slump means that after removing the CYLINDER the concrete will lose 5 inches of elevation. The slump cylinder is the tool used to determine the slump of concrete.
No. Slump is "faster" but still at a very slow rate
dry concrete
Use a spectrometer to measure the wavelength of the light. There is a direct, but inverse correlation of the wavelength to the temperature.
None. A km is a measure of length whereas a square kilometre is a measure of area. There is no direct conversion between the two.