| 摘要 |
PROBLEM TO BE SOLVED: To provide a porosity measuring method with which porosity of a fine void of a cement hardened body can be measured accurately, and a sample for measurement is available effectively.SOLUTION: A porosity measuring method includes: a first grinding step for grinding a surface of a cement hardened body; a filling step for filling the inside of a void opened on the ground surface of the cement hardened body with carbon containing fillers where the total content of any other elements than carbon, oxygen, hydrogen and nitrogen is 0.1 mass% or less and the content of carbon is 20 mass% or more; a hardening step for hardening the carbon containing fillers with which the inside of the void is filled; a second grinding step for grinding the surface of the cement hardened body with which the carbon containing fillers are hardened; a measuring step for dividing the surface of the cement hardened body ground in the second grinding step into a plurality of small blocks, irradiating the surface with electron beams, and measuring the concentration of carbon in each of the small blocks in accordance with a signal generated from the surface; a determination step for determining a small block in which the carbon concentration is equal to or more than a predetermined value, as a void; and a calculation step for counting the number of small blocks determined as the void in the determination step, and calculating a ratio of the number of small blocks determined as the void in the number of all the small blocks as porosity. |
