| 摘要 |
<p>PROBLEM TO BE SOLVED: To research new standards necessary for securing frost damage resistance of AE concrete, instead of cell interval factors, and provide AE concrete having frost damage resistance reliably by meeting the new standards.SOLUTION: In AE concrete having frost damage resistance, the ratio of the number of cells of cell chord lengths of 50-100μm to the total number of cells of cell chord lengths of 1μm or longer in hardened concrete is 20% or higher, and the ratio of the number of cells of cell chord lengths of 1-30μm to the total number of cells of cell chord lengths of 1μm or longer in the hardened concrete is lower than 20%.</p> |
