| abstract |
Disclosed is a durable cement-based material having enhanced resistance to Ca elution, salt damage, scaling, and freeze-thawing. A cured product of kneaded material containing 8 to 70 parts by mass of γ belite with respect to 100 parts by mass of cement, having a densified layer on a surface layer part, and a porosity K 1 and a density of the densified layer Surface densified mortar or concrete in which the ratio K 1 / K 2 of the internal porosity K 2 excluding the densified layer is 0.8 or less. Or the hardened | cured material of the cement kneaded material containing the 1 type (s) or 2 or more types of (gamma belite), (alpha) wollastonite, and calcium magnesium silicate, Comprising: The surface layer densified mortar or concrete which carbonized the surface layer part after hardening. The thickness of the densified layer is, for example, 0.5 to 10 mm. [Selection figure] None |