Abstract: A novel hydraulic material may reduce CO2 emissions. Such a hydraulic material may contain at least lignin, a chemical admixture, cement, an aggregate, and water, a content (unit amount) of lignin being 10 kg/m3 or more and 120 kg/m3 or less, a sulfur content of lignin being 2.5% by weight or less relative to 100% by weight of lignin. Concrete and mortar may be prepared from such a hydraulic material.

Abstract: It is an object of the present invention to provide a durability improving agent for a cement composition that improves the freezing-thawing resistance of the cement composition and also exhibits a sufficient shrinkage reducing performance as well, and a cement composition including such a durability improving agent. Specifically, the present invention provides a durability improving agent for a cement composition, characterized by comprising a hydrocarbon-based compound having an average molecular weight of 150 to 600 and a pour point of 20° C. or less as an active ingredient, and a cement composition including such durability improving agent.

Abstract: It is an object of the present invention to provide a durability improving agent for a cement composition that improves the freezing-thawing resistance of the cement composition and also exhibits a sufficient shrinkage reducing performance as well, and a cement composition including such a durability improving agent. Specifically, the present invention provides a durability improving agent for a cement composition, characterized by comprising a hydrocarbon-based compound having an average molecular weight of 150 to 600 and a pour point of 20° C. or less as an active ingredient, and a cement composition including such durability improving agent.