| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement additive which can exert a water-reducing capacity better than that of cement additives using lignin distributed as a commercial item.SOLUTION: A cement additive contains a lignin modified product having lignin sites and (poly)alkylene glycol sites, and the lignin modified product has a structure in which lignin sites are bonded directly (poly)alkylene glycol sites. |
