Nissan Chemical Industries Limited

Yuriko Sakaguchi

Takahiro Hori

Masamichi Obitsu

Toyoji Koinuma

Makoto Takakura

Yuji Nakamura

The invention is a method for preventing a hardened cementitious material from deteriorating or for repairing a deteriorated cementitious material, and more particularly to such method for the hardened cementitious material comprising metal materials to be corroded by a salt content and cause alkali-aggregate. It is characterized by applying a cement paste, mortar or concrete added with 1-25 weight % lithium nitride relative to the cement content so as to cover the surface of hardened cementitious material.

Method for preventing hardened cementitious material from deteriorating

An agent and method for modifying a surface layer of hardened cement structures or substrates with use of the agent which comprises in a specified ratio of an alkali silicate solution and a sodium naphthalenesulfonate-formaldehyde condensate. Said agent has an excellent stability and a remarkable permeability into the cement structure to form a deeper strengthened surface layer thereon.

Silicate containing agent and cement surface modified with said agent

Agent and method for modifying surface layer of cement structures

Growing community of inventors

Funabashi, Japan

Yuriko Sakaguchi