GROUNDING RESISTANCE REDUCING AGENT, AND GROUNDING RESISTANCE REDUCING METHOD USING IT

摘要

PURPOSE: To regulate the gelling time of a grounding resistance reducing agent to facilitate the grounding construction, and hold a stable grounding resistance value for a long period by independently force-feeding a specified slurry containing a conductive material and a slurry containing a quick hardening agent, and injecting them into the ground. ;CONSTITUTION: A quick setting and strength exhibiting slurry A in which water and an alkaline earth metal oxide such as cement or slaked lime is contained in prescribed ratios, and a quick hardening, strength exhibiting and durable slurry B to which calcium aluminate powder and sulfate powder are mixed in prescribed ratios are formed. To reduce the grounding resistance value, a conductive material such as fine powder carbon is blended to the slurry A or B in a prescribed quantity. Further, to regulate the quick gelling time, a setting retarder such as tartaric acid is added to the quick hardener according to the using state. In grounding construction, the slurries A and B are independently force-fed, mixed together just before injection into the ground, and then injected to the circumference of a grounding electrode.;COPYRIGHT: (C)1997,JPO