STABILITY AGAINST TEMPERATURE AND ENVIRONMENT FOR GROUND-RESISTANCE REDUCING MATERIAL USING WATER-ABSORBENT POLYMER

As the number of communication facilities increases, the number of gro undings installed in such stations also increases. It is difficult to achieve the specified ground-resistance value in such high ground-resi stance regions as volcanic ashes, sands, and rocks. In this paper, as a ground-resistance reducing material, a water-absorbent material soli dified by plastic hardener is treated. Its stability in an air and wat er environment is described. As a water-absorbing material, anhydrous maleic acid polymers are selected. It is found that this material main tains the characteristics for about 10 years if the performance degrad ation of 20 percent is allowed and about 20 years if 50 percent is all owed. For the reducing material made of an absorbing material solidifi ed by epoxy, it is found from the environmental degradation characteri stics by changing the temperature in air that the dry condition can be allowed for about one year during which the ground resistance can mai ntain its initial value if rain falls and is sufficiently stable. Furt her, from the environmental degradation characteristics in water, it i s found that the ground resistance maintains the initial value and the compression strength is not degraded unless the temperature is more t han 70 degrees C. Hence, the stability is sufficient even in water.