The additive for the excavation mud water and the excavation mud water null 2 -

摘要

As for this invention, as the filtered water quantity is decreased in regard to the excavation mud water which is used for the excavation of the subterranean continual wall and the fundamental post etc in engineering works constructing, it is the excavation mud water which contains the additive and the said additive where for the excavation mud water cohesion sinkage characteristic is improved, is superior in efficiency such as mud water stability. In detail, 2- acrylamide -2- isobutane sulfonic acid and/or that salt and acrylic acid and/or polymerizing the monomer blend which designates that salt as the necessary component, it is the excavation mud water which contains the additive, and the said additive which for the excavation mud water jointly use the water soluble copolymer of the high-molecular quantity which can and the water soluble copolymer of the low molecular weight.