ASR COUNTERMEASURE METHOD AND ASR COUNTERMEASURE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a firm concrete structure in consideration of the occurrence of ASR (alkali-aggregate reaction) regarding a repair body of reinforced concrete structure durable for a long period of time while restraining ASR expansion from the outside. SOLUTION: The reinforcement ratio of an integrated ASR degraded skeleton and repair body is set to 0.85% or more in a main reinforcement direction and to 0.34% or more in an auxiliary reinforcement direction to restrain or prevent ASR expansion and degradation in the firm concrete structure with an increase of sticking area even in the ASR degraded skeleton. Alternatively, a low addition type expansion material and a contraction reducing agent are combined with cement as a repair concrete material, and the unit quantity of the low addition type expansion material is set to 20 kg/m3or more, while the contraction reducing agent is set to 2% or more of the weight of a binding agent to restrain or prevent the occurrence of a new crack hard to permit from the particularity of a construction part. COPYRIGHT: (C)2007,JPO&INPIT