ASRによる損傷に及ぼす鉄筋拘束の影響に関する研究
1994 年 43 巻 491 号 p. 970-975
詳細
1994 年 43 巻 491 号 p. 970-975
In reinforced concrete structures, the degree of deterioration due to an alkali aggregate reaction is influenced by the amount of reinforcement in the concrete, because the reinforcement restrains the expansion due to the alkali aggregate reaction. To investigate the effect of reinforcement steel on the deterioration of concrete, experimental works were made using concrete prism specimens with various amounts of steel reinforcement. Expansion and crack patterns were measured for 2 years. And the compression tests of the concrete prism specimens were caried out after 5 year's storage. Compressive strength, stress-strain relationship and Young's modulus were measured for each specimen. At the same time, acoustic emission characteristics of each specimen during compressive loading were investigated.
The test results show that the deterioration of concrete due to the alkali aggregate reaction decreased extremely when the steel reinforcement ratio was more than 0.71%. One of the reasons is considered that the growth of cracks is restricted by the chemical prestress induced in the concrete with the expansion of concrete due to the alkali aggregate reaction, resulting the decrease of water supply to the inner part of concrete.
