25年経過した実大鉄筋コンクリート壁体における普通および流動化コンクリートの構造体強度に関する研究

概要

論文の詳細を見る
Although the technical papers on strengths and durability of concrete are abundant, those concerning long term strength and carbonation of concrete in structure are limited. This paper presents the results of a series of long term field experiment conducted for 25 years. Six reinforced concrete model walls, made of ordinary concrete with the slump of 12, 15, 18, 21cm and flowing concrete with slump of 21cm superplasticized with the initial slump of 8 and 12cm, were tested for compressive strength, modulus of elasticity on core specimens and rebound number on wall surface at the ages of 28 days, 91 days, 1 year, 4.5 years, 15 years and 25 years. The test results indicated that compressive strength, tested on drilled core specimens, increased with age up to 4.5 years, however, did not increase between 4.5, 15 and 25 years. Elastic modulus was showed slight increase with age up to 1 year, and showed practically no change up to 15 and 25 years. Rebound number by rebound test hummer increased with age up to 1 year, but did not increased with age up to 25 years, which suggests that the correlation value on estimated strength with rebound test hammer, such as 40% reduction at 10 years, would make over correlation.
社団法人日本建築学会の論文
2007-02-28