This research aimed to create value of construction and demolition waste to be able used as a recycled coarse aggregate (RCA) in durable concrete, based on 7-year field investigation in marine site. Fly ash was used to substitute Portland cement type I in RCA concrete varied from 0 to 50% by weight of binder with three W/B ratios and comparing to natural aggregate (NA) concrete. Cubical concrete specimens were cast having round steel bars embedded with various concrete coverings to evaluate the durability performances. After 28-day curing, the specimens were placed at a tidal zone in the gulf of Thailand and investigated both mechanical and durability performances at 7-year exposed period. Based on site monitoring, 15–25% fly ash RCA concrete with W/B ratio of 0.40 would be advantaged to resist destruction due to the marine attack when compared with NA concrete with the same water-to-binder ratio.

这项研究旨在创造建筑和拆除废物的价值，使其能够在耐用混凝土中用作再生粗骨料 (RCA)，基于对海洋场地 7 年的实地调查。飞灰用于替代 RCA 混凝土中的 I 型波特兰水泥，其粘合剂重量为 0% 至 50%，具有三种 W/B 比，并与天然骨料 (NA) 混凝土进行比较。用圆形钢筋嵌入各种混凝土覆盖物来铸造立方混凝土试件，以评估耐久性性能。固化 28 天后，将试样放置在泰国湾的潮汐带，并在 7 年的暴露期间研究机械和耐久性性能。根据现场监测，15-25% 粉煤灰 RCA 混凝土，W/B 比为 0。