PROBLEM TO BE SOLVED: To provide a civil engineering material for use in marine areas, having a simple structure using steelmaking slag, and a suitable property for marine environmental applications, which satisfies both pH rise control of sea water and elution of components effective in growth environments of marine organisms.SOLUTION: In a civil engineering material for use in marine areas, a mixture of a steelmaking slag or a fertilizing material 1 containing a steelmaking slag, and acid soil 2, for example, red clay, is enclosed in a bag 3 with water permeability.【課題】製鋼スラグを用いた単純な構成にて、海水のｐＨ上昇抑制と海洋生物の生育環境に有効な成分の溶出を両立させる海洋環境用途に適した海域利用向け土木資材を提供する。【解決手段】製鋼スラグまたは製鋼スラグを含有する施肥材料１と酸性土壌２、例えば赤土を混合したものを透水性の袋３に封入した海域利用向け土木資材。【選択図】図２
