PROBLEM TO BE SOLVED: To provide a weed-proof material which achieves short hardening time and high initial strength development, has resistance against initial freezing damage and cracks, can reduce labor for mowing, is friendly to the environment because of low pH and little elution of a heavy metal, and shows excellent long-lasting weed-control, and a method of using the same.SOLUTION: (1) A weed-proof material includes calcium aluminate of a Blane specific surface area value of 2500 cm2/g or more and clinker aggregate having a CaO component of 10-50 mass% and an Al2O3 component of 50-90 mass%. (2) The weed-proof material according to (1) further includes at least one kind out of calcium sulfate and soil. (3) The weed-proof material according to (1) or (2) has a coarse particle rate of the clinker aggregate of 1.8-3.5. (4) The weed-proof material according to one of (1)-(3) further includes calcium silicate. (5) A method of using a weed-proof material according to one of (1)-(4) is provided.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】硬化時間が短く、初期強度発現性が高く、初期凍害・ひび割れ抵抗性を有し、草刈の労力を軽減でき、かつ低pHで重金属の溶出が少ないため環境に優しく、防草効果の持続性に優れた防草材及びその使用方法を提供する。【解決手段】(1)ブレーン比表面積値2500cm2/g以上のカルシウムアルミネート、並びに、CaO成分が10~50質量%、Al2O3成分が50~90質量%であるクリンカー骨材を含有してなる防草材、(2)さらに、石膏と土壌のうち一種以上を含有してなる(1)の防草材、(3)クリンカー骨材の粗粒率が1.8~3.5であることを特徴とする(1)又は(2)の防草材、(4)さらに、カルシウムシリケートを含有してなる(1)~(3)のいずれかの防草材、(5)(1)~(4)のいずれかの防草材の使用方法、である。【選択図】なし
