HARDENED CEMENT BODY AND PRECAST CONCRETE PLATE

• Main Authors: KISHIRA RYO, KONO KATSUYA, MIZOGUCHI MANAMI
• Format: Patent
• Language: English; Japanese
• Published: 05.04.2023
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

To provide a cement composition excellent in abrasion resistance with flowability suitable for construction.SOLUTION: A hardened body of a cement composition comprises at least a cement, a silica fume, inorganic powder, a fine aggregate, hard sand, a high-performance water reducer, a defoamant, and water. Compressive strength thereof is 300 N/mm2 or more; a maximum grain size of the fine aggregate is 1.2 mm or less; hardness of the hard sand is higher than that of the fine aggregate; in a grain size of the hard sand, a 10% weight cumulative grain size is 1.2 mm or more, and a 90% weight cumulative grain size is 5.0 mm or less; and a content ratio of the hard sand to the total amount of the fine aggregate and hard sand is 30% or more and 70% or less.SELECTED DRAWING: Figure 1 【課題】耐摩耗性に優れるだけでなく、セメント組成物が施工に適した流動性を有する。【解決手段】セメント、シリカフューム、無機粉末、細骨材、硬質砂、高性能減水剤、消泡剤、および水を少なくとも含むセメント組成物の硬化体であって、圧縮強度が３００Ｎ／ｍｍ２以上であり、前記細骨材の最大粒径が１．２ｍｍ以下であり、前記硬質砂の硬度が前記細骨材の硬度よりも高く、前記硬質砂の粒径は、１０％重量累積粒径が１．２ｍｍ以上、９０％重量累積粒径が５．０ｍｍ以下であり、前記細骨材と前記硬質砂の全量に対する前記硬質砂の含有割合が３０％以上７０％以下であることを特徴とする。【選択図】図１