WATER-RETENTIVE POROUS CONCRETE AND HEAT RESISTANT STRUCTURE

PROBLEM TO BE SOLVED: To provide a water-retentive porous concrete excellent in heat resistance which hardly causes explosive fracture or deterioration such as reduction in strength in the case where the peripheral temperature repeats high temperature and low temperature and such conditions occur over a long period.SOLUTION: There is provided a water-retentive porous concrete which comprises: a porous concrete body composed of a mixture containing portland cement, fly ash, a fine aggregate composed of igneous rock, a coarse aggregate composed of igneous rock, water and a cement dispersant; and a water-retentive cement milk existing in the continuous gaps of the porous concrete body. The fine aggregate has a maximum grain size of less than 2.5 mm, the coarse aggregate has a grain size of 2.5 mm or more in which the ratio of an aggregate having a grain size range of 5 to 15 mm is 50% or more, the amount of the fly ash is 10 to 80 mass%, the amount of the fine aggregate is 40 to 110 pts.mass and the amount of water is 35 to 45 pts.mass based on 100 pts.mass of the cement.SELECTED DRAWING: None 【課題】周辺の温度が高温と低温を繰り返し、かつ、このような状況が長期に亘る場合において、爆裂や強度低下等の劣化が起こりにくい、耐熱性に優れた保水性ポーラスコンクリートの提供。【解決手段】ポルトランドセメント、フライアッシュ、火成岩からなる細骨材、火成岩からなる粗骨材、水、及び、セメント分散剤を含む混合物からなるポーラスコンクリート本体、並びに、上記ポーラスコンクリート本体の連続空隙内に存在する保水性セメントミルクを含む保水性ポーラスコンクリート。細骨材は最大粒度が２．５ｍｍ未満であり、粗骨材は、２．５ｍｍ以上の粒度を有する骨材であり、５〜１５ｍｍの粒度範囲の骨材の割合が５０％以上であり、前記セメント１００質量部に対して、フラッシアイが１０〜８０質量％であり、細骨材が４０〜１１０質量部、水の量が３５〜４５質量部である、保水性ポーラスコンクリート【選択図】なし