含粉煤灰或矿渣与硅灰的不同组合的混凝土(英文)

Concrete Containing Different Combinations ofFly Ash or Slag with Silica Fume

本研究评价了在高性能混凝土中掺加粉煤灰－硅灰或磨细矿渣－硅灰的不同组合时的抗压强度、劈拉强度和氯离子渗透性。在水胶比０．２８～０．３３、总胶凝材料用量５００～５５０ｋｇ／ｍ３下，采用这两种矿物掺和料组合替代３０％～５０％的硅酸盐水泥时，混凝土２８ｄ抗压强度大多为８５～１００ＭＰａ，２８ｄ劈拉强度大多为５．５～６．５ＭＰａ，并具有高工作性和很低的氯离子渗透性；混凝土的早期强度发展快，而且后期强度持续增长。含粉煤灰－硅灰或矿渣－硅灰的不同组合的混凝土的劈拉强度与抗压强度的比值为０．０６３～０．０６６。不存在一个对于抗压强度和劈拉强度都是最佳的掺和料组合。

This study evaluates the compressive strength,split tensile strength and chloride permeability of various combinations of fly ash and silica fume or granulated blast furnace slag and silica fume in highperformance concrete.It was determined that when these two combinations of mineral admixutres were used to replace 30 to 50 percent of Portland cement at waterbinder ratio of 0.28 to 0.33 and total binder content of 500 to 550 kg/m3,concretes can be produced with 28d compressive strength mostly between 85 to 100 MPa,28d split tensile strength mostly between 5.5 to 6.5 MPa,high workability,and very low chloride permeability.The concretes exhibited both a quick strength development at early age and a sustaining development later.The ratio of split tensile strength to compressive strength of concretes containing different combinations of FA and SF or GBS and SF were 0.063 to 0066.No optimum combination of blending materials existed for both compressive and split tensile strengths.