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Blast furnace slag-Mg(OH)2 cements activated by sodium carbonate

机译:碳酸钠活化的高炉矿渣-Mg(OH)2水泥

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The structural evolution of a sodium carbonate activated slag cement blended with varying quantities of Mg(OH) _(2) was assessed. The main reaction products of these blended cements were a calcium-sodium aluminosilicate hydrate type gel, an Mg-Al layered double hydroxide with a hydrotalcite type structure, calcite, and a hydrous calcium aluminate phase (tentatively identified as a carbonate-containing AFm structure), in proportions which varied with Na _(2) O/slag ratios. Particles of Mg(OH) _(2) do not chemically react within these cements. Instead, Mg(OH) _(2) acts as a filler accelerating the hardening of sodium carbonate activated slags. Although increased Mg(OH) _(2) replacement reduced the compressive strength of these cements, pastes with 50 wt% Mg(OH) _(2) still reached strengths of ~21 MPa. The chemical and mechanical characteristics of sodium carbonate activated slag/Mg(OH) _(2) cements makes them a potentially suitable matrix for encapsulation of high loadings of Mg(OH) _(2) -bearing wastes such as Magnox sludge.
机译:评估了碳酸钠活化矿渣水泥与不同量的Mg(OH)_(2)混合的结构演变。这些共混水泥的主要反应产物是钙铝硅酸盐水合物型凝胶,具有水滑石型结构的Mg-Al层状双氢氧化物,方解石和含水铝酸钙相(暂定为含碳酸盐的AFm结构)。 ,其比例随Na _(2)O /炉渣比的变化而变化。 Mg(OH)_(2)的颗粒在这些胶泥中不会发生化学反应。取而代之的是,Mg(OH)_(2)充当填充剂,可加速碳酸钠活化炉渣的硬化。尽管增加的Mg(OH)_(2)替代量会降低这些水泥的抗压强度,但含50 wt%Mg(OH)_(2)的浆料仍达到约21 MPa的强度。碳酸钠活化的矿渣/ Mg(OH)_(2)水泥的化学和机械特性使其成为潜在的适合封装高负荷含Mg(OH)_(2)的废料(如Magnox污泥)的基质。

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