低热硅酸盐水泥和粒化高炉矿渣被广泛用于制备水工混凝土。然而,低热硅酸盐水泥浆与磨碎粒化高炉矿渣的腐蚀效果及机理有待进一步探讨。本文通过评估低热硅酸盐水泥浆的质量损失,研究了磨碎的粒化高炉矿渣对钙浸出的影响。孔隙度,浸出深度,抗压强度,和维氏硬度,并与普通硅酸盐水泥浆的浸出性能进行了比较。此外,用X射线衍射分析了含粒化高炉矿渣的低热硅酸盐水泥浆的相组成和形貌,压汞测孔法,和扫描电子显微镜。结果表明,在氯化铵溶液中浸泡180天后,质量损失率,孔隙率的增长率,浸出深度,低热硅酸盐水泥浆体的抗压强度损失率为8.0%,43.6%,9.1mm,和27.7%,分别,而普通硅酸盐水泥浆的比例为7.4%,37.8%,8.4mm,和30.1%,表明低热波特兰水泥浆比普通波特兰水泥更具破坏性。添加磨碎粒化高炉矿渣可以显著提高低热硅酸盐水泥的耐浸出性。例如,添加20%磨碎的粒状高炉矿渣后,上述测试值为2.4%,28.5%,5.6mm,和20.8%,分别。原因是磨碎的粒状高炉矿渣有可能降低低热硅酸盐水泥浆的孔隙率,它还可以与其水合产物Ca(OH)2进行二次水合反应,以增强糊状结构。考虑到性价比,低热硅酸盐水泥浆的合适用量为20%左右。
Low-heat Portland cement and ground granulated blast furnace slag are widely used for the preparation of hydraulic concrete. Nevertheless, the effect and mechanism of corrosion on low-heat Portland cement paste mixed with ground granulated blast furnace slag need to be further explored. This paper investigated the impact of ground granulated blast furnace slag on the calcium leaching of low-heat Portland cement paste by evaluating its mass loss, porosity, leaching depth, compressive strength, and Vickers hardness, and comparing it with the leaching performance of ordinary Portland cement paste. Furthermore, the phase composition and morphology of low-heat Portland cement paste containing ground granulated blast furnace slag were analyzed by X-ray diffraction, mercury intrusion porosimetry, and scanning electron microscopy. The results indicate that, after 180 days of soaking in ammonium chloride solution, the mass loss rate, growth rate of porosity, leaching depth, and compressive strength loss rate of low-heat Portland cement paste were 8.0%, 43.6%, 9.1 mm, and 27.7%, respectively, while those of ordinary Portland cement paste were 7.4%, 37.8%, 8.4 mm, and 30.1%, indicating that low-heat Portland cement paste is slightly more damaging than ordinary Portland cement. The addition of ground granulated blast furnace slag could significantly improve the leaching resistance of low-heat Portland cement. For instance, after adding 20% ground granulated blast furnace slag, the above test values were 2.4%, 28.5%, 5.6 mm, and 20.8%, respectively. The reason for this is that ground granulated blast furnace slag has the potential to reduce the porosity of low-heat Portland cement paste, and it can also undergo the secondary hydration reaction with its hydration product Ca(OH)2 to enhance the paste structure. Considering the cost performance, the suitable dosage of low-heat Portland cement paste for satisfactory leaching resistance is about 20%.