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Influence of Na2O Content and Ms (SiO2/Na2O) of Alkaline Activator on Workability and Setting of Alkali-Activated Slag Paste

机译:碱活化剂的Na2O含量和Ms(SiO2 / Na2O)对碱活化渣浆的可加工性和固化的影响

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摘要

The performance of alkali-activated slag (AAS) paste using activators of strong alkali components is affected by the type, composition, and dosage of the alkaline activators. Promoting the reaction of ground granulated blast furnace slag (GGBFS) by alkaline activators can produce high-strength AAS concrete, but the workability might be drastically reduced. This study is aimed to experimentally investigate the heat release, workability, and setting time of AAS pastes and the compressive strength of AAS mortars considering the Na2O content and the ratio of Na2O to SiO2 (Ms) of binary alkaline activators blended with sodium hydroxide and sodium silicate. The test results indicated that the AAS mortars exhibited a high strength of 25 MPa at 24 h, even at ambient temperature, even though the pastes with an Na2O content of ≥6% and an Ms of ≥1.0 exhibited an abrupt decrease in flowability and rapid setting.
机译:使用强碱成分活化剂的碱活化矿渣(AAS)浆料的性能受碱活化剂的类型,组成和剂量影响。通过碱活化剂促进磨碎的高炉矿渣(GGBFS)的反应可以生产高强度的AAS混凝土,但可施工性可能会大大降低。这项研究旨在通过实验研究AAS糊的放热,可加工性和凝固时间以及AAS砂浆的抗压强度,考虑到Na2O的含量以及与氢氧化钠和钠混合的二元碱性活化剂的Na2O与SiO2(Ms)的比例。硅酸盐。测试结果表明,即使Na2O含量≥6%和Ms≥1.0的浆料显示出流动性的急剧下降和快速变化,即使在环境温度下,AAS砂浆在24 h时仍具有25 MPa的高强度。设置。

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