Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures
Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures
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DOI：
10.3390/min8050174
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发表时间：
2018-05-01
期刊：
影响因子：
2.5
通讯作者：
Sato, Tsutomu
中科院分区：
文献类型：
--
作者：
Toda, Kanako;Sato, Haruna;Sato, Tsutomu
部分钢铁厂的钢渣和海洋和海滨工程的疏浚土部分作为废物处理。然而，这两种废物的混合物有可能在混合时用作建筑材料，因为化学反应形成了第二阶段。将此类废物作为资源加以利用，将有助于通过减少废物和取代水泥等原始资源来提高社会的可持续性。最近，据报道，钢渣和疏浚土的混合物在特定条件下硬化。疏浚土和钢渣的相组成因各组分的含量不同而不同，这导致混合料的强度发展不可预测。钢渣和疏浚土成分的变化对混合物强度发展的影响尚不清楚，限制了这两种材料的利用。了解混合料的硬化机制将能够预测强度发展。专注于钢渣，特别是疏浚土中的成分的变化，本研究的目的是确定这两种材料中的成分，影响第二相的形成，负责强度的发展。我们发现支持的建议，硅酸钙水合物，C-S-H，是负责的强度发展的混合物的第二相之一。通过对两种钢渣和不同疏浚土的比较，提出钢渣中的硅酸盐含量和疏浚土中的无定形二氧化硅含量是参与C-S-H形成的起始原料的关键组分。
Some of the steel slag from ironworks and dredged soils from marine and waterfront engineering work are partially treated as waste. However, a mixture of these two kinds of waste has the potential to be used as construction materials when mixed, due to chemical reactions forming secondary phases. Utilizing waste of such kind as a resource will help to improve sustainability in society by reducing waste and replacing virgin resources such as cement. Recently, it was reported that mixtures of steel slag and dredged soil hardens under specific conditions. The phase compositions of dredged soils and steel slags vary depending on the quantity of each component, which results in unpredictable strength development of mixtures. The effect of the variations in the components of steel slags and dredged soils on strength development of the mixtures is not yet clear, limiting the utilization of both materials. Understanding the hardening mechanisms of the mixtures will enable the prediction of strength development. Focusing on the variations in the components in steel slags and, especially of dredged soils, this study aims to identify the components in both materials that affect the secondary phase formation that are responsible for strength development. We found support for suggestions that calcium silicate hydrate, C-S-H, is one of the secondary phases responsible for the strength development of the mixtures. From a comparison of two kinds of steel slags and various dredged soils, the amount of portlandite in the steel slags and the amount of amorphous silica in the dredged soils are suggested as a couple of the key components of starting materials involved in the C-S-H formation.