scholarly journals Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5450
Author(s):  
Kanako Toda ◽  
Ryosuke Kikuchi ◽  
Tsubasa Otake ◽  
Satoshi Nishimura ◽  
Yuzoh Akashi ◽  
...  
Keyword(s):  
Humic Acid ◽  
Steel Slag ◽  
Construction Materials ◽  
Engineering Application ◽  
Pozzolanic Reaction ◽  
Strength Development ◽  
Organic Matters ◽  
Development Indicators ◽  
Dredged Soil ◽  
Accelerate Evaluation

Dredged soils have been used as construction materials by alkaline activation with steel slag (steel slag-dredged soil mixtures) at harbors. Such mixtures develop strength chiefly by calcium silicate hydrate (C-S-H) formation by the pozzolanic reaction. However, the strength of such mixtures is unpredictable, and in some cases, mixtures have been too soft for the intended engineering application. An identification of strength development indicators would accelerate evaluation processes for strength development to facilitate and promote the utilization of such materials. This paper focuses on the relationship between the characteristics of soil organic matters in dredged soils and the strength development of the mixtures by a comparison of eight dredged soils collected from eight different Japanese harbors. The characteristics of the soil organic matters were identified to determine as indicators of mixtures with weak strength development, i.e., enriched sulfur content in extracted soil organic matter (humic acid) fraction, and the N/C ratio of humic acid similar to land humic acid standards. Increases in the validated fraction of dredged soils and steel slag by replacing fractions disadvantageous to construction resources would contribute to reduce waste production, which would lower the environmental impact of the use, aiming to achieve sustainable utilization of such materials.

scholarly journals Correction: Toda, K., et al. Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures. Minerals 2018, 8(5), 174

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 473
Author(s):  
Kanako Toda ◽  
Haruna Sato ◽  
Nilan Weerakoon ◽  
Tsubasa Otake ◽  
Satoshi Nishimura ◽  
...  
Keyword(s):  
Steel Slag ◽  
Strength Development ◽  
Key Factors ◽  
Factors Affecting ◽  
Dredged Soil ◽  
Soil Mixtures

The authors wish to make the following corrections to this paper [...]

scholarly journals Effects of the properties of the materials on the strength development of steel slag-dredged soil mixtures

2021 ◽  
Vol 16 (3) ◽  
pp. 179-190
Author(s):  
Yuzo AKASHI ◽  
Yousuke YAMAGOSHI ◽  
Takeshi KOKADO ◽  
Kanako TODA ◽  
Takeshi KATSUMI
Keyword(s):  
Steel Slag ◽  
Strength Development ◽  
Dredged Soil ◽  
Soil Mixtures

scholarly journals The Role of Various Powders during the Hydration Process of Cement-Based Materials

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Shuhua Liu ◽  
Hongling Wang ◽  
Jianpeng Wei
Keyword(s):  
Early Stage ◽  
Steel Slag ◽  
Pozzolanic Reaction ◽  
Hydration Process ◽  
Limestone Powder ◽  
Strength Development ◽  
Early Hydration ◽  
Cement Based Materials ◽  
Early Strength

The role of various powders including glass powder (GP), limestone powder (LP), and steel slag powder (SSP) during the hydration process of cement-based materials was investigated by using X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and strength tests. GP has adverse impact on early strength, but the pozzolanic reaction at later stage enhances the strength development greatly. LP can significantly improve early strength. SSP has a good contribution to the early and later strength of the paste when its content is less than 15%. GP has little effect on the kind of hydration products but relatively large effects on the quantity. Calcium hydroxide (CH) content of GP paste decreases over curing age gradually, which is different from pure cement paste because its pozzolanic activity consumes more CH than that generated from the cement hydration. SSP and LP mainly play a role of filling effect at early stage. Nucleating effect of LP also promotes the early hydration of cement. The hydration of LP occurs at later stage and forms the calcium carboaluminate hydrates. The hydration of SSP is relatively slow, which generates CH at later stage and is effective in the strength development.

scholarly journals Key Factors Affecting Strength Development of Steel Slag-Dredged Soil Mixtures

Minerals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 174 ◽  
Author(s):  
Kanako Toda ◽  
Haruna Sato ◽  
Nilan Weerakoon ◽  
Tsubasa Otake ◽  
Satoshi Nishimura ◽  
...  
Keyword(s):  
Steel Slag ◽  
Strength Development ◽  
Key Factors ◽  
Factors Affecting ◽  
Dredged Soil ◽  
Soil Mixtures

An overview on the activation of reactivity of natural pozzolans

2001 ◽  
Vol 28 (5) ◽  
pp. 778-786 ◽  
Author(s):  
Caijun Shi
Keyword(s):  
Chemical Activation ◽  
Setting Time ◽  
Construction Materials ◽  
Pozzolanic Reaction ◽  
Strength Development ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Natural Pozzolan ◽  
Natural Pozzolans ◽  
Early Strength

Natural pozzolan is one of the oldest construction materials. Lime-pozzolan cements have been used for several thousands of years and have an excellent reputation for their durability. Pozzolans are being widely used as a cement replacement in Portland cement concrete. The use of pozzolans has the advantage of lower costs and better durability, but the disadvantage of a longer setting time and a slower early strength development. Different techniques have been tried to increase the reactivity of natural pozzolans to overcome these disadvantages. This paper has reviewed various methods used to activate the pozzolanic activity of natural pozzolans. All activation methods can be classified into three catalogues: thermal, mechanical, and chemical activation. A comparison based on strength–cost relationship indicates that the chemical activation method is the most effective and cheapest one.Key words: activation, reactivity, natural pozzolans, pozzolanic reaction, calcination, elevated temperature curing, chemical activators, strength, cost.

scholarly journals Study on Strength and Microstructure of Cement-Based Materials Containing Combination Mineral Admixtures

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Meijuan Rao ◽  
Jianpeng Wei ◽  
Zhiyang Gao ◽  
Wei Zhou ◽  
Qiaoling Li ◽  
...  
Keyword(s):  
Testing Machine ◽  
Steel Slag ◽  
Pozzolanic Reaction ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Strength Development ◽  
Hydration Products ◽  
Cement Based Materials ◽  
Aggregate Effect

The compressive strength of complex binders containing two or three blended mineral admixtures in terms of glass powder (GP), limestone powder (LP), and steel slag powder (SP) was determined by a battery solution type compressive testing machine. The morphology and microstructure characteristics of complex binder hydration products were also studied by microscopic analysis methods, such as XRD, TG-DTA, and SEM. The mechanical properties of the cement-based materials were analyzed to reveal the most appropriate mineral admixture type and content. The early sample strength development with GP was very slow, but it rapidly grew at later stages. The micro aggregate effect and pozzolanic reaction mutually occurred in the mineral admixture. In the early stage, the micro aggregate effect reduced paste porosity and the small particles connected with the cement hydration products to enhance its strength. In the later stage, the pozzolanic reaction of some components in the complex powder occurred and consumed part of the calcium hydroxide to form C-S-H gel, thus improving the hydration environment. Also, the produced C-S-H gel made the structure more compact, which improved the structure’s strength.

Study on effect of mixing condition on strength of mixture of dredged soil and steel slag

2012 ◽  
pp. 302-308 ◽  
Author(s):  
S Hirai ◽  
T Mizutani ◽  
Y Kikuchi ◽  
S Nakashima ◽  
K Iguchi
Keyword(s):  
Steel Slag ◽  
Mixing Condition ◽  
Dredged Soil

scholarly journals Assessing the long term effects on climate change of metallurgical slags valorization as construction material: a comparison between static and dynamic global warming impacts

2021 ◽  
Vol 1 (1) ◽  
pp. 88-111
Author(s):  
Andrea Di Maria ◽  
◽  
Annie Levasseur ◽  
Karel Van Acker ◽  
◽  
...  
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Carbon Footprint ◽  
Building Materials ◽  
Construction Material ◽  
Steel Slag ◽  
Construction Materials ◽  
Long Term Effects ◽  
Stainless Steel Slag ◽  
Environmental Evaluation

<abstract> <p>The interest in circular economy for the construction sector is constantly increasing, and Global Warming Potential (GWP) is often used to assess the carbon footprint of buildings and building materials. However, GWP presents some methodological challenges when assessing the environmental impacts of construction materials. Due to the long life of construction materials, GWP calculation should take into consideration also time-related aspects. However, in the current GWP, any temporal information is lost, making traditional static GWP better suited for retrospective assessment rather than forecasting purposes. Building on this need, this study uses a time-dependent GWP to assess the carbon footprint of two newly developed construction materials, produced through the recycling of industrial residues (stainless steel slag and industrial goethite). The results for both materials are further compared with the results of traditional ordinary Portland cement (OPC) based concrete, presenting similar characteristics. The results of the dynamic GWP (D_GWP) are also compared to the results of traditional static GWP (S_GWP), to see how the methodological development of D_GWP may influence the final environmental evaluation for construction materials. The results show the criticality of the recycling processes, especially in the case of goethite valorization. The analysis shows also that, although the D_GWP did not result in a shift in the ranking between the three materials compared with S_GWP, it provides a clearer picture of emission flows and their effect on climate change over time.</p> </abstract>

Potentials of steel slag and copper mine tailings as construction materials

2014 ◽  
Vol 18 (sup6) ◽  
pp. S6-250-S6-254 ◽  
Author(s):  
E. A. Oluwasola ◽  
M. R. Hainin ◽  
M. M. A. Aziz ◽  
H. Yaacob ◽  
M. N. M. Warid
Keyword(s):  
Mine Tailings ◽  
Steel Slag ◽  
Construction Materials ◽  
Copper Mine ◽  
Copper Mine Tailings
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