Effects of primary curing and subsequent disturbances on strength development of steel slag-treated marine clay

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.

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Accelerated carbonation of steel slag monoliths at low CO2 pressure – microstructure and strength development

Journal of CO2 Utilization ◽

10.1016/j.jcou.2019.10.022 ◽

2020 ◽

Vol 36 ◽

pp. 124-134 ◽

Cited By ~ 3

Author(s):

P. Nielsen ◽

M.A. Boone ◽

L. Horckmans ◽

R. Snellings ◽

M. Quaghebeur

Keyword(s):

Steel Slag ◽

Strength Development ◽

Accelerated Carbonation ◽

Low Co2

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Effectiveness of waste steel slag powder on the strength development and associated micro-mechanisms of cement-stabilized dredged sludge

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.117975 ◽

2020 ◽

Vol 240 ◽

pp. 117975 ◽

Cited By ~ 4

Author(s):

Lei Lang ◽

Chunyu Song ◽

Lin Xue ◽

Bing Chen

Keyword(s):

Steel Slag ◽

Strength Development ◽

Slag Powder ◽

Steel Slag Powder ◽

Dredged Sludge

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Impact of field conditions on the strength development of a geopolymer stabilized marine clay

Applied Clay Science ◽

10.1016/j.clay.2018.10.005 ◽

2019 ◽

Vol 167 ◽

pp. 33-42 ◽

Cited By ~ 13

Author(s):

Mohammadjavad Yaghoubi ◽

Arul Arulrajah ◽

Mahdi Miri Disfani ◽

Suksun Horpibulsuk ◽

Stephen Darmawan ◽

...

Keyword(s):

Field Conditions ◽

Strength Development ◽

Marine Clay

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Effect of steel slag on the hydration and strength development of calcium sulfoaluminate cement

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.120301 ◽

2020 ◽

Vol 265 ◽

pp. 120301 ◽

Cited By ~ 1

Author(s):

Yishun Liao ◽

Guoxi Jiang ◽

Kejin Wang ◽

Siraj Al Qunaynah ◽

Wenjie Yuan

Keyword(s):

Steel Slag ◽

Strength Development ◽

Calcium Sulfoaluminate Cement ◽

Calcium Sulfoaluminate

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Use of CO2 to Cure Steel Slag and Gypsum-Based Material

Energies ◽

10.3390/en14165174 ◽

2021 ◽

Vol 14 (16) ◽

pp. 5174

Author(s):

Xue Wang ◽

Wen Ni ◽

Jiajie Li ◽

Siqi Zhang ◽

Keqing Li ◽

...

Keyword(s):

Co2 Capture ◽

Building Materials ◽

Steel Slag ◽

Binding Energies ◽

Strength Development ◽

Co2 Uptake ◽

Hydration Products ◽

Al Content ◽

High Al Content ◽

Carbonation Curing

To improve the utilization of steel slag (SS) in CO2 capture and making building materials, the paper mainly discussed the effects of desulphurization gypsum (DG) and w/s ratio on strength development and CO2 capture capability of high Al content SS. It showed that 10 wt% DG enhanced the strength of hydration-curing SS by 262% at 28 days. Similarly, adding 6 wt% DG in carbonation-curing SS contributed to increases in strength and CO2 uptake by 283% and 33.54%, reaching 42.68 MPa and 19.12%, respectively. Strength decreases and CO2 uptake increases with w/s. Microanalysis (QXRD, SEM-EDS, TG-DTG, FTIR, XPS, and MIP) revealed that the main hydration products of SS were C-S-H gel and C4AH13, which transformed to ettringite with DG addition. The carbonation products were mainly calcite and aragonite. Additionally, the amount of aragonite, mechanically weaker than calcite, decreased and calcite increased significantly when DG was added in carbonation-curing samples, providing a denser structure and higher strength than those without DG. Furthermore, high Al 2p binding energies revealed the formation of monocarboaluminate in the DG-added carbonation samples, corresponding to higher CO2 uptake. This study provides guidance for the preparation of SS-DG carbide building materials.

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Pilot production of steel slag masonry blocks

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2017-0603 ◽

2018 ◽

Vol 45 (7) ◽

pp. 537-546 ◽

Cited By ~ 7

Author(s):

Mehrdad Mahoutian ◽

Omar Chaallal ◽

Yixin Shao

Keyword(s):

Carbon Dioxide ◽

Steel Slag ◽

Strength Development ◽

Carbon Uptake ◽

X Ray Diffraction ◽

Calcium Carbonates ◽

Full Size ◽

X Ray ◽

Carbon Dioxide Utilization ◽

Derivative Thermogravimetry

Masonry blocks are usually made of Portland cement and cured by steam. This study explores the possibility of making masonry blocks using steel slag as binder and carbon dioxide as curing activator. By carbonation activation of steel slag blocks, carbon dioxide can be permanently sequestered in steel slag as calcium carbonates, leading to stronger and more durable construction blocks. In this paper, carbonated steel slag paste was first evaluated by thermogravimetry, derivative thermogravimetry, X-ray diffraction, carbon uptake, strength development, and leaching tests. Based on the preliminary results, the full-size masonry blocks were fabricated using steel slag as the binder and granite as the aggregates. The physical properties and durability of full-size steel slag masonry blocks were then examined through their density, water absorption, moisture content, compressive strength, and fire resistance. An economic analysis was performed and a carbon dioxide utilization capacity was estimated. This study demonstrates that production of steel slag masonry blocks by carbonation is an economically feasible way to utilize carbon dioxide.

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