Development of a new cementless binder for marine dredged soil stabilization: Strength behavior, hydraulic resistance capacity, microstructural analysis, and environmental impact

2018 ◽  
Vol 186 ◽  
pp. 263-275 ◽  
Author(s):  
Tan Manh Do ◽  
Gyeongo Kang ◽  
Ngan Vu ◽  
Young-sang Kim
Keyword(s):  
Environmental Impact ◽  
Hydraulic Resistance ◽  
Soil Stabilization ◽  
Microstructural Analysis ◽  
Dredged Soil ◽  
Strength Behavior ◽  
Cementless Binder

scholarly journals Time-Dependent Strength Behavior, Expansion, Microstructural Properties, and Environmental Impact of Basic Oxygen Furnace Slag-Treated Marine-Dredged Clay in South Korea

2021 ◽  
Vol 13 (9) ◽  
pp. 5026
Author(s):  
Gyeong-o Kang ◽  
Jung-goo Kang ◽  
Jin-young Kim ◽  
Young-sang Kim
Keyword(s):  
Particle Size ◽  
Environmental Impact ◽  
South Korea ◽  
Mechanical Characteristics ◽  
Basic Oxygen Furnace ◽  
Microstructural Properties ◽  
Compression Tests ◽  
Basic Oxygen ◽  
Strength Behavior ◽  
Bof Slag

The aim of this study was to investigate the mechanical characteristics, microstructural properties, and environmental impact of basic oxygen furnace (BOF) slag-treated clay in South Korea. Mechanical characteristics were determined via the expansion, vane shear, and unconfined compression tests according to various curing times. Scanning electron microscopy was conducted to analyze microstructural properties. Furthermore, environmental impacts were evaluated by the leaching test and pH measurements. According to the results, at the early curing stage (within 15 h), the free lime (F-CaO) content of the BOF slag is a significant factor for developing the strength of the adopted sample. However, the particle size of the BOF slag influences the increase in the strength at subsequent curing times. It was inferred that the strength behavior of the sample exhibits three phases depending on various incremental strength ratios. The expansion magnitude of the adopted samples is influenced by the F-CaO content and also the particle size of the BOF slag. Regarding the microstructural properties, the presence of reticulation structures in the amorphous gels with intergrowths of rod-like ettringite formation was verified inside the sample. Finally, the pH values and heavy metal leachates of the samples were determined within the compatible ranges of the threshold effect levels in the marine sediments of the marine environment standard of the Republic of Korea.

scholarly journals Strength Development and Microstructural Behavior of Soils Stabilized with Palm Oil Fuel Ash (POFA)-Based Geopolymer

2021 ◽  
Vol 11 (8) ◽  
pp. 3572
Author(s):  
Isam Adnan Khasib ◽  
Nik Norsyahariati Nik Daud ◽  
Noor Azline Mohd Nasir
Keyword(s):  
Palm Oil ◽  
Soil Stabilization ◽  
Soft Soil ◽  
Microstructural Analysis ◽  
Dry Weight ◽  
Strength Development ◽  
Palm Oil Fuel Ash ◽  
Direct Shear Tests ◽  
Fuel Ash ◽  
Oil Fuel

Using geopolymer in soil stabilization has gained much attention recently due to its efficiency in improving soil properties and being environmentally friendly at the same time. This research aims to investigate the effect of palm oil fuel ash (POFA)-based geopolymer on soft soil stabilization. The mechanical and microstructural performance of two types of clay soil treated with geopolymer produce from POFA material was the focus of this study. In this respect, a series of unconfined compression and direct shear tests were conducted to investigate the mechanical properties of soils treated with POFA-based geopolymer. Furthermore, the microstructural changes in the treated samples were analyzed using field emission electron microscopy (FESEM) and energy dispersive X-ray (EDX). In accordance with the results, it was indicated that the shear strength of both soils soared by increasing the dosage of POFA-based geopolymer. Geopolymer with 40% POFA of the dry weight of soils yielded the highest UCS value at both curing periods, 7 and 28 days. Furthermore, the microstructural analysis revealed material modifications (N-A-S-H gel formation) related to strength enhancement. These results suggest the potentiality of using a POFA-based geopolymer binder to stabilize soft soil.

The Applications of Zeolite in Sustainable Binders for Soil Stabilization

2012 ◽  
Vol 256-259 ◽  
pp. 112-115 ◽  
Author(s):  
Jun Xian Shi
Keyword(s):  
Compressive Strength ◽  
Environmental Impact ◽  
Portland Cement ◽  
Unconfined Compressive Strength ◽  
Soil Stabilization ◽  
Testing Time ◽  
Content Ratio ◽  
Clayey Silt ◽  
Fuel Ash

In order to decrease the environmental impact caused by Portland cement in binders for soil stabilization, Zeolite was chosen to replace some percentage of Portland cement. Unconfined Compressive Strength (UCS) was used as a recognized parameter for assessing the performance of soil stabilization. The UCS values of the Zeolite-PC mix in three binder dosages (2.5%, 5.0% and 10%) and at three curing periods (7 days, 28 days and 90 days) were for two model soils; namely a gravel sand and a clayey silt. The experiment results demonstrated that the highest UCS value 1.28MPa, of Zeolite-PC mixes was obtained at 90 days, in a 10% content binder dosage, which has exceeded the current USA guideline of 350kPa, comparing all of the UCS values for all dosages and all curing periods in clayey silt. The highest UCS value of 7.65MPa for Zeolite-PC mixes was achieved at 90 days and in a 10% content binder dosage in gravel sand. In comparison, the PFA (Pulverised Fuel Ash)-PC mixes have presented lower UCS values than the Zeolite-PC mixes with the same content ratio and the same testing time.

scholarly journals Permeability Analysis of Dredged Material and Its Stabilization Using Surkhi/Brick Dust

2021 ◽  
Vol 9 (11) ◽  
pp. 2029-2034
Author(s):  
Misba Fayaz
Keyword(s):  
Construction Projects ◽  
Soil Stabilization ◽  
Waste Product ◽  
Alluvial Soil ◽  
Strong Relationship ◽  
Dredged Material ◽  
Brick Kilns ◽  
Dredged Soil ◽  
Earthen Dams ◽  
Brick Dust

Abstract: This study presents the permeability and strong relationship of dredged soil stabilized with surkhi/brick dust which is to be used for constructing road embankments. Tests like the unconfined compressive strength test and the falling head permeability test were conducted. The test results showed that as the percentage replacement of surkhi increases, the samples become less permeable. Showing that the surkhi tends to cover up the pore spaces of the soil, causing the water to have fewer passageways. Large amount of sediments are dredged from rivers and lakes as a result of environmental dredging in India. These dredged materials (DM) have poor Geotechnical properties and are normally treated as wastes. On the other Hand, there is a huge demand of sub-grade materials due to the increasing number of highway construction projects in the J&K. Thus, the reuse of the dredged material as sub-grade material may be considered as an Environmental-friendly and economical option. For the stabilization of dredged material various waste materials can be effectively used. brick dust is one such waste product. The surkhi/brick dust is generated from brick kilns. The amount of brick dust produced every year is in the range of 3-4 million ton. This project therefore intends to study the stabilization of dredged material procured from Sindh Nallah having a higher content of alluvial Soil using Surkhi/Brick dust as an additive. Soil stabilization by this means can be utilized on airport pavements, highway pavements, earthen dams and many other situations where sub-soils are not suitable for construction. Keywords: dredged material Sindh Nallah, surkhi, Dredged soil, CBR, UCS, proctor test, porosity, void ratio and permeability

Microstructural Analysis of SiO2-Al2O3 Glasses

1982 ◽  
Vol 40 ◽  
pp. 562-563
Author(s):  
C. M. Jantzen ◽  
D. G. Howitt
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Microstructural Analysis ◽  
Liquid Immiscibility ◽  
Metastable Region ◽  
Transmission Electron ◽  
Liquidus Temperatures

The mullite-SiO2 liquidus has been extensively studied, and it has been shown that the flattening of the liquidus is related to the existence of a metastable region of liquid immiscibility at sub-liquidus temperatures which is detectable by transmission electron microscopy (TEM) (Fig. 1).

Applications of ultramicrotomy for materials characterization

1993 ◽  
Vol 51 ◽  
pp. 232-233
Author(s):  
R.T. Blackham ◽  
J.J. Haugh ◽  
C.W. Hughes ◽  
M.G. Burke
Keyword(s):  
Materials Science ◽  
Microstructural Analysis ◽  
Analytical Electron Microscopy ◽  
Austenitic Stainless Steels ◽  
Specimen Preparation ◽  
Preparation Technique ◽  
Thermally Induced ◽  
Radiation Induced ◽  
Characterization Of Materials

Essential to the characterization of materials using analytical electron microscopy (AEM) techniques is the specimen itself. Without suitable samples, detailed microstructural analysis is not possible. Ultramicrotomy, or diamond knife sectioning, is a well-known mechanical specimen preparation technique which has been gaining attention in the materials science area. Malis and co-workers and Glanvill have demonstrated the usefulness and applicability of this technique to the study of a wide variety of materials including Al alloys, composites, and semiconductors. Ultramicrotomed specimens have uniform thickness with relatively large electron-transparent areas which are suitable for AEM anaysis.Interface Analysis in Type 316 Austenitic Stainless Steel: STEM-EDS microanalysis of grain boundaries in austenitic stainless steels provides important information concerning the development of Cr-depleted zones which accompany M23C6 precipitation, and documentation of radiation induced segregation (RIS). Conventional methods of TEM sample preparation are suitable for the evaluation of thermally induced segregation, but neutron irradiated samples present a variety of problems in both the preparation and in the AEM analysis, in addition to the handling hazard.

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