scholarly journals Peat soil mass stabilization using geopolymeric hybrid material in early age

2019 ◽  
Vol 276 ◽  
pp. 05003
Author(s):  
Gunawan Wibisono ◽  
Erwin ◽  
Alfian Kamaldi ◽  
Monita Olivia
Keyword(s):  
Fly Ash ◽  
Cement Hydration ◽  
Peat Soil ◽  
High Water ◽  
Organic Soil ◽  
Soil Mass ◽  
High Water Content ◽  
Strength Development ◽  
Initial Strength ◽  
Pozzolanic Material

Peat is an organic soil, highly compressible and has high water content. The soil needs to be stabilized chemically by incorporating binders such as cement and lime into the soil that will change the properties and soil strength. However, stabilization using cement solely is not recommended since the organic acid in peat soil could delay cement hydration process. Furthermore, mass stabilization using pozzolanic material also could improve strength development of peat soil. In this research, the pozzolanic material in the form of geopolymer hybrid or geopolymer with the addition of Ordinary Portland Cement was investigated. Geopolymer was produced by activating fly ash with a combination of NaOH and sodium silicate. OPC addition improves initial strength and assists geopolymerization at ambient temperature. Variables studied were binder content and a percentage of OPC, and percentage of fly ash. Unconfined Compressive Stress (UCS) at 7 days was measured for all specimens. Mass stabilization using fly ash geopolymer hybrid could improve strength development of peat soil.

Analysis on Rheological Properties of Peat Soil in Kunming Area

2012 ◽  
Vol 204-208 ◽  
pp. 722-726
Author(s):  
Yi Peng Guo ◽  
Xiao Nan Wang ◽  
Zheng Fa Lai ◽  
Jun Qing Lv
Keyword(s):  
Rheological Properties ◽  
Stress Level ◽  
Peat Soil ◽  
Strain Curve ◽  
High Water ◽  
Engineering Properties ◽  
Dianchi Lake ◽  
High Water Content ◽  
Peat Soils ◽  
Loading And Unloading

Kunming area is adjacent to Dianchi Lake. Peat soil with high water content and high compressibility is widely distributed, rheological properties is one of the most important engineering properties of peat soil. However, compared with the peat soils in the other areas, the peat soil in Kunming area has different properties. This paper studied rheological properties of peat soil in Kunming area by using the creep test of loading and unloading, on the basis of the strain-time curves, parting linear visco-elasticity, linear visco-plasticity and nonlinear visco-plasticity from the total deformation. Research shows that: ①The deformation is mostly composed of unrecoverable deformation and there is instantaneous elastic strain, instantaneous plastic strain in total strain; ②In low stress level,the soil is rendered as visco-elasticity. However, when the stress level is high, the performance of soil is visco-plasticity; ③By stress-strain curve clusters, yield stress of peat soil is approximate to 3.6 kPa in Kunming; ④Along with the time, modulus of linear visco-elasticity tended to be stable.

scholarly journals Novel Conditioner For Efficient Dewaterability And Modification of Oily Sludge With High Water Content

2021 ◽  
Author(s):  
Biming Liu ◽  
Yue Teng ◽  
Wenbin Song ◽  
Haixia Wu
Keyword(s):  
Fly Ash ◽  
Water Content ◽  
Radical Reaction ◽  
Calorific Value ◽  
High Water ◽  
Economic Benefits ◽  
Hazardous Substances ◽  
High Water Content ◽  
Oily Sludge ◽  
Free Radical Reaction

Abstract The Oily sludge with high water content (OS) was dewatered, modified and converted into solid fuel by a novel chemical conditioner (OSO-101). The effect of OSO-101 dosage on the dewaterability of OS was studied, showing that OSO-101 dosage of 15% (wt.) could achieve the best dewaterability efficiency of OS (98.18%). Meanwhile, compared with some conventional conditioners, OSO-101 developed by our team was more effective in improving OS dewaterability efficiency. And OSO-101 may have free radical reaction, polar reaction and redox reaction with petroleum hydrocarbons in OS, thereby polymerizing and forming condensed solid structures. The calorific value change of OS after conditioning, heavy metal content and dioxins content of fly ash leached from incinerated product were measured for resource analysis and environmental assessment. Results showed that the resultant OS fuel blocks had extremely low content of heavy metals, dioxins and other toxic and hazardous substances leached from fly ash, thereby no secondary treatment and fully meeting environmental protection emission standards. Additionally, OSO-101 had certain economic rationality, and could effectively recover the calorific value contained in OS. This research is expected to provide new insights for efficient dewaterability and modification of OS, as well as subsequent resource utilization and harmless treatment, bringing potential environmental and economic benefits.

Study on the Difference between Turfy Soil and Normal Peat Soil in China

2011 ◽  
Vol 105-107 ◽  
pp. 1551-1554 ◽  
Author(s):  
Yan Lv ◽  
Lei Nie ◽  
Kai Xu ◽  
Zhan Dong Su
Keyword(s):  
Peat Soil ◽  
Specific Weight ◽  
High Water ◽  
Structural Features ◽  
Organic Content ◽  
Engineering Properties ◽  
High Water Content ◽  
Consolidation Coefficient ◽  
The Difference ◽  
High Organic Content

As the special soil, turfy soil and peat soil in China contained some similar properties with high void ratio, high water content, high organic content, etc. But turfy soil also had properties which difference from peat soil. In this paper, based on the formation of the cause and geological environment and geomorphologic characteristics of geological in the quaternary, took the typical and widespread turfy soil and peat soil regions for example, systematically discussed the material composition and macroscopic and microcosmic structural features, put further research on the physical chemistry mechanical characteristics. Then the come to the conclusion that the essential reason for difference between turfy soil and peat soil were decomposition degree and organic content. The result that worse engineering properties such as higher the moisture content, porosity, compressibility, internal cohesion and the lower specific weight, consolidation coefficient and permeability were due to the lower decomposition degree and higher organic content of turfy soil than peat soil. It can provide reference to the practical projects of turfy soil to distinguish peat soil according to this characteristic.

scholarly journals Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6524
Author(s):  
Traore Abdoul Fatah ◽  
Rongjun Zhang ◽  
Xiaosong Huang ◽  
Junjie Zheng ◽  
Yu Miao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Water Content ◽  
Experimental Tests ◽  
High Water ◽  
Aluminum Silicate ◽  
High Water Content ◽  
Strength Development ◽  
Efficient Technology ◽  
The Stability ◽  
Mining Sludge

Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge because it improves the stability of sludge dumping sites and reduces the leachability of contaminants. Very few studies investigate the S/S of mining sludge, especially with high water content. This paper investigated the effectiveness of S/S for the treatment of mining sludge at high water content by using quick lime (CaO) activated ground granulated blast furnace slag (GGBS) in comparison to ordinary Portland cement (OPC). To evaluate the mechanical, leaching, and microstructural behavior of CMS at high water content stabilized by lime-activated GGBS and OPC, a series of laboratory experimental tests were performed. Experimental results indicated that increasing the dosage of binder led to increased strength and decreased leachability of the heavy metal. In contrast, an increase in the water content of the mixture resulted in a decrease in compressive strength and an increase in the leachability of heavy metals. On the other hand, lime-activated GGBS mixes had substantially better performance than OPC mixes in the aspect of strength development of treated mining sludge and showed comparable capability of heavy metal stabilization compared to OPC. The microstructural tests revealed the formation of different hydration products such as calcium silicate hydrate, calcium aluminum silicate hydrate, ettringite, hydrotalcite, and heavy metal complexes in CG and OPC mixes.

scholarly journals Geotechnical properties of sewage sludge solidified with Sulphoaluminate cement

2019 ◽  
Vol 81 ◽  
pp. 01015 ◽  
Author(s):  
Xihui Fan ◽  
Haoqing Xu ◽  
Shengwei Wang ◽  
Shi Shu ◽  
Naixi Lin ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Construction Material ◽  
High Water ◽  
Organic Soil ◽  
Geotechnical Properties ◽  
High Water Content ◽  
Atterberg Limit ◽  
Sulphoaluminate Cement ◽  
The Impact ◽  
Landfill Disposal

The geotechnical properties of sewage sludge solidified with sulphoaluminate cement are presented. The sludge has a high water content and organic matter which is not easy to disposal. After Solidification/Stabilization (S/S), landfill disposal of sewage sludge is widely adopted in China. However, there is little research focused on the geotechnical properties of sewage sludge after S/S treatment and the impact on the landfill site is also difficult to be evaluated. To solve this problem, this paper is aimed to evaluate the basic mechanics properties of solidified materials by means of Atterberg limit, triaxial test, consolidation test and permeability test. The result showed that the strength and the hydraulic conductivity of the modified sludge was close to that of the high organic soil. By adding suitable additives, modified sludge could not only satisfy the requirement of being landfilled but also be utilized as a construction material.

Influence of Fly Ash on Unconfined Compressive Strength of Cement-Admixed Clay at High Water Content

2010 ◽  
Vol 22 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Pornkasem Jongpradist ◽  
Narongrit Jumlongrach ◽  
Sompote Youwai ◽  
Somchai Chucheepsakul
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Content ◽  
Unconfined Compressive Strength ◽  
High Water ◽  
High Water Content

scholarly journals Strength Characteristics and Heavy Metal Leaching Behavior of Contaminated Mining Sludge at Extra High Water Content Solidified/Stabilized with Lime Activated GGBS or OPC

2021 ◽  
Author(s):  
Traore Abdoul Fatah ◽  
Rong-Jun Zhang ◽  
Xiao-Song Huang ◽  
Yu Miao ◽  
Aamir Khan Mastoi
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Water Content ◽  
High Water ◽  
High Water Content ◽  
Strength Development ◽  
Efficient Technology ◽  
Heavy Metal Leaching ◽  
The Stability ◽  
Mining Sludge

Abstract Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/Stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge because it not only improves the stability of sludge dumping sites but also reduces the leachability of contaminants. Very few studies investigate the S/S of mining sludge, especially with extra high water content. This paper investigated the effectiveness of S/S for the treatment of mining sludge at extra high water content by using quick lime (CaO) activated ground granulated blast furnace slag (GGBS) in comparison to ordinary Portland cement (OPC). To evaluate the mechanical, leaching, and microstructural behavior of mining sludge at extra high water content stabilized by lime activated GGBS and OPC, a series of laboratory experiments were performed, including unconfined compressive strength (UCS), toxicity characteristics leaching procedure (TCLP), X-Ray diffraction, and scanning electron microscopy (SEM) tests, etc. Experimental results indicated that increasing the binder content led to increased strength and decreased leachability of the heavy metal. In contrast, an increase in the water content of the mixture resulted in a decrease in compressive strength and an increase in leachability of heavy metals. On the other hand, lime activated GGBS had substantially better performance than OPC in the aspect of strength development of treated mining sludge and moreover showed comparable capability of heavy metal stabilization in contrast to OPC.

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