Article
Engineering, Civil
Rojimul Hussain, K. Ravi
Summary: The study found that biochar amendment increased the water holding capacity of soil and decreased the unsaturated hydraulic conductivity. This was attributed to the altered pore structure and increased tortuosity of water flow path in the soil due to biochar amendment. Biochar-amended soil is proposed to be used in bioengineered structures for promoting vegetation growth and enhancing performance.
JOURNAL OF HYDROLOGY
(2021)
Review
Green & Sustainable Science & Technology
Habib Ramezanzadeh, Davoud Zarehaghi, Ahmad Baybordi, Ali Chenari Bouket, Tomasz Oszako, Faizah N. Alenezi, Lassaad Belbahri
Summary: Biochar is a porous carbonaceous material that can improve the physical properties of soils. However, there is uncertainty about the effects of biochar application on soils, limiting its acceptance. Biochar affects the physical functions of soil, and factors such as feedstock, pyrolysis conditions, particle size, and rate of amendments influence its effectiveness. The chemical properties and interactions between biochar and soil interface also play a significant role in its impact.
Article
Biotechnology & Applied Microbiology
Yongli Qin, Beidou Xi, Xiaojie Sun, Hongxia Zhang, Chennan Xue, Beibei Wu
Summary: Hydrophobic biochar-amended landfill cover soil can reduce rainwater retention and enhance methane reduction potential by promoting the growth of methane-oxidizing bacteria.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Energy & Fuels
V. Veena, Sobha Cyrus, Benny Mathews Abraham, Babu T. Jose
Summary: This study investigates the replacement of bentonite with biochar in compacted M sand bentonite mixtures. The results show that increasing biochar content decreases the maximum dry unit weight and increases the optimum moisture content. Samples with 10% biochar content have hydraulic conductivity lower than 1x10(-9) m/sec. Addition of wood and rice husk biochar decreases the free swell, strength, and cracking potential.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Construction & Building Technology
Arif Ali Baig Moghal, Mohammed Ashfaq, Ali Abdul Kareem Hamood Al-Obaid, Mohammad Farid Abbas, Ahmed Mohammed Al-Mahbashi, Abdullah Ali Shaker
Summary: The study reveals that delay in compaction results in an increase in hydraulic conductivity and compressibility of soils, while the unconfined compressive strength decreases with the increase in delay period.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
Article
Construction & Building Technology
Nor Azalina Rosli, Hamidi Abdul Aziz, Mohamad Razip Selamat, Leonard Lik Pueh Lim, Mohd Hafiz Zawawi
Summary: This study found that the unconfined compressive strength of sewage sludge and red gypsum mixture increased with compaction degree, while the hydraulic conductivity was initially affected but stabilized at a low level over time. The leached metal concentration and COD were below the regulated limit, posing no negative impact on the environment.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Seyyed Ali Akbar Nakhli, Sydney Goy, Kalehiwot Nega Manahiloh, Paul Thomas Imhoff
Summary: The study investigated particle segregation in biochar-amended media and its impact on saturated hydraulic conductivity. Dry-packed columns showed segregation due to differences in physical properties of media and biochar, while wet-packed columns prevented segregation due to inter-particle adhesion forces associated with water. Although segregation altered particle distributions and pore morphologies, the saturated hydraulic conductivity for wet-packed and dry-packed columns remained statistically identical. The study recommends mixing under wet conditions to inhibit particle segregation for effective applications in both laboratory and field settings.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Yuekai Xie, Hongxu Wang, Yingying Guo, Chenman Wang, Hanwen Cui, Jianfeng Xue
Summary: This study investigates the potential application of biochar-amended soils as landfill covers. The results indicate that biochar-amended soils as intermediate covers can increase the pH of leachate and decrease the accumulation of VFAs. Additionally, the application of biochar-amended soils as both intermediate and final covers can increase the biocompression ratios and settlement of municipal solid wastes.
Article
Construction & Building Technology
Oluwapelumi Olumide Ojuri, Veshara Ramdas, Ebenezer A. Aderibigbe, Charles Gbenga Williams, Santosh Ramchuran, Hassan Al-Nageim
Summary: This study investigated the potential of using locally sourced biopolymer soil stabilisation materials to improve the engineering properties of regional clay soils. The results showed that the use of locally sourced materials significantly enhanced the engineering properties of the clay, with cassava peel powder performing the best.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Geological
Yi-Jie Wang, Ning-Jun Jiang, Xiao-Le Han, Yan-Jun Du
Summary: The study investigates the effect of biochar amendment on the shear strength of biocemented calcareous sand through the biostimulation approach. The results show that the amendment of biochar can increase the overall cementitious content of the biocemented sand. The shear strength enhancement provided by biochar depends on the biochar content, cementitious content, and initial relative density.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Environmental
Abouzar Sadrekarimi
Summary: The addition of surfactants can reduce the surface tension of pore fluid and improve the compressibility and shear strength of clay samples. This study found that the Atterberg limits decreased and plasticity indices decreased as the amount of surfactant in the pore fluid increased. Moreover, the addition of surfactant increased the shear strength and compressibility of the clay samples.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Jianjun Dong, Di Yang, Yuan Mei, Ke Gao
Summary: This study investigates the impact of severe drying-wetting alternation on the safety and stability of high-altitude mining dumps using numerical calculations and theoretical analysis. The results show that increasing intensity of the wetting-drying alternation leads to soil saturation, decreased shear strength, and sliding of the dump, while the cumulative settlement value increases with time and eventually stabilizes.
Article
Engineering, Geological
Zheng Zhou, Anthony Kwan Leung
Summary: This study measures the mechanical properties of silica sand hydrophobized by dimethyldichlorosilane (DMDCS) under different hydrophobic conditions, and finds that the formation of hydrophobic coating has a significant impact on the soil mechanical properties.
Review
Engineering, Environmental
Paulina Godlewska, Yong Sik Ok, Patryk Oleszczuk
Summary: Biochar has great potential for environmental and agricultural applications, but caution is needed as it may contain harmful substances that can negatively impact organisms. Factors such as feedstock, pyrolysis temperature, and contaminants content play a crucial role in determining the toxicity of biochar.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Polymer Science
Zheyuan Jiang, Xianlei Fu, Jianyong Shi, Chi Che, Yanjun Du
Summary: This study investigates the engineering properties of a novel vertical cutoff wall backfill composed of reactive magnesia (MgO)-activated ground granulated blast furnace slag (GGBS), sodium-activated calcium bentonite amended with polyacrylamide cellulose (PAC), and clean sand (MSBS-PAC). Compared to backfills composed of MSBS, the MSBS-PAC backfill shows lower pH, dry density, higher void ratio, lower unconfined compressive strength and strain at failure, and lower hydraulic conductivity after 28-day and 90-day curing. The lower hydraulic conductivity of MSBS-PAC backfill is attributed to the improvement of pore structure and pore fluid environment by PAC amendment.
Article
Engineering, Environmental
Jyoti K. Chetri, Krishna R. Reddy, Stefan J. Green
Summary: In recent years, biochar-amended soil cover has shown promise for enhancing microbial methane oxidation and reducing methane emissions. This study found that biochar infused with methane-oxidizing bacteria can reduce acclimation time and enhance methane oxidation activity. The addition of activated biochar to landfill cover soil resulted in higher methane oxidation rates and a shorter lag phase.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2022)
Review
Engineering, Environmental
Ashutosh Kumar, Sarat Kumar Das, Lohitkumar Nainegali, Krishna R. Reddy
Summary: Coal production leads to the generation of extensive coal overburden (OB), resulting in groundwater and soil contamination, land degradation, and biodiversity loss. This paper conducts a systematic bibliometric analysis to analyze the trend topics related to OB generation and management worldwide. Traditional reclamation techniques, the benefits and limitations of biological remediation methods, and the advantages of vegetation as a sustainable approach for OB management are summarized. Challenges associated with vegetation and future research needs are identified. The study also discusses the mechanisms of dump slope stability enhancement and methods to estimate root cohesion during the vegetation process.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Construction & Building Technology
Xian-Lei Fu, Heng Zhuang, Krishna R. Reddy, Ning-Jun Jiang, Yan-Jun Du
Summary: This study developed a novel composite polymer-amended bentonite for environmental containment applications. Laboratory experiments were conducted to evaluate the properties of the polymer-amended bentonite, including free swell index, liquid limit, hydraulic conductivity, rheological properties, and polymer stability. The results showed that the polymer-amended bentonite with a PAC-HPMC mass ratio of 7 had the lowest hydraulic conductivity and stronger hydrogen bonding strength. The yield stress of the polymer-amended bentonite was found to be a good indicator for evaluating polymer stability and the effectiveness of the engineered barrier material.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Sukran Gizem Alpaydin, Yeliz Yukselen-Aksoy
Summary: The effects of tincal and ulexite additives on the shear strength behavior of SBMs at 80 degrees C and room temperature were investigated. The results showed that the addition of boron increased the shear strength of SBMs, especially for 20% SBMs at high temperature. Tincal and ulexite can be used to improve the shear strength of SBMs at high temperatures.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Environmental Sciences
Ashutosh Kumar, Sarat Kumar Das, Lohitkumar Nainegali, Krishna R. Reddy
Summary: This paper discusses the effect of organic amendment on the growth characteristics and root distribution of native grass Dendrocalamus strictus species in India. The results show that the chosen grass can survive on the coalmine overburden dumps with suitable external amendment and exhibit a well-developed root system and higher root reinforcement.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2023)
Review
Green & Sustainable Science & Technology
Krishna R. Reddy, Valeria Kandou, Rachel Havrelock, Ahmed Rachid El-Khattabi, Teresa Cordova, Matthew D. Wilson, Braeden Nelson, Citlalli Trujillo
Summary: Water reuse is a practical solution to address water scarcity by augmenting water supplies. However, implementing water reuse can be challenging due to infrastructure requirements, economic issues, and social acceptance.
Article
Environmental Sciences
Anshumali Mishra, Sarat Kumar Das, Krishna R. R. Reddy
Summary: The performance of cement mortar and concrete incorporating 100% coalmine overburden (OB) as aggregate was evaluated through carbonation and rapid chloride penetration tests. The results showed that OB can be a good replacement for natural aggregate in construction materials, and the performance under corrosion testing was comparable to river sand.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Engineering, Environmental
Bhoomi A. Kamdar, Chandresh H. Solanki, Krishna R. Reddy
Summary: This research utilizes an organic binder to remediate lead-contaminated soil using the stabilization/solidification technique, avoiding the environmental consequences of inorganic binders like cement. The study synthesizes biochar through slow pyrolysis of moringa seed cake or de-oiled cake and investigates its physicochemical characteristics, revealing its potential for lead adsorption due to high pH and abundant surface functional groups. The effects of biochar content and curing time on soil stabilization are evaluated, showing that 10% biochar and 28 days of curing effectively reduce lead leachability and improve soil strength and pH.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2023)
Article
Engineering, Geological
Xian-Lei Fu, Zhe-Yuan Jiang, Krishna R. Reddy, Kunlin Ruan, Yan-Jun Du
Summary: The effects of organic acid-laden groundwater exposure on the hydraulic conductivity and microscopic characteristics of sand-bentonite backfill in slurry trench cutoff walls were comprehensively assessed.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Construction & Building Technology
Anshumali Mishra, Sarat Kumar Das, Krishna R. Reddy
Summary: This study investigates the potential of coal mine overburden (OB) from opencast mine dumps as a sustainable alternative to natural aggregate. The study evaluates the microproperties (mineralogy, morphology, and chemistry) and macroproperties (alkali-aggregate reaction, soundness, durability, flow value, ultrasonic pulse velocity, and mechanical properties) of crushed OB, OB-based mortar, and concrete. The results show that OB is mineralogically more stable, mechanically comparable, and durable than other natural aggregate alternatives. There are no hazardous effects on soil and water quality due to leaching. OB-based mortar and concrete exhibit good corrosion resistance.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Anshumali Mishra, Sarat Kumar Das, Krishna R. Reddy
Summary: Due to the global sand crisis, the use of natural sand is no longer sustainable. Coal mine overburden sand and crushed granite sand are two environmentally friendly alternatives. This study compares their life cycle assessments and finds that OBS causes less environmental burden compared to M-Sand, with significant reductions in impacts on human health, ecosystem quality, climate change, and resource depletion.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Geological
Ashutosh Kumar, Sarat Kumar Das, Lohitkumar Nainegali, K. V. N. S. Raviteja, Krishna R. Reddy
Summary: Coal mine waste rocks are disposed of in non-engineered dumps with a height of 100-120 m to reduce space utilization. However, these dumps are prone to slope failures due to the loose, cohesionless material and high heterogeneity. This study evaluates the stability of a typical dump configuration in Jharkhand, India and investigates the influence of slope geometry and material heterogeneity on slope stability through numerical analysis and parametric studies. Recommendations for remediation methods, including modified slope geometry and benches, are provided to achieve the desired safety factor.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Bhoomi A. Kamdar, Chandresh H. Solanki, Krishna R. Reddy
Summary: This study investigated the stabilization and solidification effect of hardwood biochar on soil contaminated with high concentrations of lead. The results showed that the TCLP lead levels decreased with increasing biochar dosage and curing time. Adding 5 wt.% biochar could achieve an immobilization efficiency of 88% after 28 days of curing. X-ray diffraction and scanning electron microscopy analyses indicated that physical adsorption and lead precipitation were the underlying mechanisms for Pb immobilization.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2023)
Article
Engineering, Environmental
Sumaja Kolli, Pradeep Kumar Dammala, Ahsan Ul Haq, Krishna R. R. Reddy
Summary: This study proposes a method to solve the problems of marble slurry disposal and sand migration in Rajasthan, India. By treating the discarded marble slurry and sand, a crust is formed to stabilize the sand dunes and reduce wind-led soil erosion by up to 70%. However, further experiments and field tests are needed to determine the optimal mixture of marble slurry and sand.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2023)
Proceedings Paper
Construction & Building Technology
Sukran Gizem Alpaydin, Yeliz Yukselen-Aksoy
Summary: This study investigated the volumetric deformation behavior of sand-bentonite mixtures containing 10% bentonite under room temperature and thermal cycles. Ulexite, a boron mineral known for its high temperature resistance and low thermal expansion coefficient, was added at rates of 10% and 20% by dry weight. The results showed that the addition of ulexite increased the compression amount at room temperature, while decreasing the swelling amount. However, the total compression amounts were reduced by half when thermal cycles were applied compared to room temperature tests.
5TH INTERNATIONAL CONFERENCE ON NEW DEVELOPMENTS IN SOIL MECHANICS AND GEOTECHNICAL ENGINEERING, ZM 2022
(2023)