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Articles 1 - 14 of 14
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Effective Exploitation Potential Of Shale Gas From Lower Cambrian Niutitang Formation, Northwestern Hunan, China, Han Cao, Tianyi Wang, Ting Bao, Pinghe Sun, Zheng Zhang, Jingjing Wu
Effective Exploitation Potential Of Shale Gas From Lower Cambrian Niutitang Formation, Northwestern Hunan, China, Han Cao, Tianyi Wang, Ting Bao, Pinghe Sun, Zheng Zhang, Jingjing Wu
Michigan Tech Publications
The marine shale in the Lower Cambrian Niutitang Formation is the dominant shale-gas reservoir in northwestern Hunan, which accounts for more than 70% of unconventional energy in Hunan province. Accurately evaluating the shale-gas exploitation potential is a key to determining whether commercial exploitation standards can be met. In the literature, most existing studies have focused on evaluating the shale-gas exploitation potential based on either accumulation conditions or the shale fracability, which will lead to a gap between the real production and proven gas reserves due to the characteristics of the shale’s low permeability and low porosity. Therefore, further studies are …
Rheological Performance Of Bio-Char Modified Asphalt With Different Particle Sizes, Ran Zhang, Qingli Dai, Zhanping You, Hainian Wang, Chao Peng
Rheological Performance Of Bio-Char Modified Asphalt With Different Particle Sizes, Ran Zhang, Qingli Dai, Zhanping You, Hainian Wang, Chao Peng
Michigan Tech Publications
To improve the performance of petroleum asphalt, bio-char was used as a modifier for a petroleum asphalt binder, in this study. The rheological properties of bio-char modified asphalt binders were compared with different particle sizes and contents, with one control and one flake graphite modified asphalt binder. Specifically, the bio-char modifiers with two particle sizes (ranging from 75 μm–150 μm and less than 75 μm) and three contents of 2%, 4%, and 8% were added into the asphalt binder. A flake graphite powder with particle sizes less than 75 μm was used as a comparison modifier. The Scanning Electron Microscopy …
Standardization Of Fatigue Characteristics Of Cement-Treated Aggregate Base Materials Under Different Stress States, Jiawei Xie, Limin Tang, Songtao Lv, Naitian Zhang, Tuo Huang, Hongfu Liu
Standardization Of Fatigue Characteristics Of Cement-Treated Aggregate Base Materials Under Different Stress States, Jiawei Xie, Limin Tang, Songtao Lv, Naitian Zhang, Tuo Huang, Hongfu Liu
Michigan Tech Publications
In this study, to decrease the evaluation uncertainty of the fatigue characteristics of cement-treated aggregate base materials under different test conditions, unconfined compressive, indirect tensile, flexural tensile strength tests and fatigue tests of these base materials with different cement content and at different curing times were carried out. The Weibull distribution was employed to analyze fatigue test results. The standardization model of fatigue characteristics for cement-treated aggregate base materials under different stress states was established. Based on the interval analysis theory, the fatigue characteristic model under different stress states was established using interval parameters. Results revealed that the curing time …
Nonlinear Fatigue Damage Of Cracked Cement Paste After Grouting Enhancement, Zhi Wang, Long Li, Shuaicheng Guo, Qingli Dai
Nonlinear Fatigue Damage Of Cracked Cement Paste After Grouting Enhancement, Zhi Wang, Long Li, Shuaicheng Guo, Qingli Dai
Michigan Tech Publications
Grouting reinforcement is an important part of modern engineering and has grown in popularity due to the benefits of grouting enhancement on cyclic loading. Understanding the fatigue mechanism of grouting-enhanced structures is vital to the design and the long-term stability analysis of such structures. In this study, the fatigue mechanical properties of cracked cement paste after epoxy resin grouting enhancement under different cyclic conditions were investigated in the laboratory and an inverted S-shaped curve was proposed to describe the damage accumulation. The test results indicated that the fatigue axial deformation can be divided into three stages: the initial stage, constant …
Effects Of Titanate Coupling Agent On Engineering Properties Of Asphalt Binders And Mixtures Incorporating Lldpe-Caco3 Pellet, Mohd Rosli Mohd Hasan, Zhanping You, Mohd Khairul Idham Mohd Satar, Muhammad Naqiuddin Mohd Warid, Nurul Hidayah Mohd Kamaruddin, Dongdong Ge, Ran Zhang
Effects Of Titanate Coupling Agent On Engineering Properties Of Asphalt Binders And Mixtures Incorporating Lldpe-Caco3 Pellet, Mohd Rosli Mohd Hasan, Zhanping You, Mohd Khairul Idham Mohd Satar, Muhammad Naqiuddin Mohd Warid, Nurul Hidayah Mohd Kamaruddin, Dongdong Ge, Ran Zhang
Michigan Tech Publications
This study was initiated to evaluate the performance of asphalt binders and mixtures incorporating linear low-density polyethylene- calcium carbonate (LLDPE-CaCO3) pellet, either with or without titanate coupling agent. The detailed manufacturing process of modifier pellets was displayed. The coupling agent was used to enhance the cross-linking between materials by means of winding up covalent bonds or molecule chains, thus improving the performance of composites. In the preparation of modified bitumen, the preheated asphalt binder was mixed with the modifiers using a high shear mixer at 5000 rpm rotational speed for 45 min. Experimental works were conducted to evaluate …
Laboratory Evaluation On Performance Of Compound-Modified Asphalt For Rock Asphalt/Styrene–Butadiene Rubber (Sbr) And Rock Asphalt/Nano-Caco3, Songtao Lv, Shuangshuang Wang, Tong Guo, Chengdong Xia, Jianglong Li, Gui Hou
Laboratory Evaluation On Performance Of Compound-Modified Asphalt For Rock Asphalt/Styrene–Butadiene Rubber (Sbr) And Rock Asphalt/Nano-Caco3, Songtao Lv, Shuangshuang Wang, Tong Guo, Chengdong Xia, Jianglong Li, Gui Hou
Michigan Tech Publications
As a natural modifier of asphalt, rock asphalt has been widely used to improve its thermal stability and aging resistance. However, the thermal cracking resistance of asphalt modified by rock asphalt is unsatisfactory. In order to improve the thermal cracking resistance in low temperature, two kinds of modifiers—styrene–butadiene rubber (SBR) and nano-CaCO3—were selected as the compound modifiers, and then implemented to improve the low-temperature performance of the binder. Then, compound asphalt modified by Buton rock asphalt (BRA) was chosen as the study subject. The thermal stability and aging resistance of asphalt modified by BRA, compound-modified asphalt by BRA/SBR, …
Assessment Of Soil Erosion Vulnerability In The Heavily Populated And Ecologically Fragile Communities In Motozintla De Mendoza, Chiapas, Mexico, Selene González-Morales, Alex Mayer, Neptalí Ramírez-Marcial
Assessment Of Soil Erosion Vulnerability In The Heavily Populated And Ecologically Fragile Communities In Motozintla De Mendoza, Chiapas, Mexico, Selene González-Morales, Alex Mayer, Neptalí Ramírez-Marcial
Michigan Tech Publications
Variability in physical rates and local knowledge of soil erosion was assessed across six rural communities in the Sierra Madre del Sur, Chiapas, Mexico. The average erosion rate estimated using the RUSLE model is 274 t ha-1 yr-1, with the estimated erosion rates ranging from 28 to 717 t ha-1 yr-1. These very high erosion rates are associated with high rainfall erosivity (17 000 MJ mm ha-1 h-1 yr-1) and steep slopes (mean slope Combining double low line 67 %). Many of the highest soil erosion rates are found in communities that are dominated by forestland, but where most of …
Rheological Behavior And Sensitivity Of Wood-Derived Bio-Oil Modified Asphalt Binders, Junfeng Gao, Hainian Wang, Zhanping You, Mohd Rosli Mohd Hasan, Yong Lei, Muhammad Irfan
Rheological Behavior And Sensitivity Of Wood-Derived Bio-Oil Modified Asphalt Binders, Junfeng Gao, Hainian Wang, Zhanping You, Mohd Rosli Mohd Hasan, Yong Lei, Muhammad Irfan
Michigan Tech Publications
The demand for bituminous materials is continuously growing; crude oil-based asphalt binders are non-renewable, and are facing rapid depletion. With the increase of petroleum-based asphalt prices, seeking an alternative, renewable material such as bio-asphalt has become a hot research topic. However, shortcomings in this research area have been identified, notably concerning the high-temperature performance of bio-asphalt at present. This research aims to comprehensively apply conventional tests to, and study the rheological behavior of, the high-temperature performances of bio-asphalt binders, i.e., by temperature and frequency sweeps, using a dynamic shear rheometer (DSR). It will also assess the chemical functional groups of …
Study On Components Determination And Performance Evaluation Of Ls Pre-Maintenance Agent, Yuxiang Tian, Biao Ma, Ke Tian, Ning Li, Xueyan Zhou
Study On Components Determination And Performance Evaluation Of Ls Pre-Maintenance Agent, Yuxiang Tian, Biao Ma, Ke Tian, Ning Li, Xueyan Zhou
Michigan Tech Publications
Adequate maintenance and taking active preventive measures can effectively prevent the early disease of asphalt pavements before significant damage occurs. By developing a light screening preventive maintenance agent (LS pre-maintenance agent) for strong ultraviolet (UV) radiation areas, based on the asphalt aging and regeneration mechanism, we analyzed the function and basic components and determined the optimum components ratio based on the best proportion of penetrant and solvent oil for solubility. The optimum ratio for quick-drying and long-term storage ability is the mass ratio of rock asphalt, reducing agent, penetrant, and solvent oil, which is 30:20:20:30. The light-shield agent is 5% …
Characteristics Of Moduli Decay For The Asphalt Mixture Under Different Loading Conditions, Songtao Lv, Xiyan Fan, Chengdong Xia, Jianlong Zheng, Dong Chen, Lingyun You
Characteristics Of Moduli Decay For The Asphalt Mixture Under Different Loading Conditions, Songtao Lv, Xiyan Fan, Chengdong Xia, Jianlong Zheng, Dong Chen, Lingyun You
Michigan Tech Publications
In order to explore the moduli decay patterns of asphalt mixtures under different loading conditions, the nonlinear fatigue damage model was implemented in order to simulate the moduli decay patterns. Then, the direct tensile, indirect tensile, and uniaxial compression fatigue tests were employed under four kinds of stress levels with four parallel tests. The specimens of AC-13C Styrene-butadiene-styrene (SBS) modified mixtures were manufactured. Based on the test results, the decay patterns of the moduli during fatigue tests under different stress states were revealed, and the parameters of the damage model under different test conditions were obtained. By changing the values …
Fatigue Equation Of Cement-Treated Aggregate Base Materials Under A True Stress Ratio, Songtao Lv, Chaochao Liu, Jingting Lan, Hongwei Zhang, Jianlong Zheng, Zhanping You
Fatigue Equation Of Cement-Treated Aggregate Base Materials Under A True Stress Ratio, Songtao Lv, Chaochao Liu, Jingting Lan, Hongwei Zhang, Jianlong Zheng, Zhanping You
Michigan Tech Publications
The objective of this article is to establish a fatigue equation based on the true stress ratio for cement-treated aggregate base materials. The true stress ratio herein means the ratio of the stress and the true strength of the cement-treated aggregate base materials related to loading rates and curing times. The unconfined compressive strength tests and compressive resilience modulus tests were carried out under various loading rates and curing times of 3, 7, 14, 28, 60, 90 days, respectively. According to the test results, the relationship between the unconfined compressive strength (a mix design parameter in China) and the compressive …
Advanced Paving Materials And Technologies, Zhanping You, Qingli Dai, Feipeng Xiao
Advanced Paving Materials And Technologies, Zhanping You, Qingli Dai, Feipeng Xiao
Michigan Tech Publications
No abstract provided.
Advanced Pavement Materials For Sustainable Transportation Infrastructure, Zhanping You, Meor O. Hamzah, Hainian Wang, Aboelkasim Diab, Qingli Dai
Advanced Pavement Materials For Sustainable Transportation Infrastructure, Zhanping You, Meor O. Hamzah, Hainian Wang, Aboelkasim Diab, Qingli Dai
Michigan Tech Publications
Many road managers and stakeholders are looking for more and better options for the construction and maintenance of flexible and rigid pavements. Well-designed strategies for pavement construction and maintenance have attracted the interests of researchers since a large number of existing pavements are facing deterioration all over the world. The selection and engineering properties of paving materials are crucial factors affecting the durability and therefore demanding standards of sustainability of the constructed pavement. Researchers worldwide are putting extensive efforts to develop and promote advanced pavement materials and structures for constructing and maintaining sustainable pavements. Pavement materials that can improve durability, …
Evaluation Of Well Designs To Improve Access To Safe And Clean Water In Rural Tanzania, Aminata Kilungo, Linda Powers, Nathan B. Arnold, Kelli Marie Whelan, Kurt Paterson, Dale Young
Evaluation Of Well Designs To Improve Access To Safe And Clean Water In Rural Tanzania, Aminata Kilungo, Linda Powers, Nathan B. Arnold, Kelli Marie Whelan, Kurt Paterson, Dale Young
Michigan Tech Publications
The objective of this study was to examine three well designs: drilled wells (20–30 m deep), closed dug wells (>5 m deep), and hand-dug open wells (<5 m deep), to determine the water quality for improving access to safe and clean water in rural communities. Heterotrophic plate count (HPC), total coliforms (TC), Escherichia coli (E. coli) and turbidity, were used to assess the water quality of 97 wells. Additionally, the study looked at the microflora diversity of the water, focusing on potential pathogens using outgrowth, PCR, and genome sequencing for 10 wells. Concentrations of TC for the open dug wells (4 × 104 CFU/100 mL) were higher than the drilled (2 × 103 CFU/100 mL) and closed dug wells (3 × 103 CFU/100 mL). E. coli concentration for drilled and closed dug wells was <22 MPN (most probable number)/100 mL, but higher for open wells (>154 MPN/100 mL). The drilled well turbidity (11 NTU) was within the standard deviation of the closed well (28 NTU) compared to open dug wells (49 NTU). Drilled and closed wells had similar microbial diversity. There were no …