scholarly journals Waterproofing of primary lining in tunnel using nano chemicals and soil modifiers in Concrete

2021 ◽  
Vol 889 (1) ◽  
pp. 012032
Author(s):  
Ubaid Ali Parray ◽  
Harpreet Singh
Keyword(s):  
Volumetric Analysis ◽  
Engineering Industry ◽  
Engineering Properties ◽  
Concrete Technology ◽  
Hilly Terrain ◽  
Acrylic Polymers ◽  
Significant Control ◽  
Water Proofing ◽  
Primary Focus ◽  
Poor Site

Abstract The use of waterproofing chemicals in the field of concrete technology has proven a significant boom in the civil engineering industry by increasing the life of concrete structures. The materials such as nano-acrylic polymers resulted, significant control over the water leakage and damping conditions especially Terrasil and Zycobond and various nano sealers such as Zycoprime+ and Zycosil+. In this study, the primary focus is to waterproof tunnels using the various acrylic, nano-technological, and soil modifier chemicals to stabilize the tunnel structure in areas of hilly terrain. The use of these chemicals has been sourced in other areas of application but the least glance is seen in the field of tunnel engineering. These chemicals bind with the concrete and form a hydrophobic layer thus decreasing the permeability of concrete structure. In the present study the percentage of Zycobond and Terrasil used was 1.5% by weight of concrete and the ratio for Zs+:Zp+:water was 1:2:20. Tunnels especially in hilly terrain pass the flowing streams, thus making it more prone to damping conditions. So, poor site conditions result in less durability of concrete as well as steel, therefore improvement in engineering properties using these chemicals is primarily sought out in this paper. The factors considered during the use were the permeability, strength, volumetric analysis of chemicals, material properties etc. Water-proofing the concrete improves various engineering properties such as permeability, compressive strength, durability, strength, and various other properties of Concrete. The study emphasized to gauge the viability of Zycosil+ and Zycoprime+, Terrasil and Zycobond as waterproofing agents in concrete.

scholarly journals Research and Analysis on Present Situation of Desert Sand Concrete

2021 ◽  
Vol 271 ◽  
pp. 02004
Author(s):  
Ji Yanjun ◽  
Liu Chuang ◽  
Ding Zhichao
Keyword(s):  
Civil Engineering ◽  
Rapid Development ◽  
Chemical Properties ◽  
Coarse Sand ◽  
Test Methods ◽  
Engineering Industry ◽  
Unit Price ◽  
Engineering Properties ◽  
Desert Sand ◽  
Physical And Chemical

Due to the rapid development of civil engineering industry, natural medium and coarse sand resources are increasingly scarce. If desert sand is studied and applied in the field of civil engineering, the shortage of sand resources and high unit price can be greatly solved.Therefore, it is very important to study desert sand instead of ordinary sand. Although the application of desert sand in engineering has made rapid development, many engineers and researchers have done a lot of experiments and in-depth research on the physical and chemical properties, mechanical properties and compaction characteristics of desert sand, and also made a lot of experimental research results. However, at present, because of the different engineering properties, different deserts are used and the test methods are different. Generally speaking, the understanding of this special material with engineering properties is not mature at home and abroad, and it is not widely used in civil engineering.

A Review of Porous Concrete Pavement: Applications and Engineering Properties

2014 ◽  
Vol 554 ◽  
pp. 37-41 ◽  
Author(s):  
Putra Jaya Ramadhansyah ◽  
Mohd Yusak Mohd Ibrahim ◽  
Hainin Mohd Rosli ◽  
Mohd Haziman Wan Ibrahim
Keyword(s):  
Optimum Condition ◽  
Stormwater Management ◽  
Water Retention ◽  
Concrete Pavement ◽  
Engineering Properties ◽  
Concrete Pavements ◽  
Concrete Technology ◽  
Porous Concrete ◽  
Concrete Mix ◽  
Laboratory Specimen

Porous concrete technology has been used since 1970s in various parts of the United State as an option to complex drainage systems and water retention areas.Porous concrete pavements have become popular as an effective stormwater management device to control the stormwater runoff in pavement. The objective of this paper is to study a pre-review on Porous concrete pavement and it previous laboratory study. From the literature, it was found that, the strength of the porous concrete pavementstill need to improve. To improve the strength of the porous concrete, various additive have been study as a part of porous concrete mix and yetthe optimum condition to produce good porous concrete still not been established. From the previous study, it was found that to prepare the porous concrete laboratory specimen, the use of standard Proctor hammer (2.5kg) and Pneumatic press (70 kPa compaction effort) resulted in the closest properties to the field porous concrete.

Multiphase Flow in a Subsea Hilly Terrain

2018 ◽  
Author(s):  
Mohamed Odan ◽  
Faraj Ben Rajeb ◽  
Yan Zhang ◽  
Syed Imtiaz ◽  
Amer Aborig ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Chemical Engineering ◽  
Flow Behavior ◽  
Research Work ◽  
Flow Characteristics ◽  
Flow Regimes ◽  
Engineering Industry ◽  
Experimental Unit ◽  
Flow Assurance ◽  
Hilly Terrain

Multiphase flow is an important the phenomenon existing widely in nature, daily life, as well as petroleum and chemical engineering industry. It is especially important to understand the flow behavior of multiphase flow in a subsea hilly terrain and offshore pipelines. Accurate flow regime identification in multiphase flow is critical since multiphase flow affects the measurement accuracy of phase fraction, flow rate and other phase parameters. The main objective of this research work is to obtain a better understanding of the multiphase flow characteristics in a long pipeline. In this study, the results of an experimental research on multiphase flow that investigates fluid characteristics in a pipe has been presented. The experimental unit consists of pipes that are made up of clear PVC, which is capable of producing several different flow regimes (Stratified, bubble, slug, and annular-mist flow) of gas-liquid flows. The entire length of the flow loop is 20.574 m. The experimental unit includes sensors such as pressure transducers, thermocouples and flowmeters that enable to measure the pressure ranges from 20–300KPa, temperature ranges from 0 to 20 °C and volume flow ranges from 12–45 liter/min at numerous locations respectively. In this experimental work, bubble, and slug flow regimes have been selected in the multiphase flow pattern to be examined on the multiphase flow assurance. The results of this research will provide valuable new experimental data on multiphase flow characteristics for designated flow regimes that can improve flow assurance in subsea conditions by including the temperature and Pressure effects.

scholarly journals Determination of the just suspended speed for solid particle in torus reactor

2019 ◽  
Vol 80 (1) ◽  
pp. 48-58
Author(s):  
Ali Alouache ◽  
Ammar Selatnia ◽  
Abdelouhab Lefkir ◽  
Farid Halet ◽  
Houssem Eddine Sayah ◽  
...  
Keyword(s):  
Deposition Velocity ◽  
Visual Assessment ◽  
Engineering Industry ◽  
Mixing Processes ◽  
Liquid Suspension ◽  
Solid Transport ◽  
Primary Focus ◽  
Angle Method ◽  
Solid Liquid

Abstract With the considerable use of pipelines and reactors in the engineering industry, determining the deposition velocity enabling hydraulic transport is of utmost importance. This has been investigated throughout the years, scrupulously in several types of reactors used in water treatment and solid transport. The primary focus has been extended to torus reactors, due to their significant advantage in chemical, biochemical and mixing processes. In the present work, we have studied the solid-liquid suspension in a torus reactor. We elaborated an experimental method based on visual assessment SBAM (Steady Bed Angle Method), which enabled us to analytically determine the just suspended speed ‘Njs’ at which no solid remains stationary at the bed and further parametrically study the effect of several parameters including solid loadings, particle sizes and densities. The just suspended speed values obtained experimentally have been compared to a modified Zwietering's correlation.

scholarly journals Permanent Deformation and Rutting Resistance of Demolition Waste Triple Blends in Unbound Pavement Applications

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 798
Author(s):  
Farshid Maghool ◽  
Muditha Senanayake ◽  
Arul Arulrajah ◽  
Suksun Horpibulsuk
Keyword(s):  
Construction Industry ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Field Testing ◽  
Engineering Properties ◽  
Demolition Waste ◽  
Recycled Glass ◽  
Minimum Requirements ◽  
Pavement Base ◽  
Primary Focus

Virgin quarried materials are becoming increasingly scarce in our environment, and these materials are no longer a viable or economical solution for the construction industry. The construction industry is constantly seeking new markets for recycled waste in civil engineering applications. This research’s primary focus is the optimization of the usage of recycled materials such as recycled glass (RG), crushed brick (CB), and crushed concrete (CC), in pavement base/sub-base applications. Various percentages of RG, up to 40%, were blended with two types of CC in this research. The CC and CB, which were used as triple blends in this research, were utilized for the upper (100% CC) and lower sub-bases (up to 50% CB). This study sought to establish the maximum amount of RG that could be incorporated in the triple blends with CB and CC whilst maintaining an acceptable performance. Thus, a comprehensive series of fundamental and advanced geotechnical laboratory tests, including repeated load triaxial (RLT) and wheel-tracker (WT) tests, were performed to assess the engineering properties and permanent deformation characteristics of these triple blends. The particle-size distribution curve and California Bearing Ratio (CBR) values of all the blends met the minimum requirements. Results of RLT tests confirmed that all the nominated blends were found to provide the resilient modulus value required to be used as pavement materials. The WT results on the triple blend with 15% RG showed that the specimen performed exceptionally well during the test and comfortably met the requirements to be used in pavement applications. Based on the engineering properties and permanent deformation results, up to 15% RG can be suggested for incorporation as an accompanying material in unbound roadwork applications. Subject to the outcomes of future field testing, there might be potential to increase the percentage of RG added in the blends up to 30%.

What Does It Mean to Be Social? Defining the Social Landscape for Children With Childhood Apraxia of Speech

2020 ◽  
Vol 5 (4) ◽  
pp. 843-852 ◽  
Author(s):  
Nancy Tarshis ◽  
Michelle Garcia Winner ◽  
Pamela Crooke
Keyword(s):  
Social Development ◽  
Social Goals ◽  
Apraxia Of Speech ◽  
Childhood Apraxia Of Speech ◽  
Social Competencies ◽  
The Social ◽  
Social Landscape ◽  
Communication Challenges ◽  
Primary Focus ◽  
Speech Motor

Purpose What does it mean to be social? In addition, how is that different from behaving socially appropriately? The purpose of this clinical focus article is to tackle these two questions along with taking a deeper look into how communication challenges in childhood apraxia of speech impact social competencies for young children. Through the lens of early social development and social competency, this clinical focus article will explore how speech motor challenges can impact social development and what happens when young learners miss early opportunities to grow socially. While not the primary focus, the clinical focus article will touch upon lingering issues for individuals diagnosed with childhood apraxia of speech as they enter the school-aged years. Conclusion Finally, it will address some foundational aspects of intervention and offer ideas and suggestions for structuring therapy to address both speech and social goals.

Audiology Service Models in a Family Physician Practice Setting

2010 ◽  
Vol 6 (1) ◽  
pp. 24-32 ◽  
Author(s):  
Sridhar Krishnamurti
Keyword(s):  
Pediatric Patients ◽  
Practice Patterns ◽  
Healthcare Delivery ◽  
Direct Consequence ◽  
Direct Access ◽  
Practice Setting ◽  
Pediatric Populations ◽  
Family Practice Physicians ◽  
Primary Focus ◽  
Balance Problems

This article illustrates the potential of placing audiology services in a family physician’s practice setting to increase referrals of geriatric and pediatric patients to audiologists. The primary focus of family practice physicians is the diagnosis/intervention of critical systemic disorders (e.g., cardiovascular disease, diabetes, cancer). Hence concurrent hearing/balance disorders are likely to be overshadowed in such patients. If audiologists get referrals from these physicians and have direct access to diagnose and manage concurrent hearing/balance problems in these patients, successful audiology practice patterns will emerge, and there will be increased visibility and profitability of audiological services. As a direct consequence, audiological services will move into the mainstream of healthcare delivery, and the profession of audiology will move further towards its goals of early detection and intervention for hearing and balance problems in geriatric and pediatric populations.

Rate of Acoustic Neuroma Growth by Volumetric Analysis Preradiation Does Not Predict Treatment Failure

2019 ◽  
Author(s):  
Angela Richardson ◽  
David Mccarthy ◽  
Simon Menaker ◽  
Nagy Elsayyad ◽  
Christine Dinh ◽  
...  
Keyword(s):  
Treatment Failure ◽  
Acoustic Neuroma ◽  
Volumetric Analysis ◽  
Predict Treatment Failure

What’s Good for George Sánchez Is Good for Boyle Heights: Regenerative Scholarship, Urban Racism, Gentrification, and East LA Interchange

2017 ◽  
Vol 4 (2) ◽  
Author(s):  
Gilbert Estrada
Keyword(s):  
Working Class ◽  
Urban Pollution ◽  
Metropolitan Regions ◽  
The Past ◽  
Award Winning ◽  
Boyle Heights ◽  
Good For ◽  
Primary Focus ◽  
Deed Restrictions ◽  
Class Community

The inclusive ideals of George Sánchez have helped shape a new generation of academics who have promoted connections with nonacademic organizations. This article discusses how Sánchez has continued these efforts through his pivotal contributions to an award-winning documentary focusing on the multiethnic, working-class community of Boyle Heights: Betsy Kalin’s film East LA Interchange (2015). East LA Interchange’s greatest contribution to the generative scholarship Sánchez emphasizes is its critical analysis of modern urban problems, utilizing history as a tool for social change. The story of Boyle Heights is not just a history of a single working-class community with a diverse culture. It is also a tale of a neighborhood trying to solve real world problems such as gentrification, unaffordable housing, community displacement, and urban pollution. The film portrays these difficulties in the present while showing that they originated decades ago. Sánchez and East LA Interchange are at their best when they provide the historical contexts of contemporary problems, emphasizing that history is not only the study of the past. Rather, history is the unending dialogue between the past, present, and future, and any significant discourse on today’s urban ills must be rooted in the past. For students and others interested in the diverse communities common in many US metropolitan regions, East LA Interchange has much to offer regarding the issues of immigration, redlining, deed restrictions, political activism, freeway construction, living with racially and ethnically diverse community members, and the nationwide problem of gentrification. These themes, especially gentrification, are the primary focus of this article.

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