Core Competencies in Vocational Welder Worker: Based on Thai Welding Industry Participator Perceptions

Abstract: A core competency facilitates the identification of training needs and guides the design of a professional development program. Thus, this research was to explore and examine the core competencies in vocational welder worker based on Thai welding industry participator perceptions. To synthesize core competencies first used the focus group technique with 17 experts to identify their perspectives on core competencies in vocational welder worker. After that competencies questionnaire survey was developed to collect data from a participator sample consist of , 206 welding industry participators. Research methods were applied to collect quantitative data using questionnaires, forms, interviews, discussion groups and workshops. The resulting analysis revealed that the main elements of the competencies in vocational welder worker could be divided into three core competencies categories, namely: 1) The knowledge and skills generally: Basic skills and Information technology skills 2) The knowledge and skills specific: Process of connection and control, Welding process design, Metal structuring, The selection of proper welding process, Welding control, Inspection and testing process piece, Drawing and design product, Handmade sheet metal product, Produce and control manufacturing, and Pipe installation 3) The attitude: Personalities and human relation

Bond between glulam and NSM CFRP laminates

With the aim of evaluating the bond behaviour between glulam and carbon fibre reinforced polymer laminates strips, an experimental program using pull-out tests was carried, when the near-surface strengthening technique is applied. Two main variables were studied: the bond length and the type of pull-out test configuration. The instrumentation included the loaded and free-end slips, as well as the pull-out force. Based on the obtained experimental results, and applying an analytical-numerical strategy, the local bond stress-slip relationship was determined. In this work the tests are described, the obtained results are presented and analysed, and the applicability of an inverse analysis to obtain the local bond law is demonstrated.This work is supported by FEDER funds through the Operational Programme for Competitiveness Factors - COMPETE and National Funds through FCT - Portuguese Foundation for Science and Technology under the project PTDC/ECM/74337/2006. The authors also like to thank all the companies that have been involved supporting and contributing for the development of this study, mainly: S&P Clever Reinforcement Iberica Lda., Portilame, MAPEI and Rothoblaas

Assessment of GFRP bond behaviour for the design of sustainable reinforced seawater concrete structures

Freshwater is an increasingly scarce resource. Its use in the production of concrete is one important contributor to its fast depletion. Alternatively, the use of seawater for reinforced concrete production, combined with the use of glass fibre reinforced polymers (GFRP) as reinforcement, may represent an interesting solution to increase concrete sustainability. The objective of this paper is to explore this promising solution through the development of concrete compositions with seawater. Additionally, it is also an objective to assess the bond behaviour between GFRP rods and concrete, in a design perspective. The influence of concrete age, rod diameter and anchorage length were also investigated. An analytical model capable of determining the local bond stress-slip laws was used. Results demonstrated that the use of seawater had no relevant effects on neither concrete mechanical properties nor bond behaviour.The study presented in this paper is a part of the research project “NEXT-SEA: Next Generation Monitoring of Coastal Systems in a Scenario of Global Change”, financed by CCDRN and FEDER funds in the scope of the Next-sea project (NORTE-01-0145-FEDER-000032). The authors acknowledge all the companies that have been involved supporting and contributing for the development of this study, mainly: S&P Clever Reinforcement Ibérica Lda., Burgoparaíso – Unipessoal Lda., Secil, Sika Portugal – Produtos Construção e Indústria S.A. The first and the last authors wishes also to acknowledge the grants SFRH/BD/131913/2017 and SFRH/BSAB/150266/2019, respectively, provided by FCT, financed by European Social Fund and by national funds through the FCT/MCTES

Development of high performance fiber -reinforced cement composites using twisted polygonal steel fibers.

The ultimate goal of this research is to develop high performance fiber reinforced cement composites (HPFRCCs) using a new type of deformed steel fibers with an optimized geometry, identified as twisted polygonal steel fibers or Torex fibers. The research is divided into three parts: evaluating the components of bond in Torex fibers, optimizing the composite response of cement composites reinforced with Torex fibers, and modeling the pullout load versus slip response of Torex fibers. The parameters investigated in the first part include the fiber geometry, embedded length, fiber strength, matrix strength, interfacial properties, and fiber inclination. When the proper combination of these parameters is used, Torex fibers exhibit a pseudo-plastic pullout load versus slip behavior, that is a high pullout load is maintained almost constant up to complete pullout. In the second part, cement composites reinforced with Torex fibers are investigated experimentally in tension and bending. Test parameters include fiber volume fraction, L/de ratio and matrix compressive strength. The use of Torex fibers led to quasi-strain hardening and multiple cracking behavior, and induced a significantly higher strength and ductility in tension and bending than that of commercial steel fibers. The concept of hybridization with micro and macro fibers was also explored in this part of the study to further improve composite performance. Hybrid fiber reinforced composites presented improvement not only in tension and bending but in higher ductility and energy absorption capacity. A micromechanical model is developed in the third part to predict the pullout load versus slip response of Torex fibers embedded in a cement matrix. The total pullout load comprises two main components of bond: frictional bond (adhesion if any), and mechanical bond. However, both components of bond are modeled using the Coulomb's friction law, because mechanical bond is based on the concept of untwisting (thus sliding) torque distribution along the fiber developed during pullout. An extensive parametric analysis is carried out to better understand and optimize the components of bond in Torex fibers. Model predictions showed good agreement with the experimental data. In summary, this research contributes to the development of HPFRCCs with improved performance.Ph.D.Applied SciencesCivil engineeringMechanical engineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/130633/2/3042176.pd

ตัวแปรที่ส่งผลต่อการยึดหน่วงแบบเฉือนตรงระหว่างคอนกรีตเดิมกับคอนกรีตใหม่ Parameters Affecting Direct Shear Bond between Existing Concrete and New Concrete

การเชื่อมประสานคอนกรีตใหม่บนคอนกรีตเดิมสำหรับการซ่อมแซมหรือการเสริมกำลังโครงสร้างจะต้องคำนึงถึงการถ่ายแรงต่าง ๆ ที่เกิดขึ้นที่จุดต่อ การส่งถ่ายแรงที่สำคัญอย่างหนึ่งคือแรงเฉือนที่จุดต่อซึ่งขึ้นอยู่กับหลายตัวแปร งานวิจัยนี้เป็นการศึกษาตัวแปรที่ส่งผลต่อการยึดหน่วงแบบเฉือนตรงระหว่างคอนกรีตเดิมกับคอนกรีตใหม่ ตัวอย่างที่ใช้ในการทดสอบเป็นคอนกรีตรูปทรงกระบอกขนาดเส้นผ่านศูนย์กลาง 150 มิลลิเมตร ยาว 300 มิลลิเมตร โดยคอนกรีตเดิมกับคอนกรีตใหม่ได้ถูกเชื่อมต่อกันที่ช่วงกลางของตัวอย่าง ตัวแปรที่ใช้ในการศึกษาได้แก่ (1) ความหยาบของผิวคอนกรีตเดิม 3 แบบ ได้แก่ ผิวเรียบ ผิวหยาบน้อย และผิวหยาบมาก (2) คอนกรีตใหม่ที่ใช้มี 2 แบบ คือ คอนกรีตล้วนและคอนกรีตเสริมเส้นใยเหล็ก (3) กำลังอัดคอนกรีต และ (4) การติดตั้งอุปกรณ์ฝังยึดที่จุดต่อ จากผลการศึกษาพบว่า ผิวคอนกรีตเดิมที่มีความหยาบมากขึ้นจะให้แรงยึดหน่วงแบบเฉือนตรงและการดูดซับพลังงานมีค่าเพิ่มขี้นอย่างมาก การใช้เส้นใยเหล็กและการเพิ่มกำลังอัดในคอนกรีตใหม่จะช่วยเพิ่มกำลังยึดหน่วงแบบเฉือนตรง การเคลื่อนตัว และการดูดซับพลังงานเล็กน้อย โดยการใช้คอนกรีตเสริมเส้นใยเหล็กและเททับบนผิวคอนกรีตเดิมที่มีความหยาบมากจะเพิ่มกำลังยึดหน่วงประมาณร้อยละ 2.28 ทั้งนี้อาจเกิดจากเส้นใยเหล็กช่วยเพิ่มการขัดกันระหว่างผิวสัมผัสทั้งสอง นอกจากนี้ การติดตั้งอุปกรณ์ฝังยึดที่จุดต่อจะช่วยเพิ่มขึ้นกำลังยึดหน่วงและการเคลื่อนตัวอย่างชัดเจน โดยเพิ่มขึ้นที่ร้อยละ 54.58 และ 165.93 ตามลำดับ สุดท้ายนี้ จากการวิเคราะห์ทางสถิติโดยวิธีถดถ้อยเชิงพหุคูณได้พบว่า ตัวแปรที่ส่งผลต่อการยึดหน่วงแบบเฉือนตรงอย่างมีนัยสำคัญ 0.05 ได้แก่ ความหยาบของผิวคอนกรีตเดิม และการติดตั้งอุปกรณ์ฝังยึดที่จุดต่อ และสมการที่ใช้ทำนายผลการทดสอบมีความสอดคล้องอย่างดีกับผลที่ได้รับจากการทดสอบ โดยให้ค่า R2 = 0.9539 และ F = 28.9824The bonding of new concrete on existing concrete for repair or strengthening of structures must consider the various transferring forces that occurred at the joint. One of the important transferring forces is a shear force at the joint which depends on various parameters. This research is to study the parameters affecting the directshear bond between existing concrete and new concrete. Thesamples used for the test were a cylindrical shape with 150 mm in diameter and 300 mm in length. The existing concrete and the new concrete were connected in the middle of the sample. The parameters of this study were: (1) three different surface roughness of existing concrete, i.e. smooth, slightly rough, and very rough surface; (2) two types of new concrete, i.e. plain concrete and steel fiber reinforced concrete; (3) compressive strengths of concrete; and (4) installation of a chemical anchor at the joint. The results were found that the increase in surface roughness of the existing concrete increasedsignificantly the direct shear bond and energy absorption. The use of steel fiber and higher compressive strength in new concrete would increase slightly the bond strength and its displacement as well as energy absorption. The use of steel fiber reinforced concrete and cast in existing concrete having a very rough surface would increase bond strength by about 2.28%. This might be caused by steel fibers increasing the locking at the interface, In addition,the installation of a chemical anchor at the interface would increase significantly the bond strength and its displacement at 55% and 166%, respectively. Finally, the statistical analysis by using Multiple Linear Regression was found that the parameters affecting directshear bond with 0.05 significance were surface roughness of existing concrete and installation of a chemical anchor at the joint. The equation used to predict the test results were consistent with the results obtained from the test with R2 = 0.9539 and F = 28.9824.Keywords: คอนกรีตเดิม; คอนกรีตใหม่; จุดต่อ; เส้นใยเหล็ก; อุปกรณ์ฝังยึดเคมี; Existing Concrete; New Concrete; Joint; Steel Fiber; Chemical Ancho

The influence of ability beliefs and motivational orientation on the self-efficacy of high school science students in Thailand

This study investigated the influence of entity beliefs, gender stereotypes and motivational goals on participants’ self-efficacy in biology and physics and their career aspirations. Participants (n = 2638, males 46% and females 54%) were students enrolled in Years 10–12 of the academic science–maths stream in Thailand. Entity beliefs were endorsed significantly more by males than by females, while gender stereotypes were endorsed significantly more by females than by males. Entity beliefs were found to be significantly and positively associated with performance avoidance goals towards science. Multiple regression analysis found a negative influence of performance avoidance goals and a positive influence of mastery goals on males’ and females’ self-efficacy in physics and biology and their career aspirations. The stereotype ‘males are better in physics’ had a positive influence on the measure of self-efficacy of males in physics studies and a negative influence on the self-efficacy of females. The stereotype ‘females are better in biology’ had no influence on the measure of self-efficacy in biology studies for either males or females. Our results support a view of subject-specific inquiry as more revealing than global inquiry for the investigation of gender differences in achievement-related beliefs

Competencies Framework for Civil Engineer in Thailand

Abstract: The civil engineering industry now faces with many problems such as poorly planned projects, breach of the delivery date, erroneous budget estimation, uncontrolled system functionality changes, and inappropriate documentation that all lead to the dissatisfaction of clients. One of the main concerns of civil engineering industry is to develop the talent of its human resources, since the quality and innovation of its products and services depend to a great extent on the knowledge, the ability and the talent that civil engineers apply in the development process. A competency framework defines a set of knowledge, skills, and behaviors that professionals must have to excel in their careers. A competency framework facilitates the identification of training needs and guides the design of a professional development program. In this paper we propose a competency framework for civil engineers, whose design is based on the activities and interactions that they perform during the civil development process. Thus, competency framework for civil engineers defines a set of knowledge, abilities and key behaviors, with special emphasis in the soft skills. The organization that adopts this framework must define and integrate the specific competencies needed by for civil engineers to allow them to fulfill their goals

การผลิตแผ่นฝ้าเพดาน T-Bar ทำจากส่วนโคนของลำต้นสบู่ดำ

รายงานวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2555The objective of this research is to produce the T- BAR plate from the agriculture process’s waste. The researcher brought physic nut plant to produce T- BAR plate forint prior building. It was tested based on Thailand industrial standard (TIS 876-2547)which are , Determination of moisture content, density, absorption and expansion when soak in water .For cohesion and perpendicular surface tension and tested for flexural resistance and modulus of elasticity The results show that suitable size material should not thicker than 2 centimeters. The experiment of ratio between physic nut plant and phenol cyanide resin at 90:10 and 92:8. The researcher found that suitable proportion are 92%physic nut pant with 8%phenol cyanide resin. The temperature used for compression was 120 C. The appropriate density to the compression plate was 0.80 g/cm.3 The moisture content of materials before compression was at 8.89% average. The suitable compression was 150 lb/in². The moisture content was at 7.65%, The density is at 0.818 g/cm.3expansion value when soaked in water for 2 hours was at 8.02%, water absorption retain 2 hour is at 14.23%, Inner bond is at 0.56 MPa. Flexibility is at 21.45 MPa., mordulus 2116MPa.Which the result of tested with the Thailand industrial standard (TIS 876-2547).The experiment concluded that we can used physic nut plant as material to make T- BAR plate for interior building.Rajamangala University of Technology Phra Nakho