Pakjira Aosai

ORCID: 0000-0003-0022-2626
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About
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Research Areas
  • Structural Behavior of Reinforced Concrete
  • Innovative concrete reinforcement materials
  • Recycled Aggregate Concrete Performance
  • Innovations in Concrete and Construction Materials
  • Fire effects on concrete materials
  • Structural Load-Bearing Analysis
  • Concrete Corrosion and Durability
  • Concrete Properties and Behavior
  • Water Quality Monitoring Technologies
  • Sports injuries and prevention
  • Concrete and Cement Materials Research
  • Geotechnical Engineering and Soil Stabilization
  • Seismic Performance and Analysis
  • Mechanics and Biomechanics Studies
  • Sports Dynamics and Biomechanics
  • Asphalt Pavement Performance Evaluation

Walailak University
2022-2024

Current design guidelines for reinforced concrete (RC) beams with Fibre Reinforced Polymer (FRP) bars neglect shear and crack-induced deflections in the calculation of total deflections. However, can be up to 25 % FRP RC thus they need considered calculations. At same time, use Recycled Aggregate Concrete (RAC) steel fibres is becoming more common construction, but limited research has examined RAC fibres. This article proposes a new approach (based on Eurocode 2) calculate accurately To...

10.1016/j.engstruct.2024.118247 article EN cc-by Engineering Structures 2024-05-25

Abstract Exterior beam-column joints are the most vulnerable part of substandard reinforced concrete (RC) buildings and often first to be damaged during earthquakes. This article presents an experimental numerical investigation into behaviour exterior RC repaired strengthened using Post-Tensioned Metal Straps (PTMS) for active confinement. The study focused on full-scale with inadequate core zone detailing, thus emulating deficiencies found in existing buildings. Initially, four “bare” were...

10.1007/s10518-024-01904-1 article EN cc-by Bulletin of Earthquake Engineering 2024-03-29

Nanoparticles are one of the effective methodologies implemented in concrete technology. The main objective this research is to study influence nano alumina with different percentage variations ranging from 1% 3% along incorporation PVA fibers. From mechanical properties test, optimum dosage was determined further durability behavior. This work also investigates hybridization two nanoparticles such as silica (NS) and (NA). results show that increasing quantity NA reduces compressive strength...

10.3390/fib12070054 article EN cc-by Fibers 2024-06-26

This study investigates experimentally, numerically, and analytically the performance of different string materials (Kevlar, synthetic gut, natural polyester) on badminton racquets. Vibration impact tests with a shuttlecock were performed using racquet frame made carbon graphite mixed epoxy resin. Different tensions considered in (20, 22, 24, 28, 30, 34 lb), as well hitting locations frame. The results show that, diameter strings increased, elasticity decreased from 0.529 to 0.447 for...

10.3390/s23135957 article EN cc-by Sensors 2023-06-27

This article presents a case study on the structural assessment of reinforced concrete (RC) foundation exposed to low temperatures. The supports 19,500 m³-capacity tank with low-temperature (-89°C) ethane. Icing and bubbling were observed tank’s surface soon after it started operations. Condensation was also at bottom 0.8 m-depth RC slab, which raised concerns about condition concrete. provides details field analytical investigations conducted assess foundation....

10.20944/preprints202205.0195.v1 preprint EN 2022-05-16

This article presents a case study on the thermal assessment of reinforced concrete (RC) foundation exposed to low temperatures. The supports 19,500 m3-capacity tank with low-temperature (−89 °C) ethane. Icing and bubbling were observed tank’s surface soon after it started operations. Condensation was also at bottom 0.8-m-depth RC slab, which raised concerns about structural condition concrete. provides details field analytical investigations conducted assess foundation. Heat transfer finite...

10.3390/buildings12070889 article EN cc-by Buildings 2022-06-23
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