Principal Investigator

Asst. Prof. Dr. Pansuk Withit
Chulalongkorn University (CU), Thailand

ASEAN Co-Investigator

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Japanese Co-Investigator

Assoc. Prof. Dr. Nobuhiko NAKANO
The University of Tokyo

Awarded year

2016

Program

Collaborative Research Program with Industry (CRI)

Field

Civil Engineering

Abstract

“The ultimate goal of this project is to develop mechanisms for collaborations among academia and industry in order to apply developed techniques and innovations for precast concrete construction. Since Thailand is the focal point for education and research via AUN/SEED-Net activities, the mechanisms can be expanded to the region. To study the efficiency and improve the performance of joints in precast concrete construction, the following objectives are to be achieved in the project: 1. Water leak: 1) To evaluate the performance of waterstops and crack inducer installed into Thai materials (concrete and reinforcing steel) with Thai construction skills and design method. 2) To study the adhesion between the modified/reclaimed natural rubber and the fresh concrete. 3) To evaluate the performance of butyl rubber as waterproof in precast concrete connection. 2. Cracking of joints: 1) To evaluate the cracking characteristic of grouting materials of precast concrete joints in term of detailing design and construction process. 2) To propose the new grouting materials with the confirmed performance from the experiment. 3) To propose the improved detailing design and construction process. 3. New design: 1) To evaluate the performance of newly designed precast joints by in-plane direct shear test, bending test and out-of-plane direct shear test. 2) To validate and calibrate the analytical results from Rigid Body Spring Model (RBSM) analyzed by comparing the analytical results to the results from actual experiment. 3) To modify the new design of precast joints by the parametric study by RBSM. 4. Fire resistance: 1) To conduct a comprehensive literature review on the precast concrete joints on the material and structural level. This review involves topics about concrete in general, composition of grouting materials, different curing regimes, fire effects and fire tests on concrete. 2) To cast material specimens as initial tests to obtain material properties of grouting materials and curing regimen. 3) To undertake fire resistance experiments on precast concrete panels with varying embedded steel and grouting material content. 4) To evaluate the fire resisting performance of precast joints in elevated temperature focusing on spalling depths and residual strength. 5. Explosive resistance: 1) To investigate the improvement in performance of precast panel in resisting blast load after inclusion of Hooked-type (H) steel fiber into the cementitious matrix. The investigation is done by simulating the responses of concrete panels subjected to blast load with numerical finite element code ABAQUS. 2) To validate and calibrate the analytical results from finite element program by comparing the analytical results to the results from actual experiment as well as past experiment. 3) Utilization of steel fiber reinforced concrete properties in improving the performance of structure subjected to blast load.”

Project at glance

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