NEXCEL Ph.D student Liu Jiarong gave a presentation in "ACF 10th Conference"

Time: 2024/08/28 Publisher： oiginal Views：

Introduction

From August 15 to 18, 2024, the 10th Conference of the Asian Concrete Federation (ACF 10th Conference) was held in Ulaanbaatar, Mongolia. The event attracted over 316 representatives from academia and industry across 12 countries. The theme of the conference was "Durability and Sustainability in Concrete Materials and Structures."

Liu Jiarong, Ph.D student from Zhejiang University and the principal investigator of NEXCEL 2024 Ph.D project titled "Research on Multifunctional Carbon Fabric Reinforced Seawater Sea-sand Concrete Composite Member System", gave a presentation titled "Electrical Conductivity and Piezoresistive Response of CFRCM with ICCP".

In remote and coastal areas, the scarcity of river sand significantly limits the development of concrete engineering. Therefore, exploring the feasibility of using abundant seawater sea-sand as a substitute for freshwater river sand is worthwhile. However, the chloride ions present in seawater sea-sand can lead to the corrosion of steel bars. Additionally, the mechanical and durability performance of reinforced concrete structures can be significantly affected over their long-term service life. Therefore, it is crucial to find ways to delay steel bars corrosion, enhance structural load-bearing capacity, implement structural health monitoring to extend the service life of structures, and prevent sudden structural failures.

This study explores solutions to the aforementioned issues by using Carbon Fabric Reinforced Cementitious Matrix (CFRCM). The types of mortar include both freshwater river sand mortar and seawater sea-sand mortar. Through accelerated polarization tests and tensile tests on CFRCM plates, the study investigated the effect of impressed current on the tensile mechanical properties of CFRCM plates. By monitoring the changes in resistance during loading, the study analyzed the piezoresistive effect of the two types of CFRCM plates with and without the ICCP (Impressed Current Cathodic Protection) system, inferring the locations and development sequences of cracks.

The research leverages the dual functionalities of carbon fiber reinforcement and sensing, advancing the development of a three-functional system that integrates impressed current cathodic protection, structural strenthening, and structural health monitoring (ICCP-SS-SHM). Additionally, there is little difference in tensile performance between the two types of CFRCM. Therefore, in the application of the three-functional system, seawater sea-sand has potential to partially replace freshwater river sand in the future.

At the conference, Ph.D student Liu Jiarong provided a detailed overview of the effect of ICCP on the mechanical properties, electrical conductivity, and piezoresistive effect of CFRCM. Liu also presented future research prospects and engaged actively with scholars, receiving unanimous recognition from the attending researchers.