Experimental Study and Simulation Calculation of the Chloride Resistance of Concrete under Multiple Factors

Yang Ding,Shuang-Xi Zhou,Yong-Qi Wei,Zhong-Ping Wang,Tong-Lin Yang,Hui Liu,An-Ming She,Jing-Liang Dong,Zhen Han

doi:10.3390/app11125322

Abstract

Cement is widely used in marine concrete, and its resistance to chloride ion corrosion has been widely considered. In this paper, based on a laboratory test, the influence of different hydrostatic pressures, coarse aggregate contents and w/c ratios on the chloride resistance performance is analyzed. Based on COMSOL finite element software, a two-dimensional cementitious materials model is established, and the simulation results are compared with the experimental results. The results show that the penetration depth of chloride ions in cement increases with the increase of the w/c ratio. Under the hydrostatic pressure of 0 MPa, when the w/c ratio is 0.35, the penetration depth of chloride ions is 7.4 mm, and the simulation result is 8.0 mm. When the w/c ratio is 0.45, the penetration depth of chloride ions is 9.3 mm, and the simulation result is 9.9 mm. When the w/c ratio is 0.55, the penetration depth of chloride ions is 12.9 mm, and the simulation result is 12.1 mm. Under different hydrostatic pressures, the penetration depth of chloride ions obviously changes, and with the increase in hydrostatic pressure, the penetration depth of chloride ions deepens. Under the w/c ratio of 0.35, when the hydrostatic pressure is 0.5 MPa, the penetration depth of chloride ions is 11.3 mm, and the simulation result is 12.1 mm. When the hydrostatic pressure is 1.0 MPa, the penetration depth of chloride ions is 16.2 mm, and the simulation result is 17.5 mm.

Highlights

The durability life of a cement structure refers to the whole process from the construction of a cement structure to the destruction of a cement structure [1,2,3,4]
This paper studied the chloride diffusion performance of concrete with different w/c ratios and different aggregate contents under different hydrostatic pressures based on COMSOL finite element software and compared the simulation results with the experimental results to verify the effectiveness of the simulation method
This paper studied the chloride diffusion performance of concrete with different w/c ratios and different aggregate contents under different hydrostatic pressures based on COMSOL finite element software, and it compared the simulation results with the experimental results to verify the effectiveness of the simulation method

Summary

Introduction

The durability life of a cement structure refers to the whole process from the construction of a cement structure to the destruction of a cement structure [1,2,3,4]. The transmission process of chloride ions in cement is mainly through the connected pores of the cement [9,10,11,12,13]. This process is restricted by the changes of the cement’s own composition, structure and performance, but it is affected by the external service environment of the cement, which makes the transmission mechanism of chloride ions in cement extremely complex [13,14,15,16]. The cement of buildings is affected by the hydrostatic pressure field at the same time, forming a multi-field coupling environment, which makes the chloride ion transport mechanism in this environment worthy of further discussion [23,24,25,26,27]

Methods

Results

Conclusion