Mechanical Properties and Freeze–Thaw Durability of Basalt Fiber Reactive Powder Concrete

Xin Gao,Bing Zhu,Chunyu Liang,Hanbing Liu,Wenjun Li,Xiang Lyu

doi:10.3390/app10165682

Xin Gao, Bing Zhu + Show 4 more

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https://doi.org/10.3390/app10165682

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Journal: Applied Sciences	Publication Date: Aug 16, 2020
Citations: 29	License type: CC BY 4.0

Affiliation: Jilin University

Abstract

Basalt fiber has a great advantage on the mechanical properties and durability of reactive powder concrete (RPC) because of its superior mechanical properties and chemical corrosion resistance. In this paper, basalt fiber was adopted to modified RPC, and plain reactive powder concrete (PRPC), basalt fiber reactive powder concrete (BFRPC) and steel fiber reactive powder concrete (SFRPC) were prepared. The mechanical properties and freeze–thaw durability of BFRPC with different basalt fiber contents were tested and compared with PRPC and SFRPC to investigate the effects of basalt fiber contents and fiber type on the mechanical properties and freeze–thaw durability of RPC. Besides, the mass loss rate and compressive strength loss rate of RPC under two freeze–thaw conditions (fresh-water freeze–thaw and chloride-salt freeze–thaw) were tested to evaluate the effects of freeze–thaw conditions on the freeze–thaw durability of RPC. The experiment results showed that the mechanical properties and freeze–thaw resistance of RPC increased as the basalt fiber content increase. Compared with the fresh-water freeze–thaw cycle, the damage of the chloride-salt freeze–thaw cycle on RPC was great. Based on the freeze–thaw experiment results, it was found that SFRPC was sensitive to the corrosion of chloride salts and compared with the steel fiber, the improvement of basalt fiber on the freeze–thaw resistance of RPC was great.

Highlights

In the practical application of concrete structural engineering, the deterioration of concrete and the shortening of its service life are related to freeze–thaw damage, chloride ion penetration, sulfate attack and carbonization [1,2]
The purpose of this paper is to provide a reference for the practical application of basalt fiber reactive powder concrete (BFRPC) in cold regions
MR refers to the mass rate, to Mievaluate refers tothe theeffects mass at Nthfiber cycles, M0 refers to thetype initial and compared with of the basalt contents and fiber on mass, CR refersproperties to the compressive the mechanical of reactive powder concrete (RPC). strength loss rate, fci refers to the compressive strength at the

Summary

Introduction

In the practical application of concrete structural engineering, the deterioration of concrete and the shortening of its service life are related to freeze–thaw damage, chloride ion penetration, sulfate attack and carbonization [1,2]. It is important to improve the durability of concrete structures in practical applications, which is a crucial factor to reduce the cost of infrastructure construction and maintenance. Most concrete structures appear in the natural environment, and the freeze–thaw cycle reduces the service life and becomes one of the main sources of damage to the concrete structure [3]. In cold areas, where de-icing salt has been adopted, the concrete damage caused by the coupling action of chloride corrosion and freeze–thaw cycle is serious [4]. The durability of concrete is closely related to the internal pore structure. The compact concrete structure could hinder the transmission of chloride and greatly reduce the damage caused by chloride ion penetration [6,7]

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