Influence of Reinforcement Bars on Concrete Pore Structure and Compressive Strength.

Jianmin Hua,Lepeng Huang,Zhuolin Xie,Yemeng Xu,Zengshun Chen,Fengbin Zhou

doi:10.3390/ma13030658

Abstract

In this research, the influence of reinforcement bars on concrete pore structure and compressive strength was experimentally investigated. Concrete samples with two mixture ratios and nine reinforcement ratios were provided. Tests were conducted on concrete pore structure and compressive strength at three ages (3 d, 7 d, and 28 d). It was found that reinforcement bars changed the concrete pore structure. In terms of size, the pore structure of concrete increased with the increase of reinforcement ratio. At the same age, concrete compressive strength in reinforced concrete specimens saw a gradual reduction when reinforcement ratio increased. A formula was proposed to calculate the compressive strength of concrete in reinforced specimens according to the strength of unreinforced concrete.

Highlights

Concrete is a cement-based material, whose strength is affected by pores and microcracks, especially under the action of thermal loads [1,2,3,4,5]
Acetone was applied of 0%, 1.14%, 3.24%, and 6.56% at different ages, and shows that the size of concrete pore structure togradually prevent concrete andage a vacuum dryer wasmixing used toand dry reinforcement the samples
Structure wasand tested by an pore automatic mercury porosimeter that has an aperture measurement the average median diameters, critical diameter, and porosity of C30-R0 concreterange after 3ofd

Summary

Introduction

Concrete is a cement-based material, whose strength is affected by pores and microcracks, especially under the action of thermal loads [1,2,3,4,5]. Extensive research was carried out to probe into the relationship between concrete pore structure and compressive strength. Li et al [6] studied the connection between concrete strength and pore structure by introducing an influencing coefficient of pore size. Huang et al [7] established an expression to calculate concrete compressive strength according to the relative specific surface area of pore structure. Lian et al [8] investigated the association between concrete pore structure and compressive strength. Gao et al [9] prepared defective specimens by adding air-entraining agents to concrete, and studied the influence of pore structure on concrete strength. It was generally found that concrete strength was higher for a denser pore structure [6,7,8,9,10,11,12]

Methods

Results

Discussion

Conclusion