Abstract
Chloride corrosion test was carried out in 4% NaCl solution to study the chloride corrosion resistance of rubber concrete. Rubber concrete was prepared by using 20 mesh, 1∼3 mm, and 3∼6 mm rubber particles instead of sand by 5%, 10%, 15%, and 20% of the cementitious material mass. The P-wave velocity and compressive strength of rubber concrete were measured. The microstructure of rubber concrete corroded by chloride was analyzed by SEM. The micromorphology was compared with the macrofailure characteristics under uniaxial compression. The results show that the rubber concrete was still in the early stage of erosion. With the increase of immersion time at the age of 110 days, the P-wave velocity and compressive strength of concrete were generally on the rise. Furthermore, during the period of erosion, the mechanical properties of rubber concrete increased with the increase of rubber particle size and decreased with the increase of the content. Therefore, when the rubber particle size was 3∼6 mm and the content was 5%, the antierosion performance was the best. This study has a certain guiding significance for the chloride corrosion resistance of rubber concrete.
Highlights
The demand for automobile and other industries has led to the rapid development of rubber industry, resulting in the increasing number of waste rubber in China year by year [1]. erefore, the rubber concrete prepared by mixing rubber particles into concrete provides a new way for us to deal with and apply waste rubber
Rubber material had the characteristics of superelasticity, lightweight, and incompressibility; compared with sand and stone, it has smaller hardness and lower adhesion with other materials when mixed into concrete, but the impermeability of concrete was improved when mixed with rubber particles [5]. e compressive strength of concrete would be reduced by adding rubber particles into the concrete through experimental research, which has been found by Khatib and Bayomy [6]; Wang et al [7] found that the compressive strength of concrete at low temperature would be improved by adding rubber particles into the concrete
Under the immersion of NaCl solution, chloride ion intrudes into the inner part of rubber concrete test block and reacts with the product of cement hydration, resulting in concrete damage, internal microcrack expansion, water content increase, and P-wave velocity decrease. is phenomenon is called salt solution erosion damage, which belongs to elastic loss [22]
Summary
The demand for automobile and other industries has led to the rapid development of rubber industry, resulting in the increasing number of waste rubber in China year by year [1]. erefore, the rubber concrete prepared by mixing rubber particles into concrete provides a new way for us to deal with and apply waste rubber. Yang and Jiang [20] studied the influence of random factors on the durability of structural concrete under chloride corrosion and analyzed the reliability of the service life of structural concrete. The research on chloride corrosion test of concrete was mainly in three aspects: first, through field test and micromodel to study the diffusion and transmission law of chloride ion in concrete and to predict and study its diffusion coefficient; second, to analyze the reliability of the service life of concrete in chloride environment; and third, to concrete coagulation under chloride corrosion study on the change of soil mechanical properties and durability. There were few studies on the internal damage and bearing capacity degradation of concrete mixed with rubber particles in chloride environment
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