Mechanical and Damping Properties of Recycled Aggregate Concrete Modified with Air-Entraining Agent and Polypropylene Fiber.

Chonggang Zhou,Xingwang Pei,Wenlong Li,Yijun Liu

doi:10.3390/ma13082004

Chonggang Zhou, Xingwang Pei + Show 2 more

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https://doi.org/10.3390/ma13082004

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Journal: Materials	Publication Date: Apr 24, 2020
Citations: 10	License type: CC BY 4.0

Affiliation: Xi'an University of Architecture and Technology

Abstract

In this study, recycled aggregate concrete (RAC) modified with polypropylene fiber (PP) and air-entraining agent (AGA) was prepared, and the effects of PP and AGA on the static (compressive strength, Young’s modulus, and splitting tensile strength) and dynamic properties (dynamic modulus of elasticity and damping ratio) of RAC were investigated. The experimental results showed that the addition of an AGA and PP had a favorable effect on the damping ratio of the concrete, however, the addition of the AGA had a slightly negative effect on the mechanical performance of the concrete. The AGA and PP contents required to achieve the optimum damping ratio of the concrete with the least reduction in the mechanical performance were 0.02% and 0.10%, respectively. Furthermore, the addition of AGA was more effective than that of PP in improving the damping property of the concrete.

Highlights

Concrete is the most common construction material and has been extensively used in buildings, bridges, and dams owing to the advantages of its low cost, abundant raw materials, high strength, and excellent durability [1,2]
Our results provide a deep understanding of the dynamic behavior of recycled aggregate concrete (RAC) modified with polypropylene fiber (PP) and air-entraining agent (AGA) and potentially serve as an effective tool for designing concrete with excellent damping property
5a shows the compressive strength of the reference concrete and RAC modified with PP

Summary

Introduction

Concrete is the most common construction material and has been extensively used in buildings, bridges, and dams owing to the advantages of its low cost, abundant raw materials, high strength, and excellent durability [1,2]. Aggregate accounts for approximately 60–70% of all raw materials in the concrete production [3,4,5,6]. Studies have indicated that the partial replacement of natural concrete aggregate (NCA) with RCA to prepare recycled aggregate concrete (RAC) has immense potential for practical applications [12]. RAC is composed of the original aggregate, an adhered old cement mortar, and two types of interface transition zones (ITZs) [4]. It exhibits weaker mechanical properties and lower durability than NCA due to the inferior properties of its constituents [4,12]

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