Petrographic and Mechanical Characteristics of Concrete Produced by Different Type of Recycled Materials

Petros Petrounias,Ioannis Rigopoulos,Konstantin Hatzipanagiotou,Panagiota P Giannakopoulou,Paraskevi Lampropoulou,Aikaterini Rogkala,Basilios Tsikouras

doi:10.3390/geosciences9060264

Petros Petrounias, Ioannis Rigopoulos + Show 5 more

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https://doi.org/10.3390/geosciences9060264

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Abstract

This paper examined three different types of recycled materials, such as beer green glass, waste tile, and asphalt, which will be used in different mixtures in order to prepare concrete specimens and, more specifically, their effect on concrete strength and how the petrographic characteristics of various recycled materials influenced the durability of C25/30 strength class concrete. Particular emphasis was placed on the effect of artificial microroughness of glassy and smooth surfaces of recycled materials on their final concrete strength. The concrete strength values do not show great variance, but their limited differences have been qualitatively interpreted by a new promising petrographic methodology, including the study of the surface texture of the used aggregate materials. Concretes are produced with constant volume proportions, workability, mixing, and curing conditions while using different sizes of each aggregate type. The aggregates were mixed both in dry and water saturated states in concretes. Concretes that are made by a mixture of beer green glass with quartz primer, as well as of tile with quartz primer, presented the optimum possible results of the compressive strength.

Highlights

Concrete, a mixture of cement, aggregates, and water, is the most used man-made material and it has numerous civil engineering applications, including roads, bridges, and dams [1,2,3,4]
An artificial increase of microroughness of the recycled materials specimens was carried out, since the microroughness of materials used as aggregates in concretes plays severe role on their final strength, as it is responsible for the adequate bonding between the cement paste and the aggregate particle
The recycled materials were crushed through standard sieves and separated into the size classes of 2.00–4.75, 4.45–9.5, and 9.5–19.1 mm, and washed before their used in concrete specimens

Summary

Introduction

A mixture of cement, aggregates, and water, is the most used man-made material and it has numerous civil engineering applications, including roads, bridges, and dams [1,2,3,4]. The basic component of concrete is the material that binds the aggregate particles together, commonly comprising a mixture of cement and water [1,5,6]. Several researchers have studied the effect of various additives, such as fly ash, low calcium fly ash, coal fly ash, ZnO nanoparticles, carbon nano tubes, and polypropylene fibers on the quality of the cement and on the physical and on the mechanical characteristics of concretes [9,10,11,12,13,14]. The use of low calcium fly (in percentage less than 30%)

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