Mechanical properties of structural concrete with fine recycled ceramic aggregates

This paper reports an evaluation of the properties of medium-quality concrete incorporating recycled coarse aggregate (RCA). Concrete specimens were prepared with various percentages of the RCA (25%, 50%, 75%, and 100%). The workability, mechanical properties, and durability in terms of abrasion of cured concrete were examined at different ages. The results reveal insignificant differences between the recycled concrete (RC) and reference concrete in terms of the mechanical and durability-related measurements. Meanwhile, the workability of the RC reduced vastly since the replacement of the RCA reached 75% and 100%. The ultrasound pulse velocity (UPV) results greatly depend on the porosity of concrete and the RC exhibited higher porosity than that of the reference concrete, particularly at the transition zone between the RCA and the new paste. Therefore, the sound transmission in the RC required longer times than that in the reference concrete. Moreover, a predictive equation relating the compressive strength to the UPV was developed.

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Influence of microstructure on fluid transport and mechanical properties in structural concrete produced with lightweight clay aggregates

Construction and Building Materials ◽

10.1016/j.conbuildmat.2018.03.135 ◽

2018 ◽

Vol 171 ◽

pp. 388-396 ◽

Cited By ~ 4

Author(s):

C. Pla ◽

A.J. Tenza-Abril ◽

J. Valdes-Abellan ◽

D. Benavente

Keyword(s):

Mechanical Properties ◽

Fluid Transport ◽

Structural Concrete ◽

Clay Aggregates

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RECYCLING AND ITS USE IN CONCRETE WASTE PROCESSING BY HIGH-SPEED MILLING

Acta Polytechnica CTU Proceedings ◽

10.14311/app.2019.21.0028 ◽

2019 ◽

Vol 21 ◽

pp. 28-32

Author(s):

Zdeněk Prošek ◽

Pavel Tesárek ◽

Jan Trejbal

Keyword(s):

Mechanical Properties ◽

Particle Size ◽

Dynamic Modulus ◽

High Speed ◽

Milling Process ◽

Partial Replacement ◽

Waste Processing ◽

Structural Concrete ◽

High Speed Milling ◽

Milling Method

This article discusses the possibility of recycling of concrete waste using the high-speed milling method. The resulting of milling is micronize old concrete. Used old concrete was created by crushing of old concrete, which served as a structural concrete for the construction of a supporting column. Two level of milling process was used to recycle old concrete. The main use of waste is the possibility of partial replacement of commonly used binder and microfillers in concrete. For this reason, properties as particle size distribution, dynamic modulus of elasticity, flexural strength and compressive strength were observed. The aim is to replace as much cement as possible while maintaining mechanical properties.

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Analysis of the mechanical properties of the concrete with partial substitution of the kind’s aggregate glass powder

International Journal for Innovation Education and Research ◽

10.31686/ijier.vol9.iss6.3204 ◽

2021 ◽

Vol 9 (6) ◽

pp. 406-425

Author(s):

Paulo Ricardo Alves dos Reis Santos ◽

Diovana da Silva Santos ◽

Max Silva de Almada ◽

Lirana Lamara Barreto da Silva ◽

Italo Gutierry Carneiro da Conceição ◽

...

Keyword(s):

Mechanical Properties ◽

Large Scale ◽

Glass Powder ◽

Experimental Methodology ◽

Partial Substitution ◽

Fine Aggregate ◽

Structural Concrete ◽

Natural Sand ◽

Hardened State ◽

Object Of Study

In this study, the influence of partial introduction as glass as fine aggregate on the composition of simple concrete is analyzed, considering that sand (fine aggregate currently used) has been used on a large scale in civil construction over the years and has been affecting the environment. The main objective of this research was to analyze the mechanical properties of concrete, partially replacing the natural sand with another fine aggregate made from glass residues, evaluating the behavior presented at the end of each test using different percentages of this material as fine aggregate in the concrete composition. From an experimental methodology that consisted of determining an object of study (concrete), selecting the variable that would possibly be able to influence it (glass powder) and defining the ways of controlling and observing the effects that the variable would produce on the object, an interpretation of how the mechanical properties of the glass powder that affect the performance of structural concrete is presented. The granulometry was subsequently analyzed, the tests carried out both in the fresh and hardened state of the concrete, and identified that the glass in a certain percentage proves to be viable. Finally, it can be concluded that the partial inclusion of glass affects the mechanical properties of structural concrete, and can present quite satisfactory results, both related to the environment, since the sand would not be used entirely as fine aggregate or in reaching a resistance suitable for its final use.

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