In situ materials characterization of full-scale recycled aggregates concrete structures

Soares, D.; Brito, Jorge de; Ferreira, J.G.; Pacheco, João

doi:10.1016/j.conbuildmat.2014.08.025

Cited by 48 publications

(15 citation statements)

References 29 publications

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“…Post-glacial sand obtained following the process of hydroclassification from the region of West Pomerania was used to make the sample elements. Applying such sand is consistent with the global tendency connected with environmental sustainability (Meyer 2009;Hendriks, Janssen 2003;Soares et al 2014;Ulsen et al 2013). A similar situation, with excessive sand fractions, may be observed in other areas of the world, e.g.…”

Section: Materials and Sample Elementssupporting

confidence: 86%

Estimating the Properties of a Fine Aggregate Fibre Reinforced Cementitious Composite Using Non-Destructive Methods

Głodkowska

Kobaka

2018

Journal of Civil Engineering and Management

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The paper proposes a method of estimating the properties of a fine aggregate steel fibre reinforced cementitious composite using non-destructive methods. Two methods were selected to identify the properties of such a composite. One of them uses electromagnetic induction in order to estimate the content of steel fibres dispersed in the composite space, while the other is based on the determination of ultrasonic wave velocity propagating through the composite. Having defined correlations between the properties of the fibre reinforced composite and non-destructive testing parameters, regression equations were determined. Seven relationships between properties of fibre reinforced composite as the dependent variables and two independent variables, i.e.: amperage and ultrasonic wave velocity, were established. Knowing the amperage and the ultrasonic wave velocity, the basic properties of the fibre reinforced composite can be determined from the regression equations in a non-destructive manner. In order to verify the equations, three plates with different amounts of steel fibres were made in field under natural conditions, and next subjected to non-destructive tests. The tests showed good compatibility between the experimental results and those of calculations, which indicates the correctness of the formulated equations.

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Section: Materials and Sample Elementssupporting

confidence: 86%

Estimating the Properties of a Fine Aggregate Fibre Reinforced Cementitious Composite Using Non-Destructive Methods

Głodkowska

Kobaka

2018

Journal of Civil Engineering and Management

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“…Concrete’s physical characteristics and the presence of anhydrous cement particles in RA are two opposing mechanisms that, according to Katz [ 15 ], can affect the properties of RAC, together with the characteristics of the new cement matrix. The properties of RA have an impact on the properties of RAC that are fairly discussed in the literature [ 3 , 15 , 16 , 17 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ], leading to some summary conclusions: The porosity of coarse RA negatively influences the compressive strength and modulus of elasticity, tensile strength, abrasion resistance, shrinkage, water absorption, carbonation resistance, and chloride ion penetration. The effect of RA depends on the property under analysis and on the mechanical strength of the RAC to be produced; There are no marked differences between RAC and NAC, if the quality of RA is good, especially in the properties that are more dependent on the new ITZ, such as compressive strength, splitting tensile strength and abrasion; The microstructure characteristics of the ITZ of coarse RA are different from those of the ITZ of coarse NA and are influenced by the original concrete (OC)’s properties; RAC fracture can occur through RA and not necessarily through the new ITZ.…”

Section: Properties Of Concrete With Recycled Aggregatesmentioning

confidence: 99%

A Review on Alkali-Silica Reaction Evolution in Recycled Aggregate Concrete

2020

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Alkali-silica reaction (ASR) is one of the major degradation causes of concrete. This highly deleterious reaction has aroused the attention of researchers, in order to develop methodologies for its prevention and mitigation, but despite the efforts made, there is still no efficient cure to control its expansive consequences. The incorporation of recycled aggregates in concrete raises several ASR issues, mainly due to the difficult control of the source concrete reactivity level and the lack of knowledge on ASR’s evolution in new recycled aggregate concrete. This paper reviews several research works on ASR in concrete with recycled aggregates, and the main findings are presented in order to contribute to the knowledge and discussion of ASR in recycled aggregate concrete. It has been observed that age, exposure conditions, crushing and the heterogeneity source can influence the alkalis and reactive silica contents in the recycled aggregates. The use of low contents of highly reactive recycled aggregates as a replacement for natural aggregates can be done without an increase in expansion of concrete. ASR expansion tests and ASR mitigation measures need to be further researched to incorporate a higher content of recycled aggregates.

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“…So, semi-destructive and non-destructive testing methods have been proposed to realistically estimate the in-situ strength of concrete [15][16][17]. Of all non-destructive testing methods, the Schmidt rebound hammer test was first developed by a Swiss engineer in the late 1940s [18].…”

Section: Introductionmentioning

confidence: 99%

Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing

Kazemi

Madandoust

Brito

2019

Construction and Building Materials

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The main objective of this study was to estimate the compressive strength of recycled aggregate concrete (RAC) by means of Schmidt rebound hammer and core testing. The use of recycled aggregate in concrete has been shown to lead to a decrease in the construction cost and it can reduce the burden on the environment by saving natural aggregates. On the other hand, some nondestructive and semi-destructive techniques, such as Schmidt rebound hammer and core testing, are long-established methods for strength estimation of materials. Thus, the present study intended to obtain the compressive strength of RAC using these methods and then compare it with the results of 150 mm cube specimens. To achieve this goal, after producing concrete mixes with 70% replacement of recycled coarse aggregate, 96 cube specimens and 8 concrete slabs were cast to perform Schmidt rebound hammer, core and cube testing. In addition, the combination of the methods was used to obtain correlations between Schmidt rebound hammer and core testing. The results demonstrate that a multi-variable equation using these tests' results can efficiently predict the compressive strength of RAC and conventional concrete and is more promising than single-variable equations based on the Schmidt rebound hammer test results.

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In situ materials characterization of full-scale recycled aggregates concrete structures

Cited by 48 publications

References 29 publications

Estimating the Properties of a Fine Aggregate Fibre Reinforced Cementitious Composite Using Non-Destructive Methods

Estimating the Properties of a Fine Aggregate Fibre Reinforced Cementitious Composite Using Non-Destructive Methods

A Review on Alkali-Silica Reaction Evolution in Recycled Aggregate Concrete

Compressive strength assessment of recycled aggregate concrete using Schmidt rebound hammer and core testing

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