Study of the recycled aggregates nature’s influence on the aggregate–cement paste interface and ITZ

Sidorova, A. S.; Vazquez-Ramonich, Enric; Barra-Bizinotto, Marilda; Rovira, Josep María Puig; Jiménez-Piqué, Emilio

doi:10.1016/j.conbuildmat.2014.06.076

Cited by 89 publications

(32 citation statements)

References 20 publications

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“…The absorption capacity of the recycled aggregate (5%) is in agreement with the 6% absorption capacity observed for recycled concrete aggregate by SIDOROVA et al [9], and is within the limit stipulated by standard NBR 15116 [21] of less than 12% for concrete without structural function. According to PEDRO et al [22], high quality recycled aggregate has the best performance for very small pores (smaller than 0.1 μm) and a water absorption capacity lower than 7%.…”

Section: Properties Of Aggregatessupporting

confidence: 89%

“…Lightweight aggregates improve the quality of the Interfacial Transition Zone (ITZ) because their porosity absorbs water from the paste, reducing the water film around the aggregate [9]. Therefore, recycled aggregate can also improve the ITZ thanks to its absorption capacity and rough surface, which helps the cement paste to better interact with the aggregate, similarly to lightweight aggregates.…”

Section: Introductionmentioning

confidence: 99%

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Effects of pre-wetting aggregate on the properties of mortars made with recycled concrete and lightweight aggregates

2019

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This paper examines the suitability of partially replacing natural aggregate, sand, (NA) with recycled concrete aggregate (RCA) or lightweight aggregate (LWA) in mortars, under the hypothesis that pre-wetting aggregates would produce improvement in mortar properties. Fresh mortar properties such as density, entrained air content, consistency and heat of hydration, as well as hardened mortar properties such as dry density, compressive and flexural strength, and dimensional instability at 0% and 100% saturation were determined. The results show that mortars made with natural aggregate (75%) and recycled concrete aggregate (25%) have similar properties to mortars made with only natural aggregate (100%) and that pre-wetting the aggregates does not influence the properties of mortars significantly. Therefore, partial replacement with recycled concrete aggregate is a viable alternative for producing mortar.

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Section: Properties Of Aggregatessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effects of pre-wetting aggregate on the properties of mortars made with recycled concrete and lightweight aggregates

2019

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“…Limited research published using nanoindentation to study ITZ nano-mechanical properties has mainly analysed the ITZ between recycled concrete aggregate and cement paste [2,[13][14][15]. To the best of our knowledge, no studies have been published in international journals on the micro-mechanical properties of the ITZs between the paste and each constituent (such as asphalt, brick, glass, wood or plastic) found in mixed recycled C&DW aggregate.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…At this time, the recycle rate for construction and demolition waste in the European Union varies widely from country to country, ranging from 10 to 90 % [2]. Many recent studies have focused on assessing the effect of using recycled concrete aggregate [3][4][5] or recycled mixed [6][7][8][9][10] C&DW aggregate on concrete workability, shrinkage, creep, mechanical strength and durability.…”

Section: Introductionmentioning

confidence: 99%

Properties of interfacial transition zones (ITZs) in concrete containing recycled mixed aggregate

Bosque

Zhu

Howind

et al. 2017

Cement and Concrete Composites

210

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Concretes containing mixed recycled aggregate (RA) have a larger number of coarse aggregate/paste interfacial transition zones (ITZs) than conventional concretes, due to the various component materials present in recycled aggregate. This study investigated the properties of various RA/paste ITZs in concrete using nanoindentation and scanning electron microscopy (SEM) and analysed the possible impact of the properties of the ITZs on the macromechanical performance of recycled concrete. It was found that the elastic modulus of the ITZ varies with the type of constituent materials present in recycled aggregate, with ITZs associated with organic components (e.g. wood, plastic and asphalt) exhibiting lower minimum elastic modulus values. The impact of ITZ properties on macro-mechanical properties of concrete depends on the relative content of different constituent materials present in the recycled aggregate and the micro-mechanical properties of the ITZs involved.

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“…Nevertheless, the microstructure of the mortar can be analyzed based on the nanoindentation results. The elastic moduli of the different hydration products, anhydrous cement particles, and aggregates are as follows [39]: Porosity: 0-8 GPa; calcium silicate hydrates and ettringite crystals: 8-30 GPa; calcium hydroxide crystals: 30-50 GPa; unhydrated cement particles, natural aggregates: ≥50 GPa.…”

Section: Mechanical Properties Of Interfacial Transition Zonementioning

confidence: 99%

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

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Study of the recycled aggregates nature’s influence on the aggregate–cement paste interface and ITZ

Cited by 89 publications

References 20 publications

Effects of pre-wetting aggregate on the properties of mortars made with recycled concrete and lightweight aggregates

Effects of pre-wetting aggregate on the properties of mortars made with recycled concrete and lightweight aggregates

Properties of interfacial transition zones (ITZs) in concrete containing recycled mixed aggregate

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

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