On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

Rodríguez, Carlos; Sánchez, Isidro; Miñano, Isabel; Benito, Francisco J.; Cabeza, M.; Parra, C.

doi:10.3390/su11030633

Cited by 7 publications

(8 citation statements)

References 48 publications

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“…This hypothesis becomes more evident when the substitution rate increases to 15%. The efficiency of natural and recycled diatomites as additions is confirmed by these results, and are in agreement with the behaviour of active additions regarding the capillary suction of concrete [8].…”

Section: Capillary Water Absorptionsupporting

confidence: 86%

“…Blended cements correspond to cements with a partial substitution of clinker for inert mineral additions (limestones) or chemically active additions, such as pozzolanas (silica smoke, metakaolin, fly ash, rice shell ash) or blast furnace steel slag [5]. These cements may or may not present, depending on the type, a quality and quantity of additional technical advantages such as a lower water demand, reduced hydration heat, reduced porosity, and good behavior against aggressive media [6][7][8]. However, the strategy of replacing clinker with supplementary cementitious materials is currently at risk, we could potentially run out of the most widely used sources of supplementary cementitious materials, such as fly ash and ground granulated blast furnace slag.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

et al. 2021

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The concrete industry is under increasing pressure to reduce greenhouse gas emissions. An immediate solution is to minimize the amount of Portland cement used by partially substituting other supplementary cementitious materials. This article presents the results of an experimental campaign on the influence of replacing Portland cement with both calcined and uncalcined diatomites from the filtration of beer and wine in the production of elements made of vibro-pressed pre-cast concrete, such as pipes. Additionally, a natural diatomite is used. The mechanical properties, capillary water absorption, carbonation, and chloride ingress are tested. The results obtained show the possibility of using natural and recycled diatomites on an industrial scale, which can improve even the long term properties of prepared precast concrete.

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Section: Capillary Water Absorptionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

et al. 2021

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“…us, the recycled concrete can be used in the construction industry to some extent [15]. Rodriguez et al [16] applied recycled concrete to nonstructural concrete elements and tested their mechanical properties, carbonization resistance, and chloride ingress through experiments.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Thermal Properties of RCB Masonry Containing Three Rows of Holes

Yuan

Zhu

Wang

et al. 2021

Advances in Materials Science and Engineering

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In order to promote and apply the structures of the recycled concrete block (RCB) masonry, the thermal and mechanical properties of the recycled concrete specimens were tested in this study. The RCB can meet load-bearing and seismic requirements and was prepared through experiments. Concurrently, the mechanical property experiment was conducted on the RCB masonry, and then its failure process and mode were discussed. In addition, a thermal property test was completed on the RCB wall, and the difference in the thermal properties of single-row hole, three-row hole, and solid blocks was analyzed by theoretical calculations. The results indicated that the mechanical properties of the RCB masonry were basically the same as those of the natural concrete block masonry, and they have good compressive stability. The calculation formulas of the compressive and shear strengths of the natural concrete block masonry are applicable to the RCB masonry. The RCB masonry containing three rows of holes owns more outstanding thermal property than natural concrete block masonry and satisfies the requirements for related codes.

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“…Estimations on the use of concrete, quantify it to be as much as 30 million tonnes per year, being considered as the largest production of manufactured products [1]. Substituting natural aggregates by recycled materials or residues allows reducing CO 2eq (carbon dioxide equivalent) emissions (carbon footprint) in the fabrication of concretes [2,3]. This use of recycled materials or residues as aggregate in concretes allows reducing such residues accumulating in dumps [4].…”

Section: Introductionmentioning

confidence: 99%

Improvements in Aggregate-Paste Interface by the Hydration of Steelmaking Waste in Concretes and Mortars

et al. 2019

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The objective of the experimental work is to study the mechanical properties in self-compacting concretes (SCC) in which part of the limestone aggregate has been replaced by granulated blast furnace slag (GBFS) in different percentages ranging from 0% to 60%. The results show that at early ages the SCC with the largest content in slag tend to have lower compressive strengths due to the poor compacting of the aggregates, although in the long-term their strength increases due to the reactivity of the slag. In fact, at the age of 365 days, the mortars made with the substitution of 50% of cement by ground GBFS reach compressive strength similar to that of the mortar made with 100% of cement. The consumption of calcium hydroxide during the hydration of the GBFS and the formation of hydrated calcium silicate (CSH) improve the mechanical properties of the slag-paste interface. The new compounds formed by the hydration of anhydrous oxides of the GBFS improve the aggregate-paste transition zone. The chemical interaction between the dissolution of the cement pore and the GBFS ends up generating new compounds on its surface. The increasing hydration of the GBFS produces a greater amount of silica gel that polymerises, densifying the matrix and reducing the porosity, which improves the mechanical properties of the concrete and perhaps its durability. The topography of the particles and their interface are analysed with atomic force microscopy techniques to assess the morphology depending on the aggregate used. On the other hand, a study was carried out of the aggregate-paste interface with scanning electronic microscope at different ages. It can be seen that in the contours of the hydrated GBFS particles, a band or ring forms with the new reaction products. The results obtained strengthen the previous conclusions. The new hydrated compounds fill the reaction ring, introducing chemical bonds between the aggregate and the interface, occupying part of the original pores or substituting spaces occupied originally by large portlandite crystals, of lesser mechanical strength and easily leached. For all this, the benefit is twofold. On the one hand, use is made of industrial by-products and, on the other hand, part of the destruction of natural quarries to obtain the necessary raw materials is avoided.

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On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

Cited by 7 publications

References 48 publications

Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

Mechanical and Thermal Properties of RCB Masonry Containing Three Rows of Holes

Improvements in Aggregate-Paste Interface by the Hydration of Steelmaking Waste in Concretes and Mortars

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