End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

Nicoara, Adrian Ionut; Stoica, Anca‐Iulia; Vrabec, Mirijam; Rogan, Nastja; Šturm, Sašo; Ow‐Yang, Cleva W.; Gülgün, Mehmet Ali; Bundur, Zeynep Basaran; Ciucă, Ion; Vasile, Bogdan Ștefan

doi:10.3390/ma13081954

Cited by 57 publications

(41 citation statements)

References 116 publications

(180 reference statements)

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“…properties of modified cement matrix composites reinforced with fibers [14,[18][19][20]; • application of new types of supplementary cementitious materials [13,16,[21][22][23][24][25][26][27][28]; • characterization of various types of modified cement based materials [18,21,23,[25][26][27][28][29][30][31].…”

Section: Short Description Of the Articles Presented In This Special Issuementioning

confidence: 99%

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Fantilli

Jóźwiak–Niedźwiedzka

2021

Materials

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Section: Short Description Of the Articles Presented In This Special Issuementioning

confidence: 99%

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Fantilli

Jóźwiak–Niedźwiedzka

2021

Materials

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“…The voids cause low density and high water absorption [1]. It has been reported that various factors such as the amount and moisture of recycled coarse aggregates (RCA), water to cement ratio, source concrete strength, number of crushing steps, age of primary concrete, and the amount of adhesive mortar have an important effect on regulating the properties of these aggregates [12][13][14][15]. Furthermore, the use of small amounts of recycled fine aggregates, between 6% to 10%, was recommended [16].…”

Section: Introductionmentioning

confidence: 99%

Studying the C–H Crystals and Mechanical Properties of Sustainable Concrete Containing Recycled Coarse Aggregate with Used Nano-Silica

et al. 2021

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The present study aims to replace 30%, 40%, and 50% of the natural coarse aggregate (NCA) of concrete with recycled coarse aggregate containing used nano-silica (RCA-UNS) to produce a new sustainable concrete. Three groups of concrete are made and their mechanical properties and microstructure are studied. In the first group, which was the control group, normal concrete was used. In the second group, 30%, 40%, and 50% of the NCA were replaced with coarse aggregate obtained from crushed concrete of the control samples and with 0.5% nano-silica as filler. In the third group, 30%, 40%, and 50% of the concrete samples’ NCA were replaced with aggregates obtained from 90-day crushed samples of the second group. Water absorption, fresh concrete slump, and compressive strength of the three groups were investigated and compared through scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) tests. The results show that the third group’s compressive strengths increased by 12.8%, 10.9%, and 10% with replacing 30%, 40%, and 50% of NAC with RCA-NS at 28 days compared to the control samples, respectively. This could be due to the secondary production of calcium silicate hydrate due to the presence of new cement paste. The third group’s microstructure was also improved due to the change in the C–H and the production of extra C–S–H. Therefore, the hydration of cement with water produces C–H crystals while reactions are induced by recycled aggregate containing used nano-silica.

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“…The cement production process generates almost 7% of the global greenhouse gas emissions [ 6 , 7 , 8 , 9 , 10 ]. Using waste as supplementary cementitious materials (SCMs) instead of clinker in the technology of cement production and cement in concrete will contribute to the partial solution of the above-mentioned problems [ 11 , 12 , 13 ]. Ground granulated blast-furnace slag and fly ash are among the types of waste that are utilized successfully in the construction industry and are attributed to the supplementary cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Properties of Concretes Incorporating Recycling Waste and Corrosion Susceptibility of Reinforcing Steel Bars

et al. 2021

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In this paper, properties of concretes incorporating recycling waste and corrosion susceptibility of reinforcing steel bars were studied. It was established that fineness of ground granulated blast furnace slag (GGBFS) and fly ash (FA) and their simultaneous combination have an influence on the kinetics of strength development of Portland cements and concretes. The compressive strength of concrete containing 10% by mass of GGBFS and 10% by mass of FA even exceeds the compressive strength of control concrete by 6.5% and concrete containing 20% by mass of GGBFS by 8.8% after 56 days of hardening. The formation of the extra amount of ettringite, calcium hydrosilicates as well as hydroaluminosilicates causes tightening of a cement matrix of concrete, reducing its water absorption, and improving its resistance to freezing and thawing damage.

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End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

Cited by 57 publications

References 116 publications

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Studying the C–H Crystals and Mechanical Properties of Sustainable Concrete Containing Recycled Coarse Aggregate with Used Nano-Silica

Properties of Concretes Incorporating Recycling Waste and Corrosion Susceptibility of Reinforcing Steel Bars

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