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10 25 to 30 25 of recycled fines
Influences of Carbonated Recycled Concrete Fines on
In this work, carbonation treatment is applied to improve the properties of recycled concrete fine, and the influences of carbonated recycled concrete fine (CRCF) Demolished or waste concretes can be crushed into particles with appropriate sizes to be used as coarse or fine aggregates in new concretes. This Eco-friendly treatment of recycled concrete fines as
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Reuse of recycled crushed concrete fines as mineral addition
Portland cement could be substituted by RCCF (Recycled Crushed Concrete Fines) up to 25 % without altering properties of mortars. These results are carbonated recycled fines can facilitate the nucleation and stabilization of hydration gels and RH and 25 ± 2 °C for at least 24 h to ensure the moisture content Roles of carbonated recycled fines and aggregates in
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Beneficiation of recycled concrete fines through accelerated
1 Introduction Construction and demolition wastes (C&DW) account for the largest portion of the anthropogenic residues in the European Union (25–30%) [ 1, 2 ], The article presents the results of research on geopolymer composites produced from two types of waste materials—hemp and fine fractions recovered from Alkali-Activated Mortars with Recycled Fines and Hemp as a
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Utilization of recycled concrete fines and powders to
PY 2020/9/10. Y1 2020/9/10. N2 This paper investigated the properties of alkali-activated slag (AAS) concrete blocks incorporated with recycled concrete fines (RCFs) The preparation of recycled concrete aggregate generates a lot of fines, which are obstacles for implementing the recycled concrete aggregate. In this work, carbonation treatment is applied to improve the properties of recycled concrete fine, and the influences of carbonated recycled concrete fine (CRCF) on cement hydration process are Influences of Carbonated Recycled Concrete Fines on
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Fast enhancement of recycled fine aggregates properties by
Above 30% cement replacement, the RCP beneficiated through CO 2 injection reduced the concrete's eCO 2 per unit strength by 10–25%, while the thermally treated RCP had greater eCO 2 than conventional SCMs. Thus, circularising end-of-life concrete does not guarantee low carbon concrete production. The carbonation kinetics The Cc morphologies at 10 min was found to be relatively consistent regardless of the temperature differences. The Cc precipitated on the RCFs surfaces at 0.5 M-25 °C/45 °C/60 °C all showed a cubic shape with the general size between 2 μm and 5 μm, while the size slightly reduced with the increasing temperature.Enhancing the treatment efficiency of recycled concrete fines
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(PDF) Influences of Carbonated Recycled Concrete Fines
Specifically, the total hydration heat after 48 h of cement paste with 30% CRCF is less than 50% of that with 0% CRCF. Besides that, CRCF consumes CH in cement paste and improves the poreSodium carbonate (Na2CO3), an environmentally friendly activator, has been shown to have vast potential for the development of sustainable alkali-activated slag mortars. However, Na2CO3-activated slag mortars exhibit a delayed reaction process and limited early-age strength development, restricting their wider application. In this work, Materials Free Full-Text Accelerating the Reaction Kinetics
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Mitigating inclusion-induced shrinkage cracking in
Above 30% cement replacement, the RCP beneficiated through CO 2 injection reduced the concrete's eCO 2 per unit strength by 10–25%, while the thermally treated RCP had greater eCO 2 than conventional SCMs. Thus, circularising end-of-life concrete does not guarantee low carbon concrete production.The C&D waste contains near about 25–30% of concrete which can be used in the concrete production in the form of recycled aggregates [12]. The recycled aggregates are generally used in the form of coarse aggregates and fine aggregates based on their sizes. (A-UHPC) prepared by using recycled concrete fines (RCF) to replace Utilization of recycled fine powder as an activator in fly ash
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Fines extracted from recycled concrete as alternative raw
No major influence on the mineralogy of the final clinker was demonstrated by using recycled fines as alternative raw material. Above 30% cement replacement, the RCP beneficiated through CO 2 injection reduced the concrete's eCO 2 per unit strength by 10–25%, while the thermally treated RCP had greater eCO 2 than conventional SCMs. In addition, the increase of carbonation temperature from 25 ± 5 °C to 70 ± 5 °C considerably enhanced the CO2 uptake of recycled aggregates by 38.6% within 24 h, in comparison with that ofHigh-temperature CO2 for accelerating the carbonation of recycled
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Roles of carbonated recycled fines and aggregates in
The carbonation kinetics of recycled fines in aqueous environment exhibit a typical particle size effect, while the high pozzolanic reactivity of carbonated recycled fines can facilitate the nucleation and stabilization of hydration gels and contribute to the rapid hydration of cement paste. -25.88/-25.21/-24.67 [99] 10-20/20–30/30-40The recycled aggregate based concrete (BR1, BR2) and combined aggregate based concrete (BC1), gave respective average compressive strength of 21.55 MPa, 20.50 MPa and 20.30 MPa, i.e. a differenceEco-friendly treatment of recycled concrete fines as
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Roles of recycled fine aggregate and carbonated recycled
The use of recycled aggregate or carbonated recycled aggregate in new concrete is considered a good way to solve the problem of construction and demolition waste. This study aims to investigate the influences of recycled fine aggregate (RFA) and carbonated RFA (CRFA) on the properties of alkali-activated slag and glass powder 14The results showed that the flow loss of mortar during the first 30 mins increased with the 15incorporation of recycled fines due to the high water-absorption of RFA and the low hydration 16reactivity of RP. The drying shrinkage development of 3DPM was higher than that of cast mortar 17during the first 28 days, but exhibited a deceleration inManuscript Submitted to Construction and Building
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Beneficiation of recycled concrete fines through accelerated
Construction and demolition wastes (C&DW) account for the largest portion of the anthropogenic residues in the European Union (25–30%) [1, 2], and demolished concrete continues to be the major C&DW in this region (60–70% of total C&DW []) and across the world [].Concrete recycling is a common practice when demolishing concrete In this study, cement graded PO42.5 was used as binder for all mixtures. Recycled powder was used as supplemental cementitious materials in FRAC. Cement met the requirements of GB 175–2007 [46]. Recycled powder was ground from recycled fines with a particle size of less than 4.75 mm, and then was sieved to a particle size of 0.15 Long-term shrinkage and mechanical properties of fully recycled
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Mechanism of carbonating recycled concrete fines in
Mechanism of carbonating recycled concrete fines in aqueous environment: The particle size effect decrease of water absorption and crushing value by 1.3–29.0% and 7.6–25.9% respectively, as well as an increase in paste samples were prepared by using RCF015 as the cement replacement at 10%, 30% and 50% and the The latter pattern was observed irrespective of the coarse fraction replacement ratio when the mixes also bore recycled mixed fines (HR-25 + 50 M and HR-50 + 50 M). Bravo et al. [30] observed the same behaviour and greater macroporosity in concretes bearing recycled fines with a lower percentage of Rc + Ru.Use of recycled coarse and fine aggregates in ScienceDirect
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Mechanism of carbonating recycled concrete fines in
Mechanism of carbonating recycled concrete fines in aqueous environment: The particle size effect decrease of water absorption and crushing value by 1.3–29.0% and 7.6–25.9% respectively, as well as an increase in the density by 0.2–5.6% could be obtained [11,13,15,16]. it drastically increased to 46.9% for RCF015 after In this study, the effects of different contents of Nano-SiO2 (NS) on a slump, compressive strength, splitting tensile strength, flexural strength, hydration products, and microstructure of recycled fine aggregate concrete (RFAC) were investigated. The results show that the addition of recycled fine aggregate (RFA) has a significant negative Study on mechanical properties and microstructure of recycled
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Study on Recycled Concrete Powders as Mineral Admixture in Recycled
The type of ECO-RPC with the substitution of 25% ultra-fine slag, 25% ultra-fine fly ash and 10% silica fume is better than the others with compressive strength, flexural strength, and fracture
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