Coupling effect of γ-dicalcium silicate and slag on carbonation resistance of low carbon materials

Chen, Z.X.; Chu, Sharon Lynn; Lee, Y.S.; Lee, H.S.

doi:10.1016/j.jclepro.2020.121385

Cited by 50 publications

(11 citation statements)

References 69 publications

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“…Other peaks at 487 °C are related to the decomposition of Ca(OH) 2 [ 55 , 56 ]. The peaks refer to the decarbonation of identified CaCO 3 at a temperature range of 600–800 °C [ 57 , 58 ].…”

Section: Resultsmentioning

confidence: 99%

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

et al. 2021

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Hybrid cement (HC) can be defined as alkali activated-blended-Portland cement (PC). It is prepared by the addition of an alkaline solution to high-volume aluminosilicate-blended-PC. Although this cement exhibits higher mechanical performance compared to conventional blended one (aluminosilicate–PC blend), it represents lower commercial viability because of the corrosive nature of alkaline solution. Therefore, this study focuses on the preparing one-part HC using dry activator–based BFS (DAS). DAS was prepared by mixing sodium hydroxide (NaOH) with BFS at low water to BFS ratio, followed by drying and grinding to yield DAS-powder. Different contents of DAS (equivalent to 70 wt.% BFS and 1, 2, and 3 wt.% NaOH) were blended with 30 wt.% PC. A mixture containing 70 wt.% BFS and 30 wt.% PC was used as a reference sample. The mortar was adjusted at a sand–powder (BFS-PC and/or DAS-PC) weight ratio of 3:1. The microstructural analysis proved that DAS-powder is mainly composed of sodium calcium aluminosilicate–activated species and unreacted BFS. These species can interact again with water to form calcium aluminum silicate hydrate (C-A-S-H) and NaOH, suggesting that the DAS acts as a NaOH-carrier. One-part HC mortars having 1, 2, and 3 wt.% NaOH recorded 7th day compressive strength values of 82%, 44%, and 27%, respectively, higher than that of the control sample. At 180 days of curing, a significant reduction in compressive strength was observed within the HC mortar having 3 wt.% NaOH. This could be attributed to the increase of Ca (within C-S-H) replacement by Na, forming a Na-rich phase with lower binding capacity. The main hydration products within HC are C-S-H, C-A-S-H, and chabazite as part of the zeolite family.

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Section: Resultsmentioning

confidence: 99%

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

et al. 2021

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“…The concrete carbonation is associated with the penetration, by diffusion, of carbon dioxide into the concrete. When it is dissolved in concrete, it induces chemical reactions to dissolve the crystalline phases of concrete, such as calcium hydroxide (CH) giving rise to the production of carbonates, such as calcium carbonate, which leads to a reduction of concrete pH [19,67]. Therefore, the pH of concrete gives information about this durability parameter.…”

Section: Carbonationmentioning

confidence: 99%

Durability and Time-Dependent Properties of Low-Cement Concrete

et al. 2020

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The sustainability concerns of concrete construction are focused both on the materials’ eco-efficiency and on the structures’ durability. The present work focuses on the characterization of low cement concrete (LCC), regarding time-dependent and durability properties. LCC studies which explore the influence of the formulation parameters, such as the W/C (water/cement ratio), W/Ceq, (which represents the mass ratio between water and equivalent cement), W/B (water/binder) ratio, and the reference curves, on the aforementioned properties are limited. Thus, several LCC mixtures were formulated considering two dosages of binder powder, 350 and 250 kg/m3, the former with very plastic consistency and the latter with dry consistency, which were combined with a large spectrum of cement replacement rates (up to 70%), through adding fly ash and limestone filler, and with different compactness levels. The main objectives were to study the influence of the formulation parameters on the properties: shrinkage and creep, accelerated carbonation and water absorption, by capillarity, and by immersion. The lifetime of structures produced with the studied LCC was estimated, considering the durability performance, regarding the carbonation effect on the possible corrosion of the steel reinforcement. LCC mixtures with reduced cement dosage and high compactness, despite the high W/C ratios, have low shrinkage and those with higher strength have reduced creep, however depending on W/Ceq ratio. Those mixtures can be formulated and produced presenting good performance regarding carbonation resistance and, consequently, a long lifetime, which is mandatory for a sustainable construction. LCC with 175 kg/m3 of cement dosage is an example with higher lifetime than current concrete with 250 kg/m3 of cement; depending on the XC exposure classes (corrosion induced by carbonation), the amount of cement can be reduced between 37.5% and 42%, since the LCC with 175 kg/m3 of cement allows reducing the concrete cover below the minimum recommended, ensuring simultaneously the required lifetime for current and special structures.

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“…Some studies had been done to investigate the effect of partially replacing cement with SCMs on durability of concrete. In this regard (Chen et al, 2020) studied coupling effect of γ-dicalcium silicate and slag on Mitikie et al Int J Concr Struct Mater (2022) 16:55 carbonation resistance of low-carbon materials. They studied to maximize the durability and minimize the environmental impact, the possible coupling effect arising from the combined use of γ-C 2 S and slag was systematically investigated.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Basaltic Quarry Dust as a Partial Replacement of Cement for Hollow Concrete Block Production

Mitikie

Alemu

Reda

2022

Int J Concr Struct Mater

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This research was conducted to examine the potential of basaltic crusher dust as a partial replacement for Portland Pozzolana cement in hollow concrete block (HCB) production. Quarry dust is one of the waste materials abundantly available and pozzolanic material in the quarry industry. In doing so, physical tests of cement pastes and hollow concrete blocks of different classes, i.e., A, B, and C, were produced by partially replacing the cement content with 10%, 20%, 30%, and 40% by weight of basaltic crusher dust using vibrating block molding machine. The units without basaltic crusher dust (0%) serve as a control variable. The cement pastes were examined for consistency and setting time, and the blocks produced were tested to determine their compressive strength, water absorption rate, and density. Furthermore, the possible cost advantages of using basaltic crusher dust as a partial replacement of cement in the hollow concrete block were analyzed. The result indicates that the experimental HCB of classes A and C surpassed the required standard of compressive strength, water absorption, and density specified by the Ethiopian standard ES 596:2001; whereas, the compressive strength of class B fails at 40% cement replacement. It was concluded that hollow concrete blocks of classes A and C with up to 40% replacement and class B with up to 30% replacement can be used for load-bearing walls and save the e cost of hollow concrete blocks with comparable properties.

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Coupling effect of γ-dicalcium silicate and slag on carbonation resistance of low carbon materials

Cited by 50 publications

References 69 publications

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

Durability and Time-Dependent Properties of Low-Cement Concrete

Utilization of Basaltic Quarry Dust as a Partial Replacement of Cement for Hollow Concrete Block Production

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