Reactive transport numerical modeling of mortar carbonation: Atmospheric and accelerated carbonation

Jeong, Jena; Ramézani, Hamidréza; Chuta, Edgar

doi:10.1016/j.jobe.2019.01.038

Cited by 19 publications

(4 citation statements)

References 56 publications

(89 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The carbonation of the mortars take place due the substitution of the hydroxyls groups of Mg(OH)2 and Ca(OH)2 by MgCO3 and CaCO3 (Li, Farzadnia, Shi, 2017). This chemical reaction modifies the crystalline structure and, hence, the mechanical properties of the specimens (Jeong, Ramézani, Chuta, 2019). In the compression test, shown in Figure 5., it is observed that samples containing 50/50 sand/CDW had an increase in compressive strength.…”

Section: Resultsmentioning

confidence: 99%

Carbonation and CO2 uptake in rendering mortars produced with recycled construction and demolition waste

Mazurana¹,

Possan²,

Bittencourt³

2019

Memorias Conpat 2019

View full text Add to dashboard Cite

This paper aims to evaluate the CO2 uptake due to rendering mortar carbonation, produced with different rates of construction and demolition waste (CDW). Three different mortars were produced with the replacement of 0, 50 and 100% natural sand by CDW recycled sand. The CO2 uptake was conducted by thermal analysis for samples exposed to CO2 action in a laboratory environment for 96 days. Results showed that the incorporation of CDW recycled aggregate contributes to the CO2 uptake. Mortars with 100% recycled sand can capture up to 57% more CO2 than those without waste. This process can present an important contribution by reducing the construction environmental impacts since cement products are constantly absorbing CO2 during the construction phase, building service life and in the post-demolition period.

show abstract

Section: Resultsmentioning

confidence: 99%

Carbonation and CO2 uptake in rendering mortars produced with recycled construction and demolition waste

Mazurana¹,

Possan²,

Bittencourt³

2019

Memorias Conpat 2019

View full text Add to dashboard Cite

show abstract

“…According to the law of conservation of mass and Fick's second law, the transfer of calcium ions in concrete can be described by Eqs. ( 13)-( 15): (13) (14) (15) where is the molar concentration of calcium ions in concrete; is the effective diffusion coe cient of calcium ions in concrete; is the molar concentration of solid-phase calcium. The solid phase calcium content and the calcium ion concentration in the liquid phase can be calculated according to the solid-liquid equilibrium curve.…”

Section: Diffusion-reaction Synergism Modelmentioning

confidence: 99%

“…This will lead to a deterioration in the internal transportation performance of concrete, greatly compromising the overall mechanical properties of concrete [11,12] . Some numerical models combine carbonization and calcium dissolution by introducing chemical equilibrium relationships [13,14] . The results of these studies indicate that calcium leaching has a major in uence on concrete carbonation.…”

Section: Introductionmentioning

confidence: 99%

A diffusion-reaction synergism model for concrete carbonation: Combined effects of calcium leaching and temperature

Mo,

Wang,

2024

Preprint

View full text Add to dashboard Cite

The deterioration behavior caused by carbonization can reduce the durability of concrete structures. This study established a diffusion-reaction synergism model of concrete carbonation depth considering calcium leaching and temperature field, and predicted the influence of calcium leaching process and temperature on the carbonation resistance of concrete. Specifically, calcium leaching is described using solid-liquid equilibrium curves. The model was validated using published experimental data. The effects of calcium leaching, temperature, and concrete water saturation on carbonation are analyzed. The results show that the calcium leaching effect has a strong influence on the carbonation of concrete, so future models need to include it.

show abstract

“…The cement paste rheology depends on the grain size and shape, water content, temperature, and hydration [41]. Generally, the rheological properties are highly influenced in a composite fresh mix and the major factors are size and shape of SCMs used, volume contribution, and w/b ratio.…”

Section: Rheology Modelsmentioning

confidence: 99%

Fresh state and hydration properties of high-volume lithium slag cement composites

et al. 2023

View full text Add to dashboard Cite

In this study, the fresh state and hydration properties of 0–60% lithium slag blended cement pastes were investigated at water-binder ratio of 0.47. The workability of the fresh pastes was evaluated by measuring the air content, marsh cone flow, mini-slump flow, setting times, and through rheology tests. A 40% lithium slag cement could produce 91% strength activity index at 28 days; mini-slump pat diameter of 70.54 mm; marsh cone flow efflux time of 145 s; air content 0.6%; hydration heat of 300 J/g (at 72 h). At replacement levels above 40%, the strength activity index, air content, mini-slump flow, hydration heat, and fluidity were significantly reduced. Experimental investigations confirm that the mini-slump test provides the best correlation coefficients (R2 = 0.96) with the maximum shear viscosity of lithium slag cement pastes than the marsh cone flow efflux time and air content. The classical slump and rheological models were used to characterise the mini-slump, yield stress, and plastic viscosity of low to high volume lithium slag cement pastes. The present study recommends that a 40% lithium slag cement paste is a viable option to produce green concrete for optimum fresh, hydration, rheological, and hardened properties.

show abstract

Reactive transport numerical modeling of mortar carbonation: Atmospheric and accelerated carbonation

Cited by 19 publications

References 56 publications

Carbonation and CO2 uptake in rendering mortars produced with recycled construction and demolition waste

Carbonation and CO2 uptake in rendering mortars produced with recycled construction and demolition waste

A diffusion-reaction synergism model for concrete carbonation: Combined effects of calcium leaching and temperature

Fresh state and hydration properties of high-volume lithium slag cement composites

Contact Info

Product

Resources

About