Influence of the initial moisture content on the carbonation degree and performance of fiber-cement composites

Tonoli, Gustavo Henrique Denzin; Carmello, Guilherme Fernando; Fioroni, C.A.; Pereira, Tiago de Lima; Rocha, Gustavo Miranda; Souza, Rui Barbosa de; John, Vanderley M.; Savastano, Holmer

doi:10.1016/j.conbuildmat.2019.04.159

Cited by 26 publications

(15 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…More specifically, the mesopore decreases from 1.42% to 1.28% after 28 d of accelerated carbonation. in the range of 0.1 to 10 μm, and the sustained load had a limited influence on generating pores (flaw) larger than 10 μm due to the bridging effect of the fibres [63]. The redistributed pore size distribution enhanced the resistance of microstructure to CO2 penetration.…”

Section: Porosity and Pore Size Distributionmentioning

confidence: 99%

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

Zhang

Shao

Zhang³

et al. 2022

Materials

View full text Add to dashboard Cite

Engineered cementitious composites (ECCs) belong to a broad class of fibre-reinforced concrete. They incorporate synthetic polyvinyl alcohol (PVA) fibres, cement, fly ash and fine aggregates, and are designed to have a tensile strain capacity typically beyond 3%. This paper presents an investigation on the carbonation behaviour of engineered cementitious composites (ECCs) under coupled sustained flexural load and accelerated carbonation. The carbonation depth under a sustained stress level of 0, 0.075, 0.15, 0.3 and 0.6 relative to flexural strength was measured after 7, 14 and 28 days of accelerated carbonation. Thermogravimetric analysis, mercury intrusion porosimetry and microhardness measurements were carried out to show the coupled influence of sustained flexural load and accelerated carbonation on the changes of the mineral phases, porosity, pore size distribution and microhardness along the carbonation profile. A modified carbonation depth model that can be used to consider the coupled effect of flexural tensile stress and carbonation time was proposed. The results show that an exponential relationship can be observed between stress influence coefficient and flexural tensile stress level in the carbonation depth model of ECC, which is different when using plain concrete. Areas with a higher carbonation degree have greater microhardness, even under a large sustained load level, as the carbonation process refines the pore structure and the fibre bridges the crack effectively.

show abstract

Section: Porosity and Pore Size Distributionmentioning

confidence: 99%

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

Zhang

Shao

Zhang³

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…The formation of CaCO3 after curing by means of carbonation has improved the pore structure and has shown higher efficiency for pore filling. That is why carbonation curing provides a good way how to efficiently recycle industrial wastes as mineral additives [5][6][7]. The samples exposed to the effect of CO2 show a denser microstructure compared to the samples not exposed to CO2.…”

Section: Introductionmentioning

confidence: 99%

The effect of CO₂ on cement composites produced with an admixture of waste sludge water from a concrete plant

Klus¹,

Svoboda²,

Václavík³

et al. 2019

Selected Scientific Papers - Journal of Civil Engineering

View full text Add to dashboard Cite

This article presents the results of a research dealing with the effect of CO2 on cement composites prepared on the basis of waste sludge water from the concrete plant. The designed formulas R1 and R3 use waste sludge water from the concrete plant as a partial or complete replacement of mixing water in the production of cement composites. The mixing water was replaced by waste sludge water in the amounts of 25%, 50%, 75% and 100%. Laboratory tests that are defined in ČSN EN 1008 standard were performed in order to determine the effect of partial or complete replacement of mixing water. The test specimens were further subjected to the effect of CO2 in the Lamart laboratory chamber, where the effect of CO2 was simulated for the period 50 years. Subsequently, the cement composites were tested for their strength characteristics (tensile flexural strength, compressive strength) and subjected to a mineralogical analysis. The results show that the effect of CO2 will reduce the strength characteristics of the composite compared to the comparative samples.

show abstract

“…(POPESCU et al, 2014;TONOLI et al, 2016). Os carbonatos mais cristalizados se decompõem em temperaturas entre 750 a 950°C (KIM et al, 2013;TONOLI et al, 2019 -GONZÁLEZ et al, 2006;KIM et al, 2013;TONOLI et al, 2016). As reações entre Ca(OH)2 e H2CO3 formam diferentes fases de CaCO3, como carbonato de cálcio amorfo, vaterita, aragonita e calcita.…”

Section: Resultados E Discussõesunclassified

“…O grau de carbonatação (GC) é um indicador que pode ser calculado por meio dos resultados obtidos em análises termogravimétricas. Estudos vem sendo realizados para quantificar os teores de CO2 absorvido por uma matriz cimentícia, possibilitando estimar o grau de carbonatação (GC) que ocorre durante o processo de carbonatação (MATSUSHITA;AONO;SHIBATA, 2000;TONOLI et al, 2019)…”

unclassified

“…Seu ponto de viragem é em torno do pH 8,2 e 10. A matriz cimentícia apresenta um pH em torno de 13, pela presença do Ca(OH)2, Os valores resultantes são determinados em base não volátil e expressos em porcentagem(TONOLI et al, 2019).Os carbonatos já presentes no fibrocimento, provenientes do cimento e do calcário, foram deduzidos e o GC foi determinado por meio da Equação 12 (MATSUSHITA;…”

unclassified

See 1 more Smart Citation

Avaliação da influência de diferentes métodos de cura na permeabilidade e no desempenho físico-mecânico de telhas de fibrocimento reforçadas com fibras poliméricas

Fioroni¹

Self Cite

View full text Add to dashboard Cite

show abstract

Influence of the initial moisture content on the carbonation degree and performance of fiber-cement composites

Cited by 26 publications

References 32 publications

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

The effect of CO₂ on cement composites produced with an admixture of waste sludge water from a concrete plant

Avaliação da influência de diferentes métodos de cura na permeabilidade e no desempenho físico-mecânico de telhas de fibrocimento reforçadas com fibras poliméricas

Contact Info

Product

Resources

About

Influence of the initial moisture content on the carbonation degree and performance of fiber-cement composites

Cited by 26 publications

References 32 publications

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

Carbonation Behavior of Engineered Cementitious Composites under Coupled Sustained Flexural Load and Accelerated Carbonation

The effect of CO2 on cement composites produced with an admixture of waste sludge water from a concrete plant

Avaliação da influência de diferentes métodos de cura na permeabilidade e no desempenho físico-mecânico de telhas de fibrocimento reforçadas com fibras poliméricas

Contact Info

Product

Resources

About

The effect of CO₂ on cement composites produced with an admixture of waste sludge water from a concrete plant