Carbonation resistance of cements containing supplementary cementitious materials and its relation to various parameters of concrete

Shah, Vineet; Bishnoi, Shashank

doi:10.1016/j.conbuildmat.2018.05.162

Cited by 111 publications

(64 citation statements)

References 38 publications

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“…Conversely, according to (8), excess ingress of CO 2 attacks CSH resulting in its disintegration and subsequent loss of strength in cement based structures [35]. Additionally, during carbonation, OHpresent in CH is consumed resulting in the decrease of pore solution pH [36].…”

Section: Carbonation Processmentioning

confidence: 99%

“…In case of reinforced concrete, reduction in the pH value leads to the destruction of protective passive surface layer around steel reinforcement resulting in rebar corrosion [36]. In areas with high concentration of dissolved CO 2 for example in estuaries, the effects of carbonation are more deleterious since carbonic water is more acidic in seawater than fresh water [37].…”

Section: Carbonation Processmentioning

confidence: 99%

“…RH determines the quantity of atmospheric water upon which cement based material is exposed during curing [31,36,[40][41][42]. The existing water in the hydrated cementitious system especially during curing process primarily depends on the pore network as well as external RH.…”

Section: Factors Affecting Carbonation Resistancementioning

confidence: 99%

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Review of Carbonation Resistance in Hydrated Cement Based Materials

Marangu

Thiong’o

Wachira

2019

Journal of Chemistry

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Blended cements are preferred to Ordinary Portland Cement (OPC) in construction industry due to costs and technological and environmental benefits associated with them. Prevalence of significant quantities of carbon dioxide (CO2) in the atmosphere due to increased industrial emission is deleterious to hydrated cement materials due to carbonation. Recent research has shown that blended cements are more susceptible to degradation due to carbonation than OPC. The ingress of CO2 within the porous mortar matrix is a diffusion controlled process. Subsequent chemical reaction between CO2 and cement hydration products (mostly calcium hydroxide [CH] and calcium silicate hydrate [CSH]) results in degradation of cement based materials. CH offers the buffering capacity against carbonation in hydrated cements. Partial substitution of OPC with pozzolanic materials however decreases the amount of CH in hydrated blended cements. Therefore, low amounts of CH in hydrated blended cements make them more susceptible to degradation as a result of carbonation compared to OPC. The magnitude of carbonation affects the service life of cement based structures significantly. It is therefore apparent that sufficient attention is given to carbonation process in order to ensure resilient cementitious structures. In this paper, an indepth review of the recent advances on carbonation process, factors affecting carbonation resistance, and the effects of carbonation on hardened cement materials have been discussed. In conclusion, carbonation process is influenced by internal and external factors, and it has also been found to have both beneficial and deleterious effects on hardened cement matrix.

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Section: Carbonation Processmentioning

confidence: 99%

Section: Carbonation Processmentioning

confidence: 99%

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Review of Carbonation Resistance in Hydrated Cement Based Materials

Marangu

Thiong’o

Wachira

2019

Journal of Chemistry

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“…It was also applied to produce kaolin-based cement plug as an alternative to OPC plugs for upstream carbon sequestration [6]. Its current use as supplementary cementitious materials is on the increase [7][8][9][10][11][12][13]. This is due to global demand for cement by construction and building industry.…”

Section: Introductionmentioning

confidence: 99%

Characterization of raw and thermally treated Nigerian kaolinite-containing clays using instrumental techniques

et al. 2020

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Thermal behavior, surface area, oxide, mineralogical composition, and structural functional groups of raw and thermally treated five local kaolin clays [Ijero-Ekiti (IJ), Ikere-Ekiti (IK), Isan-Ekiti (IS), Abusoro (AB) and Odigbo (OD)] from two states in SouthWest Nigeria were studied in order to determine their potential uses. These properties were measured using thermogravimetric analysis coupled with differential thermal analysis (TGA/DTA), surface area and porosity analysis, X-ray fluorescence (XRF), X-Ray Diffractometry (XRD) and Fourier Transform infra-red spectroscopy (FTIR) respectively. The TGA/ DTA showed major mass losses and broad endothermic bands at temperatures 390-700 °C, which were associated with dehydroxylation of kaolinite and other clay minerals. Thermal treatment increased the surface area of the raw clays. The XRF results showed oxides of kaolinite, illite, quartz, feldspar, hematite, anatase and the phases were confirmed by XRD. The FTIR spectra displayed the characteristic absorption bands of the minerals. Combining the obtained results, Ijero-Ekiti clay was identified as feldspar (albite)-quartz containing clay, Ikere-Ekiti and Isan-Ekiti clays as kaolinite-dominated clays, Abusoro clay as kaolinite-illite-montmorillonite-containing clay and Odigbo clay as kaolinite-illite-containing clay. The TGA/DTA, XRD and FTIR indicated that crystalline kaolinite in the clays were converted into amorphous metakaolinite after thermal treatment. Based on the properties displayed, clays from IK, IS, AB and OD deposits can be thermally treated to form useful supplementary cementitious and geopolymer materials to make binders in building and construction while clay from IJ deposit can be a potential raw material for ceramic production.

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“…The concentration of the CO2 employed was very high. It is known that the carbonation coefficient increases with an increase in carbon dioxide concentration (Shah and Bishnoi, 2018). In addition, at long test periods, the high concentrations of CO2 cause a change of the cement paste microstructure compared to that of samples placed in natural exposure (Castellote et al, 2009).…”

Section: Carbonation and Chloride Resistancementioning

confidence: 99%

Influence of High Volume Fly Ash and Recycled Aggregates in Chloride and Carbonation Resistance of Concrete

Etxeberria¹,

Álvarez²

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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This paper deals with the evaluation of the influence of recycled concrete aggregate (RCA) and the employment of high volume of fly ash (FA) on the physical, mechanical and durability (chloride ion penetration and carbonation) properties of concretes. The obtained values of which, being compared to those of conventional concretes. Concrete was produced using 0%, 25% and 50% FA in replacement of Portland cement, and 0% and 50% of RCA in substitution of natural aggregates. All the concretes were produced employing an effective water-cement ratio of 0.50. The physical properties at 28 days and the compressive strength at 7, 28 and 90 days were determined in all the concretes produced as well as the assessment of durability (penetration of chlorides and depth of carbonation) on all concrete mixtures. The depth of the carbonation was determined after submitting every concrete sample to a series of accelerated tests at 20% of CO2 concentration during 7, 14 and 28 days after the curing period in the humidity room and precondition in the laboratory. The chloride penetration was determined at 28 and 90 days of curing. It was concluded that the employment of 50% of un-carbonated RCA increased the early strength of concrete produced using FA, and at late ages, RCA concretes achieved similar strength when 25% of FA was employed. The concrete produced with 50% of FA achieved the highest resistance to chloride ion penetration also when RCA was employed. Although the use of FA increased the carbonation depth of the concrete samples, the employment of the un-carbonated RCA reduced that effect. The employment of RCA with CEM II or binder with 25% of FA caused the lowest carbonation depth.

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Carbonation resistance of cements containing supplementary cementitious materials and its relation to various parameters of concrete

Cited by 111 publications

References 38 publications

Review of Carbonation Resistance in Hydrated Cement Based Materials

Review of Carbonation Resistance in Hydrated Cement Based Materials

Characterization of raw and thermally treated Nigerian kaolinite-containing clays using instrumental techniques

Influence of High Volume Fly Ash and Recycled Aggregates in Chloride and Carbonation Resistance of Concrete

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