Modeling the hydration of concrete incorporating fly ash or slag

Wang, Xiao-Yong; Lee, Han-Seung

doi:10.1016/j.cemconres.2010.03.001

Cited by 186 publications

(150 citation statements)

References 46 publications

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“…The compound formula of CSH produced from cement hydration is C 1.7 SH 4 [16]. CSH produced from fly ash reaction has a lower Ca/Si ratio than that produced from cement hydration, and the compound formula of CSH produced from fly ash is C 1.1 SH 3.9 [16] (Ca/Si ratio also depends on the type of fly ash; this point is not considered in this study). The S in cement and fly ash will form CSH [17].…”

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 94%

“…On the other hand, the rate of binder hydration is significantly influenced by relative humidity. When the relative humidity is less than 80%, cement hydration virtually ceases [16]. Hence, further hydration in the carbonation zone of concrete is marginal and can be ignored.…”

Section: Carbonation Depth In Accelerated Carbonation Testsmentioning

confidence: 99%

“…where C 0 is the mass of cement, CH CE is the mass of CH produced by the hydration of unit mass of the cement, α denotes the degree of hydration of cement (C 0 × CH CE × α considers the production of CH from cement hydration), P is the mass of fly ash, ν FA is the stoichiometric ratio of the masses of CH and fly ash (v FA = 0.845 − 0.7 × P P+C 0 [16]), and α FA denotes the degree of reaction of fly ash (P × ν FA × α FA accounts for the consumption of calcium hydroxide from the fly ash reaction).…”

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 99%

“…The amount of carbonatable materials such as calcium hydroxide (CH) and calcium silica hydrate (CSH) in concrete depends on the binder content in concrete mixing proportions and reaction degree of the binders. In our previous study [16], a blended-cement hydration model was proposed to simulate the kinetic hydration process of cement-fly ash blends. The volumetric phase fractions of hardening blended concrete are evaluated using reaction degrees of the binders.…”

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 99%

“…The volumetric phase fractions of hardening blended concrete are evaluated using reaction degrees of the binders. For cement-fly ash blends, the CH content can be determined as follows [16]:…”

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 99%

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Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study

Park

Wang

2017

Sustainability

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Abstract:The increase in CO 2 concentrations and global warming will increase the carbonation depth of concrete. Furthermore, temperature rise will increase the rate of corrosion of steel rebar after carbonation. On the other hand, compared with normal concrete, high volume fly ash (HVFA) concrete is more vulnerable to carbonation-induced corrosion. Carbonation durability design with climate change is crucial to the rational use of HVFA concrete. This study presents a probabilistic approach that predicts the service life of HVFA concrete structures subjected to carbonation-induced corrosion resulting from increasing CO 2 concentrations and temperatures. First, in the corrosion initiation stage, a hydration-carbonation integration model is used to evaluate the contents of the carbonatable material, porosity, and carbonation depth of HVFA concrete. The Monte Carlo method is adopted to determine the probability of corrosion initiation. Second, in the corrosion propagation stage, an updated model is proposed to evaluate the rate of corrosion, degree of corrosion for cover cracking of concrete, and probability of corrosion cracking. Third, the whole service life is determined considering both corrosion initiation stage and corrosion propagation stage. The analysis results show that climate change creates a significant impact on the service life of durable concrete.

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Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 94%

Section: Carbonation Depth In Accelerated Carbonation Testsmentioning

confidence: 99%

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 99%

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 99%

Section: Corrosion Initiation Due To Carbonationmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study

Park

Wang

2017

Sustainability

Self Cite

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Void ratio and durability properties of porous polymer concrete using recycled aggregate with binder contents for permeability pavement

Sung

Kim

2012

J of Applied Polymer Sci

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Particularly in Korea, where most roads are paved with impermeable materials such as asphalt and cement concrete, problems arise such as increased flooding as result of rainwater flowing into urban streams and the depletion of underground water. In recent years, there has been a great deal of ongoing research concerning water permeability and drainage in pavements. Accordingly, in this research, a porous polymer concrete was developed by using unsaturated polyester resin as a binder, recycled aggregate as coarse aggregate, fly ash and blast-furnace slag as filler for permeable pavement, and its physical and mechanical properties were investigated. Regardless of the type of filler and amount of binder, the standard void ratio of 8% specified in the mixture of permeable asphalt was exceeded. In all mixes, regardless of the type of filler and amount of binder, the standard compressive strength for permeable concrete of 18 MPa was exceeded. Also, in all mixes, the standard permeability coefficient of 1.0 Â 10 À2 cm/s for permeable asphalt mixture was exceeded. The weight reduction ratio of the porous polymer concrete that was submerged in 10% sulfuric acid solution was 1.17 to 2.3%, and it was found that there was virtually no weight reduction. V C 2012Wiley Periodicals, Inc. J Appl Polym Sci 126: E338-E348, 2012

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Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Tian,

Chen,

Han

et al. 2023

Deep Underground Science and Engineering

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The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CUC) grouts to reinforce the roadway in fractured surrounding rocks. The materials used are ultrafine cement (UC), ultrafine fly ash (UF), ultrafine slag (US), and additives (superplasticizer [SUP], aluminate ultrafine expansion agent [AUA], gypsum, and retarder). The fluidity, bleeding, shrinkage, setting time, chemical composition, microstructure, degree of hydration, and mechanical property of grouting materials were evaluated in this study. Also, a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock. The results have shown that the addition of UF and US reduces the plastic viscosity of CUC, and the best fluidity can be obtained by adding 40% UF and 10% US. Since UC and UF particles are small, the pozzolanic effect of UF promotes the hydration reaction, which is conductive to the stability of CUC grouts. In addition, fine particles of UC, UF, and US can effectively fill the pores, while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout. The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts. Finally, the CUC22‐8 grout was used to reinforce the No. 20322 belt roadway. The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway. In this research, high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives.

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Modeling the hydration of concrete incorporating fly ash or slag

Cited by 186 publications

References 46 publications

Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study

Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study

Void ratio and durability properties of porous polymer concrete using recycled aggregate with binder contents for permeability pavement

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

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