Comparison of procedures for the evaluation of time dependent concrete diffusion coefficient model

Konečný, Petr; Lehner, Petr; Ghosh, Pratanu; Morávková, Zuzana; Tran, Quang

doi:10.1016/j.conbuildmat.2020.119535

Cited by 16 publications

(11 citation statements)

References 15 publications

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“…Similar studies were performed with ground granulated blast-furnace slag and coal fly ash [9,10]; when CFA and GBFS were finely ground (6000 cm 2 /g), the compressive strength gain for all ages was improved [11]. By contrast, Jeong et al [12] did not find any improvement in the mechanical performance.…”

Section: Introductionmentioning

confidence: 62%

Performance of Ground Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Exposed to Natural Carbonation

et al. 2021

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Ternary Portland cements are new cementitious materials that contain different amounts of cement replacements. Ternary Portland cements composed of granulated blast-furnace slag (GBFS), coal fly ash (CFA), and clinker (K) can afford some environmental advantages by lowering the Portland cement clinker use. Accordingly, this is an opportunity to reduce carbon dioxide emissions and achieve net-zero carbon emissions by 2050. Furthermore, GBFS and CFA possess pozzolanic properties and enhance the mechanical strength and durability at later ages. Compressive strength and natural carbonation tests were performed in mortar and concrete. Cement-based materials made with GBFS and/or CFA presented a delay in the compressive strength development. In addition, they exhibited lower carbonation resistance than that of mortar and concrete made with plain Portland cements. Concrete reinforcement remains passive in common conditions; however, it could be corroded if the concrete pore solution pH drops due to the carbonation process. Service life estimation was performed for the ternary cements regarding the carbonation process. This information can be useful to material and civil engineers in designing concretes made with these ternary cements.

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Section: Introductionmentioning

confidence: 62%

Performance of Ground Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Exposed to Natural Carbonation

et al. 2021

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“…The aging factors of NSC and HPC2 are almost the same, and the aging factor of HPC1 is considerably more favorable than the NSC value. A more detailed description of the testing and discussion of results can be found in [35][36][37].…”

Section: Durability Of Concretementioning

confidence: 99%

Comparative Study of High-Performance Concrete Characteristics and Loading Test of Pretensioned Experimental Beams

2021

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High-performance concrete (HPC) is subjected to wide attention in current research. Many research tasks are focused on laboratory testing of concrete mechanical properties with specific raw materials, where a mixture is prepared in a relatively small amount in ideal conditions. The wider utilization of HPC is connected, among other things, with its utilization in the construction industry. The paper presents two variants of HPC which were developed by modification of ordinary concrete used by a precast company for pretensioned bridge beams. The presented variants were produced in industrial conditions using common raw materials. Testing and comparison of basic mechanical properties are complemented with specialized tests of the resistance to chloride penetration. Tentative expenses for normal strength concrete (NSC) and HPC are compared. The research program was accomplished with a loading test of model experimental pretensioned beams with a length of 7 m made of ordinarily used concrete and one variant of HPC. The aim of the loading test was to determine the load–deformation diagrams and verify the design code load capacity calculation method. Overall, the article summarizes the possible benefits of using HPC compared to conventional concrete.

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“…where D c,nom,t is the nominal diffusion coefficient for a selected age (m 2 /s), m is the ageing factor describing the decrease of the diffusion coefficient over the period of measurement for concrete ages t (years) (e.g., 7, 14, 28, 56, 91, and 161 days), and t ref (years) is the age-related to the diffusion coefficient D c,ref at reference period e.g., 28 days. The reference parameters and the m factor might be computed according to [37]. The calculated ageing factor is shown in Table 2.…”

Section: Diffusion Coefficient Calculationmentioning

confidence: 99%

“…The deterministic diffusion coefficient model data are provided in Table 2 including the reference age of 28 days. However, the study [37] suggests that it needs to be evaluated if t ref 56 or 91 would not yield a better fit for the model. The deterministic diffusion coefficient model can be used as the nominal (mean) value for the probabilistic description.…”

Section: Diffusion Coefficientmentioning

confidence: 99%

Variation of Durability and Strength Parameters of Pumice Based Mixtures

2021

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The numerical modelling of chloride penetration into concrete is very sensitive to the correct description of the input data. In the recent era, high-performance concrete (HPC), which combines Portland cement and other supplementary cementitious materials, has been gaining attraction due to their desirable material properties and durability. The presented results show the application of the modified approach for the evaluation of the suitability of the time-dependent model for the variation of the diffusion coefficient. The 26 various binary and ternary-based concrete mixtures blended with volcanic pumice pozzolan (VPP) as a major supplementary cementitious material (SCM) are compared with the reference Ordinary Portland Cement mixture. Other SCMs namely fly ash, slag, silica fume, and metakaolin were also utilized in ternary-based concrete mixtures. In-depth statistical analysis was carried out to show the variability and effects of the amount of the volcanic pumice as an SCM on the diffusion coefficient. The mean value and regression via linear approximation of the time-dependent coefficient of variation of the diffusion coefficients were used as well as the Root of Mean Squared Error approach. The presented results are suitable as the component of the input parameters for the durability-related probabilistic assessment of the reinforced concrete structures exposed to chlorides. In addition, the time-dependent ultimate limit state-related data was presented.

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Comparison of procedures for the evaluation of time dependent concrete diffusion coefficient model

Cited by 16 publications

References 15 publications

Performance of Ground Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Exposed to Natural Carbonation

Performance of Ground Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Exposed to Natural Carbonation

Comparative Study of High-Performance Concrete Characteristics and Loading Test of Pretensioned Experimental Beams

Variation of Durability and Strength Parameters of Pumice Based Mixtures

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