Influence of Permeability-Reducing Admixtures on Water Penetration in Concrete

Hassani, E Mohammadreza; Vessalas, K; Sirivivatnanon, V.; Baweja, Daksh

doi:10.14359/51701002

Cited by 9 publications

(18 citation statements)

References 9 publications

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“…In the study by Joa et al [20], 3% crystalline admixtures in mortars provided a reduction in porosity and water absorption. On the other hand, Hassani et al [16] found no considerable difference in the results of water absorption in concretes containing 1% crystalline admixtures at 28 days.…”

Section: Capillarity Water Absorptionmentioning

confidence: 93%

Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures

et al. 2020

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Reinforced concrete structures are prone to cracking. The development of cementitious matrices with the capacity for self-healing soon after these cracks appear represents savings with inspections and repairs of the structures. Self-healing can be stimulated with the use of crystalline admixtures. Such materials easily react with water and increase the density of C-S-H (hydrated-calcium-silicate), forming insoluble deposits blocking existing pores and cracks. In this research, self-healing in concrete cracks was evaluated using three different crystalline admixtures, submitted to two and six wetting–drying cycles. The efficiency of self-healing was evaluated by optical microscopy and using the chloride diffusion test, which allowed calculating the predicted useful life of the concretes. The results highlight two important findings: (i) in optical microscopy, crystalline admixtures were not efficient in promoting self-healing on the surface of cracks in any of the studied concretes; (ii) the passage of chlorides by diffusion was lower for concretes with crystalline admixtures compared to the reference, showing better internal healing of these materials and, consequently, greater prediction of the concrete’s useful life.

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Section: Capillarity Water Absorptionmentioning

confidence: 93%

Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures

et al. 2020

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“…In general, Azarsa et al [12] found typical hydration phases such as C-S-H and CH; AFt crystals were also distinguished depending on the type of CAs. Esgandani et al [16] also suggested the intensified C-S-H production booted by the silica fume present in CAs composition. Finally, Hrbek et al [11] proposed the formation of C-S-H with low density caused by the incorporation of CaCO 3 and modified C 3 S in cement pastes with CA, based on the correlation between SEM and nanoindentation analysis.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 97%

“…However, some homemade formulations are based on carbonates, silicates, aluminates, tetrasodium EDTA, glycine and sodium acetate [34,37,45,47,48,66]. Generally, the regular use of this type of admixture is based on the information provided by the producers [16]. The diversity of manufactures increases the challenge to disclose eventual mechanisms or predict the behavior promoted by CAs.…”

Section: Chemical Nature Of Crystalline Admixturesmentioning

confidence: 99%

“…This mechanism is described by Eq. (1), and it also referenced in many works [6,7,11,16,20,24,29,30,62,[71][72][73][74]:…”

Section: Mechanisms Of Action Of Crystalline Admixturesmentioning

confidence: 99%

“…[7] also suggested the processing of pozzolanic reactions promoted by CAs, based on the identification of C-S-H by SEM/EDS. Likewise, Esgandani et al [16] attributed the refinement of the concrete pore to the replacement of CH by C-S-H based on the presence of active silica in CAs by the FTIR spectrum. However, according to Sisomphon et al [43], the primary mechanisms for an external closure of the crack is the formation of calcium carbonate (CaCO 3 ) stimulated by the presence of CA, which in turn promotes the dissolution of Ca 2+ ions from the matrix.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

See 2 more Smart Citations

An overview of a twofold effect of crystalline admixtures in cement-based materials: from permeability-reducers to self-healing stimulators

Oliveira

Gomes

Ferrara

et al. 2021

Journal of Building Engineering

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Effect of crystalline admixture on early‐age residual stress and cracking potential of high‐strength concrete

Feng

Shen

Zhang

et al. 2022

Structural Concrete

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Crystalline admixture (CA) has been extensively utilized as the commercial product for improving the performance associated with strengthening selfsealing of cracks or decreasing the permeability of concrete. However, few researches characterizing the restrained shrinkage and cracking potential of concrete with CA at early age. This paper aimed to expand the limitation by means of the experiments including mechanical properties test and restrained ring test on high-strength concrete (HSC) with CA from Xypex. The proportion of CA was 0%, 0.5%, 1.0%, and 1.5% by the mass of cement. The incorporation of CA enhanced the compressive and splitting tensile strength as well as modulus of elasticity tested in this paper. A significant increase was observed in free and restrained shrinkage of HSC with CA. Although incorporation of CA ameliorated the stress relaxation, residual stress in restrained concrete ring developed rapidly with the incorporation of CA due to the significant increase in restrained shrinkage at early age. Restrained concrete ring with CA demonstrated a higher stress rate, which implied a higher cracking potential. When CA proportion increased from 0% to 0.5%, 1.0%, and 1.5%, a higher cracking potential was revealed through calculation, and restrained concrete ring exhibited earlier cracking age. Caution should be exercised with the application of such CA in concrete mixtures under restrained conditions.

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Influence of Permeability-Reducing Admixtures on Water Penetration in Concrete

Cited by 9 publications

References 9 publications

Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures

Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures

An overview of a twofold effect of crystalline admixtures in cement-based materials: from permeability-reducers to self-healing stimulators

Effect of crystalline admixture on early‐age residual stress and cracking potential of high‐strength concrete

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