Searching for Durable and Friendly Alkali Activated Concrete for Building Elements Constructions

Bílek, Vlastimil; Hurta, Jan; Žídek, Libor; Mec, Pavel

doi:10.4028/www.scientific.net/amr.1098.126

Cited by 5 publications

(6 citation statements)

References 4 publications

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“…This finding corresponds to general knowledge of the densifying effect of hydration and its contribution to the mechanical perfor- mance [6,33,47]. Inclusion of the effect of hydrates leads to a better fit with the freeze-thaw resistance in comparison with entirely chemically bound water [43]. However, the dominant factor determining the freeze-thaw resistance of concrete or its gradual deterioration is the character of the pore system.…”

Section: Resultssupporting

confidence: 81%

“…Pastes with addition of blast furnace slag exhibited relatively retarded evolution of hydration and, after 90 days, even reached the highest content of hydration products of the studied SCMs. These samples also contained the largest amount of bound water, which is often related to reduced freeze-thaw resistance due to high density [43]. This relation was not confirmed for the obtained frost resistance.…”

Section: Resultsmentioning

confidence: 80%

“…The exact boundaries of decomposition were read from the derivative curves (DTG). A similar procedure was used in [42,43]. The amount of water bound in the CSH and CAH hydrates was calculated as the difference between the total amount of bound water and the water bound in portlandite (Eq.…”

Section: Thermogravimetrymentioning

confidence: 99%

See 2 more Smart Citations

Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials

Reiterman

Holčapek

Zobal

et al. 2019

Reviews on Advanced Materials Science

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This paper describes a study of the effect of partial replacement of ordinary Portland cement (OPC) by various mineral additives in the screed mixtures. Ceramic powder, blast furnace slag and fly ash were gradually employed in increments of 12.5 wt.% up to 50 wt.% to replace OPC. The mixtures were designed to a constant consistency. The influence of mineral additives was evaluated in terms of the air content in the fresh mixtures, the compressive strength, the flexural strength and the freeze-thaw resistance and using non-destructive measurements after 28 and 90 days. The accompanied paste sampleswere analysed using thermogravimetry to monitor the hydration process by means of total bound water content. The decrease in the mechanical properties and the frost resistance of the mixtures with the mineral additives were recorded, because of the necessity for a larger addition of water. According to the valid standards for concrete screed related to the frost resistance, it could be concluded that maximal suitable cement replacement contents are 12.5, 37.5 and 50 wt.% for ceramic powder, fly ash and blast furnace slag, respectively. The freeze-thaw resistance of the studied materials was found to be strongly related to the content of CSH and CAH hydrates.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 80%

See 1 more Smart Citation

Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials

Reiterman

Holčapek

Zobal

et al. 2019

Reviews on Advanced Materials Science

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show abstract

“…The frost resistance of AAC concrete, like OPC concrete, depends on the type of binder used and the concrete's various mix proportion parameters [44]. Sodium silicate is reported to have a better frost resistance than other activators such as sodium carbonate [39,45].…”

Section: Freeze-thaw Resistancementioning

confidence: 99%

Mechanical Behavior and Frost-Resistance of Alkali-Activated Cement Concrete with Blended Binder at Ambient Curing Condition

et al. 2021

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Concrete is the most commonly used construction material because of its various advantages, such as versatility, familiarity, strength, and durability, and it will continue to be in demand far into the future. However, with today’s sensitivity to environmental protection, this material faces unprecedented challenges because of its high greenhouse gas emissions, mainly during cement production. This paper investigates one of the promising cement replacement materials, alkali-activated cement (AAC) concrete. Being produced mainly from byproduct materials and having a comparable structural performance to conventional concrete, AAC concrete can transform the construction industry. Mechanical properties such as compressive and flexural strength and the relationship between them are studied. Different source materials such as fly ash (FA), ground granulated blast furnace slag (GGBS), silica fume (SF), and Metakaolin (MK) are used. The effect of the source materials and the activator solutions on the concrete performance is studied. Furthermore, the freeze-thaw resistance of the concrete is studied. The study results showed that the behavior of AAC depends highly on the source material combinations and type used. The effect of the alkaline solution is also dependent on the source material used. Mixes with higher GGBS content showed the highest strength, while mixes with MK showed the highest flexural strength. The freeze-thaw test results showed that proper design of AAC concrete with lower water content is critical to achieving a good resistance.

show abstract

“…The frost resistance of AAC like OPC depends on the type of binder used and the various mix proportion parameters of the concrete [38]. Sodium silicate is reported to have a better frost resistance than other activators such as sodium carbonate [34,39].…”

Section: Freeze-thaw Resistancementioning

confidence: 99%

Mechanical Behaviors and Frost-Resistance of Alkali Activated Cement Concrete with Different Binder Systems

Tekle¹,

Holschemacher²,

Löber³

et al. 2020

Preprint

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Concrete is the most commonly used construction material due to its various advantages, such as versatility, familiarity, strength and durability and it will continue to be in demand far into the future. However, with today’s sensitivity to the environmental protection, this material is facing unprecedented challenges due to its high greenhouse gas emission mainly during cement production. This paper investigates one of the promising cement replacement materials, alkali activated cement (AAC) concrete. Being produced mainly from byproduct materials and having a comparable structural performance to conventional concrete, AAC concrete has a potential to transform the construction industry. Mechanical properties such as compressive and flexural strength and the relationship between them are studied. Different source materials such as fly ash (FA), ground granulated blast furnace slag (GGBS), silica fume (SF) and Metakaolin (MK) are used. The effect of the source materials and the activator solutions on the concrete performance is studied. Furthermore, the freeze-thaw resistance of the concrete is studied. The results of the study showed that the behavior of AAC depends highly on the source material combinations as well as type used. The effect of the alkaline solution is also dependent on the source material used. Mixes with higher GGBS content in general showed the highest strength while mixes with MK showed the highest flexural strength. The results from the freeze-thaw test showed that proper design of AAC concrete with a lower water content is critical to achieve a good resistance.

show abstract

Searching for Durable and Friendly Alkali Activated Concrete for Building Elements Constructions

Cited by 5 publications

References 4 publications

Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials

Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials

Mechanical Behavior and Frost-Resistance of Alkali-Activated Cement Concrete with Blended Binder at Ambient Curing Condition

Mechanical Behaviors and Frost-Resistance of Alkali Activated Cement Concrete with Different Binder Systems

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