Efficiency of Composite Binders with Antifreezing Agents

Ogurtsova, Yulia N.; Zhernovsky, I.; Botsman, L.N.

doi:10.1088/1757-899x/262/1/012029

Cited by 7 publications

(6 citation statements)

References 1 publication

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“…Additionally, at a constant freezing temperature, the concentration and strength of the ice lenses have been observed to increase exponentially [84]. Consequently, the internal pressure created by the developed pore ice could result in microcracking of the already-formed binder matrix [85][86][87]. Alzaza et al reported that concretes with 40 wt% of OPC with CSA cement where no pre-curing was applied showed a limited strength development for concrete cured at −5 • C [79].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Early Age Performance of OPC-GGBFS-Concretes Containing Belite-CSA Cement Cured at Sub-Zero Temperatures

Kothari,

Buasiri,

Cwirzen

2023

Buildings

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This study determined how replacing sodium nitrate-based antifreeze admixture (AF) with belite-calcium sulfoaluminate (belite-CSA) cement affects the early age properties of ecological concretes based on ordinary Portland cement (OPC) and ground granulated blast-furnace slag (GGBFS). Concrete specimens were cured at −15 °C and treated in various ways before testing, i.e., no treatment, stored at 20 °C for 12 and 24 h. Generally, the addition of belite-CSA cement shortened the setting time due to the rapid formation of ettringite. The incorporation of 25 wt% of antifreeze admixture (AF) to the OPC-GGBFS concrete cured at −15 °C partially inhibited ice formation and enabled the continuation of hydration processes. This trend was observed for all samples, independent of the applied AF after freezing curing. On the contrary, the addition of 20 wt% of CSA failed to inhibit the ice formation and increased the risk of frost damage for concretes despite the treatment after freezing. These concrete specimens had lower hydration, lower strength, and a more porous binder matrix. The microstructure of the binder matrix was significantly affected by the amount of CSA and extreme negative curing, followed by no notable recovery post-curing at room temperature. Therefore, pre-curing at room temperature for at least 6 h has the potential to avoid frost damage. Concrete containing 25 wt% AF combined with 12 h and 24 h of curing at 20 °C after removal from freezing and prior to testing could enhance the compressive strengths of all concretes. The renewed hydration was indicated as the main influencing factor.

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Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Early Age Performance of OPC-GGBFS-Concretes Containing Belite-CSA Cement Cured at Sub-Zero Temperatures

Kothari,

Buasiri,

Cwirzen

2023

Buildings

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“…Another possibility is the optimization of the concrete mix by the rapid hardening of Portland cement and various types of chemical admixtures, which has the potential to develop higher hydration heats and lower the freezing point of water [1,15,16]. Apparently, this procedure simplifies concrete production in moderately cold climatic conditions without the need of any internal or external heating, isolative covers or tents [7,9,[17][18][19]. However, to prevent early permanent damage, the concrete should reach a critical compressive strength of 3.5 MPa before or during exposure to frost conditions [13,20].…”

Section: Admixture Years Referencementioning

confidence: 99%

“…The mixes with either 50 wt% or 30 wt% replacement by ground feldspar and sand reached strength values of 32.16–34.05 MPa and 46.48–46.69 MPa for 4% to 5% of admixture after 28 days. The strength gain is mainly attributed to the fusion between the admixture and cement, resulting in the dissolution of silica compounds from cement and consequently forming salt structures and maintaining the liquid phases in freezing temperatures [ 9 , 17 ]. Sadowski et al (2020) studied air-entrained concretes containing between 10 wt% and 30 wt% of either quartz–feldspar or basalt mineral powders, cured at standard conditions.…”

Section: Composite Portland Cement-based Concretesmentioning

confidence: 99%

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A Review of the Mechanical Properties and Durability of Ecological Concretes in a Cold Climate in Comparison to Standard Ordinary Portland Cement-Based Concrete

et al. 2020

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Most of the currently used concretes are based on ordinary Portland cement (OPC) which results in a high carbon dioxide footprint and thus has a negative environmental impact. Replacing OPCs, partially or fully by ecological binders, i.e., supplementary cementitious materials (SCMs) or alternative binders, aims to decrease the carbon dioxide footprint. Both solutions introduced a number of technological problems, including their performance, when exposed to low, subfreezing temperatures during casting operations and the hardening stage. This review indicates that the present knowledge enables the production of OPC-based concretes at temperatures as low as −10 °C, without the need of any additional measures such as, e.g., heating. Conversely, composite cements containing SCMs or alkali-activated binders (AACs) showed mixed performances, ranging from inferior to superior in comparison with OPC. Most concretes based on composite cements require pre/post heat curing or only a short exposure to sub-zero temperatures. At the same time, certain alkali-activated systems performed very well even at −20 °C without the need for additional curing. Chemical admixtures developed for OPC do not always perform well in other binder systems. This review showed that there is only a limited knowledge on how chemical admixtures work in ecological concretes at low temperatures and how to accelerate the hydration rate of composite cements containing high amounts of SCMs or AACs, when these are cured at subfreezing temperatures.

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“…Today, a promising and most effective way to increase the efficiency of composites is the use of composite binders: fine-grained multicomponent cement (FGMC) and low water demand binder (LWDB). The production of such highly disperse and mechanically activated binders leads to a reduction in cement consumption in the material and an increase in its performance characteristics [1][2][3][4][5][6][7][8][9]. However, in the absence of the necessary knowledge of the interrelation of the structure, the physico-topological state and the structure with the properties of the material, it is impossible to fully predict the behavior of the material under operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural Topological Characteristics of Mechanically Activated Sialic Raw Materials

NELYUBOVA

Строкова

Popov

et al. 2019

MSF

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Efficiency of Composite Binders with Antifreezing Agents

Cited by 7 publications

References 1 publication

Early Age Performance of OPC-GGBFS-Concretes Containing Belite-CSA Cement Cured at Sub-Zero Temperatures

Early Age Performance of OPC-GGBFS-Concretes Containing Belite-CSA Cement Cured at Sub-Zero Temperatures

A Review of the Mechanical Properties and Durability of Ecological Concretes in a Cold Climate in Comparison to Standard Ordinary Portland Cement-Based Concrete

Investigation of the Structural Topological Characteristics of Mechanically Activated Sialic Raw Materials

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