Variations in the composition and relations between alkali-silica gels and calcium silicate hydrates in highway concrete

Frýbort, Aleš; Všianský, Dalibor; Štulířová, Jana; Stryk, Josef; Gregerová, Miroslava

doi:10.1016/j.matchar.2018.01.012

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…This is shown when SF and MK reduce the permeability of the composite and minimizing the creation of Ca(OH) 2 [54,55]. SF is effective in mitigating the risk of the alkali-silica reaction (ASR) which can deteriorate concrete materials [56,57]. SF reacts with the free alkalis in cement, effectively binding them together and reducing their availability for reaction with reactive silica in the aggregates.…”

Section: Microstructure Investigationsmentioning

confidence: 99%

The Thermo-Phase Change Reactivity of Textile and Cardboard Fibres in Varied Concrete Composites

Haigh,

Sandanayake,

Joseph

et al. 2024

Sustainability

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The building and construction industry heavily relies on the use of concrete and cementitious composites due to their exceptional attributes, including strength and durability. However, the extensive use of these materials has led to significant environmental challenges, including resource depletion, carbon emissions, and waste accumulation. In response to these challenges, recent advancements in fibre cementitious composites have shown promise in mitigating these detrimental effects. The integration of waste materials to supplement manufactured fibres represents a promising development in reinforced concrete composite materials. Waste materials like textiles and cardboard are emerging as potential fibre supplements in cementitious composites. While these materials have primarily been investigated for their mechanical characteristics, understanding their thermal properties when applied in construction materials is equally crucial. Incorporating fibres within composite designs often requires matrix modification to reduce degradation and enhance fibre longevity. This study aims to investigate the thermo-phase change properties of both textile and cardboard fibres within varied concrete matrices. Additive materials offer a range of advantages and challenges when used in composite materials, with additional complexities arising when incorporating fibre materials. Understanding the thermal reactivity of these materials is crucial for optimizing their application in construction. This study demonstrates the potential of waste fibres used with gypsum, metakaolin, and silica fume as matrix modifiers in concrete. This research provides valuable insights for future studies to explore specific material combinations and investigate complex fire testing methods, ultimately contributing to the development of sustainable construction materials.

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Section: Microstructure Investigationsmentioning

confidence: 99%

The Thermo-Phase Change Reactivity of Textile and Cardboard Fibres in Varied Concrete Composites

Haigh,

Sandanayake,

Joseph

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

“…The identification of the degradation product can be made in a chipped concrete sample within minutes. It is possible, with the use of another device, to perform other more detailed analyses which are focused on a specific issue [14].…”

Section: Micro Chemical Analysesmentioning

confidence: 99%

Complementary analyses of concrete characteristics performed on cores taken from concrete pavements

2020

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The basic assessment of cement concrete pavement condition is performed by a visual inspection, when the surface faults which are macroscopically distinguishable are documented. Detailed data on concrete condition require further tests performed on cores. Apart from common standard tests, such as layer thickness, compressive and tensile strength, resistance against water and chemical defrosting agents, other macroscopic and microscopic analyses have become useful. Some of the most important ones include petrographic assessment of aggregates (based on the fraction and type of rocks), quantification of cracks (expressed by e.g. cracking index or damage rating index), analyses of air void characteristics in concrete (expressed by e.g. spacing factor test), indication of type and extent of expansion reactions with the help of chemical reagents that visually mark the affected concrete parts. The information can be complemented and adjusted through a suitable combination of microscopic methods. Prepared thin sections are used to determine types of aggregates including the specification of its harmfulness. In combination with concrete fragments taken at least from three height levels of the core (surface-centre-bottom), differences or conformity of concrete porousness, and level and type of mineralization of pores and cracks created by secondary phases, are determined. The identification of created phases and their correlation with applied aggregates can be used for prediction of potential risks. The paper describes additional test methods that can be performed on cores from concrete structures and that are based on macroscopic and microscopic analyses.

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“…The presence of Ca in the gel ensures its high viscosity and swelling upon the imbibition of water. Otherwise, the gel dissolves and remains in the solution [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

Alkali–Silica Reactions: Literature Review on the Influence of Moisture and Temperature and the Knowledge Gap

Olajide,

Nokken,

Sanchez

2023

Materials

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The alkali–silica reaction is a universally known destructive mechanism in concrete that can lead to the premature loss of serviceability in affected structures. Quite an enormous number of research studies have been carried out focusing on the mechanisms involved as well as the mitigation and prevention of the reaction. A few in-depth discussions on the role of moisture and temperature exist in the literature. Nevertheless, moisture and temperature have been confirmed to play a vital role in the reaction. However, critical assessments of their influence on ASR-induced damage are limited. The available moisture in concrete needed to initiate and sustain the reaction has been predominantly quantified with the relative humidity as a result of difficulties in the use of other media, like the degree of capillary saturation, which is more scientific. This paper discussed the current state of understanding of moisture measurement in concrete, the role of moisture and temperature in the kinetics of the reaction, as well as the moisture threshold needed for the reaction. Furthermore, the influence of these exposure conditions on the internal damage caused by ASR-induced deterioration was discussed.

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Variations in the composition and relations between alkali-silica gels and calcium silicate hydrates in highway concrete

Cited by 15 publications

References 20 publications

The Thermo-Phase Change Reactivity of Textile and Cardboard Fibres in Varied Concrete Composites

The Thermo-Phase Change Reactivity of Textile and Cardboard Fibres in Varied Concrete Composites

Complementary analyses of concrete characteristics performed on cores taken from concrete pavements

Alkali–Silica Reactions: Literature Review on the Influence of Moisture and Temperature and the Knowledge Gap

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