Improving the early strength of concrete: Effect of mechanochemical activation of the cementitious suspension and using of various superplasticizers

Ibragimov, Ruslan; Федюк, Роман

doi:10.1016/j.conbuildmat.2019.07.313

Cited by 57 publications

(21 citation statements)

References 30 publications

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“…Due to the foam bubbles’ thixotropic behavior, the slurry can be easily poured or pumped into the desired shapes or structural elements [ 47 ]. Depending on the ambient temperature and humidity, the slurry requires up to 24 h to solidify [ 76 , 77 ]. The solidification time could be reduced to 2 h with the help of steam curing at temperature up to 70 °C.…”

Section: Foam Concrete: a Prefacementioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

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Section: Foam Concrete: a Prefacementioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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“…Several research groups examined the strengthening effect of TRC on the flexural performance of reinforced concrete (RC), considering mostly the fiber type, number of textile plies, and matrix strength as parameters [ 3 , 4 , 5 , 6 , 7 ]. Recently, the effect of mechanochemical activation of the cementitious suspension and the use of various superplasticizers has been studied for binders [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Concrete Element with Precast Textile Reinforced Concrete Panel and Grouting Material

et al. 2020

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Textile reinforced concrete (TRC) has widely been used for strengthening work for deteriorated reinforced concrete (RC) structures. The structural strengthening often requires accelerated construction with the aid of precast or prefabricated elements. This study presents an innovative method to strengthen an RC slab-type element in flexure using a precast panel made of carbon TRC. A total of five RC slabs were fabricated to examine the flexural strengthening effect. Two of them were strengthened with the precast panel and grouting material and another set of two slabs was additionally strengthened by tensile steel reinforcement. The full-scale slab specimens were tested by a three-point bending test and the test results were compared with the theoretical solutions. The results revealed that the ultimate load of the specimens strengthened with the TRC panel increased by at least 1.5 times compared to that of the unstrengthened specimen. The application of the precast TRC panel and grouting material for the strengthening of a prototype RC structure verified its outstanding constructability.

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“…Very often taking a cement composite sample for testing from an existing structure is limited or even impossible. Destructive testing in concrete technology allows for precise determination of physical and mechanical properties of the material [ 1 , 2 ]. However, it requires the use of heavy equipment, which by nature is laboratory equipment, e.g., strength machines.…”

Section: Introductionmentioning

confidence: 99%

Application of an Automated Digital Image-Processing Method for Quantitative Assessment of Cracking Patterns in a Lime Cement Matrix

Szeląg

2020

Sensors

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The paper presents an original approach to the localization and analysis of the cracking patterns of cement composites. The lime cement matrix modified with microsilica was evaluated under a two-phase thermal load. For quantitative detection and analysis of thermal cracks, an image-processing method was applied. For this purpose, an original image double-segmentation method was developed using machine-learning algorithms. Among other things, the fractal analysis was used to describe the morphology and the thermal evolution of the cracking patterns. The basic mechanical characteristics were examined and the results indicated a very high correlation between tensile strength and all cracking patterns’ parameters. This allows high-quality estimation of the mechanical properties of the lime cement matrix to be carried out on the basis of measurement and evaluation of morphology of the thermal cracking patterns. Knowledge in this field contributes to the development of non-destructive testing methods in cement composites technology, in terms of localization of and tracking the cracking patterns.

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Improving the early strength of concrete: Effect of mechanochemical activation of the cementitious suspension and using of various superplasticizers

Cited by 57 publications

References 30 publications

Fibre-Reinforced Foamed Concretes: A Review

Fibre-Reinforced Foamed Concretes: A Review

Strengthening of Concrete Element with Precast Textile Reinforced Concrete Panel and Grouting Material

Application of an Automated Digital Image-Processing Method for Quantitative Assessment of Cracking Patterns in a Lime Cement Matrix

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