Shrinkage deformation of cement foam concrete

Kudyakov, A. I.; Steshenko, A. B.

doi:10.1088/1757-899x/71/1/012019

Cited by 20 publications

(7 citation statements)

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“…The increments of 84.7% and 558% in tensile strength for the addition of 3.3% of polyvinyl alcohol fibers compared to plain FC for the density of 1000 kg/m 3 [ 201 ] and fibres altered FC material stress-strain behaviour. With the studied range of 0.25 to 0.5% of polypropylene and 1400 kg/m 3 FC density, it was found that optimum performance can be found from 0.5% where flexural strength was 58% higher than plain FC [ 21 ].…”

Section: Properties Of Frfcmentioning

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: Properties Of Frfcmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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“…Some effective methods such as incorporating high elastic modulus polymer fibers are proposed to delay the development of cracks in foam concrete and improve its deformation resistance. Kudyakov et al [ 26 , 27 ] found that a small number of asbestos fibers can reduce the drying shrinkage of foam concrete by more than 40%. Khan [ 28 ] studied the effect of polypropylene fibers on the splitting tensile strength and Poisson’s ratio of foam concrete and concluded that polypropylene fibers can substantially increase the tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Research on the Improving Performance of Foam Concrete Applied to the Filling of Natural Gas Pipeline Cross-River Tunnel

Chen

et al. 2022

Materials

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The shield tunnel is a common solution for natural gas pipelines crossing rivers. Consequently, the development of natural gas tunnel filling materials with excellent performance is crucial to the safe operation and maintenance of pipelines. The foam concrete offers a reasonable solution. Nevertheless, since its inherent compressive strength decreases almost proportionally with the decrease in density, obstacles remain concerning obtaining the high density and relatively low strength required for natural gas tunnel filling. Here, a synergistic optimization strategy was proposed involving the orthogonal test, univariate control, and comprehensive balance method. It involves modifying the type and proportion of cementitious matrix, in particular by incorporating fly ash and PVA fibers in the mix design, and synergetic determining the best mix ratio from the aspects of compressive strength, stability, and dry density. The obtained foam concrete has a compressive strength of 4.29 MPa (FC4) and a dry density of 1060.59 kg/m3 (A11), which meets the requirements of pipeline pressure and pipeline anti-floating. This study is applied to the Yangtze River shield crossing project of the Sino-Russian Eastern Gas Pipeline, and ANSYS was used to simulate the stress and deformation of the foam concrete. This work provides an efficient foam concrete optimization mix scheme, and supports the application of foam concrete in the filling of the long-distance cross-river natural gas tunnels.

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“…Foam concrete has been used as a filling material for crash barriers due to its good energy-absorbing performance. However, its significant disadvantages, including low strength, poor toughness, and easy cracking, may affect the structural performances and safety of crash barriers (Kearsley and Wainwright, 2001;Etkin et al, 2010;Kudyakov and Steshenko, 2015). Lots of existing studies have confirmed that incorporating fibers into foam concrete can benefit the improvement of strength, toughness, crack resistance, and energy absorption performance (Zhang et al, 2011;Ma et al, 2012;Shen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Performance of Foam Concrete With Recycled Coir Fiber

Zhang

et al. 2020

Front. Mater.

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Foam concrete, a new kind of building material, has attracted wide attention due to its high energy absorption capability and low density. However, the low strength and poor toughness of foam concrete have become obstacles to hinder its further application. Coir fiber (CF), as a renewable recycled plant fiber, has shown a significant effectiveness for improving the mechanical properties of cement-based materials in some previous studies. In this paper, CF was introduced into foam concrete to develop its dynamic performance. A total of 54 foam concrete specimens with different CF contents (0.0%, 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%) were prepared and divided into six groups. A single-impact test was carried out at three driving gas pressures (0.20, 0.25, and 0.30 MPa) by means of Split Hopkinson pressure bar experimental technology to investigate the effect of CF content on the dynamic performance of foam concrete, including the failure mode, dynamic compressive strength, stress-strain behavior, and energy absorption capacity. Furthermore, to explain the change mechanism of CF-foam concrete, a microstructure analysis was conducted through a scanning electron microscope and X-ray diffraction. The results revealed that an appropriate amount of CF could significantly improve the dynamic performance of foam concrete. The foam concrete's ductility attained an optimal level at the CF content of 1.5%. The dynamic compressive strengths reached their highest values of 2.27 MPa (at 0.20 MPa gas pressure), 3.18 MPa (at 0.25 MPa gas pressure), and 4.21 MPa (at 0.30 MPa gas pressure) at the CF content of 1.5%. The peak values of energy absorption were 8.9 J (at 0.20 MPa gas pressure) at a CF content of 2.0%, 14.9 J (at 0.25 MPa gas pressure) at a CF content of 1.5%, and 22.4 J (at 0.30 MPa gas pressure) at a CF content of 1.5%, respectively. However, this improvement would deteriorate when CF was in excess.

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Shrinkage deformation of cement foam concrete

Cited by 20 publications

References 0 publications

Fibre-Reinforced Foamed Concretes: A Review

Fibre-Reinforced Foamed Concretes: A Review

Research on the Improving Performance of Foam Concrete Applied to the Filling of Natural Gas Pipeline Cross-River Tunnel

Dynamic Performance of Foam Concrete With Recycled Coir Fiber

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