Mechanical properties and microstructure of basalt fibre and nano-silica reinforced recycled concrete after exposure to elevated temperatures

Wang, Yonggui; Shuaipeng, Li; Hughes, P. C.; Fan, Yongzhe

doi:10.1016/j.conbuildmat.2020.118561

Cited by 114 publications

(37 citation statements)

References 58 publications

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“…Previous researchers [36] showed that increasing the size of the cube specimen from 100 to 150 mm had no significant effect on the residual compressive strength after exposure to temperatures up to 1200 • C, while others [37] drew a similar conclusion for concrete cylinders having different sizes (diameter × length) of 50 × 100 mm, 100 × 200 mm and 150 × 300 mm. The cylinders were exposed to temperatures up to 800 • C. Several previous studies [38][39][40][41][42][43][44][45][46] adopted 100 mm cubes to evaluate the residual compressive strength of concrete. Seven concrete patches were cast and cured in water tanks under the same conditions for 28 days, after which the specimens were left to air dry for a few hours and then dried in an electrical oven at 100 • C for 24 hours [15,[47][48][49][50].…”

Section: Experimental Workmentioning

confidence: 99%

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

et al. 2021

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Portland cement concrete is known to have good fire resistance; however, its strength would be degraded after exposure to the temperatures of fire. Repeated low-velocity impacts are a type of probable accidental load in many types of structures. Although there is a rich body of literature on the residual mechanical properties of concrete after high temperature exposure, the residual repeated impact performance of concrete has still not been well explored. For this purpose, an experimental study was conducted in this work to evaluate the effect of high temperatures on the repeated impact strength of normal strength concrete. Seven identical concrete patches with six disc specimens each were cast and tested using the ACI 544-2R repeated impact setup at ambient temperature and after exposure to 100, 200, 300, 400, 500 and 500 °C. Similarly, six cubes and six prisms from each patch were used to evaluate the residual compressive and flexural strengths at the same conditions. Additionally, the scattering of the impact strength results was examined using three methods of the Weibull distribution, and the results are presented in terms of reliability. The test results show that the cracking and failure impact numbers of specimens heated to 100 °C reduced slightly by only 2.4 and 3.5%, respectively, while heating to higher temperatures deteriorated the impact resistance much faster than the compressive and flexural strengths. The percentage reduction in impact resistance at 600 °C was generally higher than 96%. It was also found that the deduction trend of the impact strength with temperature is more related to that of the flexural strength than the compressive strength. The test results also show that, within the limits of the adopted concrete type and conducted tests, the strength reduction after high temperature exposure is related to the percentage weight loss.

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Section: Experimental Workmentioning

confidence: 99%

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

et al. 2021

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“…The motivation behind the use of the above-mentioned additions in these experiments was the fact that the addition of micro-silica with an adequate amount of plasticiser has already been proven to provide higher values of stresses in pull-out tests due to the stronger bond between various types of fibres and cementitious matrices with micro-silica addition [ 56 , 57 ]. Additionally, the applicational potential of nanosilica in cement composites has been underlined in article [ 58 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behaviour of Cementitious Mortars with the Addition of Basalt Fibres

et al. 2021

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The results of flexural tests of basalt fibre-reinforced cementitious mortars in terms of flexural strength and the occurrence of the bridging effect are summarised. Mixture proportions and curing conditions were altered for various series. The main parameters concerning mixture proportions were water to cement ratio (w/c), micro-silica and plasticiser addition and fibre dosage (1%, 3% and 6.2% by binder’s mass). Various curing conditions were defined by different temperatures, humidity and time. The influence of the amount of water inside the pores of the hardened cementitious matrix on the flexural strength values, as far as the impact of the alkaline environment on basalt fibres’ performance is concerned, was underlined. The designation of flexural strength and the analysis of post-critical deformations were also performed on the reference series without fibres and with the addition of more common polypropylene fibres. The bridging effect was observed only for the basalt fibre-reinforced mortar specimens with a relatively low amount of cement and high w/c ratio, especially after a short time of hardening. For the lowest value of w/c ratio (equalling 0.5), the bridging effect did not occur, but flexural strength was higher than in the case of non-reinforced specimens. Comparing mortars with the addition of basalt and polypropylene fibres, the former demonstrated higher values of flexural strength (assuming the same percentage dosage by the mass of the binder). Nevertheless, the bridging effect in that case was obtained only for polypropylene fibres.

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“…Yonggui et al [31] examined the efficiency of reinforced recycled concrete using basalt fiber and Ns at elevated temperatures of 25°C, 200°C, 400°C, and 600°C for a fire period of 6 hours. At various temperatures, Ns improved the compressive strength.…”

Section: Literature Reviewmentioning

confidence: 99%

Behavior of concrete using alccofine and nano-silica under elevated temperature

Ashwini¹,

Rao²

2021

IJATEE

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Infrastructural development is multiplying worldwide, which has raised the demand for raw materials used in producing concrete [1]. Fine aggregates, coarse aggregates, and cement are used to make concrete. Cement acts as the glue that binds concrete together, but cement manufacturing causes significant environmental impact [2]. Extensive research is being done to create concrete to minimize this effect by finding an alternative to cement [2]. Supplementary cementitious materials (SCM) used entirely or partially as a substitute enhances concrete efficiency. Still, their reactivity is affected by factors such as chemical composition, surface area, shape, and size of the SCM, percentage replacement, and cement type [3]. Unique properties like high strength, compact morphology, reduced permeability, and enhanced durability are achieved using SCM to produce highperformance concrete [4].

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Mechanical properties and microstructure of basalt fibre and nano-silica reinforced recycled concrete after exposure to elevated temperatures

Cited by 114 publications

References 58 publications

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

Flexural Behaviour of Cementitious Mortars with the Addition of Basalt Fibres

Behavior of concrete using alccofine and nano-silica under elevated temperature

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