Temperature Effect on the Thermal Conductivity of Expanded Polystyrene Foamed Concrete: Experimental Investigation and Model Correction

Shi, Jinyan; Liu, Yuanchun; Liu, Baoju; Han, Di

doi:10.1155/2019/8292379

Cited by 23 publications

(8 citation statements)

References 28 publications

(29 reference statements)

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“…There are many methods used to measure the thermal conductivity of cement composites [ 37 ]. However, we chose a simple method involving the use of a machine: Isomet-2114 (Applied Precision, Bratislava, Slovakia) [ 38 , 39 , 40 ]. Isomet-2114 is widely used to measure the thermal conductivity of the concrete specimens and the results are accurate.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

et al. 2021

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To solve the problem of black ice, many studies are being carried out. The key in recent days is enhancing the thermal conductivity of concrete. In this study, to improve the thermal conductivity, silicon carbide was used to substitute 50% and 100% of the fine aggregate. In addition, steel fiber is not only for enhancing the mechanical properties but could enhance thermal conductive material. Hence, the arched-type steel fiber was used up to a 1% volume fraction in this study. Furthermore, graphite was used for 5% of the volume fraction for enhancing the thermal conductivity. However, thermal damage would occur due to the difference in thermal conductivity between materials. Therefore, the thermal durability must be verified first. The target application of the concrete in this study was its use as road paving material. To evaluate the thermal durability, freeze–thaw and rapid cyclic thermal attacks were performed. The thermal conductivity of the specimens was increased with the increase in thermal conductive materials. Graphite has already been reported to have a negative effect on mechanical properties, and the results showed that this was the case. However, the steel fiber compensated for the negative effect of graphite, and the silicon carbide provided a filler effect. Graphite also had a negative effect on the freeze–thaw and rapid cyclic thermal attack, but the steel fiber compensated for the reduction in thermal durability. The silicon carbide also helped to improve the thermal durability in the same way as steel fiber. Comprehensively, the steel fiber enhanced all of the properties of the tests. Using 100% silicon carbide was considered the acceptable range, but 50% of silicon carbide was the best. Graphite decreased all the properties except for the thermal conductivity. Therefore, the content of graphite or using other conductive materials used should be carefully considered in further studies.

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Section: Materials and Experimentsmentioning

confidence: 99%

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

et al. 2021

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“…Using of plastic in concrete is not a new topic for the science, but the usage of which type of plastic under suitable conditions in concrete holds the difference. In concrete the failure of the structure will be initiated with the failure of the aggregate (7) . The natural failure pattern of concrete is brittle in nature and also it has the tendency to carry the entire compressive load which is similar for the coarse aggregate (8) .…”

Section: Introductionmentioning

confidence: 99%

Effect of Polystyrene Waste on Concrete at Elevated Temperature

Rajaram¹,

Kandasamy²,

Ravichandran³

et al. 2022

IJST

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Objectives:The purpose of the present study is to examine the thermal and impact behaviour of the concrete containing polystyrene waste as aggregates. Methods: The concrete specimens were cast and cured in a conventional way to examine the mechanical behaviour of the concrete. A separate equipment was prepared to determine the impact strength of the concrete as per ASTM D5420-21. The thermal behaviour of the concrete with plastic aggregates were also examined with reference to IS 7861-1 (1975). Artificial Neural Network was also used to predict and compare the properties between both the conventional and plastic concrete. Findings: The mechanical behaviour of the concrete behaves well at Mix 2 when compared to other mixes. The impact strength of the concrete was found to be 98.375 J at Mix3 which was 20.69% higher than the Mix2. At Mix2 the 7 days compression strength in elevated temperature is 16.79 N/mm 2 which was 4.8% higher than the Mix 1 and 31.74% higher than the Mix 3. At 28 days, the compressive strength of concrete containing 50% replacement of aggregate exposed to temperature 50 o c for 24 hours is 26.84 N/mm 2 which shows a better result and resistance in the thermal condition than the other mixes. ANN also gives reliable predicted values which exhibits a clear relation with the inclusion of the plastic aggregate and concrete matrix with some minimum errors. Novelty: From the experimental investigation it was observed that the plastic concrete fails in the transition zone of concrete due to the weaker bonding between the plastic aggregate and cement matrix. The plastic aggregate has not undergone any crushing failure in the concrete specimens when compared to the conventional aggregate. Thus, this solid polystyrene waste can be used as an alternative material for coarse aggregate in concrete.

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“…With the ability to adjust the densities of cement-based foam concretes (density of 400-1850 kg/m 3 [7]), it may be employed mainly in structural partition walls and places where high thermal insulation values are required [8]. In addition, foam concrete has superior strength and fire resistance when compared to organic insulation materials [7,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Thermal Characterization of Foam Concrete Panels Containing Expanded Perlite-Polystyrene, Foam and Aerogel Layer

Durmuş

TOPUZ

2022

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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For our country, which has few renewable energy supplies, energy sustainability is becoming increasingly vital. Foam concrete is a porous building material having air spaces created by foaming agents, as well as a high energy efficiency due to its pores. The goal of this research is to produce high-insulating building materials by using expanded perlite and granular polystyrene foam as aggregates and an aerogel layer on the concrete surface in foam concrete. Thermal conductivity, physical and mechanical properties of samples produced using various cement types and aggregate ratios were analyzed. Thermal conductivity values and mechanical properties were found to be better in foam concrete samples made with Portland composite cement. The use of Portland composite cement resulted in the lowest thermal conductivity coefficient of (λ) 0.09848 W/m.K. The use of less expanded perlite in foam concrete, likewise polystyrene foam, increased the thermal conductivity coefficient. It has been discovered that using silica aerogel as a layer has no major effect on the change in the thermal conductivity coefficient, and more extensive studies should be conducted on its use in foam concrete.

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Temperature Effect on the Thermal Conductivity of Expanded Polystyrene Foamed Concrete: Experimental Investigation and Model Correction

Cited by 23 publications

References 28 publications

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

Effect of Polystyrene Waste on Concrete at Elevated Temperature

Thermal Characterization of Foam Concrete Panels Containing Expanded Perlite-Polystyrene, Foam and Aerogel Layer

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