Effect of polyethylene powder and heating treatment on the microstructure and hardened properties of foam concrete

Dang, Juntao; Zhao, Shunbo; Chen, Gonglian; Cao, Xing-xing; Yang, Jinlong

doi:10.1016/j.jobe.2022.104143

Cited by 13 publications

(9 citation statements)

References 36 publications

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“…Furthermore, PP fiber can occupy the volume of cement paste, thus resulting in porous microstructure and more pores (as observed in the SEM section) that contribute to the reduction of fresh UW and dry density. This result is in agreement with the findings found in the previous studies of foam concrete with the inclusion of PP fiber or polyethylene powder (Dang et al, 2022;Ibrahim et al, 2014).…”

Section: Fresh Uw and Dry Densitysupporting

confidence: 93%

“…Previous studies of the foam concrete without PP fiber inclusion indicated that water absorption of foam concrete was mostly affected by the paste phase, thus reducing the paste volume phase (i.e., lower density) caused the reduction of water absorption in this case. In contrast, the result of this study was in agreement with the results obtained in previous studies of foam concrete with fiber or polyethylene powder inclusion (Dang et al, 2022;Raj et al, 2020). The increase in water absorption can be attributed to more voids (pores) with more inclusion of PP fiber, which can be observed in Figure 6 (in the SEM observation section).…”

Section: Water Absorptionsupporting

confidence: 92%

“…Then, the drying process led to the evaporation of water, which provided the main pore, consequently leading to a higher water absorption level. Furthermore, the inclusion of PP fiber may also damage the cell wall of foam in the fresh mixture, generating more microvoid in foam concrete, which causes a higher water absorption (Dang et al, 2022).…”

Section: Water Absorptionmentioning

confidence: 99%

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Characteristics of lightweight foamed concrete with various contents of polypropylene fiber

Ngo¹,

Ho²,

Huynh³

2022

CTUJS

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This study investigates the influence of polypropylene (PP) fiber content on the mechanical properties of lightweight foamed concrete (LFC). Four LFC mixtures with a target dry density of 1000 kg/m3 were designed with different PP fiber volumes of 0%, 0.25%, 0.5%, and 0.8%. The fresh unit weight (UW), dry density, compressive and flexural strengths, water absorption, thermal conductivity, ultrasonic pulse velocity (UPV), and scanning electron microscopy (SEM) of the LFC were examined. The results indicate that the fresh UW, dry density, UPV, and thermal conductivity decreased when the PP content varied from 0% to 0.8%. At 28 days, the compressive and flexural strengths of the LFC increased approximately 11.85% and 41.8% when the PP fiber amount varied from 0% to 0.8%, respectively. The result implies that the PP fiber content had a higher influence on the flexural strength content than the compressive strength. Furthermore, the results of SEM could explain well the obtained mechanical properties. The findings of this study indicate that PP fiber could be used up to 0.8% by volume to reduce the self-weight of the LFC and enhance the mechanical strength as well as thermal isolation characteristics of the LFC.

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Section: Fresh Uw and Dry Densitysupporting

confidence: 93%

Section: Water Absorptionsupporting

confidence: 92%

Section: Water Absorptionmentioning

confidence: 99%

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Characteristics of lightweight foamed concrete with various contents of polypropylene fiber

Ngo¹,

Ho²,

Huynh³

2022

CTUJS

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“…Microsilica acts as a filler, it provides a denser packing of particles, and also promotes the additional formation of calcium silicate hydrate (CSH) [ 36 , 49 , 50 , 51 ]. Thus, a larger amount of CSH contributes to a denser packing of particles of inert components in the material of the interpore wall as well as faster curing of foam concrete and, accordingly, higher values of compressive strength [ 30 , 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

Insulation Foam Concrete Nanomodified with Microsilica and Reinforced with Polypropylene Fiber for the Improvement of Characteristics

et al. 2022

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Some of the primary problems of construction are brittleness and low the mechanical properties of good thermal insulation materials. Heat-insulating foam concrete has a low thermal conductivity. However, it is practically impossible to transport it over long distances since corners are cracked during transportation, the structure is broken, and, in principle, the fragility of this material is a big problem for modern buildings. The purpose of this study was to develop a heat-insulating foam concrete with improved characteristics by experimentally selecting the optimal dosage of polypropylene fiber and a nanomodifying microsilica additive. Standard methods for determining the characteristics of fiber foam concrete were used as well as the method of optical microscopy to study the structure of the composite. It has been established that the use of polypropylene fiber with the optimal reinforcement range from 1% to 3% allows us to achieve an improvement in the mechanical and physical characteristics of fiber foam concrete. The optimal dosage of the nanomodifier introduced instead of a part of the binder (10%) and polypropylene fiber (2%) by weight of the binder was determined. The maximum values of increments in mechanical characteristics were 44% for compressive strength and 73% for tensile strength in bending. The values of the thermal conductivity coefficient at optimal dosages of the nanomodifier and fiber decreased by 9%. The absence of microcracking at the phase boundary between the polypropylene fiber and the hardened cement–sand matrix due to nanomodification was noted.

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“…Polyethylene (PE) foams are lightweight materials with many attractive properties such as low density, impact damping, thermal insulation, and low dielectric constant. [1][2][3][4] Hence, PE foams have a wide range of applications in various fields including construction materials, thermal and/or sound insulators, packaging, automotive components, healthcare and sports equipment, etc. [5][6][7] Cross-linking is one of the important parameters that can affect the foaming behavior of PE resins.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of the thermal stability and mechanical properties of low-density polyethylene/high-density polyethylene foam using a modified calcium sulfate whisker

Xu,

Zhong,

et al. 2023

New J. Chem.

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Effect of polyethylene powder and heating treatment on the microstructure and hardened properties of foam concrete

Cited by 13 publications

References 36 publications

Characteristics of lightweight foamed concrete with various contents of polypropylene fiber

Characteristics of lightweight foamed concrete with various contents of polypropylene fiber

Insulation Foam Concrete Nanomodified with Microsilica and Reinforced with Polypropylene Fiber for the Improvement of Characteristics

Reinforcement of the thermal stability and mechanical properties of low-density polyethylene/high-density polyethylene foam using a modified calcium sulfate whisker

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