Flexural performance of glazed hollow bead reinforced concrete beams

Zhang, Yu; Ma, Gang; Liu, Yuanzhen; Li, Zhu

doi:10.1177/0731684415596595

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…GHBC has remarkable advantages in heat preservation and fire resistance [8]. In addition, the research also shows that GHBC has an obvious improvement in flexural and shear strength of reinforced concrete [9]. Compared with normal sand, glazed hollow bead lightweight fine aggregate has an obvious difference in shape, density, and surface morphology.…”

Section: Introductionmentioning

confidence: 88%

Carbonation Resistance Performance and Micro-Structure Analysis of Glazed Hollow Bead Insulation Concrete

2019

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In this paper, the carbonation depths of glazed hollow bead insulation concrete (GHBC) and normal concrete (NC) at different carbonation ages are tested. The microstructure of GHBC and NC before and after carbonation were observed and compared by mercury intrusion porosimetry (MIP), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The results showed that NC had better carbonation resistance than GHBC, and GHBC had a carbonation depth of 1.61 times than that of NC at 28 days accelerated carbonation experiment. The microstructural analysis showed that with the decrease of porosity of the samples, the carbon content and CaCO3 content increased after carbonation. The porosity of NC decreased from 14.36% to 13.53%, the carbon content increased from 4.42% to 5.94%, and the CaCO3 content increased from 18.5% to 56.0%. The porosity of GHBC decreased from 22.94% to 20.71%, the carbon content increased from 4.97% to 5.31%, and the CaCO3 content increased from 70.0% to 82.0%. The above results showed that carbon reacts with hydration products 3CaO·SiO2, 2CaO·SiO2, and Ca(OH)2 to produce a large amount of CaCO3 which causes a large amount of pores to be filled and refined hence the porosity and pore size were reduced leading to increase in the compactness of the material. From the results obtained, the carbonation depth prediction formula of glazed hollow bead insulation concrete was developed, and carbonation life was predicted.

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Section: Introductionmentioning

confidence: 88%

Carbonation Resistance Performance and Micro-Structure Analysis of Glazed Hollow Bead Insulation Concrete

2019

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“…Additionally, the lightweight properties of glass and polystyrene beads make them float and separate during mixing and vibration, which can adversely affect the processing and mechanical properties of concrete [17,18]. ird, a plant fiber is added to concrete to form a composite reinforcement material to improve the concrete strength [19]. e inherent multiscale cell wall of plant fiber and the inner cavity structure can also reduce the thermal conductivity of concrete [20].…”

Section: Introductionmentioning

confidence: 99%

“…e low thermal conductivity [19] of plant fiber and its good compatibility with the concrete matrix [21,22] can further reduce the thermal conductivity of the shotcrete. Plant fibers are generally used as a silt soil reinforcement material [23].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties and Thermal Conductivity of Cotton Stalk Fiber Heat-Insulating Shotcrete

Liu

Yao

Pang

2022

Advances in Materials Science and Engineering

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In this study, heat-insulating shotcrete with excellent performance was developed to effectively reduce the thermal conductivity and meet the strength requirements of shotcrete in high ground temperature roadways. Ceramsite and pottery sand were used to replace 5% and 10% of sand and stone, respectively. The shotcrete was composed of cotton rod fiber treated with polyvinyl alcohol solution (SH adhesive) and other materials in a certain mix ratio. The working, mechanical, and heat insulation properties of the shotcrete were investigated by compressive strength, splitting tensile, thermal conductivity, electron microscope scanning, and X-ray diffraction tests. The results showed that the optimum content of the cotton stalk fiber was 2 kg/m3. The compressive strength and the splitting tensile properties were excellent, and the strength attained the maximum value. The performance of shotcrete increased with an increase in the cotton stalk fiber content. The thermal conductivity curve decreased smoothly when the cotton stalk fiber content exceeded 2 kg/m3. Furthermore, when the cotton stalk fiber content was 0–2 kg/m3, the internal cotton stalk fiber was tightly wrapped by the hydrate, and the mechanical properties were enhanced. Moreover, when the cotton stalk fiber content was 2-3 kg/m3, a clustering phenomenon occurred, and the compressive and tensile strengths were reduced. The hydration reaction of the cement mixed with cotton stalk fiber was normal, and the reinforced reticulated porous structure was formed with ceramsite in the concrete matrix, improving the strength of the concrete and reducing the thermal conductivity.

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“…However, the strength and stiffness of the concrete decrease exponentially with the increase in the number and sizes of pores. e second method is to partially substitute the coarse and fine aggregates in concrete with various additives, such as ceramsite, pottery sand, glazed hollow beads, expandable polystyrene beads, and other lightweight porous materials, thereby reducing the thermal conductivity of the concrete [16][17][18]. However, ceramsite and pottery sand can lead to large water absorption.…”

Section: Introductionmentioning

confidence: 99%

“…After mixing the aggregate, the brittleness of concrete increases, resulting in poor workability and difficulty in molding the material [16]. Furthermore, the surface hydrophobicities of glazed hollow beads and polystyrene beads cause them to float and separate during the processes of mixing, vibrating, and separating, which affects the processability and mechanical properties of the concrete [17,18]. In the third method, plant fiber is mixed in the concrete to form a composite reinforced material, which can improve the strength of the concrete [19].…”

Section: Introductionmentioning

confidence: 99%

A New Heat Insulation Shotcrete Mixed with Basalt and Plant Fibers

Huang

Pang

Liu

et al. 2019

Advances in Civil Engineering

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An orthogonal set of experiments was performed on common shotcrete, where the coarse and fine aggregates were substituted with ceramsite and pottery sand, while basalt and plant fibers were also added. The influence of ceramsite, pottery sand, basalt fiber, and plant fiber on the mechanical properties and thermal conductivity of shotcrete was investigated, and the relevant mechanisms were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the admixtures formed a stable state in the concrete matrix when the coarse and fine aggregates were substituted by 5 mass% of ceramsite and 10 mass% of pottery sand, respectively, and with 0.15 and 0.2 vol.% basalt fiber and plant fiber, respectively. At this point, the cement hydration was normal, and the strength of the concrete was relatively higher than other groups. The ceramsite and pottery sand formed a uniformly distributed porous structure in the concrete matrix, thereby reducing the thermal conductivity of the concrete.

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Flexural performance of glazed hollow bead reinforced concrete beams

Cited by 6 publications

References 12 publications

Carbonation Resistance Performance and Micro-Structure Analysis of Glazed Hollow Bead Insulation Concrete

Carbonation Resistance Performance and Micro-Structure Analysis of Glazed Hollow Bead Insulation Concrete

Study on the Mechanical Properties and Thermal Conductivity of Cotton Stalk Fiber Heat-Insulating Shotcrete

A New Heat Insulation Shotcrete Mixed with Basalt and Plant Fibers

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