Development of ultra-lightweight cement composites with low thermal conductivity and high specific strength for energy efficient buildings

Wu, Yi; Wang, Junyan; Monteiro, Paulo J.M.; Zhang, Min-Hong

doi:10.1016/j.conbuildmat.2015.04.004

Cited by 161 publications

(70 citation statements)

References 29 publications

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“…Xu et al found that even though incorporating cenosphere in magnesium oxy-chloride cement composite reduces the compressive strength, still high levels of strength (60 MPa) are achieved (Xu et al 2015). Similar findings for cenosphere particles in OPC based composites were presented by Wang et al (2012Wang et al ( , 2014 and Wu et al (2015). This indicates their potential for producing strong lightweight composites.…”

Section: Introductionsupporting

confidence: 67%

“…In the recent years, researchers have also been trying to investigate some other materials like cenosphere (Chávez-Valdez et al 2011;Kwan and Chen 2013;Pichór 2009;Wang et al 2012Wang et al , 2013Wu et al 2015;Xu et al 2015) and aerogel particles (Gao et al 2014;Hanif et al 2016;Kim et al 2013;Ng et al 2015) for their use as LWF. Xu et al found that even though incorporating cenosphere in magnesium oxy-chloride cement composite reduces the compressive strength, still high levels of strength (60 MPa) are achieved (Xu et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Different Lightweight Functional Fillers for Use in Cementitious Composites

Hanif

Cheng

et al. 2017

Int J Concr Struct Mater

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Abstract:The effects of different lightweight functional fillers on the properties of cement-based composites are investigated in this study. The fillers include fly ash cenospheres (FACs) and glass micro-spheres (GMS15 and GMS38) in various proportions. The developed composites were tested for compressive, flexural and tensile strengths at 10 and 28-day ages. The results indicated that both FACs and GMS38 are excellent candidates for producing strong lightweight composites. However, incorporation of GMS15 resulted in much lower specific strength values (only up to 13.64 kPa/kg m 3 ) due to its thinner shell thickness and lower isostatic crushing strength value (2.07 MPa). Microstructural analyses further revealed that GMS38 and GMS15 were better suited for thermal insulating applications. However, higher weight fraction of the fillers in composites leads to increased porosity which might be detrimental to their strength development.

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Section: Introductionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effects of Different Lightweight Functional Fillers for Use in Cementitious Composites

Hanif

Cheng

et al. 2017

Int J Concr Struct Mater

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“…Chabannes et al [6] utilized raw rice hush for lightweight concrete and demonstrated that the material can be used as a filling material to improve the mechanical performance of concrete. Wu et al [7] used hollow cenospheres from fly ash as lightweight aggregates for the material and confirmed its effect on the improvement of tensile strength. Colangelo et al [8] used a recycled municipal solid waste incinerator (MSWI) fly ash as lightweight aggregates and showed that the material can effectively be utilized as lightweight aggregates with average performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Gradings of Lightweight Aggregates on the Properties of Concrete

2017

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Lightweight aggregate concrete is a material with very low density and good thermal insulation, and several types of lightweight aggregates have been used for lightweight concrete. Since the characteristics of lightweight aggregates strongly affect the properties of lightweight concrete, a proper consideration for the use of lightweight aggregate is very important for development of lightweight materials. In particular, the sizes and spatial distributions of lightweight aggregates can influence the material responses of lightweight concrete, such as compressive strength and thermal conductivity. In this study, different types of gradings of lightweight aggregates are adopted to investigate the effect of gradings on the material properties. Liaver R , an expanded glass granulate, is used as a lightweight aggregate for the specimens. Virtual models of the lightweight specimens with different gradings are numerically generated, and both mechanical and thermal properties are evaluated using experimental and numerical approaches for more detailed investigation. The obtained results can be utilized to suggest an optimal grading that satisfies both the mechanical and thermal properties of lightweight concrete specimen.

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“…The thermal conductivities were obtained for all 90 mixes from ACI122R [15]. In addition, data for mixes 27 to 57 were reported in the relevant published articles [54,55] proposed ACI values were taken from Table 3.a of ACI122R-2014 and are based on practical thermal conductivity design values for normal weight (2240 to 2400 kg/m³), light and ultra-lightweight concrete (less than 1840 kg/m³). Figure 11 illustrates both theoretical and experimental thermal conductivity values for all 90 concrete mix designs.…”

Section: -3 Thermal Conductivity Of Concrete MIX Designmentioning

confidence: 99%

“…The concrete mix designs were collected from 8 published journal papers and databases [51][52][53][54][55][56][57][58][59]. These mix designs represent some conventional (normal weight) and some advanced methods of concrete admixture [52,54,56,57] that gives lightweight and ultra-lightweight concrete. Table 2 This study considers each individual concrete component in order to estimate the equivalent greenhouse emissions and thermal conductivity of the mixed design.…”

Section: -1 Materials and MIX Designsmentioning

confidence: 99%

Incorporating environmental evaluation and thermal properties of concrete mix designs

Robati

McCarthy

Kokogiannakis

2016

Construction and Building Materials

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One of the main challenges in sustainable design of buildings is to improve the energy efficiency of the building during its lifetime along with reducing the environmental impact of the design. Recent advances in concrete technology offer lower embodied emission through the application of supplementary cementitious materials and recycled aggregates. There are also improvements to thermal properties with the application of admixtures. However, the relationships between the environmental impact (Cradle to Gate) and thermal performance of concrete mix designs have not been researched adequately. The Green House Gas (GHG) emissions associated with each individual concrete component and its production need to be considered with greater refinement. This study correlates the impacts of selecting a concrete mix design in terms of CO 2 -e with resulting thermal conductivity and density at the design stage of buildings. This paper examines 90 concrete mix designs from published literature to identify their embodied emissions and thermal conductivity in order to discuss the relationship between low embodied carbon dioxide equivalents (CO 2 -e) emission alternatives and thermal conductivity. The embodied CO 2 -e of a variety concrete mix designs were quantified by compiling embodied CO 2 -e coefficient for each individual component in the concrete. The results show the variation in embodied CO2-e and thermal conductivity of concrete mixes. The application of readily available supplementary cementitious material can reduce embodied CO 2 -e (kg CO 2 -e) by up to 16% in comparison with general practice. Furthermore, the thermal conductivity of concrete mix is influenced by changing the density of aggregates and the proportion of cementitious materials. AbstractOne of the main challenges in sustainable design of buildings is to improve the energy efficiency of the building during its lifetime along with reducing the environmental impact of the design. Recent

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Development of ultra-lightweight cement composites with low thermal conductivity and high specific strength for energy efficient buildings

Cited by 161 publications

References 29 publications

Effects of Different Lightweight Functional Fillers for Use in Cementitious Composites

Effects of Different Lightweight Functional Fillers for Use in Cementitious Composites

Effect of Different Gradings of Lightweight Aggregates on the Properties of Concrete

Incorporating environmental evaluation and thermal properties of concrete mix designs

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