Mechanical and thermal properties of lightweight geopolymer composites

Colangelo, Francesco; Roviello, Giuseppina; Ricciotti, Laura; Ferrándiz-Mas, Verónica; Messina, Francesco; Ferone, Claudio; Tarallo, Oreste; Cioffi, Raffaele; Cheeseman, Christopher

doi:10.1016/j.cemconcomp.2017.11.016

Cited by 169 publications

(87 citation statements)

References 63 publications

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“…The highest UPV value achieved of 4.14 Km/s for Z 0.5 indicates the higher quality of the geopolymers. In fact, this resultshows that the nanoparticles led to changes in the materiel from a mesoporous structure (<3.5 Km/s) to a compact structure (>4 Km/s) [30], which was attributed to the enhancement of the density of the matrix as illustrated in the previous analysis. Furthermore, it can be noted that the reduction of the UPV value for the sample Z 0.7 as compared to the optimum values indicates the existence of defects and internal cracks in the concrete.…”

Section: Ultrasonic Pulse Velocity (Upv)supporting

confidence: 59%

Effect of nano-ZnO on mechanical and thermal properties of geopolymer

Zidi

Ltifi

Ayadi

et al. 2019

Journal of Asian Ceramic Societies

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In this experimental study, we synthesized geopolymer materials with different amounts of nano-ZnO (0.3%, 0.5% and 0.7%). The effects of the nano-ZnO concentration on the mechanical, structural and thermal properties were studied in detail. XRD investigation revealed the formation of a glassy phase in all the samples and a small shift of the intense peak, which confirmed the incorporation of nano-ZnO into the geopolymer matrix. FTIR analyses showed an increase in the geopolymerization after the addition of nano-ZnO to geopolymer paste. The morphology of the inorganic polymers was studied by mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). The addition of nano-ZnO improved the ultrasonic pulse velocity and increased the compressive strength from 30 to 38 MPa. It was found that the strength reached its maximum value at a critical nano-ZnO concentration of 0.5 at.%. The thermal properties of geopolymer nano-ZnO were also investigated using thermogravimetric analysis (TGA), which showed that the incorporation of nano-ZnO decreased weight loss by the geopolymers. The density and the absorption water were also tested and all the results were discussed. ARTICLE HISTORY * The title of this manuscript should define any chemical symbols or structures by the names, so I suggest that authors change the title to "Study the effect of nano zinc oxide on structural, thermal, and mechanical properties of geopolymerbased metakaolin". "Study the effect of nano-ZnO on structural, mechanical and thermal properties of geopolymer-based metakaolin" → Effect of nano-ZnO on mechanical and thermal properties of geopolymer Abstract * Please, authors, clarify and rephrase the concept of the sentences in lines 20 and 21.Furthermore, infrared specters showed an increase of geopolymer gel content with the addition of nano-ZnO → FTIR analyses showed an increase in the geopolymerization after the addition of nano-ZnO to the geopolymer paste. * The sentences in the lines 25 and 26 need rephrasing and English grammar check, please.

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Section: Ultrasonic Pulse Velocity (Upv)supporting

confidence: 59%

Effect of nano-ZnO on mechanical and thermal properties of geopolymer

Zidi

Ltifi

Ayadi

et al. 2019

Journal of Asian Ceramic Societies

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“…7. Comparison of (a) density versus TC and (b) compressive strength versus TC of lightweight concretes obtained in this study with those obtained by others [9,17,19,23,34,67,68] Microstructural analysis Figure 8 reveals the microstructure of fly ash geopolymer which shows smooth and compact matrix. The presence of remnant fly ash particles in conjunction with geopolymer matrix was typical for geopolymers.…”

Section: Thermal Conductivity (Tc)supporting

confidence: 60%

“…pumice [9]), recycled materials (e.g. crushed clay bricks [9], glass [15], packaging foam [16] and lightweight block [10]), expanded polystyrene [17] and expanded clay lightweight aggregates [18]. On the other hand, foam concretes with high void space with or without aggregates can be produced with the addition of foam agent (e.g.…”

mentioning

confidence: 99%

Compressive Strength and Thermal Conductivity of Fly Ash Geopolymer Concrete Incorporated with Lightweight Aggregate, Expanded Clay Aggregate and Foaming Agent

Yun-Ming¹,

Sandu²,

Cheng-Yong³

et al. 2019

Rev. Chim.

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This paper investigates the effect of incorporation of lightweight aggregate and foam in the preparation of lightweight aggregate geopolymer concrete (LWAGC) and lightweight aggregate foamed geopolymer concrete (LWAFGC). The geopolymer paste was formed by alkali activation of Class F fly ash in mixture of sodium silicate and sodium hydroxide solution. LWAGC was incorporated with expanded clay lightweight aggregate and river sand while hydrogen peroxide was added as foaming agent for LWAFGC. Results showed that LWAGC and LWAFGC achieved an excellent 28-day compressive strength of 60 MPa and 20 MPa, respectively. The bulk densities were 1815 kg/m3 for LWAGC and 1593 kg/m3 for LWAFGC. Even so, low thermal conductivity of 0.12 W/mK and 0.09 W/mK were reported. It was concluded that the joint effect of lightweight aggregate and foam produced geopolymer concrete with good mechanical strength while having excellent thermal insulating properties. The geopolymer concretes possessed high strength-to-density ratio to be regarded as lightweight high-performance structures.

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“…However, previous studies focused mainly on wall claddings, board, partitions, and other non-structural elements [11,[22][23][24][25][26]. Thermal conductivity, density, and compressive strength of EPS beads as reported in previous literatures are summarized in Table 1 [23,[27][28][29][30][31][32][33][34][35]. From Table 1, EPS beads improve the thermal insulation of concrete when serving as lightweight aggregates, but reduce its strength as the content increases.…”

Section: Introductionmentioning

confidence: 99%

Structural Applications of Thermal Insulation Alkali Activated Materials with Reduced Graphene Oxide

Long¹,

Lin²,

Tan³

et al. 2020

Materials

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Development of low thermal conductivity and high strength building materials is an emerging strategy to solve the heavy energy consumption of buildings. This study develops sustainable alkali activated materials (AAMs) for structural members from waste expanded polystyrene (EPS) beads and reduced graphene oxide (rGO) to simultaneously meet the thermal insulation and mechanical requirements of building energy conservation. It was found that the thermal conductivity of AAMs with 80 vol.% EPS and 0.04 wt.% rGO (E8–G4) decreased by 74% compared to the AAMs without EPS and rGO (E0). The 28-day compressive and flexural strengths of E8–G4 increased by 29.8% and 26.5% with the addition of 80 vol.% EPS and 0.04 wt.% rGO, compared to the sample with 80 vol.% EPS without rGO (E8). In terms of compressive strength, thermal conductivity, and cost, the efficiency index of E8–G4 was higher than those of other materials. A building model made from AAMs was designed using building information modeling (BIM) tools to simulate energy consumption, and 31.78% of total energy consumption (including heating and cooling) was saved in the building operation period in Harbin City, China. Hence, AAMs made of waste EPS beads and rGO can realize the structural and functional integrated application in the future.

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Mechanical and thermal properties of lightweight geopolymer composites

Cited by 169 publications

References 63 publications

Effect of nano-ZnO on mechanical and thermal properties of geopolymer

Effect of nano-ZnO on mechanical and thermal properties of geopolymer

Compressive Strength and Thermal Conductivity of Fly Ash Geopolymer Concrete Incorporated with Lightweight Aggregate, Expanded Clay Aggregate and Foaming Agent

Structural Applications of Thermal Insulation Alkali Activated Materials with Reduced Graphene Oxide

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