Comparison of the Thermal Characteristics of Portland Cement and Geopolymer Cement Concrete Mixes

Snell, Clarke; Tempest, Brett; Gentry, T. Russel

doi:10.1061/(asce)ae.1943-5568.0000240

Cited by 30 publications

(7 citation statements)

References 15 publications

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“…For the reference panel (PC), the absorptance, apparent density and thermal conductivity were, 0.816, 2.20 g/cm³ and 0.100 x W/(m.K), respectively. These results agree with those found in the literature, in which thermal conductivity is lower in AAM then in PC [12][13][14]. Through computer simulation it could be noticed that the 100 MK wall panel had the best performance for Belo Horizonte, presenting 86% thermal comfort hours, against 82% presented by the PC panel and 72% by the 80/20% MK/BFS.…”

Section: Resultssupporting

confidence: 90%

“…It is the case of the Brazilian thermal performance of residential buildings regulation NBR 15220/2005 and also on ISO 10456/2007, both of which present different materials and their properties for designers [10,11]; AAM are not part of the list of materials available for designers. Yet, studies show that AAM may have lower specific heat and thermal conductivity values than PC, which may enhance the material thermal performance in some climate conditions, since the thermal diffusivity is directly proportional to the thermal conductivity [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Portland versus alkali-activated cement wall panels containing mine tailing as aggregate: one-story house thermal performance simulation in a Brazilian and Portuguese hot and humid climate

et al. 2019

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Alkali-activated materials (AAM) compared to Portland cement (PC) may significantly reduce the carbon dioxide emissions, as well as the consumption of non-renewable natural resources in civil engineering applications. Further environmental advantages are possible if natural aggregates used for mortars and concretes are replaced with residues and wastes from industrial or mining activities. This paper compares the performance of PC with AAM as binders in cementitious wall panels for external cladding in hot and humid climate. Three different cementitious matrices are proposed, consisting of either 100% Portland cement (PC), 100% alkali-activated metakaolin (MK) or 80/20 alkali-activated Metakaolin/Blastfurnace slag (80/20 MK/BFS). Mortars were produced with the addition of tailing from iron-ore mining activities in the state of Minas Gerais, Brazil, at an aggregate to binder ratio of 1.0 for all matrices. The thermal property determined for the three mortars was Thermal Conductivity using a heat flow meter (HFM) apparatus according to ISO 8301 (1999); their apparent density was also measured. After that, one-story house building simulation was carried out using the Energy Plus Software. The main room annual operative temperature provided by different panels used as cladding was compared to the adaptive comfort range established on ASHRAE Standard 55/2013 for a Brazilian and Portuguese hot and humid climate. According to the Climate Zone Definitions of ANSI/ASHRAE Standard 169/2006, Belo Horizonte (Brazil) and Funchal (Portugal) were selected as a sample of 2A zone that presents a hot and humid climate. Partial results of this research were presented in this paper. Results show that building simulations can effectively contribute to validate the selection of materials in the production of sustainable wall panels that provide suitable thermal conditions to the users in hot and humid climate.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Portland versus alkali-activated cement wall panels containing mine tailing as aggregate: one-story house thermal performance simulation in a Brazilian and Portuguese hot and humid climate

et al. 2019

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“…[ 71,145,146] Overall, geopolymer concrete (geocement concrete) significantly surpasses Portland cement concrete in several key aspects, underscoring its suitability for pavement applications. With its markedly superior mechanical properties, including higher compressive and flexural strengths and enhanced fracture toughness, geopolymer concrete is particularly adept at handling the high-load demands typical in pavement construction.…”

Section: Thermal Resistance Insulation and Conductivitymentioning

confidence: 99%

Geopolymer Cement in Pavement Applications: Bridging Sustainability and Performance

Ikotun,

Aderinto,

Madirisha

et al. 2024

Sustainability

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Sustainability and the quest for a more robust construction material cannot be divorced from each other. While Portland cement has revolutionized the construction sector, its environmental toll, particularly in greenhouse gas emissions and global warming, cannot be ignored. Addressing this dilemma requires embracing alternatives like geopolymer cement/geopolymer binder (GPC/GPB). Over the last few decades, considerable strides have been achieved in advancing GPC as a sustainable construction material, including its utilization in pavement construction. Despite these advances, gaps still exist in GPC optimal potential in pavement construction, as most studies have concentrated on specific attributes rather than on a comprehensive evaluation. To bridge this gap, this review adopts a novel, holistic approach by integrating environmental impacts with performance metrics. To set the stage, this review first delves into the geopolymer concept from a chemistry perspective, providing an essential broad overview for exploring GPC’s innovations and implications in pavement applications. The findings reveal that GPC not only significantly reduces greenhouse gas emissions and energy consumption compared to Portland cement but also enhances pavement performance. Further, GPC concrete pavement exhibits superior mechanical, durability, and thermal properties to ensure its long-term performance in pavement applications. However, challenges to GPC utilization as a pavement material include the variability of raw materials, the need for suitable hardeners, the lack of standardized codes and procedures, cost competitiveness, and limited field data. Despite these challenges, the process of geopolymerization presents GPC as a sustainable material for pavement construction, aligning with Sustainable Development Goals (SDGs) 3, 9, 11, and 12.

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“…This reagent is an aqueous solution of silicate containing silica and alkali metal, with a SiO 2 :M 2 O molar ratio greater than 1.65, where M is an alkali metal, either sodium (Na) or potassium (K) [32]. Dense geopolymers are durable (with compressive strength up to 80 MPa), while thermal conductivity (λ) is as high as 0.75 W/ (m × K) [36][37][38]. An alternative way is to use porous geopolymers with a density of <500 kg/m 3 .…”

Section: Alternative Binder Materials Proposed For Bio-compositesmentioning

confidence: 99%

Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment

et al. 2020

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To decrease the environmental impact of the construction industry, energy-efficient insulation materials with low embodied production energy are needed. Lime-hemp concrete is traditionally recognized as such a material; however, the drawbacks of this type of material are associated with low strength gain, high initial moisture content, and limited application. Therefore, this review article discusses alternatives to lime-hemp concrete that would achieve similar thermal properties with an equivalent or lower environmental impact. Binders such as gypsum, geopolymers, and starch are proposed as alternatives, due to their performance and low environmental impact, and available research is summarized and discussed in this paper. The summarized results show that low-density thermal insulation bio-composites with a density of 200–400 kg/m3 and thermal conductivity (λ) of 0.06–0.09 W/(m × K) can be obtained with gypsum and geopolymer binders. However, by using a starch binder it is possible to produce ecological building materials with a density of approximately 100 kg/m3 and thermal conductivity (λ) as low as 0.04 W/(m × K). In addition, a preliminary life cycle assessment was carried out to evaluate the environmental impact of reviewed bio-composites. The results indicate that such bio-composites have a low environmental impact, similar to lime-hemp concrete.

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Comparison of the Thermal Characteristics of Portland Cement and Geopolymer Cement Concrete Mixes

Cited by 30 publications

References 15 publications

Portland versus alkali-activated cement wall panels containing mine tailing as aggregate: one-story house thermal performance simulation in a Brazilian and Portuguese hot and humid climate

Portland versus alkali-activated cement wall panels containing mine tailing as aggregate: one-story house thermal performance simulation in a Brazilian and Portuguese hot and humid climate

Geopolymer Cement in Pavement Applications: Bridging Sustainability and Performance

Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment

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